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1  /*
2   * Copyright (C) 2006 The Android Open Source Project
3   *
4   * Licensed under the Apache License, Version 2.0 (the "License");
5   * you may not use this file except in compliance with the License.
6   * You may obtain a copy of the License at
7   *
8   *      http://www.apache.org/licenses/LICENSE-2.0
9   *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package android.view;
18  
19  import android.content.ClipData;
20  import android.content.Context;
21  import android.content.res.Configuration;
22  import android.content.res.Resources;
23  import android.content.res.TypedArray;
24  import android.graphics.Bitmap;
25  import android.graphics.Camera;
26  import android.graphics.Canvas;
27  import android.graphics.Interpolator;
28  import android.graphics.LinearGradient;
29  import android.graphics.Matrix;
30  import android.graphics.Paint;
31  import android.graphics.PixelFormat;
32  import android.graphics.Point;
33  import android.graphics.PorterDuff;
34  import android.graphics.PorterDuffXfermode;
35  import android.graphics.Rect;
36  import android.graphics.RectF;
37  import android.graphics.Region;
38  import android.graphics.Shader;
39  import android.graphics.drawable.ColorDrawable;
40  import android.graphics.drawable.Drawable;
41  import android.os.Handler;
42  import android.os.IBinder;
43  import android.os.Message;
44  import android.os.Parcel;
45  import android.os.Parcelable;
46  import android.os.RemoteException;
47  import android.os.SystemClock;
48  import android.text.TextUtils;
49  import android.util.AttributeSet;
50  import android.util.FloatProperty;
51  import android.util.LocaleUtil;
52  import android.util.Log;
53  import android.util.Pool;
54  import android.util.Poolable;
55  import android.util.PoolableManager;
56  import android.util.Pools;
57  import android.util.Property;
58  import android.util.SparseArray;
59  import android.util.TypedValue;
60  import android.view.ContextMenu.ContextMenuInfo;
61  import android.view.accessibility.AccessibilityEvent;
62  import android.view.accessibility.AccessibilityEventSource;
63  import android.view.accessibility.AccessibilityManager;
64  import android.view.accessibility.AccessibilityNodeInfo;
65  import android.view.animation.Animation;
66  import android.view.animation.AnimationUtils;
67  import android.view.inputmethod.EditorInfo;
68  import android.view.inputmethod.InputConnection;
69  import android.view.inputmethod.InputMethodManager;
70  import android.widget.ScrollBarDrawable;
71  
72  import static android.os.Build.VERSION_CODES.*;
73  
74  import com.android.internal.R;
75  import com.android.internal.util.Predicate;
76  import com.android.internal.view.menu.MenuBuilder;
77  
78  import java.lang.ref.WeakReference;
79  import java.lang.reflect.InvocationTargetException;
80  import java.lang.reflect.Method;
81  import java.util.ArrayList;
82  import java.util.Arrays;
83  import java.util.Locale;
84  import java.util.concurrent.CopyOnWriteArrayList;
85  
86  /**
87   * <p>
88   * This class represents the basic building block for user interface components. A View
89   * occupies a rectangular area on the screen and is responsible for drawing and
90   * event handling. View is the base class for <em>widgets</em>, which are
91   * used to create interactive UI components (buttons, text fields, etc.). The
92   * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which
93   * are invisible containers that hold other Views (or other ViewGroups) and define
94   * their layout properties.
95   * </p>
96   *
97   * <div class="special reference">
98   * <h3>Developer Guides</h3>
99   * <p>For information about using this class to develop your application's user interface,
100   * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide.
101   * </div>
102   *
103   * <a name="Using"></a>
104   * <h3>Using Views</h3>
105   * <p>
106   * All of the views in a window are arranged in a single tree. You can add views
107   * either from code or by specifying a tree of views in one or more XML layout
108   * files. There are many specialized subclasses of views that act as controls or
109   * are capable of displaying text, images, or other content.
110   * </p>
111   * <p>
112   * Once you have created a tree of views, there are typically a few types of
113   * common operations you may wish to perform:
114   * <ul>
115   * <li><strong>Set properties:</strong> for example setting the text of a
116   * {@link android.widget.TextView}. The available properties and the methods
117   * that set them will vary among the different subclasses of views. Note that
118   * properties that are known at build time can be set in the XML layout
119   * files.</li>
120   * <li><strong>Set focus:</strong> The framework will handled moving focus in
121   * response to user input. To force focus to a specific view, call
122   * {@link #requestFocus}.</li>
123   * <li><strong>Set up listeners:</strong> Views allow clients to set listeners
124   * that will be notified when something interesting happens to the view. For
125   * example, all views will let you set a listener to be notified when the view
126   * gains or loses focus. You can register such a listener using
127   * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}.
128   * Other view subclasses offer more specialized listeners. For example, a Button
129   * exposes a listener to notify clients when the button is clicked.</li>
130   * <li><strong>Set visibility:</strong> You can hide or show views using
131   * {@link #setVisibility(int)}.</li>
132   * </ul>
133   * </p>
134   * <p><em>
135   * Note: The Android framework is responsible for measuring, laying out and
136   * drawing views. You should not call methods that perform these actions on
137   * views yourself unless you are actually implementing a
138   * {@link android.view.ViewGroup}.
139   * </em></p>
140   *
141   * <a name="Lifecycle"></a>
142   * <h3>Implementing a Custom View</h3>
143   *
144   * <p>
145   * To implement a custom view, you will usually begin by providing overrides for
146   * some of the standard methods that the framework calls on all views. You do
147   * not need to override all of these methods. In fact, you can start by just
148   * overriding {@link #onDraw(android.graphics.Canvas)}.
149   * <table border="2" width="85%" align="center" cellpadding="5">
150   *     <thead>
151   *         <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr>
152   *     </thead>
153   *
154   *     <tbody>
155   *     <tr>
156   *         <td rowspan="2">Creation</td>
157   *         <td>Constructors</td>
158   *         <td>There is a form of the constructor that are called when the view
159   *         is created from code and a form that is called when the view is
160   *         inflated from a layout file. The second form should parse and apply
161   *         any attributes defined in the layout file.
162   *         </td>
163   *     </tr>
164   *     <tr>
165   *         <td><code>{@link #onFinishInflate()}</code></td>
166   *         <td>Called after a view and all of its children has been inflated
167   *         from XML.</td>
168   *     </tr>
169   *
170   *     <tr>
171   *         <td rowspan="3">Layout</td>
172   *         <td><code>{@link #onMeasure(int, int)}</code></td>
173   *         <td>Called to determine the size requirements for this view and all
174   *         of its children.
175   *         </td>
176   *     </tr>
177   *     <tr>
178   *         <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td>
179   *         <td>Called when this view should assign a size and position to all
180   *         of its children.
181   *         </td>
182   *     </tr>
183   *     <tr>
184   *         <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td>
185   *         <td>Called when the size of this view has changed.
186   *         </td>
187   *     </tr>
188   *
189   *     <tr>
190   *         <td>Drawing</td>
191   *         <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td>
192   *         <td>Called when the view should render its content.
193   *         </td>
194   *     </tr>
195   *
196   *     <tr>
197   *         <td rowspan="4">Event processing</td>
198   *         <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td>
199   *         <td>Called when a new key event occurs.
200   *         </td>
201   *     </tr>
202   *     <tr>
203   *         <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td>
204   *         <td>Called when a key up event occurs.
205   *         </td>
206   *     </tr>
207   *     <tr>
208   *         <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td>
209   *         <td>Called when a trackball motion event occurs.
210   *         </td>
211   *     </tr>
212   *     <tr>
213   *         <td><code>{@link #onTouchEvent(MotionEvent)}</code></td>
214   *         <td>Called when a touch screen motion event occurs.
215   *         </td>
216   *     </tr>
217   *
218   *     <tr>
219   *         <td rowspan="2">Focus</td>
220   *         <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td>
221   *         <td>Called when the view gains or loses focus.
222   *         </td>
223   *     </tr>
224   *
225   *     <tr>
226   *         <td><code>{@link #onWindowFocusChanged(boolean)}</code></td>
227   *         <td>Called when the window containing the view gains or loses focus.
228   *         </td>
229   *     </tr>
230   *
231   *     <tr>
232   *         <td rowspan="3">Attaching</td>
233   *         <td><code>{@link #onAttachedToWindow()}</code></td>
234   *         <td>Called when the view is attached to a window.
235   *         </td>
236   *     </tr>
237   *
238   *     <tr>
239   *         <td><code>{@link #onDetachedFromWindow}</code></td>
240   *         <td>Called when the view is detached from its window.
241   *         </td>
242   *     </tr>
243   *
244   *     <tr>
245   *         <td><code>{@link #onWindowVisibilityChanged(int)}</code></td>
246   *         <td>Called when the visibility of the window containing the view
247   *         has changed.
248   *         </td>
249   *     </tr>
250   *     </tbody>
251   *
252   * </table>
253   * </p>
254   *
255   * <a name="IDs"></a>
256   * <h3>IDs</h3>
257   * Views may have an integer id associated with them. These ids are typically
258   * assigned in the layout XML files, and are used to find specific views within
259   * the view tree. A common pattern is to:
260   * <ul>
261   * <li>Define a Button in the layout file and assign it a unique ID.
262   * <pre>
263   * &lt;Button
264   *     android:id="@+id/my_button"
265   *     android:layout_width="wrap_content"
266   *     android:layout_height="wrap_content"
267   *     android:text="@string/my_button_text"/&gt;
268   * </pre></li>
269   * <li>From the onCreate method of an Activity, find the Button
270   * <pre class="prettyprint">
271   *      Button myButton = (Button) findViewById(R.id.my_button);
272   * </pre></li>
273   * </ul>
274   * <p>
275   * View IDs need not be unique throughout the tree, but it is good practice to
276   * ensure that they are at least unique within the part of the tree you are
277   * searching.
278   * </p>
279   *
280   * <a name="Position"></a>
281   * <h3>Position</h3>
282   * <p>
283   * The geometry of a view is that of a rectangle. A view has a location,
284   * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and
285   * two dimensions, expressed as a width and a height. The unit for location
286   * and dimensions is the pixel.
287   * </p>
288   *
289   * <p>
290   * It is possible to retrieve the location of a view by invoking the methods
291   * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X,
292   * coordinate of the rectangle representing the view. The latter returns the
293   * top, or Y, coordinate of the rectangle representing the view. These methods
294   * both return the location of the view relative to its parent. For instance,
295   * when getLeft() returns 20, that means the view is located 20 pixels to the
296   * right of the left edge of its direct parent.
297   * </p>
298   *
299   * <p>
300   * In addition, several convenience methods are offered to avoid unnecessary
301   * computations, namely {@link #getRight()} and {@link #getBottom()}.
302   * These methods return the coordinates of the right and bottom edges of the
303   * rectangle representing the view. For instance, calling {@link #getRight()}
304   * is similar to the following computation: <code>getLeft() + getWidth()</code>
305   * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.)
306   * </p>
307   *
308   * <a name="SizePaddingMargins"></a>
309   * <h3>Size, padding and margins</h3>
310   * <p>
311   * The size of a view is expressed with a width and a height. A view actually
312   * possess two pairs of width and height values.
313   * </p>
314   *
315   * <p>
316   * The first pair is known as <em>measured width</em> and
317   * <em>measured height</em>. These dimensions define how big a view wants to be
318   * within its parent (see <a href="#Layout">Layout</a> for more details.) The
319   * measured dimensions can be obtained by calling {@link #getMeasuredWidth()}
320   * and {@link #getMeasuredHeight()}.
321   * </p>
322   *
323   * <p>
324   * The second pair is simply known as <em>width</em> and <em>height</em>, or
325   * sometimes <em>drawing width</em> and <em>drawing height</em>. These
326   * dimensions define the actual size of the view on screen, at drawing time and
327   * after layout. These values may, but do not have to, be different from the
328   * measured width and height. The width and height can be obtained by calling
329   * {@link #getWidth()} and {@link #getHeight()}.
330   * </p>
331   *
332   * <p>
333   * To measure its dimensions, a view takes into account its padding. The padding
334   * is expressed in pixels for the left, top, right and bottom parts of the view.
335   * Padding can be used to offset the content of the view by a specific amount of
336   * pixels. For instance, a left padding of 2 will push the view's content by
337   * 2 pixels to the right of the left edge. Padding can be set using the
338   * {@link #setPadding(int, int, int, int)} method and queried by calling
339   * {@link #getPaddingLeft()}, {@link #getPaddingTop()},
340   * {@link #getPaddingRight()}, {@link #getPaddingBottom()}.
341   * </p>
342   *
343   * <p>
344   * Even though a view can define a padding, it does not provide any support for
345   * margins. However, view groups provide such a support. Refer to
346   * {@link android.view.ViewGroup} and
347   * {@link android.view.ViewGroup.MarginLayoutParams} for further information.
348   * </p>
349   *
350   * <a name="Layout"></a>
351   * <h3>Layout</h3>
352   * <p>
353   * Layout is a two pass process: a measure pass and a layout pass. The measuring
354   * pass is implemented in {@link #measure(int, int)} and is a top-down traversal
355   * of the view tree. Each view pushes dimension specifications down the tree
356   * during the recursion. At the end of the measure pass, every view has stored
357   * its measurements. The second pass happens in
358   * {@link #layout(int,int,int,int)} and is also top-down. During
359   * this pass each parent is responsible for positioning all of its children
360   * using the sizes computed in the measure pass.
361   * </p>
362   *
363   * <p>
364   * When a view's measure() method returns, its {@link #getMeasuredWidth()} and
365   * {@link #getMeasuredHeight()} values must be set, along with those for all of
366   * that view's descendants. A view's measured width and measured height values
367   * must respect the constraints imposed by the view's parents. This guarantees
368   * that at the end of the measure pass, all parents accept all of their
369   * children's measurements. A parent view may call measure() more than once on
370   * its children. For example, the parent may measure each child once with
371   * unspecified dimensions to find out how big they want to be, then call
372   * measure() on them again with actual numbers if the sum of all the children's
373   * unconstrained sizes is too big or too small.
374   * </p>
375   *
376   * <p>
377   * The measure pass uses two classes to communicate dimensions. The
378   * {@link MeasureSpec} class is used by views to tell their parents how they
379   * want to be measured and positioned. The base LayoutParams class just
380   * describes how big the view wants to be for both width and height. For each
381   * dimension, it can specify one of:
382   * <ul>
383   * <li> an exact number
384   * <li>MATCH_PARENT, which means the view wants to be as big as its parent
385   * (minus padding)
386   * <li> WRAP_CONTENT, which means that the view wants to be just big enough to
387   * enclose its content (plus padding).
388   * </ul>
389   * There are subclasses of LayoutParams for different subclasses of ViewGroup.
390   * For example, AbsoluteLayout has its own subclass of LayoutParams which adds
391   * an X and Y value.
392   * </p>
393   *
394   * <p>
395   * MeasureSpecs are used to push requirements down the tree from parent to
396   * child. A MeasureSpec can be in one of three modes:
397   * <ul>
398   * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension
399   * of a child view. For example, a LinearLayout may call measure() on its child
400   * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how
401   * tall the child view wants to be given a width of 240 pixels.
402   * <li>EXACTLY: This is used by the parent to impose an exact size on the
403   * child. The child must use this size, and guarantee that all of its
404   * descendants will fit within this size.
405   * <li>AT_MOST: This is used by the parent to impose a maximum size on the
406   * child. The child must gurantee that it and all of its descendants will fit
407   * within this size.
408   * </ul>
409   * </p>
410   *
411   * <p>
412   * To intiate a layout, call {@link #requestLayout}. This method is typically
413   * called by a view on itself when it believes that is can no longer fit within
414   * its current bounds.
415   * </p>
416   *
417   * <a name="Drawing"></a>
418   * <h3>Drawing</h3>
419   * <p>
420   * Drawing is handled by walking the tree and rendering each view that
421   * intersects the invalid region. Because the tree is traversed in-order,
422   * this means that parents will draw before (i.e., behind) their children, with
423   * siblings drawn in the order they appear in the tree.
424   * If you set a background drawable for a View, then the View will draw it for you
425   * before calling back to its <code>onDraw()</code> method.
426   * </p>
427   *
428   * <p>
429   * Note that the framework will not draw views that are not in the invalid region.
430   * </p>
431   *
432   * <p>
433   * To force a view to draw, call {@link #invalidate()}.
434   * </p>
435   *
436   * <a name="EventHandlingThreading"></a>
437   * <h3>Event Handling and Threading</h3>
438   * <p>
439   * The basic cycle of a view is as follows:
440   * <ol>
441   * <li>An event comes in and is dispatched to the appropriate view. The view
442   * handles the event and notifies any listeners.</li>
443   * <li>If in the course of processing the event, the view's bounds may need
444   * to be changed, the view will call {@link #requestLayout()}.</li>
445   * <li>Similarly, if in the course of processing the event the view's appearance
446   * may need to be changed, the view will call {@link #invalidate()}.</li>
447   * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called,
448   * the framework will take care of measuring, laying out, and drawing the tree
449   * as appropriate.</li>
450   * </ol>
451   * </p>
452   *
453   * <p><em>Note: The entire view tree is single threaded. You must always be on
454   * the UI thread when calling any method on any view.</em>
455   * If you are doing work on other threads and want to update the state of a view
456   * from that thread, you should use a {@link Handler}.
457   * </p>
458   *
459   * <a name="FocusHandling"></a>
460   * <h3>Focus Handling</h3>
461   * <p>
462   * The framework will handle routine focus movement in response to user input.
463   * This includes changing the focus as views are removed or hidden, or as new
464   * views become available. Views indicate their willingness to take focus
465   * through the {@link #isFocusable} method. To change whether a view can take
466   * focus, call {@link #setFocusable(boolean)}.  When in touch mode (see notes below)
467   * views indicate whether they still would like focus via {@link #isFocusableInTouchMode}
468   * and can change this via {@link #setFocusableInTouchMode(boolean)}.
469   * </p>
470   * <p>
471   * Focus movement is based on an algorithm which finds the nearest neighbor in a
472   * given direction. In rare cases, the default algorithm may not match the
473   * intended behavior of the developer. In these situations, you can provide
474   * explicit overrides by using these XML attributes in the layout file:
475   * <pre>
476   * nextFocusDown
477   * nextFocusLeft
478   * nextFocusRight
479   * nextFocusUp
480   * </pre>
481   * </p>
482   *
483   *
484   * <p>
485   * To get a particular view to take focus, call {@link #requestFocus()}.
486   * </p>
487   *
488   * <a name="TouchMode"></a>
489   * <h3>Touch Mode</h3>
490   * <p>
491   * When a user is navigating a user interface via directional keys such as a D-pad, it is
492   * necessary to give focus to actionable items such as buttons so the user can see
493   * what will take input.  If the device has touch capabilities, however, and the user
494   * begins interacting with the interface by touching it, it is no longer necessary to
495   * always highlight, or give focus to, a particular view.  This motivates a mode
496   * for interaction named 'touch mode'.
497   * </p>
498   * <p>
499   * For a touch capable device, once the user touches the screen, the device
500   * will enter touch mode.  From this point onward, only views for which
501   * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets.
502   * Other views that are touchable, like buttons, will not take focus when touched; they will
503   * only fire the on click listeners.
504   * </p>
505   * <p>
506   * Any time a user hits a directional key, such as a D-pad direction, the view device will
507   * exit touch mode, and find a view to take focus, so that the user may resume interacting
508   * with the user interface without touching the screen again.
509   * </p>
510   * <p>
511   * The touch mode state is maintained across {@link android.app.Activity}s.  Call
512   * {@link #isInTouchMode} to see whether the device is currently in touch mode.
513   * </p>
514   *
515   * <a name="Scrolling"></a>
516   * <h3>Scrolling</h3>
517   * <p>
518   * The framework provides basic support for views that wish to internally
519   * scroll their content. This includes keeping track of the X and Y scroll
520   * offset as well as mechanisms for drawing scrollbars. See
521   * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and
522   * {@link #awakenScrollBars()} for more details.
523   * </p>
524   *
525   * <a name="Tags"></a>
526   * <h3>Tags</h3>
527   * <p>
528   * Unlike IDs, tags are not used to identify views. Tags are essentially an
529   * extra piece of information that can be associated with a view. They are most
530   * often used as a convenience to store data related to views in the views
531   * themselves rather than by putting them in a separate structure.
532   * </p>
533   *
534   * <a name="Animation"></a>
535   * <h3>Animation</h3>
536   * <p>
537   * You can attach an {@link Animation} object to a view using
538   * {@link #setAnimation(Animation)} or
539   * {@link #startAnimation(Animation)}. The animation can alter the scale,
540   * rotation, translation and alpha of a view over time. If the animation is
541   * attached to a view that has children, the animation will affect the entire
542   * subtree rooted by that node. When an animation is started, the framework will
543   * take care of redrawing the appropriate views until the animation completes.
544   * </p>
545   * <p>
546   * Starting with Android 3.0, the preferred way of animating views is to use the
547   * {@link android.animation} package APIs.
548   * </p>
549   *
550   * <a name="Security"></a>
551   * <h3>Security</h3>
552   * <p>
553   * Sometimes it is essential that an application be able to verify that an action
554   * is being performed with the full knowledge and consent of the user, such as
555   * granting a permission request, making a purchase or clicking on an advertisement.
556   * Unfortunately, a malicious application could try to spoof the user into
557   * performing these actions, unaware, by concealing the intended purpose of the view.
558   * As a remedy, the framework offers a touch filtering mechanism that can be used to
559   * improve the security of views that provide access to sensitive functionality.
560   * </p><p>
561   * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the
562   * android:filterTouchesWhenObscured layout attribute to true.  When enabled, the framework
563   * will discard touches that are received whenever the view's window is obscured by
564   * another visible window.  As a result, the view will not receive touches whenever a
565   * toast, dialog or other window appears above the view's window.
566   * </p><p>
567   * For more fine-grained control over security, consider overriding the
568   * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own
569   * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}.
570   * </p>
571   *
572   * @attr ref android.R.styleable#View_alpha
573   * @attr ref android.R.styleable#View_background
574   * @attr ref android.R.styleable#View_clickable
575   * @attr ref android.R.styleable#View_contentDescription
576   * @attr ref android.R.styleable#View_drawingCacheQuality
577   * @attr ref android.R.styleable#View_duplicateParentState
578   * @attr ref android.R.styleable#View_id
579   * @attr ref android.R.styleable#View_requiresFadingEdge
580   * @attr ref android.R.styleable#View_fadingEdgeLength
581   * @attr ref android.R.styleable#View_filterTouchesWhenObscured
582   * @attr ref android.R.styleable#View_fitsSystemWindows
583   * @attr ref android.R.styleable#View_isScrollContainer
584   * @attr ref android.R.styleable#View_focusable
585   * @attr ref android.R.styleable#View_focusableInTouchMode
586   * @attr ref android.R.styleable#View_hapticFeedbackEnabled
587   * @attr ref android.R.styleable#View_keepScreenOn
588   * @attr ref android.R.styleable#View_layerType
589   * @attr ref android.R.styleable#View_longClickable
590   * @attr ref android.R.styleable#View_minHeight
591   * @attr ref android.R.styleable#View_minWidth
592   * @attr ref android.R.styleable#View_nextFocusDown
593   * @attr ref android.R.styleable#View_nextFocusLeft
594   * @attr ref android.R.styleable#View_nextFocusRight
595   * @attr ref android.R.styleable#View_nextFocusUp
596   * @attr ref android.R.styleable#View_onClick
597   * @attr ref android.R.styleable#View_padding
598   * @attr ref android.R.styleable#View_paddingBottom
599   * @attr ref android.R.styleable#View_paddingLeft
600   * @attr ref android.R.styleable#View_paddingRight
601   * @attr ref android.R.styleable#View_paddingTop
602   * @attr ref android.R.styleable#View_saveEnabled
603   * @attr ref android.R.styleable#View_rotation
604   * @attr ref android.R.styleable#View_rotationX
605   * @attr ref android.R.styleable#View_rotationY
606   * @attr ref android.R.styleable#View_scaleX
607   * @attr ref android.R.styleable#View_scaleY
608   * @attr ref android.R.styleable#View_scrollX
609   * @attr ref android.R.styleable#View_scrollY
610   * @attr ref android.R.styleable#View_scrollbarSize
611   * @attr ref android.R.styleable#View_scrollbarStyle
612   * @attr ref android.R.styleable#View_scrollbars
613   * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade
614   * @attr ref android.R.styleable#View_scrollbarFadeDuration
615   * @attr ref android.R.styleable#View_scrollbarTrackHorizontal
616   * @attr ref android.R.styleable#View_scrollbarThumbHorizontal
617   * @attr ref android.R.styleable#View_scrollbarThumbVertical
618   * @attr ref android.R.styleable#View_scrollbarTrackVertical
619   * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack
620   * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack
621   * @attr ref android.R.styleable#View_soundEffectsEnabled
622   * @attr ref android.R.styleable#View_tag
623   * @attr ref android.R.styleable#View_transformPivotX
624   * @attr ref android.R.styleable#View_transformPivotY
625   * @attr ref android.R.styleable#View_translationX
626   * @attr ref android.R.styleable#View_translationY
627   * @attr ref android.R.styleable#View_visibility
628   *
629   * @see android.view.ViewGroup
630   */
631  public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback,
632          AccessibilityEventSource {
633      private static final boolean DBG = false;
634  
635      /**
636       * The logging tag used by this class with android.util.Log.
637       */
638      protected static final String VIEW_LOG_TAG = "View";
639  
640      /**
641       * Used to mark a View that has no ID.
642       */
643      public static final int NO_ID = -1;
644  
645      /**
646       * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when
647       * calling setFlags.
648       */
649      private static final int NOT_FOCUSABLE = 0x00000000;
650  
651      /**
652       * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling
653       * setFlags.
654       */
655      private static final int FOCUSABLE = 0x00000001;
656  
657      /**
658       * Mask for use with setFlags indicating bits used for focus.
659       */
660      private static final int FOCUSABLE_MASK = 0x00000001;
661  
662      /**
663       * This view will adjust its padding to fit sytem windows (e.g. status bar)
664       */
665      private static final int FITS_SYSTEM_WINDOWS = 0x00000002;
666  
667      /**
668       * This view is visible.
669       * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
670       * android:visibility}.
671       */
672      public static final int VISIBLE = 0x00000000;
673  
674      /**
675       * This view is invisible, but it still takes up space for layout purposes.
676       * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
677       * android:visibility}.
678       */
679      public static final int INVISIBLE = 0x00000004;
680  
681      /**
682       * This view is invisible, and it doesn't take any space for layout
683       * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
684       * android:visibility}.
685       */
686      public static final int GONE = 0x00000008;
687  
688      /**
689       * Mask for use with setFlags indicating bits used for visibility.
690       * {@hide}
691       */
692      static final int VISIBILITY_MASK = 0x0000000C;
693  
694      private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE};
695  
696      /**
697       * This view is enabled. Intrepretation varies by subclass.
698       * Use with ENABLED_MASK when calling setFlags.
699       * {@hide}
700       */
701      static final int ENABLED = 0x00000000;
702  
703      /**
704       * This view is disabled. Intrepretation varies by subclass.
705       * Use with ENABLED_MASK when calling setFlags.
706       * {@hide}
707       */
708      static final int DISABLED = 0x00000020;
709  
710     /**
711      * Mask for use with setFlags indicating bits used for indicating whether
712      * this view is enabled
713      * {@hide}
714      */
715      static final int ENABLED_MASK = 0x00000020;
716  
717      /**
718       * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be
719       * called and further optimizations will be performed. It is okay to have
720       * this flag set and a background. Use with DRAW_MASK when calling setFlags.
721       * {@hide}
722       */
723      static final int WILL_NOT_DRAW = 0x00000080;
724  
725      /**
726       * Mask for use with setFlags indicating bits used for indicating whether
727       * this view is will draw
728       * {@hide}
729       */
730      static final int DRAW_MASK = 0x00000080;
731  
732      /**
733       * <p>This view doesn't show scrollbars.</p>
734       * {@hide}
735       */
736      static final int SCROLLBARS_NONE = 0x00000000;
737  
738      /**
739       * <p>This view shows horizontal scrollbars.</p>
740       * {@hide}
741       */
742      static final int SCROLLBARS_HORIZONTAL = 0x00000100;
743  
744      /**
745       * <p>This view shows vertical scrollbars.</p>
746       * {@hide}
747       */
748      static final int SCROLLBARS_VERTICAL = 0x00000200;
749  
750      /**
751       * <p>Mask for use with setFlags indicating bits used for indicating which
752       * scrollbars are enabled.</p>
753       * {@hide}
754       */
755      static final int SCROLLBARS_MASK = 0x00000300;
756  
757      /**
758       * Indicates that the view should filter touches when its window is obscured.
759       * Refer to the class comments for more information about this security feature.
760       * {@hide}
761       */
762      static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400;
763  
764      // note flag value 0x00000800 is now available for next flags...
765  
766      /**
767       * <p>This view doesn't show fading edges.</p>
768       * {@hide}
769       */
770      static final int FADING_EDGE_NONE = 0x00000000;
771  
772      /**
773       * <p>This view shows horizontal fading edges.</p>
774       * {@hide}
775       */
776      static final int FADING_EDGE_HORIZONTAL = 0x00001000;
777  
778      /**
779       * <p>This view shows vertical fading edges.</p>
780       * {@hide}
781       */
782      static final int FADING_EDGE_VERTICAL = 0x00002000;
783  
784      /**
785       * <p>Mask for use with setFlags indicating bits used for indicating which
786       * fading edges are enabled.</p>
787       * {@hide}
788       */
789      static final int FADING_EDGE_MASK = 0x00003000;
790  
791      /**
792       * <p>Indicates this view can be clicked. When clickable, a View reacts
793       * to clicks by notifying the OnClickListener.<p>
794       * {@hide}
795       */
796      static final int CLICKABLE = 0x00004000;
797  
798      /**
799       * <p>Indicates this view is caching its drawing into a bitmap.</p>
800       * {@hide}
801       */
802      static final int DRAWING_CACHE_ENABLED = 0x00008000;
803  
804      /**
805       * <p>Indicates that no icicle should be saved for this view.<p>
806       * {@hide}
807       */
808      static final int SAVE_DISABLED = 0x000010000;
809  
810      /**
811       * <p>Mask for use with setFlags indicating bits used for the saveEnabled
812       * property.</p>
813       * {@hide}
814       */
815      static final int SAVE_DISABLED_MASK = 0x000010000;
816  
817      /**
818       * <p>Indicates that no drawing cache should ever be created for this view.<p>
819       * {@hide}
820       */
821      static final int WILL_NOT_CACHE_DRAWING = 0x000020000;
822  
823      /**
824       * <p>Indicates this view can take / keep focus when int touch mode.</p>
825       * {@hide}
826       */
827      static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000;
828  
829      /**
830       * <p>Enables low quality mode for the drawing cache.</p>
831       */
832      public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000;
833  
834      /**
835       * <p>Enables high quality mode for the drawing cache.</p>
836       */
837      public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000;
838  
839      /**
840       * <p>Enables automatic quality mode for the drawing cache.</p>
841       */
842      public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000;
843  
844      private static final int[] DRAWING_CACHE_QUALITY_FLAGS = {
845              DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH
846      };
847  
848      /**
849       * <p>Mask for use with setFlags indicating bits used for the cache
850       * quality property.</p>
851       * {@hide}
852       */
853      static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000;
854  
855      /**
856       * <p>
857       * Indicates this view can be long clicked. When long clickable, a View
858       * reacts to long clicks by notifying the OnLongClickListener or showing a
859       * context menu.
860       * </p>
861       * {@hide}
862       */
863      static final int LONG_CLICKABLE = 0x00200000;
864  
865      /**
866       * <p>Indicates that this view gets its drawable states from its direct parent
867       * and ignores its original internal states.</p>
868       *
869       * @hide
870       */
871      static final int DUPLICATE_PARENT_STATE = 0x00400000;
872  
873      /**
874       * The scrollbar style to display the scrollbars inside the content area,
875       * without increasing the padding. The scrollbars will be overlaid with
876       * translucency on the view's content.
877       */
878      public static final int SCROLLBARS_INSIDE_OVERLAY = 0;
879  
880      /**
881       * The scrollbar style to display the scrollbars inside the padded area,
882       * increasing the padding of the view. The scrollbars will not overlap the
883       * content area of the view.
884       */
885      public static final int SCROLLBARS_INSIDE_INSET = 0x01000000;
886  
887      /**
888       * The scrollbar style to display the scrollbars at the edge of the view,
889       * without increasing the padding. The scrollbars will be overlaid with
890       * translucency.
891       */
892      public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000;
893  
894      /**
895       * The scrollbar style to display the scrollbars at the edge of the view,
896       * increasing the padding of the view. The scrollbars will only overlap the
897       * background, if any.
898       */
899      public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000;
900  
901      /**
902       * Mask to check if the scrollbar style is overlay or inset.
903       * {@hide}
904       */
905      static final int SCROLLBARS_INSET_MASK = 0x01000000;
906  
907      /**
908       * Mask to check if the scrollbar style is inside or outside.
909       * {@hide}
910       */
911      static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000;
912  
913      /**
914       * Mask for scrollbar style.
915       * {@hide}
916       */
917      static final int SCROLLBARS_STYLE_MASK = 0x03000000;
918  
919      /**
920       * View flag indicating that the screen should remain on while the
921       * window containing this view is visible to the user.  This effectively
922       * takes care of automatically setting the WindowManager's
923       * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}.
924       */
925      public static final int KEEP_SCREEN_ON = 0x04000000;
926  
927      /**
928       * View flag indicating whether this view should have sound effects enabled
929       * for events such as clicking and touching.
930       */
931      public static final int SOUND_EFFECTS_ENABLED = 0x08000000;
932  
933      /**
934       * View flag indicating whether this view should have haptic feedback
935       * enabled for events such as long presses.
936       */
937      public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000;
938  
939      /**
940       * <p>Indicates that the view hierarchy should stop saving state when
941       * it reaches this view.  If state saving is initiated immediately at
942       * the view, it will be allowed.
943       * {@hide}
944       */
945      static final int PARENT_SAVE_DISABLED = 0x20000000;
946  
947      /**
948       * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p>
949       * {@hide}
950       */
951      static final int PARENT_SAVE_DISABLED_MASK = 0x20000000;
952  
953      /**
954       * Horizontal direction of this view is from Left to Right.
955       * Use with {@link #setLayoutDirection}.
956       * {@hide}
957       */
958      public static final int LAYOUT_DIRECTION_LTR = 0x00000000;
959  
960      /**
961       * Horizontal direction of this view is from Right to Left.
962       * Use with {@link #setLayoutDirection}.
963       * {@hide}
964       */
965      public static final int LAYOUT_DIRECTION_RTL = 0x40000000;
966  
967      /**
968       * Horizontal direction of this view is inherited from its parent.
969       * Use with {@link #setLayoutDirection}.
970       * {@hide}
971       */
972      public static final int LAYOUT_DIRECTION_INHERIT = 0x80000000;
973  
974      /**
975       * Horizontal direction of this view is from deduced from the default language
976       * script for the locale. Use with {@link #setLayoutDirection}.
977       * {@hide}
978       */
979      public static final int LAYOUT_DIRECTION_LOCALE = 0xC0000000;
980  
981      /**
982       * Mask for use with setFlags indicating bits used for horizontalDirection.
983       * {@hide}
984       */
985      static final int LAYOUT_DIRECTION_MASK = 0xC0000000;
986  
987      /*
988       * Array of horizontal direction flags for mapping attribute "horizontalDirection" to correct
989       * flag value.
990       * {@hide}
991       */
992      private static final int[] LAYOUT_DIRECTION_FLAGS = {LAYOUT_DIRECTION_LTR,
993          LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE};
994  
995      /**
996       * Default horizontalDirection.
997       * {@hide}
998       */
999      private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT;
1000  
1001      /**
1002       * View flag indicating whether {@link #addFocusables(ArrayList, int, int)}
1003       * should add all focusable Views regardless if they are focusable in touch mode.
1004       */
1005      public static final int FOCUSABLES_ALL = 0x00000000;
1006  
1007      /**
1008       * View flag indicating whether {@link #addFocusables(ArrayList, int, int)}
1009       * should add only Views focusable in touch mode.
1010       */
1011      public static final int FOCUSABLES_TOUCH_MODE = 0x00000001;
1012  
1013      /**
1014       * Use with {@link #focusSearch(int)}. Move focus to the previous selectable
1015       * item.
1016       */
1017      public static final int FOCUS_BACKWARD = 0x00000001;
1018  
1019      /**
1020       * Use with {@link #focusSearch(int)}. Move focus to the next selectable
1021       * item.
1022       */
1023      public static final int FOCUS_FORWARD = 0x00000002;
1024  
1025      /**
1026       * Use with {@link #focusSearch(int)}. Move focus to the left.
1027       */
1028      public static final int FOCUS_LEFT = 0x00000011;
1029  
1030      /**
1031       * Use with {@link #focusSearch(int)}. Move focus up.
1032       */
1033      public static final int FOCUS_UP = 0x00000021;
1034  
1035      /**
1036       * Use with {@link #focusSearch(int)}. Move focus to the right.
1037       */
1038      public static final int FOCUS_RIGHT = 0x00000042;
1039  
1040      /**
1041       * Use with {@link #focusSearch(int)}. Move focus down.
1042       */
1043      public static final int FOCUS_DOWN = 0x00000082;
1044  
1045      /**
1046       * Bits of {@link #getMeasuredWidthAndState()} and
1047       * {@link #getMeasuredWidthAndState()} that provide the actual measured size.
1048       */
1049      public static final int MEASURED_SIZE_MASK = 0x00ffffff;
1050  
1051      /**
1052       * Bits of {@link #getMeasuredWidthAndState()} and
1053       * {@link #getMeasuredWidthAndState()} that provide the additional state bits.
1054       */
1055      public static final int MEASURED_STATE_MASK = 0xff000000;
1056  
1057      /**
1058       * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits
1059       * for functions that combine both width and height into a single int,
1060       * such as {@link #getMeasuredState()} and the childState argument of
1061       * {@link #resolveSizeAndState(int, int, int)}.
1062       */
1063      public static final int MEASURED_HEIGHT_STATE_SHIFT = 16;
1064  
1065      /**
1066       * Bit of {@link #getMeasuredWidthAndState()} and
1067       * {@link #getMeasuredWidthAndState()} that indicates the measured size
1068       * is smaller that the space the view would like to have.
1069       */
1070      public static final int MEASURED_STATE_TOO_SMALL = 0x01000000;
1071  
1072      /**
1073       * Base View state sets
1074       */
1075      // Singles
1076      /**
1077       * Indicates the view has no states set. States are used with
1078       * {@link android.graphics.drawable.Drawable} to change the drawing of the
1079       * view depending on its state.
1080       *
1081       * @see android.graphics.drawable.Drawable
1082       * @see #getDrawableState()
1083       */
1084      protected static final int[] EMPTY_STATE_SET;
1085      /**
1086       * Indicates the view is enabled. States are used with
1087       * {@link android.graphics.drawable.Drawable} to change the drawing of the
1088       * view depending on its state.
1089       *
1090       * @see android.graphics.drawable.Drawable
1091       * @see #getDrawableState()
1092       */
1093      protected static final int[] ENABLED_STATE_SET;
1094      /**
1095       * Indicates the view is focused. States are used with
1096       * {@link android.graphics.drawable.Drawable} to change the drawing of the
1097       * view depending on its state.
1098       *
1099       * @see android.graphics.drawable.Drawable
1100       * @see #getDrawableState()
1101       */
1102      protected static final int[] FOCUSED_STATE_SET;
1103      /**
1104       * Indicates the view is selected. States are used with
1105       * {@link android.graphics.drawable.Drawable} to change the drawing of the
1106       * view depending on its state.
1107       *
1108       * @see android.graphics.drawable.Drawable
1109       * @see #getDrawableState()
1110       */
1111      protected static final int[] SELECTED_STATE_SET;
1112      /**
1113       * Indicates the view is pressed. States are used with
1114       * {@link android.graphics.drawable.Drawable} to change the drawing of the
1115       * view depending on its state.
1116       *
1117       * @see android.graphics.drawable.Drawable
1118       * @see #getDrawableState()
1119       * @hide
1120       */
1121      protected static final int[] PRESSED_STATE_SET;
1122      /**
1123       * Indicates the view's window has focus. States are used with
1124       * {@link android.graphics.drawable.Drawable} to change the drawing of the
1125       * view depending on its state.
1126       *
1127       * @see android.graphics.drawable.Drawable
1128       * @see #getDrawableState()
1129       */
1130      protected static final int[] WINDOW_FOCUSED_STATE_SET;
1131      // Doubles
1132      /**
1133       * Indicates the view is enabled and has the focus.
1134       *
1135       * @see #ENABLED_STATE_SET
1136       * @see #FOCUSED_STATE_SET
1137       */
1138      protected static final int[] ENABLED_FOCUSED_STATE_SET;
1139      /**
1140       * Indicates the view is enabled and selected.
1141       *
1142       * @see #ENABLED_STATE_SET
1143       * @see #SELECTED_STATE_SET
1144       */
1145      protected static final int[] ENABLED_SELECTED_STATE_SET;
1146      /**
1147       * Indicates the view is enabled and that its window has focus.
1148       *
1149       * @see #ENABLED_STATE_SET
1150       * @see #WINDOW_FOCUSED_STATE_SET
1151       */
1152      protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET;
1153      /**
1154       * Indicates the view is focused and selected.
1155       *
1156       * @see #FOCUSED_STATE_SET
1157       * @see #SELECTED_STATE_SET
1158       */
1159      protected static final int[] FOCUSED_SELECTED_STATE_SET;
1160      /**
1161       * Indicates the view has the focus and that its window has the focus.
1162       *
1163       * @see #FOCUSED_STATE_SET
1164       * @see #WINDOW_FOCUSED_STATE_SET
1165       */
1166      protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET;
1167      /**
1168       * Indicates the view is selected and that its window has the focus.
1169       *
1170       * @see #SELECTED_STATE_SET
1171       * @see #WINDOW_FOCUSED_STATE_SET
1172       */
1173      protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET;
1174      // Triples
1175      /**
1176       * Indicates the view is enabled, focused and selected.
1177       *
1178       * @see #ENABLED_STATE_SET
1179       * @see #FOCUSED_STATE_SET
1180       * @see #SELECTED_STATE_SET
1181       */
1182      protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET;
1183      /**
1184       * Indicates the view is enabled, focused and its window has the focus.
1185       *
1186       * @see #ENABLED_STATE_SET
1187       * @see #FOCUSED_STATE_SET
1188       * @see #WINDOW_FOCUSED_STATE_SET
1189       */
1190      protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
1191      /**
1192       * Indicates the view is enabled, selected and its window has the focus.
1193       *
1194       * @see #ENABLED_STATE_SET
1195       * @see #SELECTED_STATE_SET
1196       * @see #WINDOW_FOCUSED_STATE_SET
1197       */
1198      protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET;
1199      /**
1200       * Indicates the view is focused, selected and its window has the focus.
1201       *
1202       * @see #FOCUSED_STATE_SET
1203       * @see #SELECTED_STATE_SET
1204       * @see #WINDOW_FOCUSED_STATE_SET
1205       */
1206      protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
1207      /**
1208       * Indicates the view is enabled, focused, selected and its window
1209       * has the focus.
1210       *
1211       * @see #ENABLED_STATE_SET
1212       * @see #FOCUSED_STATE_SET
1213       * @see #SELECTED_STATE_SET
1214       * @see #WINDOW_FOCUSED_STATE_SET
1215       */
1216      protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
1217      /**
1218       * Indicates the view is pressed and its window has the focus.
1219       *
1220       * @see #PRESSED_STATE_SET
1221       * @see #WINDOW_FOCUSED_STATE_SET
1222       */
1223      protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET;
1224      /**
1225       * Indicates the view is pressed and selected.
1226       *
1227       * @see #PRESSED_STATE_SET
1228       * @see #SELECTED_STATE_SET
1229       */
1230      protected static final int[] PRESSED_SELECTED_STATE_SET;
1231      /**
1232       * Indicates the view is pressed, selected and its window has the focus.
1233       *
1234       * @see #PRESSED_STATE_SET
1235       * @see #SELECTED_STATE_SET
1236       * @see #WINDOW_FOCUSED_STATE_SET
1237       */
1238      protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
1239      /**
1240       * Indicates the view is pressed and focused.
1241       *
1242       * @see #PRESSED_STATE_SET
1243       * @see #FOCUSED_STATE_SET
1244       */
1245      protected static final int[] PRESSED_FOCUSED_STATE_SET;
1246      /**
1247       * Indicates the view is pressed, focused and its window has the focus.
1248       *
1249       * @see #PRESSED_STATE_SET
1250       * @see #FOCUSED_STATE_SET
1251       * @see #WINDOW_FOCUSED_STATE_SET
1252       */
1253      protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
1254      /**
1255       * Indicates the view is pressed, focused and selected.
1256       *
1257       * @see #PRESSED_STATE_SET
1258       * @see #SELECTED_STATE_SET
1259       * @see #FOCUSED_STATE_SET
1260       */
1261      protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET;
1262      /**
1263       * Indicates the view is pressed, focused, selected and its window has the focus.
1264       *
1265       * @see #PRESSED_STATE_SET
1266       * @see #FOCUSED_STATE_SET
1267       * @see #SELECTED_STATE_SET
1268       * @see #WINDOW_FOCUSED_STATE_SET
1269       */
1270      protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
1271      /**
1272       * Indicates the view is pressed and enabled.
1273       *
1274       * @see #PRESSED_STATE_SET
1275       * @see #ENABLED_STATE_SET
1276       */
1277      protected static final int[] PRESSED_ENABLED_STATE_SET;
1278      /**
1279       * Indicates the view is pressed, enabled and its window has the focus.
1280       *
1281       * @see #PRESSED_STATE_SET
1282       * @see #ENABLED_STATE_SET
1283       * @see #WINDOW_FOCUSED_STATE_SET
1284       */
1285      protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET;
1286      /**
1287       * Indicates the view is pressed, enabled and selected.
1288       *
1289       * @see #PRESSED_STATE_SET
1290       * @see #ENABLED_STATE_SET
1291       * @see #SELECTED_STATE_SET
1292       */
1293      protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET;
1294      /**
1295       * Indicates the view is pressed, enabled, selected and its window has the
1296       * focus.
1297       *
1298       * @see #PRESSED_STATE_SET
1299       * @see #ENABLED_STATE_SET
1300       * @see #SELECTED_STATE_SET
1301       * @see #WINDOW_FOCUSED_STATE_SET
1302       */
1303      protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET;
1304      /**
1305       * Indicates the view is pressed, enabled and focused.
1306       *
1307       * @see #PRESSED_STATE_SET
1308       * @see #ENABLED_STATE_SET
1309       * @see #FOCUSED_STATE_SET
1310       */
1311      protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET;
1312      /**
1313       * Indicates the view is pressed, enabled, focused and its window has the
1314       * focus.
1315       *
1316       * @see #PRESSED_STATE_SET
1317       * @see #ENABLED_STATE_SET
1318       * @see #FOCUSED_STATE_SET
1319       * @see #WINDOW_FOCUSED_STATE_SET
1320       */
1321      protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
1322      /**
1323       * Indicates the view is pressed, enabled, focused and selected.
1324       *
1325       * @see #PRESSED_STATE_SET
1326       * @see #ENABLED_STATE_SET
1327       * @see #SELECTED_STATE_SET
1328       * @see #FOCUSED_STATE_SET
1329       */
1330      protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET;
1331      /**
1332       * Indicates the view is pressed, enabled, focused, selected and its window
1333       * has the focus.
1334       *
1335       * @see #PRESSED_STATE_SET
1336       * @see #ENABLED_STATE_SET
1337       * @see #SELECTED_STATE_SET
1338       * @see #FOCUSED_STATE_SET
1339       * @see #WINDOW_FOCUSED_STATE_SET
1340       */
1341      protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
1342  
1343      /**
1344       * The order here is very important to {@link #getDrawableState()}
1345       */
1346      private static final int[][] VIEW_STATE_SETS;
1347  
1348      static final int VIEW_STATE_WINDOW_FOCUSED = 1;
1349      static final int VIEW_STATE_SELECTED = 1 << 1;
1350      static final int VIEW_STATE_FOCUSED = 1 << 2;
1351      static final int VIEW_STATE_ENABLED = 1 << 3;
1352      static final int VIEW_STATE_PRESSED = 1 << 4;
1353      static final int VIEW_STATE_ACTIVATED = 1 << 5;
1354      static final int VIEW_STATE_ACCELERATED = 1 << 6;
1355      static final int VIEW_STATE_HOVERED = 1 << 7;
1356      static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8;
1357      static final int VIEW_STATE_DRAG_HOVERED = 1 << 9;
1358  
1359      static final int[] VIEW_STATE_IDS = new int[] {
1360          R.attr.state_window_focused,    VIEW_STATE_WINDOW_FOCUSED,
1361          R.attr.state_selected,          VIEW_STATE_SELECTED,
1362          R.attr.state_focused,           VIEW_STATE_FOCUSED,
1363          R.attr.state_enabled,           VIEW_STATE_ENABLED,
1364          R.attr.state_pressed,           VIEW_STATE_PRESSED,
1365          R.attr.state_activated,         VIEW_STATE_ACTIVATED,
1366          R.attr.state_accelerated,       VIEW_STATE_ACCELERATED,
1367          R.attr.state_hovered,           VIEW_STATE_HOVERED,
1368          R.attr.state_drag_can_accept,   VIEW_STATE_DRAG_CAN_ACCEPT,
1369          R.attr.state_drag_hovered,      VIEW_STATE_DRAG_HOVERED,
1370      };
1371  
1372      static {
1373          if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) {
1374              throw new IllegalStateException(
1375                      "VIEW_STATE_IDs array length does not match ViewDrawableStates style array");
1376          }
1377          int[] orderedIds = new int[VIEW_STATE_IDS.length];
1378          for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) {
1379              int viewState = R.styleable.ViewDrawableStates[i];
1380              for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) {
1381                  if (VIEW_STATE_IDS[j] == viewState) {
1382                      orderedIds[i * 2] = viewState;
1383                      orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1];
1384                  }
1385              }
1386          }
1387          final int NUM_BITS = VIEW_STATE_IDS.length / 2;
1388          VIEW_STATE_SETS = new int[1 << NUM_BITS][];
1389          for (int i = 0; i < VIEW_STATE_SETS.length; i++) {
1390              int numBits = Integer.bitCount(i);
1391              int[] set = new int[numBits];
1392              int pos = 0;
1393              for (int j = 0; j < orderedIds.length; j += 2) {
1394                  if ((i & orderedIds[j+1]) != 0) {
1395                      set[pos++] = orderedIds[j];
1396                  }
1397              }
1398              VIEW_STATE_SETS[i] = set;
1399          }
1400  
1401          EMPTY_STATE_SET = VIEW_STATE_SETS[0];
1402          WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED];
1403          SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED];
1404          SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1405                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED];
1406          FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED];
1407          FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1408                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED];
1409          FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[
1410                  VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED];
1411          FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1412                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
1413                  | VIEW_STATE_FOCUSED];
1414          ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED];
1415          ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1416                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED];
1417          ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[
1418                  VIEW_STATE_SELECTED | VIEW_STATE_ENABLED];
1419          ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1420                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
1421                  | VIEW_STATE_ENABLED];
1422          ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1423                  VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED];
1424          ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1425                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED
1426                  | VIEW_STATE_ENABLED];
1427          ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[
1428                  VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED
1429                  | VIEW_STATE_ENABLED];
1430          ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1431                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
1432                  | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED];
1433  
1434          PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED];
1435          PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1436                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED];
1437          PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[
1438                  VIEW_STATE_SELECTED | VIEW_STATE_PRESSED];
1439          PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1440                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
1441                  | VIEW_STATE_PRESSED];
1442          PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1443                  VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED];
1444          PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1445                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED
1446                  | VIEW_STATE_PRESSED];
1447          PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[
1448                  VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED
1449                  | VIEW_STATE_PRESSED];
1450          PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1451                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
1452                  | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED];
1453          PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[
1454                  VIEW_STATE_ENABLED | VIEW_STATE_PRESSED];
1455          PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1456                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED
1457                  | VIEW_STATE_PRESSED];
1458          PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[
1459                  VIEW_STATE_SELECTED | VIEW_STATE_ENABLED
1460                  | VIEW_STATE_PRESSED];
1461          PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1462                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
1463                  | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED];
1464          PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1465                  VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED
1466                  | VIEW_STATE_PRESSED];
1467          PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1468                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED
1469                  | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED];
1470          PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[
1471                  VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED
1472                  | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED];
1473          PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
1474                  VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
1475                  | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED
1476                  | VIEW_STATE_PRESSED];
1477      }
1478  
1479      /**
1480       * Accessibility event types that are dispatched for text population.
1481       */
1482      private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES =
1483              AccessibilityEvent.TYPE_VIEW_CLICKED
1484              | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED
1485              | AccessibilityEvent.TYPE_VIEW_SELECTED
1486              | AccessibilityEvent.TYPE_VIEW_FOCUSED
1487              | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED
1488              | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER
1489              | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT
1490              | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED;
1491  
1492      /**
1493       * Temporary Rect currently for use in setBackground().  This will probably
1494       * be extended in the future to hold our own class with more than just
1495       * a Rect. :)
1496       */
1497      static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>();
1498  
1499      /**
1500       * Map used to store views' tags.
1501       */
1502      private SparseArray<Object> mKeyedTags;
1503  
1504      /**
1505       * The next available accessiiblity id.
1506       */
1507      private static int sNextAccessibilityViewId;
1508  
1509      /**
1510       * The animation currently associated with this view.
1511       * @hide
1512       */
1513      protected Animation mCurrentAnimation = null;
1514  
1515      /**
1516       * Width as measured during measure pass.
1517       * {@hide}
1518       */
1519      @ViewDebug.ExportedProperty(category = "measurement")
1520      int mMeasuredWidth;
1521  
1522      /**
1523       * Height as measured during measure pass.
1524       * {@hide}
1525       */
1526      @ViewDebug.ExportedProperty(category = "measurement")
1527      int mMeasuredHeight;
1528  
1529      /**
1530       * Flag to indicate that this view was marked INVALIDATED, or had its display list
1531       * invalidated, prior to the current drawing iteration. If true, the view must re-draw
1532       * its display list. This flag, used only when hw accelerated, allows us to clear the
1533       * flag while retaining this information until it's needed (at getDisplayList() time and
1534       * in drawChild(), when we decide to draw a view's children's display lists into our own).
1535       *
1536       * {@hide}
1537       */
1538      boolean mRecreateDisplayList = false;
1539  
1540      /**
1541       * The view's identifier.
1542       * {@hide}
1543       *
1544       * @see #setId(int)
1545       * @see #getId()
1546       */
1547      @ViewDebug.ExportedProperty(resolveId = true)
1548      int mID = NO_ID;
1549  
1550      /**
1551       * The stable ID of this view for accessibility porposes.
1552       */
1553      int mAccessibilityViewId = NO_ID;
1554  
1555      /**
1556       * The view's tag.
1557       * {@hide}
1558       *
1559       * @see #setTag(Object)
1560       * @see #getTag()
1561       */
1562      protected Object mTag;
1563  
1564      // for mPrivateFlags:
1565      /** {@hide} */
1566      static final int WANTS_FOCUS                    = 0x00000001;
1567      /** {@hide} */
1568      static final int FOCUSED                        = 0x00000002;
1569      /** {@hide} */
1570      static final int SELECTED                       = 0x00000004;
1571      /** {@hide} */
1572      static final int IS_ROOT_NAMESPACE              = 0x00000008;
1573      /** {@hide} */
1574      static final int HAS_BOUNDS                     = 0x00000010;
1575      /** {@hide} */
1576      static final int DRAWN                          = 0x00000020;
1577      /**
1578       * When this flag is set, this view is running an animation on behalf of its
1579       * children and should therefore not cancel invalidate requests, even if they
1580       * lie outside of this view's bounds.
1581       *
1582       * {@hide}
1583       */
1584      static final int DRAW_ANIMATION                 = 0x00000040;
1585      /** {@hide} */
1586      static final int SKIP_DRAW                      = 0x00000080;
1587      /** {@hide} */
1588      static final int ONLY_DRAWS_BACKGROUND          = 0x00000100;
1589      /** {@hide} */
1590      static final int REQUEST_TRANSPARENT_REGIONS    = 0x00000200;
1591      /** {@hide} */
1592      static final int DRAWABLE_STATE_DIRTY           = 0x00000400;
1593      /** {@hide} */
1594      static final int MEASURED_DIMENSION_SET         = 0x00000800;
1595      /** {@hide} */
1596      static final int FORCE_LAYOUT                   = 0x00001000;
1597      /** {@hide} */
1598      static final int LAYOUT_REQUIRED                = 0x00002000;
1599  
1600      private static final int PRESSED                = 0x00004000;
1601  
1602      /** {@hide} */
1603      static final int DRAWING_CACHE_VALID            = 0x00008000;
1604      /**
1605       * Flag used to indicate that this view should be drawn once more (and only once
1606       * more) after its animation has completed.
1607       * {@hide}
1608       */
1609      static final int ANIMATION_STARTED              = 0x00010000;
1610  
1611      private static final int SAVE_STATE_CALLED      = 0x00020000;
1612  
1613      /**
1614       * Indicates that the View returned true when onSetAlpha() was called and that
1615       * the alpha must be restored.
1616       * {@hide}
1617       */
1618      static final int ALPHA_SET                      = 0x00040000;
1619  
1620      /**
1621       * Set by {@link #setScrollContainer(boolean)}.
1622       */
1623      static final int SCROLL_CONTAINER               = 0x00080000;
1624  
1625      /**
1626       * Set by {@link #setScrollContainer(boolean)}.
1627       */
1628      static final int SCROLL_CONTAINER_ADDED         = 0x00100000;
1629  
1630      /**
1631       * View flag indicating whether this view was invalidated (fully or partially.)
1632       *
1633       * @hide
1634       */
1635      static final int DIRTY                          = 0x00200000;
1636  
1637      /**
1638       * View flag indicating whether this view was invalidated by an opaque
1639       * invalidate request.
1640       *
1641       * @hide
1642       */
1643      static final int DIRTY_OPAQUE                   = 0x00400000;
1644  
1645      /**
1646       * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}.
1647       *
1648       * @hide
1649       */
1650      static final int DIRTY_MASK                     = 0x00600000;
1651  
1652      /**
1653       * Indicates whether the background is opaque.
1654       *
1655       * @hide
1656       */
1657      static final int OPAQUE_BACKGROUND              = 0x00800000;
1658  
1659      /**
1660       * Indicates whether the scrollbars are opaque.
1661       *
1662       * @hide
1663       */
1664      static final int OPAQUE_SCROLLBARS              = 0x01000000;
1665  
1666      /**
1667       * Indicates whether the view is opaque.
1668       *
1669       * @hide
1670       */
1671      static final int OPAQUE_MASK                    = 0x01800000;
1672  
1673      /**
1674       * Indicates a prepressed state;
1675       * the short time between ACTION_DOWN and recognizing
1676       * a 'real' press. Prepressed is used to recognize quick taps
1677       * even when they are shorter than ViewConfiguration.getTapTimeout().
1678       *
1679       * @hide
1680       */
1681      private static final int PREPRESSED             = 0x02000000;
1682  
1683      /**
1684       * Indicates whether the view is temporarily detached.
1685       *
1686       * @hide
1687       */
1688      static final int CANCEL_NEXT_UP_EVENT = 0x04000000;
1689  
1690      /**
1691       * Indicates that we should awaken scroll bars once attached
1692       *
1693       * @hide
1694       */
1695      private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000;
1696  
1697      /**
1698       * Indicates that the view has received HOVER_ENTER.  Cleared on HOVER_EXIT.
1699       * @hide
1700       */
1701      private static final int HOVERED              = 0x10000000;
1702  
1703      /**
1704       * Indicates that pivotX or pivotY were explicitly set and we should not assume the center
1705       * for transform operations
1706       *
1707       * @hide
1708       */
1709      private static final int PIVOT_EXPLICITLY_SET = 0x20000000;
1710  
1711      /** {@hide} */
1712      static final int ACTIVATED                    = 0x40000000;
1713  
1714      /**
1715       * Indicates that this view was specifically invalidated, not just dirtied because some
1716       * child view was invalidated. The flag is used to determine when we need to recreate
1717       * a view's display list (as opposed to just returning a reference to its existing
1718       * display list).
1719       *
1720       * @hide
1721       */
1722      static final int INVALIDATED                  = 0x80000000;
1723  
1724      /* Masks for mPrivateFlags2 */
1725  
1726      /**
1727       * Indicates that this view has reported that it can accept the current drag's content.
1728       * Cleared when the drag operation concludes.
1729       * @hide
1730       */
1731      static final int DRAG_CAN_ACCEPT              = 0x00000001;
1732  
1733      /**
1734       * Indicates that this view is currently directly under the drag location in a
1735       * drag-and-drop operation involving content that it can accept.  Cleared when
1736       * the drag exits the view, or when the drag operation concludes.
1737       * @hide
1738       */
1739      static final int DRAG_HOVERED                 = 0x00000002;
1740  
1741      /**
1742       * Indicates whether the view layout direction has been resolved and drawn to the
1743       * right-to-left direction.
1744       *
1745       * @hide
1746       */
1747      static final int LAYOUT_DIRECTION_RESOLVED_RTL = 0x00000004;
1748  
1749      /**
1750       * Indicates whether the view layout direction has been resolved.
1751       *
1752       * @hide
1753       */
1754      static final int LAYOUT_DIRECTION_RESOLVED = 0x00000008;
1755  
1756  
1757      /* End of masks for mPrivateFlags2 */
1758  
1759      static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED;
1760  
1761      /**
1762       * Always allow a user to over-scroll this view, provided it is a
1763       * view that can scroll.
1764       *
1765       * @see #getOverScrollMode()
1766       * @see #setOverScrollMode(int)
1767       */
1768      public static final int OVER_SCROLL_ALWAYS = 0;
1769  
1770      /**
1771       * Allow a user to over-scroll this view only if the content is large
1772       * enough to meaningfully scroll, provided it is a view that can scroll.
1773       *
1774       * @see #getOverScrollMode()
1775       * @see #setOverScrollMode(int)
1776       */
1777      public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1;
1778  
1779      /**
1780       * Never allow a user to over-scroll this view.
1781       *
1782       * @see #getOverScrollMode()
1783       * @see #setOverScrollMode(int)
1784       */
1785      public static final int OVER_SCROLL_NEVER = 2;
1786  
1787      /**
1788       * View has requested the system UI (status bar) to be visible (the default).
1789       *
1790       * @see #setSystemUiVisibility(int)
1791       */
1792      public static final int SYSTEM_UI_FLAG_VISIBLE = 0;
1793  
1794      /**
1795       * View has requested the system UI to enter an unobtrusive "low profile" mode.
1796       *
1797       * This is for use in games, book readers, video players, or any other "immersive" application
1798       * where the usual system chrome is deemed too distracting.
1799       *
1800       * In low profile mode, the status bar and/or navigation icons may dim.
1801       *
1802       * @see #setSystemUiVisibility(int)
1803       */
1804      public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001;
1805  
1806      /**
1807       * View has requested that the system navigation be temporarily hidden.
1808       *
1809       * This is an even less obtrusive state than that called for by
1810       * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls
1811       * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause
1812       * those to disappear. This is useful (in conjunction with the
1813       * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and
1814       * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN}
1815       * window flags) for displaying content using every last pixel on the display.
1816       *
1817       * There is a limitation: because navigation controls are so important, the least user
1818       * interaction will cause them to reappear immediately.
1819       *
1820       * @see #setSystemUiVisibility(int)
1821       */
1822      public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002;
1823  
1824      /**
1825       * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead.
1826       */
1827      public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE;
1828  
1829      /**
1830       * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead.
1831       */
1832      public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE;
1833  
1834      /**
1835       * @hide
1836       *
1837       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
1838       * out of the public fields to keep the undefined bits out of the developer's way.
1839       *
1840       * Flag to make the status bar not expandable.  Unless you also
1841       * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show.
1842       */
1843      public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000;
1844  
1845      /**
1846       * @hide
1847       *
1848       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
1849       * out of the public fields to keep the undefined bits out of the developer's way.
1850       *
1851       * Flag to hide notification icons and scrolling ticker text.
1852       */
1853      public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000;
1854  
1855      /**
1856       * @hide
1857       *
1858       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
1859       * out of the public fields to keep the undefined bits out of the developer's way.
1860       *
1861       * Flag to disable incoming notification alerts.  This will not block
1862       * icons, but it will block sound, vibrating and other visual or aural notifications.
1863       */
1864      public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000;
1865  
1866      /**
1867       * @hide
1868       *
1869       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
1870       * out of the public fields to keep the undefined bits out of the developer's way.
1871       *
1872       * Flag to hide only the scrolling ticker.  Note that
1873       * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies
1874       * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}.
1875       */
1876      public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000;
1877  
1878      /**
1879       * @hide
1880       *
1881       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
1882       * out of the public fields to keep the undefined bits out of the developer's way.
1883       *
1884       * Flag to hide the center system info area.
1885       */
1886      public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000;
1887  
1888      /**
1889       * @hide
1890       *
1891       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
1892       * out of the public fields to keep the undefined bits out of the developer's way.
1893       *
1894       * Flag to hide only the home button.  Don't use this
1895       * unless you're a special part of the system UI (i.e., setup wizard, keyguard).
1896       */
1897      public static final int STATUS_BAR_DISABLE_HOME = 0x00200000;
1898  
1899      /**
1900       * @hide
1901       *
1902       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
1903       * out of the public fields to keep the undefined bits out of the developer's way.
1904       *
1905       * Flag to hide only the back button. Don't use this
1906       * unless you're a special part of the system UI (i.e., setup wizard, keyguard).
1907       */
1908      public static final int STATUS_BAR_DISABLE_BACK = 0x00400000;
1909  
1910      /**
1911       * @hide
1912       *
1913       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
1914       * out of the public fields to keep the undefined bits out of the developer's way.
1915       *
1916       * Flag to hide only the clock.  You might use this if your activity has
1917       * its own clock making the status bar's clock redundant.
1918       */
1919      public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000;
1920  
1921      /**
1922       * @hide
1923       *
1924       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
1925       * out of the public fields to keep the undefined bits out of the developer's way.
1926       *
1927       * Flag to hide only the recent apps button. Don't use this
1928       * unless you're a special part of the system UI (i.e., setup wizard, keyguard).
1929       */
1930      public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000;
1931  
1932      /**
1933       * @hide
1934       *
1935       * NOTE: This flag may only be used in subtreeSystemUiVisibility, etc. etc.
1936       *
1937       * This hides HOME and RECENT and is provided for compatibility with interim implementations.
1938       */
1939      @Deprecated
1940      public static final int STATUS_BAR_DISABLE_NAVIGATION =
1941              STATUS_BAR_DISABLE_HOME | STATUS_BAR_DISABLE_RECENT;
1942  
1943      /**
1944       * @hide
1945       */
1946      public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF;
1947  
1948      /**
1949       * These are the system UI flags that can be cleared by events outside
1950       * of an application.  Currently this is just the ability to tap on the
1951       * screen while hiding the navigation bar to have it return.
1952       * @hide
1953       */
1954      public static final int SYSTEM_UI_CLEARABLE_FLAGS =
1955              SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION;
1956  
1957      /**
1958       * Find views that render the specified text.
1959       *
1960       * @see #findViewsWithText(ArrayList, CharSequence, int)
1961       */
1962      public static final int FIND_VIEWS_WITH_TEXT = 0x00000001;
1963  
1964      /**
1965       * Find find views that contain the specified content description.
1966       *
1967       * @see #findViewsWithText(ArrayList, CharSequence, int)
1968       */
1969      public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002;
1970  
1971      /**
1972       * Controls the over-scroll mode for this view.
1973       * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)},
1974       * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS},
1975       * and {@link #OVER_SCROLL_NEVER}.
1976       */
1977      private int mOverScrollMode;
1978  
1979      /**
1980       * The parent this view is attached to.
1981       * {@hide}
1982       *
1983       * @see #getParent()
1984       */
1985      protected ViewParent mParent;
1986  
1987      /**
1988       * {@hide}
1989       */
1990      AttachInfo mAttachInfo;
1991  
1992      /**
1993       * {@hide}
1994       */
1995      @ViewDebug.ExportedProperty(flagMapping = {
1996          @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT,
1997                  name = "FORCE_LAYOUT"),
1998          @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED,
1999                  name = "LAYOUT_REQUIRED"),
2000          @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID,
2001              name = "DRAWING_CACHE_INVALID", outputIf = false),
2002          @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true),
2003          @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false),
2004          @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"),
2005          @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY")
2006      })
2007      int mPrivateFlags;
2008      int mPrivateFlags2;
2009  
2010      /**
2011       * This view's request for the visibility of the status bar.
2012       * @hide
2013       */
2014      @ViewDebug.ExportedProperty(flagMapping = {
2015          @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE,
2016                                  equals = SYSTEM_UI_FLAG_LOW_PROFILE,
2017                                  name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true),
2018          @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION,
2019                                  equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION,
2020                                  name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true),
2021          @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK,
2022                                  equals = SYSTEM_UI_FLAG_VISIBLE,
2023                                  name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true)
2024      })
2025      int mSystemUiVisibility;
2026  
2027      /**
2028       * Count of how many windows this view has been attached to.
2029       */
2030      int mWindowAttachCount;
2031  
2032      /**
2033       * The layout parameters associated with this view and used by the parent
2034       * {@link android.view.ViewGroup} to determine how this view should be
2035       * laid out.
2036       * {@hide}
2037       */
2038      protected ViewGroup.LayoutParams mLayoutParams;
2039  
2040      /**
2041       * The view flags hold various views states.
2042       * {@hide}
2043       */
2044      @ViewDebug.ExportedProperty
2045      int mViewFlags;
2046  
2047      static class TransformationInfo {
2048          /**
2049           * The transform matrix for the View. This transform is calculated internally
2050           * based on the rotation, scaleX, and scaleY properties. The identity matrix
2051           * is used by default. Do *not* use this variable directly; instead call
2052           * getMatrix(), which will automatically recalculate the matrix if necessary
2053           * to get the correct matrix based on the latest rotation and scale properties.
2054           */
2055          private final Matrix mMatrix = new Matrix();
2056  
2057          /**
2058           * The transform matrix for the View. This transform is calculated internally
2059           * based on the rotation, scaleX, and scaleY properties. The identity matrix
2060           * is used by default. Do *not* use this variable directly; instead call
2061           * getInverseMatrix(), which will automatically recalculate the matrix if necessary
2062           * to get the correct matrix based on the latest rotation and scale properties.
2063           */
2064          private Matrix mInverseMatrix;
2065  
2066          /**
2067           * An internal variable that tracks whether we need to recalculate the
2068           * transform matrix, based on whether the rotation or scaleX/Y properties
2069           * have changed since the matrix was last calculated.
2070           */
2071          boolean mMatrixDirty = false;
2072  
2073          /**
2074           * An internal variable that tracks whether we need to recalculate the
2075           * transform matrix, based on whether the rotation or scaleX/Y properties
2076           * have changed since the matrix was last calculated.
2077           */
2078          private boolean mInverseMatrixDirty = true;
2079  
2080          /**
2081           * A variable that tracks whether we need to recalculate the
2082           * transform matrix, based on whether the rotation or scaleX/Y properties
2083           * have changed since the matrix was last calculated. This variable
2084           * is only valid after a call to updateMatrix() or to a function that
2085           * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix().
2086           */
2087          private boolean mMatrixIsIdentity = true;
2088  
2089          /**
2090           * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set.
2091           */
2092          private Camera mCamera = null;
2093  
2094          /**
2095           * This matrix is used when computing the matrix for 3D rotations.
2096           */
2097          private Matrix matrix3D = null;
2098  
2099          /**
2100           * These prev values are used to recalculate a centered pivot point when necessary. The
2101           * pivot point is only used in matrix operations (when rotation, scale, or translation are
2102           * set), so thes values are only used then as well.
2103           */
2104          private int mPrevWidth = -1;
2105          private int mPrevHeight = -1;
2106  
2107          /**
2108           * The degrees rotation around the vertical axis through the pivot point.
2109           */
2110          @ViewDebug.ExportedProperty
2111          float mRotationY = 0f;
2112  
2113          /**
2114           * The degrees rotation around the horizontal axis through the pivot point.
2115           */
2116          @ViewDebug.ExportedProperty
2117          float mRotationX = 0f;
2118  
2119          /**
2120           * The degrees rotation around the pivot point.
2121           */
2122          @ViewDebug.ExportedProperty
2123          float mRotation = 0f;
2124  
2125          /**
2126           * The amount of translation of the object away from its left property (post-layout).
2127           */
2128          @ViewDebug.ExportedProperty
2129          float mTranslationX = 0f;
2130  
2131          /**
2132           * The amount of translation of the object away from its top property (post-layout).
2133           */
2134          @ViewDebug.ExportedProperty
2135          float mTranslationY = 0f;
2136  
2137          /**
2138           * The amount of scale in the x direction around the pivot point. A
2139           * value of 1 means no scaling is applied.
2140           */
2141          @ViewDebug.ExportedProperty
2142          float mScaleX = 1f;
2143  
2144          /**
2145           * The amount of scale in the y direction around the pivot point. A
2146           * value of 1 means no scaling is applied.
2147           */
2148          @ViewDebug.ExportedProperty
2149          float mScaleY = 1f;
2150  
2151          /**
2152           * The amount of scale in the x direction around the pivot point. A
2153           * value of 1 means no scaling is applied.
2154           */
2155          @ViewDebug.ExportedProperty
2156          float mPivotX = 0f;
2157  
2158          /**
2159           * The amount of scale in the y direction around the pivot point. A
2160           * value of 1 means no scaling is applied.
2161           */
2162          @ViewDebug.ExportedProperty
2163          float mPivotY = 0f;
2164  
2165          /**
2166           * The opacity of the View. This is a value from 0 to 1, where 0 means
2167           * completely transparent and 1 means completely opaque.
2168           */
2169          @ViewDebug.ExportedProperty
2170          float mAlpha = 1f;
2171      }
2172  
2173      TransformationInfo mTransformationInfo;
2174  
2175      private boolean mLastIsOpaque;
2176  
2177      /**
2178       * Convenience value to check for float values that are close enough to zero to be considered
2179       * zero.
2180       */
2181      private static final float NONZERO_EPSILON = .001f;
2182  
2183      /**
2184       * The distance in pixels from the left edge of this view's parent
2185       * to the left edge of this view.
2186       * {@hide}
2187       */
2188      @ViewDebug.ExportedProperty(category = "layout")
2189      protected int mLeft;
2190      /**
2191       * The distance in pixels from the left edge of this view's parent
2192       * to the right edge of this view.
2193       * {@hide}
2194       */
2195      @ViewDebug.ExportedProperty(category = "layout")
2196      protected int mRight;
2197      /**
2198       * The distance in pixels from the top edge of this view's parent
2199       * to the top edge of this view.
2200       * {@hide}
2201       */
2202      @ViewDebug.ExportedProperty(category = "layout")
2203      protected int mTop;
2204      /**
2205       * The distance in pixels from the top edge of this view's parent
2206       * to the bottom edge of this view.
2207       * {@hide}
2208       */
2209      @ViewDebug.ExportedProperty(category = "layout")
2210      protected int mBottom;
2211  
2212      /**
2213       * The offset, in pixels, by which the content of this view is scrolled
2214       * horizontally.
2215       * {@hide}
2216       */
2217      @ViewDebug.ExportedProperty(category = "scrolling")
2218      protected int mScrollX;
2219      /**
2220       * The offset, in pixels, by which the content of this view is scrolled
2221       * vertically.
2222       * {@hide}
2223       */
2224      @ViewDebug.ExportedProperty(category = "scrolling")
2225      protected int mScrollY;
2226  
2227      /**
2228       * The left padding in pixels, that is the distance in pixels between the
2229       * left edge of this view and the left edge of its content.
2230       * {@hide}
2231       */
2232      @ViewDebug.ExportedProperty(category = "padding")
2233      protected int mPaddingLeft;
2234      /**
2235       * The right padding in pixels, that is the distance in pixels between the
2236       * right edge of this view and the right edge of its content.
2237       * {@hide}
2238       */
2239      @ViewDebug.ExportedProperty(category = "padding")
2240      protected int mPaddingRight;
2241      /**
2242       * The top padding in pixels, that is the distance in pixels between the
2243       * top edge of this view and the top edge of its content.
2244       * {@hide}
2245       */
2246      @ViewDebug.ExportedProperty(category = "padding")
2247      protected int mPaddingTop;
2248      /**
2249       * The bottom padding in pixels, that is the distance in pixels between the
2250       * bottom edge of this view and the bottom edge of its content.
2251       * {@hide}
2252       */
2253      @ViewDebug.ExportedProperty(category = "padding")
2254      protected int mPaddingBottom;
2255  
2256      /**
2257       * Briefly describes the view and is primarily used for accessibility support.
2258       */
2259      private CharSequence mContentDescription;
2260  
2261      /**
2262       * Cache the paddingRight set by the user to append to the scrollbar's size.
2263       *
2264       * @hide
2265       */
2266      @ViewDebug.ExportedProperty(category = "padding")
2267      protected int mUserPaddingRight;
2268  
2269      /**
2270       * Cache the paddingBottom set by the user to append to the scrollbar's size.
2271       *
2272       * @hide
2273       */
2274      @ViewDebug.ExportedProperty(category = "padding")
2275      protected int mUserPaddingBottom;
2276  
2277      /**
2278       * Cache the paddingLeft set by the user to append to the scrollbar's size.
2279       *
2280       * @hide
2281       */
2282      @ViewDebug.ExportedProperty(category = "padding")
2283      protected int mUserPaddingLeft;
2284  
2285      /**
2286       * Cache if the user padding is relative.
2287       *
2288       */
2289      @ViewDebug.ExportedProperty(category = "padding")
2290      boolean mUserPaddingRelative;
2291  
2292      /**
2293       * Cache the paddingStart set by the user to append to the scrollbar's size.
2294       *
2295       */
2296      @ViewDebug.ExportedProperty(category = "padding")
2297      int mUserPaddingStart;
2298  
2299      /**
2300       * Cache the paddingEnd set by the user to append to the scrollbar's size.
2301       *
2302       */
2303      @ViewDebug.ExportedProperty(category = "padding")
2304      int mUserPaddingEnd;
2305  
2306      /**
2307       * @hide
2308       */
2309      int mOldWidthMeasureSpec = Integer.MIN_VALUE;
2310      /**
2311       * @hide
2312       */
2313      int mOldHeightMeasureSpec = Integer.MIN_VALUE;
2314  
2315      private Drawable mBGDrawable;
2316  
2317      private int mBackgroundResource;
2318      private boolean mBackgroundSizeChanged;
2319  
2320      /**
2321       * Listener used to dispatch focus change events.
2322       * This field should be made private, so it is hidden from the SDK.
2323       * {@hide}
2324       */
2325      protected OnFocusChangeListener mOnFocusChangeListener;
2326  
2327      /**
2328       * Listeners for layout change events.
2329       */
2330      private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners;
2331  
2332      /**
2333       * Listeners for attach events.
2334       */
2335      private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners;
2336  
2337      /**
2338       * Listener used to dispatch click events.
2339       * This field should be made private, so it is hidden from the SDK.
2340       * {@hide}
2341       */
2342      protected OnClickListener mOnClickListener;
2343  
2344      /**
2345       * Listener used to dispatch long click events.
2346       * This field should be made private, so it is hidden from the SDK.
2347       * {@hide}
2348       */
2349      protected OnLongClickListener mOnLongClickListener;
2350  
2351      /**
2352       * Listener used to build the context menu.
2353       * This field should be made private, so it is hidden from the SDK.
2354       * {@hide}
2355       */
2356      protected OnCreateContextMenuListener mOnCreateContextMenuListener;
2357  
2358      private OnKeyListener mOnKeyListener;
2359  
2360      private OnTouchListener mOnTouchListener;
2361  
2362      private OnHoverListener mOnHoverListener;
2363  
2364      private OnGenericMotionListener mOnGenericMotionListener;
2365  
2366      private OnDragListener mOnDragListener;
2367  
2368      private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener;
2369  
2370      /**
2371       * The application environment this view lives in.
2372       * This field should be made private, so it is hidden from the SDK.
2373       * {@hide}
2374       */
2375      protected Context mContext;
2376  
2377      private final Resources mResources;
2378  
2379      private ScrollabilityCache mScrollCache;
2380  
2381      private int[] mDrawableState = null;
2382  
2383      /**
2384       * Set to true when drawing cache is enabled and cannot be created.
2385       *
2386       * @hide
2387       */
2388      public boolean mCachingFailed;
2389  
2390      private Bitmap mDrawingCache;
2391      private Bitmap mUnscaledDrawingCache;
2392      private HardwareLayer mHardwareLayer;
2393      DisplayList mDisplayList;
2394  
2395      /**
2396       * When this view has focus and the next focus is {@link #FOCUS_LEFT},
2397       * the user may specify which view to go to next.
2398       */
2399      private int mNextFocusLeftId = View.NO_ID;
2400  
2401      /**
2402       * When this view has focus and the next focus is {@link #FOCUS_RIGHT},
2403       * the user may specify which view to go to next.
2404       */
2405      private int mNextFocusRightId = View.NO_ID;
2406  
2407      /**
2408       * When this view has focus and the next focus is {@link #FOCUS_UP},
2409       * the user may specify which view to go to next.
2410       */
2411      private int mNextFocusUpId = View.NO_ID;
2412  
2413      /**
2414       * When this view has focus and the next focus is {@link #FOCUS_DOWN},
2415       * the user may specify which view to go to next.
2416       */
2417      private int mNextFocusDownId = View.NO_ID;
2418  
2419      /**
2420       * When this view has focus and the next focus is {@link #FOCUS_FORWARD},
2421       * the user may specify which view to go to next.
2422       */
2423      int mNextFocusForwardId = View.NO_ID;
2424  
2425      private CheckForLongPress mPendingCheckForLongPress;
2426      private CheckForTap mPendingCheckForTap = null;
2427      private PerformClick mPerformClick;
2428      private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent;
2429  
2430      private UnsetPressedState mUnsetPressedState;
2431  
2432      /**
2433       * Whether the long press's action has been invoked.  The tap's action is invoked on the
2434       * up event while a long press is invoked as soon as the long press duration is reached, so
2435       * a long press could be performed before the tap is checked, in which case the tap's action
2436       * should not be invoked.
2437       */
2438      private boolean mHasPerformedLongPress;
2439  
2440      /**
2441       * The minimum height of the view. We'll try our best to have the height
2442       * of this view to at least this amount.
2443       */
2444      @ViewDebug.ExportedProperty(category = "measurement")
2445      private int mMinHeight;
2446  
2447      /**
2448       * The minimum width of the view. We'll try our best to have the width
2449       * of this view to at least this amount.
2450       */
2451      @ViewDebug.ExportedProperty(category = "measurement")
2452      private int mMinWidth;
2453  
2454      /**
2455       * The delegate to handle touch events that are physically in this view
2456       * but should be handled by another view.
2457       */
2458      private TouchDelegate mTouchDelegate = null;
2459  
2460      /**
2461       * Solid color to use as a background when creating the drawing cache. Enables
2462       * the cache to use 16 bit bitmaps instead of 32 bit.
2463       */
2464      private int mDrawingCacheBackgroundColor = 0;
2465  
2466      /**
2467       * Special tree observer used when mAttachInfo is null.
2468       */
2469      private ViewTreeObserver mFloatingTreeObserver;
2470  
2471      /**
2472       * Cache the touch slop from the context that created the view.
2473       */
2474      private int mTouchSlop;
2475  
2476      /**
2477       * Object that handles automatic animation of view properties.
2478       */
2479      private ViewPropertyAnimator mAnimator = null;
2480  
2481      /**
2482       * Flag indicating that a drag can cross window boundaries.  When
2483       * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called
2484       * with this flag set, all visible applications will be able to participate
2485       * in the drag operation and receive the dragged content.
2486       *
2487       * @hide
2488       */
2489      public static final int DRAG_FLAG_GLOBAL = 1;
2490  
2491      /**
2492       * Vertical scroll factor cached by {@link #getVerticalScrollFactor}.
2493       */
2494      private float mVerticalScrollFactor;
2495  
2496      /**
2497       * Position of the vertical scroll bar.
2498       */
2499      private int mVerticalScrollbarPosition;
2500  
2501      /**
2502       * Position the scroll bar at the default position as determined by the system.
2503       */
2504      public static final int SCROLLBAR_POSITION_DEFAULT = 0;
2505  
2506      /**
2507       * Position the scroll bar along the left edge.
2508       */
2509      public static final int SCROLLBAR_POSITION_LEFT = 1;
2510  
2511      /**
2512       * Position the scroll bar along the right edge.
2513       */
2514      public static final int SCROLLBAR_POSITION_RIGHT = 2;
2515  
2516      /**
2517       * Indicates that the view does not have a layer.
2518       *
2519       * @see #getLayerType()
2520       * @see #setLayerType(int, android.graphics.Paint)
2521       * @see #LAYER_TYPE_SOFTWARE
2522       * @see #LAYER_TYPE_HARDWARE
2523       */
2524      public static final int LAYER_TYPE_NONE = 0;
2525  
2526      /**
2527       * <p>Indicates that the view has a software layer. A software layer is backed
2528       * by a bitmap and causes the view to be rendered using Android's software
2529       * rendering pipeline, even if hardware acceleration is enabled.</p>
2530       *
2531       * <p>Software layers have various usages:</p>
2532       * <p>When the application is not using hardware acceleration, a software layer
2533       * is useful to apply a specific color filter and/or blending mode and/or
2534       * translucency to a view and all its children.</p>
2535       * <p>When the application is using hardware acceleration, a software layer
2536       * is useful to render drawing primitives not supported by the hardware
2537       * accelerated pipeline. It can also be used to cache a complex view tree
2538       * into a texture and reduce the complexity of drawing operations. For instance,
2539       * when animating a complex view tree with a translation, a software layer can
2540       * be used to render the view tree only once.</p>
2541       * <p>Software layers should be avoided when the affected view tree updates
2542       * often. Every update will require to re-render the software layer, which can
2543       * potentially be slow (particularly when hardware acceleration is turned on
2544       * since the layer will have to be uploaded into a hardware texture after every
2545       * update.)</p>
2546       *
2547       * @see #getLayerType()
2548       * @see #setLayerType(int, android.graphics.Paint)
2549       * @see #LAYER_TYPE_NONE
2550       * @see #LAYER_TYPE_HARDWARE
2551       */
2552      public static final int LAYER_TYPE_SOFTWARE = 1;
2553  
2554      /**
2555       * <p>Indicates that the view has a hardware layer. A hardware layer is backed
2556       * by a hardware specific texture (generally Frame Buffer Objects or FBO on
2557       * OpenGL hardware) and causes the view to be rendered using Android's hardware
2558       * rendering pipeline, but only if hardware acceleration is turned on for the
2559       * view hierarchy. When hardware acceleration is turned off, hardware layers
2560       * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p>
2561       *
2562       * <p>A hardware layer is useful to apply a specific color filter and/or
2563       * blending mode and/or translucency to a view and all its children.</p>
2564       * <p>A hardware layer can be used to cache a complex view tree into a
2565       * texture and reduce the complexity of drawing operations. For instance,
2566       * when animating a complex view tree with a translation, a hardware layer can
2567       * be used to render the view tree only once.</p>
2568       * <p>A hardware layer can also be used to increase the rendering quality when
2569       * rotation transformations are applied on a view. It can also be used to
2570       * prevent potential clipping issues when applying 3D transforms on a view.</p>
2571       *
2572       * @see #getLayerType()
2573       * @see #setLayerType(int, android.graphics.Paint)
2574       * @see #LAYER_TYPE_NONE
2575       * @see #LAYER_TYPE_SOFTWARE
2576       */
2577      public static final int LAYER_TYPE_HARDWARE = 2;
2578  
2579      @ViewDebug.ExportedProperty(category = "drawing", mapping = {
2580              @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"),
2581              @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"),
2582              @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE")
2583      })
2584      int mLayerType = LAYER_TYPE_NONE;
2585      Paint mLayerPaint;
2586      Rect mLocalDirtyRect;
2587  
2588      /**
2589       * Set to true when the view is sending hover accessibility events because it
2590       * is the innermost hovered view.
2591       */
2592      private boolean mSendingHoverAccessibilityEvents;
2593  
2594      /**
2595       * Delegate for injecting accessiblity functionality.
2596       */
2597      AccessibilityDelegate mAccessibilityDelegate;
2598  
2599      /**
2600       * Text direction is inherited thru {@link ViewGroup}
2601       * @hide
2602       */
2603      public static final int TEXT_DIRECTION_INHERIT = 0;
2604  
2605      /**
2606       * Text direction is using "first strong algorithm". The first strong directional character
2607       * determines the paragraph direction. If there is no strong directional character, the
2608       * paragraph direction is the view's resolved ayout direction.
2609       *
2610       * @hide
2611       */
2612      public static final int TEXT_DIRECTION_FIRST_STRONG = 1;
2613  
2614      /**
2615       * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains
2616       * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters.
2617       * If there are neither, the paragraph direction is the view's resolved layout direction.
2618       *
2619       * @hide
2620       */
2621      public static final int TEXT_DIRECTION_ANY_RTL = 2;
2622  
2623      /**
2624       * Text direction is forced to LTR.
2625       *
2626       * @hide
2627       */
2628      public static final int TEXT_DIRECTION_LTR = 3;
2629  
2630      /**
2631       * Text direction is forced to RTL.
2632       *
2633       * @hide
2634       */
2635      public static final int TEXT_DIRECTION_RTL = 4;
2636  
2637      /**
2638       * Default text direction is inherited
2639       *
2640       * @hide
2641       */
2642      protected static int DEFAULT_TEXT_DIRECTION = TEXT_DIRECTION_INHERIT;
2643  
2644      /**
2645       * The text direction that has been defined by {@link #setTextDirection(int)}.
2646       *
2647       * {@hide}
2648       */
2649      @ViewDebug.ExportedProperty(category = "text", mapping = {
2650              @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"),
2651              @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"),
2652              @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"),
2653              @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"),
2654              @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL")
2655      })
2656      private int mTextDirection = DEFAULT_TEXT_DIRECTION;
2657  
2658      /**
2659       * The resolved text direction.  This needs resolution if the value is
2660       * TEXT_DIRECTION_INHERIT.  The resolution matches mTextDirection if that is
2661       * not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds up the parent
2662       * chain of the view.
2663       *
2664       * {@hide}
2665       */
2666      @ViewDebug.ExportedProperty(category = "text", mapping = {
2667              @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"),
2668              @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"),
2669              @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"),
2670              @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"),
2671              @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL")
2672      })
2673      private int mResolvedTextDirection = TEXT_DIRECTION_INHERIT;
2674  
2675      /**
2676       * Consistency verifier for debugging purposes.
2677       * @hide
2678       */
2679      protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier =
2680              InputEventConsistencyVerifier.isInstrumentationEnabled() ?
2681                      new InputEventConsistencyVerifier(this, 0) : null;
2682  
2683      /**
2684       * Simple constructor to use when creating a view from code.
2685       *
2686       * @param context The Context the view is running in, through which it can
2687       *        access the current theme, resources, etc.
2688       */
View(Context context)2689      public View(Context context) {
2690          mContext = context;
2691          mResources = context != null ? context.getResources() : null;
2692          mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | LAYOUT_DIRECTION_INHERIT;
2693          mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
2694          setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS);
2695          mUserPaddingStart = -1;
2696          mUserPaddingEnd = -1;
2697          mUserPaddingRelative = false;
2698      }
2699  
2700      /**
2701       * Constructor that is called when inflating a view from XML. This is called
2702       * when a view is being constructed from an XML file, supplying attributes
2703       * that were specified in the XML file. This version uses a default style of
2704       * 0, so the only attribute values applied are those in the Context's Theme
2705       * and the given AttributeSet.
2706       *
2707       * <p>
2708       * The method onFinishInflate() will be called after all children have been
2709       * added.
2710       *
2711       * @param context The Context the view is running in, through which it can
2712       *        access the current theme, resources, etc.
2713       * @param attrs The attributes of the XML tag that is inflating the view.
2714       * @see #View(Context, AttributeSet, int)
2715       */
View(Context context, AttributeSet attrs)2716      public View(Context context, AttributeSet attrs) {
2717          this(context, attrs, 0);
2718      }
2719  
2720      /**
2721       * Perform inflation from XML and apply a class-specific base style. This
2722       * constructor of View allows subclasses to use their own base style when
2723       * they are inflating. For example, a Button class's constructor would call
2724       * this version of the super class constructor and supply
2725       * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows
2726       * the theme's button style to modify all of the base view attributes (in
2727       * particular its background) as well as the Button class's attributes.
2728       *
2729       * @param context The Context the view is running in, through which it can
2730       *        access the current theme, resources, etc.
2731       * @param attrs The attributes of the XML tag that is inflating the view.
2732       * @param defStyle The default style to apply to this view. If 0, no style
2733       *        will be applied (beyond what is included in the theme). This may
2734       *        either be an attribute resource, whose value will be retrieved
2735       *        from the current theme, or an explicit style resource.
2736       * @see #View(Context, AttributeSet)
2737       */
View(Context context, AttributeSet attrs, int defStyle)2738      public View(Context context, AttributeSet attrs, int defStyle) {
2739          this(context);
2740  
2741          TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View,
2742                  defStyle, 0);
2743  
2744          Drawable background = null;
2745  
2746          int leftPadding = -1;
2747          int topPadding = -1;
2748          int rightPadding = -1;
2749          int bottomPadding = -1;
2750          int startPadding = -1;
2751          int endPadding = -1;
2752  
2753          int padding = -1;
2754  
2755          int viewFlagValues = 0;
2756          int viewFlagMasks = 0;
2757  
2758          boolean setScrollContainer = false;
2759  
2760          int x = 0;
2761          int y = 0;
2762  
2763          float tx = 0;
2764          float ty = 0;
2765          float rotation = 0;
2766          float rotationX = 0;
2767          float rotationY = 0;
2768          float sx = 1f;
2769          float sy = 1f;
2770          boolean transformSet = false;
2771  
2772          int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY;
2773  
2774          int overScrollMode = mOverScrollMode;
2775          final int N = a.getIndexCount();
2776          for (int i = 0; i < N; i++) {
2777              int attr = a.getIndex(i);
2778              switch (attr) {
2779                  case com.android.internal.R.styleable.View_background:
2780                      background = a.getDrawable(attr);
2781                      break;
2782                  case com.android.internal.R.styleable.View_padding:
2783                      padding = a.getDimensionPixelSize(attr, -1);
2784                      break;
2785                   case com.android.internal.R.styleable.View_paddingLeft:
2786                      leftPadding = a.getDimensionPixelSize(attr, -1);
2787                      break;
2788                  case com.android.internal.R.styleable.View_paddingTop:
2789                      topPadding = a.getDimensionPixelSize(attr, -1);
2790                      break;
2791                  case com.android.internal.R.styleable.View_paddingRight:
2792                      rightPadding = a.getDimensionPixelSize(attr, -1);
2793                      break;
2794                  case com.android.internal.R.styleable.View_paddingBottom:
2795                      bottomPadding = a.getDimensionPixelSize(attr, -1);
2796                      break;
2797                  case com.android.internal.R.styleable.View_paddingStart:
2798                      startPadding = a.getDimensionPixelSize(attr, -1);
2799                      break;
2800                  case com.android.internal.R.styleable.View_paddingEnd:
2801                      endPadding = a.getDimensionPixelSize(attr, -1);
2802                      break;
2803                  case com.android.internal.R.styleable.View_scrollX:
2804                      x = a.getDimensionPixelOffset(attr, 0);
2805                      break;
2806                  case com.android.internal.R.styleable.View_scrollY:
2807                      y = a.getDimensionPixelOffset(attr, 0);
2808                      break;
2809                  case com.android.internal.R.styleable.View_alpha:
2810                      setAlpha(a.getFloat(attr, 1f));
2811                      break;
2812                  case com.android.internal.R.styleable.View_transformPivotX:
2813                      setPivotX(a.getDimensionPixelOffset(attr, 0));
2814                      break;
2815                  case com.android.internal.R.styleable.View_transformPivotY:
2816                      setPivotY(a.getDimensionPixelOffset(attr, 0));
2817                      break;
2818                  case com.android.internal.R.styleable.View_translationX:
2819                      tx = a.getDimensionPixelOffset(attr, 0);
2820                      transformSet = true;
2821                      break;
2822                  case com.android.internal.R.styleable.View_translationY:
2823                      ty = a.getDimensionPixelOffset(attr, 0);
2824                      transformSet = true;
2825                      break;
2826                  case com.android.internal.R.styleable.View_rotation:
2827                      rotation = a.getFloat(attr, 0);
2828                      transformSet = true;
2829                      break;
2830                  case com.android.internal.R.styleable.View_rotationX:
2831                      rotationX = a.getFloat(attr, 0);
2832                      transformSet = true;
2833                      break;
2834                  case com.android.internal.R.styleable.View_rotationY:
2835                      rotationY = a.getFloat(attr, 0);
2836                      transformSet = true;
2837                      break;
2838                  case com.android.internal.R.styleable.View_scaleX:
2839                      sx = a.getFloat(attr, 1f);
2840                      transformSet = true;
2841                      break;
2842                  case com.android.internal.R.styleable.View_scaleY:
2843                      sy = a.getFloat(attr, 1f);
2844                      transformSet = true;
2845                      break;
2846                  case com.android.internal.R.styleable.View_id:
2847                      mID = a.getResourceId(attr, NO_ID);
2848                      break;
2849                  case com.android.internal.R.styleable.View_tag:
2850                      mTag = a.getText(attr);
2851                      break;
2852                  case com.android.internal.R.styleable.View_fitsSystemWindows:
2853                      if (a.getBoolean(attr, false)) {
2854                          viewFlagValues |= FITS_SYSTEM_WINDOWS;
2855                          viewFlagMasks |= FITS_SYSTEM_WINDOWS;
2856                      }
2857                      break;
2858                  case com.android.internal.R.styleable.View_focusable:
2859                      if (a.getBoolean(attr, false)) {
2860                          viewFlagValues |= FOCUSABLE;
2861                          viewFlagMasks |= FOCUSABLE_MASK;
2862                      }
2863                      break;
2864                  case com.android.internal.R.styleable.View_focusableInTouchMode:
2865                      if (a.getBoolean(attr, false)) {
2866                          viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE;
2867                          viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK;
2868                      }
2869                      break;
2870                  case com.android.internal.R.styleable.View_clickable:
2871                      if (a.getBoolean(attr, false)) {
2872                          viewFlagValues |= CLICKABLE;
2873                          viewFlagMasks |= CLICKABLE;
2874                      }
2875                      break;
2876                  case com.android.internal.R.styleable.View_longClickable:
2877                      if (a.getBoolean(attr, false)) {
2878                          viewFlagValues |= LONG_CLICKABLE;
2879                          viewFlagMasks |= LONG_CLICKABLE;
2880                      }
2881                      break;
2882                  case com.android.internal.R.styleable.View_saveEnabled:
2883                      if (!a.getBoolean(attr, true)) {
2884                          viewFlagValues |= SAVE_DISABLED;
2885                          viewFlagMasks |= SAVE_DISABLED_MASK;
2886                      }
2887                      break;
2888                  case com.android.internal.R.styleable.View_duplicateParentState:
2889                      if (a.getBoolean(attr, false)) {
2890                          viewFlagValues |= DUPLICATE_PARENT_STATE;
2891                          viewFlagMasks |= DUPLICATE_PARENT_STATE;
2892                      }
2893                      break;
2894                  case com.android.internal.R.styleable.View_visibility:
2895                      final int visibility = a.getInt(attr, 0);
2896                      if (visibility != 0) {
2897                          viewFlagValues |= VISIBILITY_FLAGS[visibility];
2898                          viewFlagMasks |= VISIBILITY_MASK;
2899                      }
2900                      break;
2901                  case com.android.internal.R.styleable.View_layoutDirection:
2902                      // Clear any HORIZONTAL_DIRECTION flag already set
2903                      viewFlagValues &= ~LAYOUT_DIRECTION_MASK;
2904                      // Set the HORIZONTAL_DIRECTION flags depending on the value of the attribute
2905                      final int layoutDirection = a.getInt(attr, -1);
2906                      if (layoutDirection != -1) {
2907                          viewFlagValues |= LAYOUT_DIRECTION_FLAGS[layoutDirection];
2908                      } else {
2909                          // Set to default (LAYOUT_DIRECTION_INHERIT)
2910                          viewFlagValues |= LAYOUT_DIRECTION_DEFAULT;
2911                      }
2912                      viewFlagMasks |= LAYOUT_DIRECTION_MASK;
2913                      break;
2914                  case com.android.internal.R.styleable.View_drawingCacheQuality:
2915                      final int cacheQuality = a.getInt(attr, 0);
2916                      if (cacheQuality != 0) {
2917                          viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality];
2918                          viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK;
2919                      }
2920                      break;
2921                  case com.android.internal.R.styleable.View_contentDescription:
2922                      mContentDescription = a.getString(attr);
2923                      break;
2924                  case com.android.internal.R.styleable.View_soundEffectsEnabled:
2925                      if (!a.getBoolean(attr, true)) {
2926                          viewFlagValues &= ~SOUND_EFFECTS_ENABLED;
2927                          viewFlagMasks |= SOUND_EFFECTS_ENABLED;
2928                      }
2929                      break;
2930                  case com.android.internal.R.styleable.View_hapticFeedbackEnabled:
2931                      if (!a.getBoolean(attr, true)) {
2932                          viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED;
2933                          viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED;
2934                      }
2935                      break;
2936                  case R.styleable.View_scrollbars:
2937                      final int scrollbars = a.getInt(attr, SCROLLBARS_NONE);
2938                      if (scrollbars != SCROLLBARS_NONE) {
2939                          viewFlagValues |= scrollbars;
2940                          viewFlagMasks |= SCROLLBARS_MASK;
2941                          initializeScrollbars(a);
2942                      }
2943                      break;
2944                  //noinspection deprecation
2945                  case R.styleable.View_fadingEdge:
2946                      if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) {
2947                          // Ignore the attribute starting with ICS
2948                          break;
2949                      }
2950                      // With builds < ICS, fall through and apply fading edges
2951                  case R.styleable.View_requiresFadingEdge:
2952                      final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE);
2953                      if (fadingEdge != FADING_EDGE_NONE) {
2954                          viewFlagValues |= fadingEdge;
2955                          viewFlagMasks |= FADING_EDGE_MASK;
2956                          initializeFadingEdge(a);
2957                      }
2958                      break;
2959                  case R.styleable.View_scrollbarStyle:
2960                      scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY);
2961                      if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) {
2962                          viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK;
2963                          viewFlagMasks |= SCROLLBARS_STYLE_MASK;
2964                      }
2965                      break;
2966                  case R.styleable.View_isScrollContainer:
2967                      setScrollContainer = true;
2968                      if (a.getBoolean(attr, false)) {
2969                          setScrollContainer(true);
2970                      }
2971                      break;
2972                  case com.android.internal.R.styleable.View_keepScreenOn:
2973                      if (a.getBoolean(attr, false)) {
2974                          viewFlagValues |= KEEP_SCREEN_ON;
2975                          viewFlagMasks |= KEEP_SCREEN_ON;
2976                      }
2977                      break;
2978                  case R.styleable.View_filterTouchesWhenObscured:
2979                      if (a.getBoolean(attr, false)) {
2980                          viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED;
2981                          viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED;
2982                      }
2983                      break;
2984                  case R.styleable.View_nextFocusLeft:
2985                      mNextFocusLeftId = a.getResourceId(attr, View.NO_ID);
2986                      break;
2987                  case R.styleable.View_nextFocusRight:
2988                      mNextFocusRightId = a.getResourceId(attr, View.NO_ID);
2989                      break;
2990                  case R.styleable.View_nextFocusUp:
2991                      mNextFocusUpId = a.getResourceId(attr, View.NO_ID);
2992                      break;
2993                  case R.styleable.View_nextFocusDown:
2994                      mNextFocusDownId = a.getResourceId(attr, View.NO_ID);
2995                      break;
2996                  case R.styleable.View_nextFocusForward:
2997                      mNextFocusForwardId = a.getResourceId(attr, View.NO_ID);
2998                      break;
2999                  case R.styleable.View_minWidth:
3000                      mMinWidth = a.getDimensionPixelSize(attr, 0);
3001                      break;
3002                  case R.styleable.View_minHeight:
3003                      mMinHeight = a.getDimensionPixelSize(attr, 0);
3004                      break;
3005                  case R.styleable.View_onClick:
3006                      if (context.isRestricted()) {
3007                          throw new IllegalStateException("The android:onClick attribute cannot "
3008                                  + "be used within a restricted context");
3009                      }
3010  
3011                      final String handlerName = a.getString(attr);
3012                      if (handlerName != null) {
3013                          setOnClickListener(new OnClickListener() {
3014                              private Method mHandler;
3015  
3016                              public void onClick(View v) {
3017                                  if (mHandler == null) {
3018                                      try {
3019                                          mHandler = getContext().getClass().getMethod(handlerName,
3020                                                  View.class);
3021                                      } catch (NoSuchMethodException e) {
3022                                          int id = getId();
3023                                          String idText = id == NO_ID ? "" : " with id '"
3024                                                  + getContext().getResources().getResourceEntryName(
3025                                                      id) + "'";
3026                                          throw new IllegalStateException("Could not find a method " +
3027                                                  handlerName + "(View) in the activity "
3028                                                  + getContext().getClass() + " for onClick handler"
3029                                                  + " on view " + View.this.getClass() + idText, e);
3030                                      }
3031                                  }
3032  
3033                                  try {
3034                                      mHandler.invoke(getContext(), View.this);
3035                                  } catch (IllegalAccessException e) {
3036                                      throw new IllegalStateException("Could not execute non "
3037                                              + "public method of the activity", e);
3038                                  } catch (InvocationTargetException e) {
3039                                      throw new IllegalStateException("Could not execute "
3040                                              + "method of the activity", e);
3041                                  }
3042                              }
3043                          });
3044                      }
3045                      break;
3046                  case R.styleable.View_overScrollMode:
3047                      overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS);
3048                      break;
3049                  case R.styleable.View_verticalScrollbarPosition:
3050                      mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT);
3051                      break;
3052                  case R.styleable.View_layerType:
3053                      setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null);
3054                      break;
3055                  case R.styleable.View_textDirection:
3056                      mTextDirection = a.getInt(attr, DEFAULT_TEXT_DIRECTION);
3057                      break;
3058              }
3059          }
3060  
3061          a.recycle();
3062  
3063          setOverScrollMode(overScrollMode);
3064  
3065          if (background != null) {
3066              setBackgroundDrawable(background);
3067          }
3068  
3069          mUserPaddingRelative = (startPadding >= 0 || endPadding >= 0);
3070  
3071          // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved
3072          // layout direction). Those cached values will be used later during padding resolution.
3073          mUserPaddingStart = startPadding;
3074          mUserPaddingEnd = endPadding;
3075  
3076          if (padding >= 0) {
3077              leftPadding = padding;
3078              topPadding = padding;
3079              rightPadding = padding;
3080              bottomPadding = padding;
3081          }
3082  
3083          // If the user specified the padding (either with android:padding or
3084          // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise
3085          // use the default padding or the padding from the background drawable
3086          // (stored at this point in mPadding*)
3087          setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft,
3088                  topPadding >= 0 ? topPadding : mPaddingTop,
3089                  rightPadding >= 0 ? rightPadding : mPaddingRight,
3090                  bottomPadding >= 0 ? bottomPadding : mPaddingBottom);
3091  
3092          if (viewFlagMasks != 0) {
3093              setFlags(viewFlagValues, viewFlagMasks);
3094          }
3095  
3096          // Needs to be called after mViewFlags is set
3097          if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) {
3098              recomputePadding();
3099          }
3100  
3101          if (x != 0 || y != 0) {
3102              scrollTo(x, y);
3103          }
3104  
3105          if (transformSet) {
3106              setTranslationX(tx);
3107              setTranslationY(ty);
3108              setRotation(rotation);
3109              setRotationX(rotationX);
3110              setRotationY(rotationY);
3111              setScaleX(sx);
3112              setScaleY(sy);
3113          }
3114  
3115          if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) {
3116              setScrollContainer(true);
3117          }
3118  
3119          computeOpaqueFlags();
3120      }
3121  
3122      /**
3123       * Non-public constructor for use in testing
3124       */
View()3125      View() {
3126          mResources = null;
3127      }
3128  
3129      /**
3130       * <p>
3131       * Initializes the fading edges from a given set of styled attributes. This
3132       * method should be called by subclasses that need fading edges and when an
3133       * instance of these subclasses is created programmatically rather than
3134       * being inflated from XML. This method is automatically called when the XML
3135       * is inflated.
3136       * </p>
3137       *
3138       * @param a the styled attributes set to initialize the fading edges from
3139       */
initializeFadingEdge(TypedArray a)3140      protected void initializeFadingEdge(TypedArray a) {
3141          initScrollCache();
3142  
3143          mScrollCache.fadingEdgeLength = a.getDimensionPixelSize(
3144                  R.styleable.View_fadingEdgeLength,
3145                  ViewConfiguration.get(mContext).getScaledFadingEdgeLength());
3146      }
3147  
3148      /**
3149       * Returns the size of the vertical faded edges used to indicate that more
3150       * content in this view is visible.
3151       *
3152       * @return The size in pixels of the vertical faded edge or 0 if vertical
3153       *         faded edges are not enabled for this view.
3154       * @attr ref android.R.styleable#View_fadingEdgeLength
3155       */
getVerticalFadingEdgeLength()3156      public int getVerticalFadingEdgeLength() {
3157          if (isVerticalFadingEdgeEnabled()) {
3158              ScrollabilityCache cache = mScrollCache;
3159              if (cache != null) {
3160                  return cache.fadingEdgeLength;
3161              }
3162          }
3163          return 0;
3164      }
3165  
3166      /**
3167       * Set the size of the faded edge used to indicate that more content in this
3168       * view is available.  Will not change whether the fading edge is enabled; use
3169       * {@link #setVerticalFadingEdgeEnabled(boolean)} or
3170       * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge
3171       * for the vertical or horizontal fading edges.
3172       *
3173       * @param length The size in pixels of the faded edge used to indicate that more
3174       *        content in this view is visible.
3175       */
setFadingEdgeLength(int length)3176      public void setFadingEdgeLength(int length) {
3177          initScrollCache();
3178          mScrollCache.fadingEdgeLength = length;
3179      }
3180  
3181      /**
3182       * Returns the size of the horizontal faded edges used to indicate that more
3183       * content in this view is visible.
3184       *
3185       * @return The size in pixels of the horizontal faded edge or 0 if horizontal
3186       *         faded edges are not enabled for this view.
3187       * @attr ref android.R.styleable#View_fadingEdgeLength
3188       */
getHorizontalFadingEdgeLength()3189      public int getHorizontalFadingEdgeLength() {
3190          if (isHorizontalFadingEdgeEnabled()) {
3191              ScrollabilityCache cache = mScrollCache;
3192              if (cache != null) {
3193                  return cache.fadingEdgeLength;
3194              }
3195          }
3196          return 0;
3197      }
3198  
3199      /**
3200       * Returns the width of the vertical scrollbar.
3201       *
3202       * @return The width in pixels of the vertical scrollbar or 0 if there
3203       *         is no vertical scrollbar.
3204       */
getVerticalScrollbarWidth()3205      public int getVerticalScrollbarWidth() {
3206          ScrollabilityCache cache = mScrollCache;
3207          if (cache != null) {
3208              ScrollBarDrawable scrollBar = cache.scrollBar;
3209              if (scrollBar != null) {
3210                  int size = scrollBar.getSize(true);
3211                  if (size <= 0) {
3212                      size = cache.scrollBarSize;
3213                  }
3214                  return size;
3215              }
3216              return 0;
3217          }
3218          return 0;
3219      }
3220  
3221      /**
3222       * Returns the height of the horizontal scrollbar.
3223       *
3224       * @return The height in pixels of the horizontal scrollbar or 0 if
3225       *         there is no horizontal scrollbar.
3226       */
getHorizontalScrollbarHeight()3227      protected int getHorizontalScrollbarHeight() {
3228          ScrollabilityCache cache = mScrollCache;
3229          if (cache != null) {
3230              ScrollBarDrawable scrollBar = cache.scrollBar;
3231              if (scrollBar != null) {
3232                  int size = scrollBar.getSize(false);
3233                  if (size <= 0) {
3234                      size = cache.scrollBarSize;
3235                  }
3236                  return size;
3237              }
3238              return 0;
3239          }
3240          return 0;
3241      }
3242  
3243      /**
3244       * <p>
3245       * Initializes the scrollbars from a given set of styled attributes. This
3246       * method should be called by subclasses that need scrollbars and when an
3247       * instance of these subclasses is created programmatically rather than
3248       * being inflated from XML. This method is automatically called when the XML
3249       * is inflated.
3250       * </p>
3251       *
3252       * @param a the styled attributes set to initialize the scrollbars from
3253       */
initializeScrollbars(TypedArray a)3254      protected void initializeScrollbars(TypedArray a) {
3255          initScrollCache();
3256  
3257          final ScrollabilityCache scrollabilityCache = mScrollCache;
3258  
3259          if (scrollabilityCache.scrollBar == null) {
3260              scrollabilityCache.scrollBar = new ScrollBarDrawable();
3261          }
3262  
3263          final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true);
3264  
3265          if (!fadeScrollbars) {
3266              scrollabilityCache.state = ScrollabilityCache.ON;
3267          }
3268          scrollabilityCache.fadeScrollBars = fadeScrollbars;
3269  
3270  
3271          scrollabilityCache.scrollBarFadeDuration = a.getInt(
3272                  R.styleable.View_scrollbarFadeDuration, ViewConfiguration
3273                          .getScrollBarFadeDuration());
3274          scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt(
3275                  R.styleable.View_scrollbarDefaultDelayBeforeFade,
3276                  ViewConfiguration.getScrollDefaultDelay());
3277  
3278  
3279          scrollabilityCache.scrollBarSize = a.getDimensionPixelSize(
3280                  com.android.internal.R.styleable.View_scrollbarSize,
3281                  ViewConfiguration.get(mContext).getScaledScrollBarSize());
3282  
3283          Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal);
3284          scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track);
3285  
3286          Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal);
3287          if (thumb != null) {
3288              scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb);
3289          }
3290  
3291          boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack,
3292                  false);
3293          if (alwaysDraw) {
3294              scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true);
3295          }
3296  
3297          track = a.getDrawable(R.styleable.View_scrollbarTrackVertical);
3298          scrollabilityCache.scrollBar.setVerticalTrackDrawable(track);
3299  
3300          thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical);
3301          if (thumb != null) {
3302              scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb);
3303          }
3304  
3305          alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack,
3306                  false);
3307          if (alwaysDraw) {
3308              scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true);
3309          }
3310  
3311          // Re-apply user/background padding so that scrollbar(s) get added
3312          resolvePadding();
3313      }
3314  
3315      /**
3316       * <p>
3317       * Initalizes the scrollability cache if necessary.
3318       * </p>
3319       */
initScrollCache()3320      private void initScrollCache() {
3321          if (mScrollCache == null) {
3322              mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this);
3323          }
3324      }
3325  
3326      /**
3327       * Set the position of the vertical scroll bar. Should be one of
3328       * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or
3329       * {@link #SCROLLBAR_POSITION_RIGHT}.
3330       *
3331       * @param position Where the vertical scroll bar should be positioned.
3332       */
setVerticalScrollbarPosition(int position)3333      public void setVerticalScrollbarPosition(int position) {
3334          if (mVerticalScrollbarPosition != position) {
3335              mVerticalScrollbarPosition = position;
3336              computeOpaqueFlags();
3337              resolvePadding();
3338          }
3339      }
3340  
3341      /**
3342       * @return The position where the vertical scroll bar will show, if applicable.
3343       * @see #setVerticalScrollbarPosition(int)
3344       */
getVerticalScrollbarPosition()3345      public int getVerticalScrollbarPosition() {
3346          return mVerticalScrollbarPosition;
3347      }
3348  
3349      /**
3350       * Register a callback to be invoked when focus of this view changed.
3351       *
3352       * @param l The callback that will run.
3353       */
setOnFocusChangeListener(OnFocusChangeListener l)3354      public void setOnFocusChangeListener(OnFocusChangeListener l) {
3355          mOnFocusChangeListener = l;
3356      }
3357  
3358      /**
3359       * Add a listener that will be called when the bounds of the view change due to
3360       * layout processing.
3361       *
3362       * @param listener The listener that will be called when layout bounds change.
3363       */
addOnLayoutChangeListener(OnLayoutChangeListener listener)3364      public void addOnLayoutChangeListener(OnLayoutChangeListener listener) {
3365          if (mOnLayoutChangeListeners == null) {
3366              mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>();
3367          }
3368          if (!mOnLayoutChangeListeners.contains(listener)) {
3369              mOnLayoutChangeListeners.add(listener);
3370          }
3371      }
3372  
3373      /**
3374       * Remove a listener for layout changes.
3375       *
3376       * @param listener The listener for layout bounds change.
3377       */
removeOnLayoutChangeListener(OnLayoutChangeListener listener)3378      public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) {
3379          if (mOnLayoutChangeListeners == null) {
3380              return;
3381          }
3382          mOnLayoutChangeListeners.remove(listener);
3383      }
3384  
3385      /**
3386       * Add a listener for attach state changes.
3387       *
3388       * This listener will be called whenever this view is attached or detached
3389       * from a window. Remove the listener using
3390       * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}.
3391       *
3392       * @param listener Listener to attach
3393       * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener)
3394       */
addOnAttachStateChangeListener(OnAttachStateChangeListener listener)3395      public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) {
3396          if (mOnAttachStateChangeListeners == null) {
3397              mOnAttachStateChangeListeners = new CopyOnWriteArrayList<OnAttachStateChangeListener>();
3398          }
3399          mOnAttachStateChangeListeners.add(listener);
3400      }
3401  
3402      /**
3403       * Remove a listener for attach state changes. The listener will receive no further
3404       * notification of window attach/detach events.
3405       *
3406       * @param listener Listener to remove
3407       * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener)
3408       */
removeOnAttachStateChangeListener(OnAttachStateChangeListener listener)3409      public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) {
3410          if (mOnAttachStateChangeListeners == null) {
3411              return;
3412          }
3413          mOnAttachStateChangeListeners.remove(listener);
3414      }
3415  
3416      /**
3417       * Returns the focus-change callback registered for this view.
3418       *
3419       * @return The callback, or null if one is not registered.
3420       */
getOnFocusChangeListener()3421      public OnFocusChangeListener getOnFocusChangeListener() {
3422          return mOnFocusChangeListener;
3423      }
3424  
3425      /**
3426       * Register a callback to be invoked when this view is clicked. If this view is not
3427       * clickable, it becomes clickable.
3428       *
3429       * @param l The callback that will run
3430       *
3431       * @see #setClickable(boolean)
3432       */
setOnClickListener(OnClickListener l)3433      public void setOnClickListener(OnClickListener l) {
3434          if (!isClickable()) {
3435              setClickable(true);
3436          }
3437          mOnClickListener = l;
3438      }
3439  
3440      /**
3441       * Register a callback to be invoked when this view is clicked and held. If this view is not
3442       * long clickable, it becomes long clickable.
3443       *
3444       * @param l The callback that will run
3445       *
3446       * @see #setLongClickable(boolean)
3447       */
setOnLongClickListener(OnLongClickListener l)3448      public void setOnLongClickListener(OnLongClickListener l) {
3449          if (!isLongClickable()) {
3450              setLongClickable(true);
3451          }
3452          mOnLongClickListener = l;
3453      }
3454  
3455      /**
3456       * Register a callback to be invoked when the context menu for this view is
3457       * being built. If this view is not long clickable, it becomes long clickable.
3458       *
3459       * @param l The callback that will run
3460       *
3461       */
setOnCreateContextMenuListener(OnCreateContextMenuListener l)3462      public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) {
3463          if (!isLongClickable()) {
3464              setLongClickable(true);
3465          }
3466          mOnCreateContextMenuListener = l;
3467      }
3468  
3469      /**
3470       * Call this view's OnClickListener, if it is defined.
3471       *
3472       * @return True there was an assigned OnClickListener that was called, false
3473       *         otherwise is returned.
3474       */
performClick()3475      public boolean performClick() {
3476          sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
3477  
3478          if (mOnClickListener != null) {
3479              playSoundEffect(SoundEffectConstants.CLICK);
3480              mOnClickListener.onClick(this);
3481              return true;
3482          }
3483  
3484          return false;
3485      }
3486  
3487      /**
3488       * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the
3489       * OnLongClickListener did not consume the event.
3490       *
3491       * @return True if one of the above receivers consumed the event, false otherwise.
3492       */
performLongClick()3493      public boolean performLongClick() {
3494          sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
3495  
3496          boolean handled = false;
3497          if (mOnLongClickListener != null) {
3498              handled = mOnLongClickListener.onLongClick(View.this);
3499          }
3500          if (!handled) {
3501              handled = showContextMenu();
3502          }
3503          if (handled) {
3504              performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
3505          }
3506          return handled;
3507      }
3508  
3509      /**
3510       * Performs button-related actions during a touch down event.
3511       *
3512       * @param event The event.
3513       * @return True if the down was consumed.
3514       *
3515       * @hide
3516       */
performButtonActionOnTouchDown(MotionEvent event)3517      protected boolean performButtonActionOnTouchDown(MotionEvent event) {
3518          if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) {
3519              if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) {
3520                  return true;
3521              }
3522          }
3523          return false;
3524      }
3525  
3526      /**
3527       * Bring up the context menu for this view.
3528       *
3529       * @return Whether a context menu was displayed.
3530       */
showContextMenu()3531      public boolean showContextMenu() {
3532          return getParent().showContextMenuForChild(this);
3533      }
3534  
3535      /**
3536       * Bring up the context menu for this view, referring to the item under the specified point.
3537       *
3538       * @param x The referenced x coordinate.
3539       * @param y The referenced y coordinate.
3540       * @param metaState The keyboard modifiers that were pressed.
3541       * @return Whether a context menu was displayed.
3542       *
3543       * @hide
3544       */
showContextMenu(float x, float y, int metaState)3545      public boolean showContextMenu(float x, float y, int metaState) {
3546          return showContextMenu();
3547      }
3548  
3549      /**
3550       * Start an action mode.
3551       *
3552       * @param callback Callback that will control the lifecycle of the action mode
3553       * @return The new action mode if it is started, null otherwise
3554       *
3555       * @see ActionMode
3556       */
startActionMode(ActionMode.Callback callback)3557      public ActionMode startActionMode(ActionMode.Callback callback) {
3558          return getParent().startActionModeForChild(this, callback);
3559      }
3560  
3561      /**
3562       * Register a callback to be invoked when a key is pressed in this view.
3563       * @param l the key listener to attach to this view
3564       */
setOnKeyListener(OnKeyListener l)3565      public void setOnKeyListener(OnKeyListener l) {
3566          mOnKeyListener = l;
3567      }
3568  
3569      /**
3570       * Register a callback to be invoked when a touch event is sent to this view.
3571       * @param l the touch listener to attach to this view
3572       */
setOnTouchListener(OnTouchListener l)3573      public void setOnTouchListener(OnTouchListener l) {
3574          mOnTouchListener = l;
3575      }
3576  
3577      /**
3578       * Register a callback to be invoked when a generic motion event is sent to this view.
3579       * @param l the generic motion listener to attach to this view
3580       */
setOnGenericMotionListener(OnGenericMotionListener l)3581      public void setOnGenericMotionListener(OnGenericMotionListener l) {
3582          mOnGenericMotionListener = l;
3583      }
3584  
3585      /**
3586       * Register a callback to be invoked when a hover event is sent to this view.
3587       * @param l the hover listener to attach to this view
3588       */
setOnHoverListener(OnHoverListener l)3589      public void setOnHoverListener(OnHoverListener l) {
3590          mOnHoverListener = l;
3591      }
3592  
3593      /**
3594       * Register a drag event listener callback object for this View. The parameter is
3595       * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a
3596       * View, the system calls the
3597       * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method.
3598       * @param l An implementation of {@link android.view.View.OnDragListener}.
3599       */
setOnDragListener(OnDragListener l)3600      public void setOnDragListener(OnDragListener l) {
3601          mOnDragListener = l;
3602      }
3603  
3604      /**
3605       * Give this view focus. This will cause
3606       * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called.
3607       *
3608       * Note: this does not check whether this {@link View} should get focus, it just
3609       * gives it focus no matter what.  It should only be called internally by framework
3610       * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}.
3611       *
3612       * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN},
3613       *        {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which
3614       *        focus moved when requestFocus() is called. It may not always
3615       *        apply, in which case use the default View.FOCUS_DOWN.
3616       * @param previouslyFocusedRect The rectangle of the view that had focus
3617       *        prior in this View's coordinate system.
3618       */
handleFocusGainInternal(int direction, Rect previouslyFocusedRect)3619      void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) {
3620          if (DBG) {
3621              System.out.println(this + " requestFocus()");
3622          }
3623  
3624          if ((mPrivateFlags & FOCUSED) == 0) {
3625              mPrivateFlags |= FOCUSED;
3626  
3627              if (mParent != null) {
3628                  mParent.requestChildFocus(this, this);
3629              }
3630  
3631              onFocusChanged(true, direction, previouslyFocusedRect);
3632              refreshDrawableState();
3633          }
3634      }
3635  
3636      /**
3637       * Request that a rectangle of this view be visible on the screen,
3638       * scrolling if necessary just enough.
3639       *
3640       * <p>A View should call this if it maintains some notion of which part
3641       * of its content is interesting.  For example, a text editing view
3642       * should call this when its cursor moves.
3643       *
3644       * @param rectangle The rectangle.
3645       * @return Whether any parent scrolled.
3646       */
requestRectangleOnScreen(Rect rectangle)3647      public boolean requestRectangleOnScreen(Rect rectangle) {
3648          return requestRectangleOnScreen(rectangle, false);
3649      }
3650  
3651      /**
3652       * Request that a rectangle of this view be visible on the screen,
3653       * scrolling if necessary just enough.
3654       *
3655       * <p>A View should call this if it maintains some notion of which part
3656       * of its content is interesting.  For example, a text editing view
3657       * should call this when its cursor moves.
3658       *
3659       * <p>When <code>immediate</code> is set to true, scrolling will not be
3660       * animated.
3661       *
3662       * @param rectangle The rectangle.
3663       * @param immediate True to forbid animated scrolling, false otherwise
3664       * @return Whether any parent scrolled.
3665       */
requestRectangleOnScreen(Rect rectangle, boolean immediate)3666      public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) {
3667          View child = this;
3668          ViewParent parent = mParent;
3669          boolean scrolled = false;
3670          while (parent != null) {
3671              scrolled |= parent.requestChildRectangleOnScreen(child,
3672                      rectangle, immediate);
3673  
3674              // offset rect so next call has the rectangle in the
3675              // coordinate system of its direct child.
3676              rectangle.offset(child.getLeft(), child.getTop());
3677              rectangle.offset(-child.getScrollX(), -child.getScrollY());
3678  
3679              if (!(parent instanceof View)) {
3680                  break;
3681              }
3682  
3683              child = (View) parent;
3684              parent = child.getParent();
3685          }
3686          return scrolled;
3687      }
3688  
3689      /**
3690       * Called when this view wants to give up focus. This will cause
3691       * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called.
3692       */
clearFocus()3693      public void clearFocus() {
3694          if (DBG) {
3695              System.out.println(this + " clearFocus()");
3696          }
3697  
3698          if ((mPrivateFlags & FOCUSED) != 0) {
3699              mPrivateFlags &= ~FOCUSED;
3700  
3701              if (mParent != null) {
3702                  mParent.clearChildFocus(this);
3703              }
3704  
3705              onFocusChanged(false, 0, null);
3706              refreshDrawableState();
3707          }
3708      }
3709  
3710      /**
3711       * Called to clear the focus of a view that is about to be removed.
3712       * Doesn't call clearChildFocus, which prevents this view from taking
3713       * focus again before it has been removed from the parent
3714       */
clearFocusForRemoval()3715      void clearFocusForRemoval() {
3716          if ((mPrivateFlags & FOCUSED) != 0) {
3717              mPrivateFlags &= ~FOCUSED;
3718  
3719              onFocusChanged(false, 0, null);
3720              refreshDrawableState();
3721          }
3722      }
3723  
3724      /**
3725       * Called internally by the view system when a new view is getting focus.
3726       * This is what clears the old focus.
3727       */
unFocus()3728      void unFocus() {
3729          if (DBG) {
3730              System.out.println(this + " unFocus()");
3731          }
3732  
3733          if ((mPrivateFlags & FOCUSED) != 0) {
3734              mPrivateFlags &= ~FOCUSED;
3735  
3736              onFocusChanged(false, 0, null);
3737              refreshDrawableState();
3738          }
3739      }
3740  
3741      /**
3742       * Returns true if this view has focus iteself, or is the ancestor of the
3743       * view that has focus.
3744       *
3745       * @return True if this view has or contains focus, false otherwise.
3746       */
3747      @ViewDebug.ExportedProperty(category = "focus")
hasFocus()3748      public boolean hasFocus() {
3749          return (mPrivateFlags & FOCUSED) != 0;
3750      }
3751  
3752      /**
3753       * Returns true if this view is focusable or if it contains a reachable View
3754       * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()"
3755       * is a View whose parents do not block descendants focus.
3756       *
3757       * Only {@link #VISIBLE} views are considered focusable.
3758       *
3759       * @return True if the view is focusable or if the view contains a focusable
3760       *         View, false otherwise.
3761       *
3762       * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS
3763       */
hasFocusable()3764      public boolean hasFocusable() {
3765          return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable();
3766      }
3767  
3768      /**
3769       * Called by the view system when the focus state of this view changes.
3770       * When the focus change event is caused by directional navigation, direction
3771       * and previouslyFocusedRect provide insight into where the focus is coming from.
3772       * When overriding, be sure to call up through to the super class so that
3773       * the standard focus handling will occur.
3774       *
3775       * @param gainFocus True if the View has focus; false otherwise.
3776       * @param direction The direction focus has moved when requestFocus()
3777       *                  is called to give this view focus. Values are
3778       *                  {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT},
3779       *                  {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}.
3780       *                  It may not always apply, in which case use the default.
3781       * @param previouslyFocusedRect The rectangle, in this view's coordinate
3782       *        system, of the previously focused view.  If applicable, this will be
3783       *        passed in as finer grained information about where the focus is coming
3784       *        from (in addition to direction).  Will be <code>null</code> otherwise.
3785       */
onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect)3786      protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
3787          if (gainFocus) {
3788              sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
3789          }
3790  
3791          InputMethodManager imm = InputMethodManager.peekInstance();
3792          if (!gainFocus) {
3793              if (isPressed()) {
3794                  setPressed(false);
3795              }
3796              if (imm != null && mAttachInfo != null
3797                      && mAttachInfo.mHasWindowFocus) {
3798                  imm.focusOut(this);
3799              }
3800              onFocusLost();
3801          } else if (imm != null && mAttachInfo != null
3802                  && mAttachInfo.mHasWindowFocus) {
3803              imm.focusIn(this);
3804          }
3805  
3806          invalidate(true);
3807          if (mOnFocusChangeListener != null) {
3808              mOnFocusChangeListener.onFocusChange(this, gainFocus);
3809          }
3810  
3811          if (mAttachInfo != null) {
3812              mAttachInfo.mKeyDispatchState.reset(this);
3813          }
3814      }
3815  
3816      /**
3817       * Sends an accessibility event of the given type. If accessiiblity is
3818       * not enabled this method has no effect. The default implementation calls
3819       * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first
3820       * to populate information about the event source (this View), then calls
3821       * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to
3822       * populate the text content of the event source including its descendants,
3823       * and last calls
3824       * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)}
3825       * on its parent to resuest sending of the event to interested parties.
3826       * <p>
3827       * If an {@link AccessibilityDelegate} has been specified via calling
3828       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
3829       * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is
3830       * responsible for handling this call.
3831       * </p>
3832       *
3833       * @param eventType The type of the event to send, as defined by several types from
3834       * {@link android.view.accessibility.AccessibilityEvent}, such as
3835       * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or
3836       * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}.
3837       *
3838       * @see #onInitializeAccessibilityEvent(AccessibilityEvent)
3839       * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
3840       * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)
3841       * @see AccessibilityDelegate
3842       */
sendAccessibilityEvent(int eventType)3843      public void sendAccessibilityEvent(int eventType) {
3844          if (mAccessibilityDelegate != null) {
3845              mAccessibilityDelegate.sendAccessibilityEvent(this, eventType);
3846          } else {
3847              sendAccessibilityEventInternal(eventType);
3848          }
3849      }
3850  
3851      /**
3852       * @see #sendAccessibilityEvent(int)
3853       *
3854       * Note: Called from the default {@link AccessibilityDelegate}.
3855       */
sendAccessibilityEventInternal(int eventType)3856      void sendAccessibilityEventInternal(int eventType) {
3857          if (AccessibilityManager.getInstance(mContext).isEnabled()) {
3858              sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType));
3859          }
3860      }
3861  
3862      /**
3863       * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but
3864       * takes as an argument an empty {@link AccessibilityEvent} and does not
3865       * perform a check whether accessibility is enabled.
3866       * <p>
3867       * If an {@link AccessibilityDelegate} has been specified via calling
3868       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
3869       * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)}
3870       * is responsible for handling this call.
3871       * </p>
3872       *
3873       * @param event The event to send.
3874       *
3875       * @see #sendAccessibilityEvent(int)
3876       */
sendAccessibilityEventUnchecked(AccessibilityEvent event)3877      public void sendAccessibilityEventUnchecked(AccessibilityEvent event) {
3878          if (mAccessibilityDelegate != null) {
3879             mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event);
3880          } else {
3881              sendAccessibilityEventUncheckedInternal(event);
3882          }
3883      }
3884  
3885      /**
3886       * @see #sendAccessibilityEventUnchecked(AccessibilityEvent)
3887       *
3888       * Note: Called from the default {@link AccessibilityDelegate}.
3889       */
sendAccessibilityEventUncheckedInternal(AccessibilityEvent event)3890      void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) {
3891          if (!isShown()) {
3892              return;
3893          }
3894          onInitializeAccessibilityEvent(event);
3895          // Only a subset of accessibility events populates text content.
3896          if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) {
3897              dispatchPopulateAccessibilityEvent(event);
3898          }
3899          // In the beginning we called #isShown(), so we know that getParent() is not null.
3900          getParent().requestSendAccessibilityEvent(this, event);
3901      }
3902  
3903      /**
3904       * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then
3905       * to its children for adding their text content to the event. Note that the
3906       * event text is populated in a separate dispatch path since we add to the
3907       * event not only the text of the source but also the text of all its descendants.
3908       * A typical implementation will call
3909       * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view
3910       * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)}
3911       * on each child. Override this method if custom population of the event text
3912       * content is required.
3913       * <p>
3914       * If an {@link AccessibilityDelegate} has been specified via calling
3915       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
3916       * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)}
3917       * is responsible for handling this call.
3918       * </p>
3919       * <p>
3920       * <em>Note:</em> Accessibility events of certain types are not dispatched for
3921       * populating the event text via this method. For details refer to {@link AccessibilityEvent}.
3922       * </p>
3923       *
3924       * @param event The event.
3925       *
3926       * @return True if the event population was completed.
3927       */
dispatchPopulateAccessibilityEvent(AccessibilityEvent event)3928      public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
3929          if (mAccessibilityDelegate != null) {
3930              return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event);
3931          } else {
3932              return dispatchPopulateAccessibilityEventInternal(event);
3933          }
3934      }
3935  
3936      /**
3937       * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
3938       *
3939       * Note: Called from the default {@link AccessibilityDelegate}.
3940       */
dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event)3941      boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) {
3942          onPopulateAccessibilityEvent(event);
3943          return false;
3944      }
3945  
3946      /**
3947       * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)}
3948       * giving a chance to this View to populate the accessibility event with its
3949       * text content. While this method is free to modify event
3950       * attributes other than text content, doing so should normally be performed in
3951       * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}.
3952       * <p>
3953       * Example: Adding formatted date string to an accessibility event in addition
3954       *          to the text added by the super implementation:
3955       * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
3956       *     super.onPopulateAccessibilityEvent(event);
3957       *     final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY;
3958       *     String selectedDateUtterance = DateUtils.formatDateTime(mContext,
3959       *         mCurrentDate.getTimeInMillis(), flags);
3960       *     event.getText().add(selectedDateUtterance);
3961       * }</pre>
3962       * <p>
3963       * If an {@link AccessibilityDelegate} has been specified via calling
3964       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
3965       * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)}
3966       * is responsible for handling this call.
3967       * </p>
3968       * <p class="note"><strong>Note:</strong> Always call the super implementation before adding
3969       * information to the event, in case the default implementation has basic information to add.
3970       * </p>
3971       *
3972       * @param event The accessibility event which to populate.
3973       *
3974       * @see #sendAccessibilityEvent(int)
3975       * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
3976       */
onPopulateAccessibilityEvent(AccessibilityEvent event)3977      public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
3978          if (mAccessibilityDelegate != null) {
3979              mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event);
3980          } else {
3981              onPopulateAccessibilityEventInternal(event);
3982          }
3983      }
3984  
3985      /**
3986       * @see #onPopulateAccessibilityEvent(AccessibilityEvent)
3987       *
3988       * Note: Called from the default {@link AccessibilityDelegate}.
3989       */
onPopulateAccessibilityEventInternal(AccessibilityEvent event)3990      void onPopulateAccessibilityEventInternal(AccessibilityEvent event) {
3991  
3992      }
3993  
3994      /**
3995       * Initializes an {@link AccessibilityEvent} with information about
3996       * this View which is the event source. In other words, the source of
3997       * an accessibility event is the view whose state change triggered firing
3998       * the event.
3999       * <p>
4000       * Example: Setting the password property of an event in addition
4001       *          to properties set by the super implementation:
4002       * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
4003       *     super.onInitializeAccessibilityEvent(event);
4004       *     event.setPassword(true);
4005       * }</pre>
4006       * <p>
4007       * If an {@link AccessibilityDelegate} has been specified via calling
4008       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
4009       * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)}
4010       * is responsible for handling this call.
4011       * </p>
4012       * <p class="note"><strong>Note:</strong> Always call the super implementation before adding
4013       * information to the event, in case the default implementation has basic information to add.
4014       * </p>
4015       * @param event The event to initialize.
4016       *
4017       * @see #sendAccessibilityEvent(int)
4018       * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
4019       */
onInitializeAccessibilityEvent(AccessibilityEvent event)4020      public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
4021          if (mAccessibilityDelegate != null) {
4022              mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event);
4023          } else {
4024              onInitializeAccessibilityEventInternal(event);
4025          }
4026      }
4027  
4028      /**
4029       * @see #onInitializeAccessibilityEvent(AccessibilityEvent)
4030       *
4031       * Note: Called from the default {@link AccessibilityDelegate}.
4032       */
onInitializeAccessibilityEventInternal(AccessibilityEvent event)4033      void onInitializeAccessibilityEventInternal(AccessibilityEvent event) {
4034          event.setSource(this);
4035          event.setClassName(getClass().getName());
4036          event.setPackageName(getContext().getPackageName());
4037          event.setEnabled(isEnabled());
4038          event.setContentDescription(mContentDescription);
4039  
4040          if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) {
4041              ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList;
4042              getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD,
4043                      FOCUSABLES_ALL);
4044              event.setItemCount(focusablesTempList.size());
4045              event.setCurrentItemIndex(focusablesTempList.indexOf(this));
4046              focusablesTempList.clear();
4047          }
4048      }
4049  
4050      /**
4051       * Returns an {@link AccessibilityNodeInfo} representing this view from the
4052       * point of view of an {@link android.accessibilityservice.AccessibilityService}.
4053       * This method is responsible for obtaining an accessibility node info from a
4054       * pool of reusable instances and calling
4055       * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to
4056       * initialize the former.
4057       * <p>
4058       * Note: The client is responsible for recycling the obtained instance by calling
4059       *       {@link AccessibilityNodeInfo#recycle()} to minimize object creation.
4060       * </p>
4061       * @return A populated {@link AccessibilityNodeInfo}.
4062       *
4063       * @see AccessibilityNodeInfo
4064       */
createAccessibilityNodeInfo()4065      public AccessibilityNodeInfo createAccessibilityNodeInfo() {
4066          AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this);
4067          onInitializeAccessibilityNodeInfo(info);
4068          return info;
4069      }
4070  
4071      /**
4072       * Initializes an {@link AccessibilityNodeInfo} with information about this view.
4073       * The base implementation sets:
4074       * <ul>
4075       *   <li>{@link AccessibilityNodeInfo#setParent(View)},</li>
4076       *   <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li>
4077       *   <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li>
4078       *   <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li>
4079       *   <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li>
4080       *   <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li>
4081       *   <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li>
4082       *   <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li>
4083       *   <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li>
4084       *   <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li>
4085       *   <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li>
4086       *   <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li>
4087       * </ul>
4088       * <p>
4089       * Subclasses should override this method, call the super implementation,
4090       * and set additional attributes.
4091       * </p>
4092       * <p>
4093       * If an {@link AccessibilityDelegate} has been specified via calling
4094       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
4095       * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)}
4096       * is responsible for handling this call.
4097       * </p>
4098       *
4099       * @param info The instance to initialize.
4100       */
onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info)4101      public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
4102          if (mAccessibilityDelegate != null) {
4103              mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info);
4104          } else {
4105              onInitializeAccessibilityNodeInfoInternal(info);
4106          }
4107      }
4108  
4109      /**
4110       * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
4111       *
4112       * Note: Called from the default {@link AccessibilityDelegate}.
4113       */
onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info)4114      void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
4115          Rect bounds = mAttachInfo.mTmpInvalRect;
4116          getDrawingRect(bounds);
4117          info.setBoundsInParent(bounds);
4118  
4119          int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation;
4120          getLocationOnScreen(locationOnScreen);
4121          bounds.offsetTo(0, 0);
4122          bounds.offset(locationOnScreen[0], locationOnScreen[1]);
4123          info.setBoundsInScreen(bounds);
4124  
4125          ViewParent parent = getParent();
4126          if (parent instanceof View) {
4127              View parentView = (View) parent;
4128              info.setParent(parentView);
4129          }
4130  
4131          info.setPackageName(mContext.getPackageName());
4132          info.setClassName(getClass().getName());
4133          info.setContentDescription(getContentDescription());
4134  
4135          info.setEnabled(isEnabled());
4136          info.setClickable(isClickable());
4137          info.setFocusable(isFocusable());
4138          info.setFocused(isFocused());
4139          info.setSelected(isSelected());
4140          info.setLongClickable(isLongClickable());
4141  
4142          // TODO: These make sense only if we are in an AdapterView but all
4143          // views can be selected. Maybe from accessiiblity perspective
4144          // we should report as selectable view in an AdapterView.
4145          info.addAction(AccessibilityNodeInfo.ACTION_SELECT);
4146          info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION);
4147  
4148          if (isFocusable()) {
4149              if (isFocused()) {
4150                  info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS);
4151              } else {
4152                  info.addAction(AccessibilityNodeInfo.ACTION_FOCUS);
4153              }
4154          }
4155      }
4156  
4157      /**
4158       * Sets a delegate for implementing accessibility support via compositon as
4159       * opposed to inheritance. The delegate's primary use is for implementing
4160       * backwards compatible widgets. For more details see {@link AccessibilityDelegate}.
4161       *
4162       * @param delegate The delegate instance.
4163       *
4164       * @see AccessibilityDelegate
4165       */
setAccessibilityDelegate(AccessibilityDelegate delegate)4166      public void setAccessibilityDelegate(AccessibilityDelegate delegate) {
4167          mAccessibilityDelegate = delegate;
4168      }
4169  
4170      /**
4171       * Gets the unique identifier of this view on the screen for accessibility purposes.
4172       * If this {@link View} is not attached to any window, {@value #NO_ID} is returned.
4173       *
4174       * @return The view accessibility id.
4175       *
4176       * @hide
4177       */
getAccessibilityViewId()4178      public int getAccessibilityViewId() {
4179          if (mAccessibilityViewId == NO_ID) {
4180              mAccessibilityViewId = sNextAccessibilityViewId++;
4181          }
4182          return mAccessibilityViewId;
4183      }
4184  
4185      /**
4186       * Gets the unique identifier of the window in which this View reseides.
4187       *
4188       * @return The window accessibility id.
4189       *
4190       * @hide
4191       */
getAccessibilityWindowId()4192      public int getAccessibilityWindowId() {
4193          return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID;
4194      }
4195  
4196      /**
4197       * Gets the {@link View} description. It briefly describes the view and is
4198       * primarily used for accessibility support. Set this property to enable
4199       * better accessibility support for your application. This is especially
4200       * true for views that do not have textual representation (For example,
4201       * ImageButton).
4202       *
4203       * @return The content descriptiopn.
4204       *
4205       * @attr ref android.R.styleable#View_contentDescription
4206       */
getContentDescription()4207      public CharSequence getContentDescription() {
4208          return mContentDescription;
4209      }
4210  
4211      /**
4212       * Sets the {@link View} description. It briefly describes the view and is
4213       * primarily used for accessibility support. Set this property to enable
4214       * better accessibility support for your application. This is especially
4215       * true for views that do not have textual representation (For example,
4216       * ImageButton).
4217       *
4218       * @param contentDescription The content description.
4219       *
4220       * @attr ref android.R.styleable#View_contentDescription
4221       */
setContentDescription(CharSequence contentDescription)4222      public void setContentDescription(CharSequence contentDescription) {
4223          mContentDescription = contentDescription;
4224      }
4225  
4226      /**
4227       * Invoked whenever this view loses focus, either by losing window focus or by losing
4228       * focus within its window. This method can be used to clear any state tied to the
4229       * focus. For instance, if a button is held pressed with the trackball and the window
4230       * loses focus, this method can be used to cancel the press.
4231       *
4232       * Subclasses of View overriding this method should always call super.onFocusLost().
4233       *
4234       * @see #onFocusChanged(boolean, int, android.graphics.Rect)
4235       * @see #onWindowFocusChanged(boolean)
4236       *
4237       * @hide pending API council approval
4238       */
onFocusLost()4239      protected void onFocusLost() {
4240          resetPressedState();
4241      }
4242  
resetPressedState()4243      private void resetPressedState() {
4244          if ((mViewFlags & ENABLED_MASK) == DISABLED) {
4245              return;
4246          }
4247  
4248          if (isPressed()) {
4249              setPressed(false);
4250  
4251              if (!mHasPerformedLongPress) {
4252                  removeLongPressCallback();
4253              }
4254          }
4255      }
4256  
4257      /**
4258       * Returns true if this view has focus
4259       *
4260       * @return True if this view has focus, false otherwise.
4261       */
4262      @ViewDebug.ExportedProperty(category = "focus")
isFocused()4263      public boolean isFocused() {
4264          return (mPrivateFlags & FOCUSED) != 0;
4265      }
4266  
4267      /**
4268       * Find the view in the hierarchy rooted at this view that currently has
4269       * focus.
4270       *
4271       * @return The view that currently has focus, or null if no focused view can
4272       *         be found.
4273       */
findFocus()4274      public View findFocus() {
4275          return (mPrivateFlags & FOCUSED) != 0 ? this : null;
4276      }
4277  
4278      /**
4279       * Change whether this view is one of the set of scrollable containers in
4280       * its window.  This will be used to determine whether the window can
4281       * resize or must pan when a soft input area is open -- scrollable
4282       * containers allow the window to use resize mode since the container
4283       * will appropriately shrink.
4284       */
setScrollContainer(boolean isScrollContainer)4285      public void setScrollContainer(boolean isScrollContainer) {
4286          if (isScrollContainer) {
4287              if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) {
4288                  mAttachInfo.mScrollContainers.add(this);
4289                  mPrivateFlags |= SCROLL_CONTAINER_ADDED;
4290              }
4291              mPrivateFlags |= SCROLL_CONTAINER;
4292          } else {
4293              if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) {
4294                  mAttachInfo.mScrollContainers.remove(this);
4295              }
4296              mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED);
4297          }
4298      }
4299  
4300      /**
4301       * Returns the quality of the drawing cache.
4302       *
4303       * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO},
4304       *         {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH}
4305       *
4306       * @see #setDrawingCacheQuality(int)
4307       * @see #setDrawingCacheEnabled(boolean)
4308       * @see #isDrawingCacheEnabled()
4309       *
4310       * @attr ref android.R.styleable#View_drawingCacheQuality
4311       */
getDrawingCacheQuality()4312      public int getDrawingCacheQuality() {
4313          return mViewFlags & DRAWING_CACHE_QUALITY_MASK;
4314      }
4315  
4316      /**
4317       * Set the drawing cache quality of this view. This value is used only when the
4318       * drawing cache is enabled
4319       *
4320       * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO},
4321       *        {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH}
4322       *
4323       * @see #getDrawingCacheQuality()
4324       * @see #setDrawingCacheEnabled(boolean)
4325       * @see #isDrawingCacheEnabled()
4326       *
4327       * @attr ref android.R.styleable#View_drawingCacheQuality
4328       */
setDrawingCacheQuality(int quality)4329      public void setDrawingCacheQuality(int quality) {
4330          setFlags(quality, DRAWING_CACHE_QUALITY_MASK);
4331      }
4332  
4333      /**
4334       * Returns whether the screen should remain on, corresponding to the current
4335       * value of {@link #KEEP_SCREEN_ON}.
4336       *
4337       * @return Returns true if {@link #KEEP_SCREEN_ON} is set.
4338       *
4339       * @see #setKeepScreenOn(boolean)
4340       *
4341       * @attr ref android.R.styleable#View_keepScreenOn
4342       */
getKeepScreenOn()4343      public boolean getKeepScreenOn() {
4344          return (mViewFlags & KEEP_SCREEN_ON) != 0;
4345      }
4346  
4347      /**
4348       * Controls whether the screen should remain on, modifying the
4349       * value of {@link #KEEP_SCREEN_ON}.
4350       *
4351       * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}.
4352       *
4353       * @see #getKeepScreenOn()
4354       *
4355       * @attr ref android.R.styleable#View_keepScreenOn
4356       */
setKeepScreenOn(boolean keepScreenOn)4357      public void setKeepScreenOn(boolean keepScreenOn) {
4358          setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON);
4359      }
4360  
4361      /**
4362       * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}.
4363       * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
4364       *
4365       * @attr ref android.R.styleable#View_nextFocusLeft
4366       */
getNextFocusLeftId()4367      public int getNextFocusLeftId() {
4368          return mNextFocusLeftId;
4369      }
4370  
4371      /**
4372       * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}.
4373       * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should
4374       * decide automatically.
4375       *
4376       * @attr ref android.R.styleable#View_nextFocusLeft
4377       */
setNextFocusLeftId(int nextFocusLeftId)4378      public void setNextFocusLeftId(int nextFocusLeftId) {
4379          mNextFocusLeftId = nextFocusLeftId;
4380      }
4381  
4382      /**
4383       * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}.
4384       * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
4385       *
4386       * @attr ref android.R.styleable#View_nextFocusRight
4387       */
getNextFocusRightId()4388      public int getNextFocusRightId() {
4389          return mNextFocusRightId;
4390      }
4391  
4392      /**
4393       * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}.
4394       * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should
4395       * decide automatically.
4396       *
4397       * @attr ref android.R.styleable#View_nextFocusRight
4398       */
setNextFocusRightId(int nextFocusRightId)4399      public void setNextFocusRightId(int nextFocusRightId) {
4400          mNextFocusRightId = nextFocusRightId;
4401      }
4402  
4403      /**
4404       * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}.
4405       * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
4406       *
4407       * @attr ref android.R.styleable#View_nextFocusUp
4408       */
getNextFocusUpId()4409      public int getNextFocusUpId() {
4410          return mNextFocusUpId;
4411      }
4412  
4413      /**
4414       * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}.
4415       * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should
4416       * decide automatically.
4417       *
4418       * @attr ref android.R.styleable#View_nextFocusUp
4419       */
setNextFocusUpId(int nextFocusUpId)4420      public void setNextFocusUpId(int nextFocusUpId) {
4421          mNextFocusUpId = nextFocusUpId;
4422      }
4423  
4424      /**
4425       * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}.
4426       * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
4427       *
4428       * @attr ref android.R.styleable#View_nextFocusDown
4429       */
getNextFocusDownId()4430      public int getNextFocusDownId() {
4431          return mNextFocusDownId;
4432      }
4433  
4434      /**
4435       * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}.
4436       * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should
4437       * decide automatically.
4438       *
4439       * @attr ref android.R.styleable#View_nextFocusDown
4440       */
setNextFocusDownId(int nextFocusDownId)4441      public void setNextFocusDownId(int nextFocusDownId) {
4442          mNextFocusDownId = nextFocusDownId;
4443      }
4444  
4445      /**
4446       * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}.
4447       * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
4448       *
4449       * @attr ref android.R.styleable#View_nextFocusForward
4450       */
getNextFocusForwardId()4451      public int getNextFocusForwardId() {
4452          return mNextFocusForwardId;
4453      }
4454  
4455      /**
4456       * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}.
4457       * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should
4458       * decide automatically.
4459       *
4460       * @attr ref android.R.styleable#View_nextFocusForward
4461       */
setNextFocusForwardId(int nextFocusForwardId)4462      public void setNextFocusForwardId(int nextFocusForwardId) {
4463          mNextFocusForwardId = nextFocusForwardId;
4464      }
4465  
4466      /**
4467       * Returns the visibility of this view and all of its ancestors
4468       *
4469       * @return True if this view and all of its ancestors are {@link #VISIBLE}
4470       */
isShown()4471      public boolean isShown() {
4472          View current = this;
4473          //noinspection ConstantConditions
4474          do {
4475              if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) {
4476                  return false;
4477              }
4478              ViewParent parent = current.mParent;
4479              if (parent == null) {
4480                  return false; // We are not attached to the view root
4481              }
4482              if (!(parent instanceof View)) {
4483                  return true;
4484              }
4485              current = (View) parent;
4486          } while (current != null);
4487  
4488          return false;
4489      }
4490  
4491      /**
4492       * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag
4493       * is set
4494       *
4495       * @param insets Insets for system windows
4496       *
4497       * @return True if this view applied the insets, false otherwise
4498       */
fitSystemWindows(Rect insets)4499      protected boolean fitSystemWindows(Rect insets) {
4500          if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) {
4501              mPaddingLeft = insets.left;
4502              mPaddingTop = insets.top;
4503              mPaddingRight = insets.right;
4504              mPaddingBottom = insets.bottom;
4505              requestLayout();
4506              return true;
4507          }
4508          return false;
4509      }
4510  
4511      /**
4512       * Set whether or not this view should account for system screen decorations
4513       * such as the status bar and inset its content. This allows this view to be
4514       * positioned in absolute screen coordinates and remain visible to the user.
4515       *
4516       * <p>This should only be used by top-level window decor views.
4517       *
4518       * @param fitSystemWindows true to inset content for system screen decorations, false for
4519       *                         default behavior.
4520       *
4521       * @attr ref android.R.styleable#View_fitsSystemWindows
4522       */
setFitsSystemWindows(boolean fitSystemWindows)4523      public void setFitsSystemWindows(boolean fitSystemWindows) {
4524          setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS);
4525      }
4526  
4527      /**
4528       * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view
4529       * will account for system screen decorations such as the status bar and inset its
4530       * content. This allows the view to be positioned in absolute screen coordinates
4531       * and remain visible to the user.
4532       *
4533       * @return true if this view will adjust its content bounds for system screen decorations.
4534       *
4535       * @attr ref android.R.styleable#View_fitsSystemWindows
4536       */
fitsSystemWindows()4537      public boolean fitsSystemWindows() {
4538          return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS;
4539      }
4540  
4541      /**
4542       * Returns the visibility status for this view.
4543       *
4544       * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
4545       * @attr ref android.R.styleable#View_visibility
4546       */
4547      @ViewDebug.ExportedProperty(mapping = {
4548          @ViewDebug.IntToString(from = VISIBLE,   to = "VISIBLE"),
4549          @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"),
4550          @ViewDebug.IntToString(from = GONE,      to = "GONE")
4551      })
getVisibility()4552      public int getVisibility() {
4553          return mViewFlags & VISIBILITY_MASK;
4554      }
4555  
4556      /**
4557       * Set the enabled state of this view.
4558       *
4559       * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
4560       * @attr ref android.R.styleable#View_visibility
4561       */
4562      @RemotableViewMethod
setVisibility(int visibility)4563      public void setVisibility(int visibility) {
4564          setFlags(visibility, VISIBILITY_MASK);
4565          if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false);
4566      }
4567  
4568      /**
4569       * Returns the enabled status for this view. The interpretation of the
4570       * enabled state varies by subclass.
4571       *
4572       * @return True if this view is enabled, false otherwise.
4573       */
4574      @ViewDebug.ExportedProperty
isEnabled()4575      public boolean isEnabled() {
4576          return (mViewFlags & ENABLED_MASK) == ENABLED;
4577      }
4578  
4579      /**
4580       * Set the enabled state of this view. The interpretation of the enabled
4581       * state varies by subclass.
4582       *
4583       * @param enabled True if this view is enabled, false otherwise.
4584       */
4585      @RemotableViewMethod
setEnabled(boolean enabled)4586      public void setEnabled(boolean enabled) {
4587          if (enabled == isEnabled()) return;
4588  
4589          setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK);
4590  
4591          /*
4592           * The View most likely has to change its appearance, so refresh
4593           * the drawable state.
4594           */
4595          refreshDrawableState();
4596  
4597          // Invalidate too, since the default behavior for views is to be
4598          // be drawn at 50% alpha rather than to change the drawable.
4599          invalidate(true);
4600      }
4601  
4602      /**
4603       * Set whether this view can receive the focus.
4604       *
4605       * Setting this to false will also ensure that this view is not focusable
4606       * in touch mode.
4607       *
4608       * @param focusable If true, this view can receive the focus.
4609       *
4610       * @see #setFocusableInTouchMode(boolean)
4611       * @attr ref android.R.styleable#View_focusable
4612       */
setFocusable(boolean focusable)4613      public void setFocusable(boolean focusable) {
4614          if (!focusable) {
4615              setFlags(0, FOCUSABLE_IN_TOUCH_MODE);
4616          }
4617          setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK);
4618      }
4619  
4620      /**
4621       * Set whether this view can receive focus while in touch mode.
4622       *
4623       * Setting this to true will also ensure that this view is focusable.
4624       *
4625       * @param focusableInTouchMode If true, this view can receive the focus while
4626       *   in touch mode.
4627       *
4628       * @see #setFocusable(boolean)
4629       * @attr ref android.R.styleable#View_focusableInTouchMode
4630       */
setFocusableInTouchMode(boolean focusableInTouchMode)4631      public void setFocusableInTouchMode(boolean focusableInTouchMode) {
4632          // Focusable in touch mode should always be set before the focusable flag
4633          // otherwise, setting the focusable flag will trigger a focusableViewAvailable()
4634          // which, in touch mode, will not successfully request focus on this view
4635          // because the focusable in touch mode flag is not set
4636          setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE);
4637          if (focusableInTouchMode) {
4638              setFlags(FOCUSABLE, FOCUSABLE_MASK);
4639          }
4640      }
4641  
4642      /**
4643       * Set whether this view should have sound effects enabled for events such as
4644       * clicking and touching.
4645       *
4646       * <p>You may wish to disable sound effects for a view if you already play sounds,
4647       * for instance, a dial key that plays dtmf tones.
4648       *
4649       * @param soundEffectsEnabled whether sound effects are enabled for this view.
4650       * @see #isSoundEffectsEnabled()
4651       * @see #playSoundEffect(int)
4652       * @attr ref android.R.styleable#View_soundEffectsEnabled
4653       */
setSoundEffectsEnabled(boolean soundEffectsEnabled)4654      public void setSoundEffectsEnabled(boolean soundEffectsEnabled) {
4655          setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED);
4656      }
4657  
4658      /**
4659       * @return whether this view should have sound effects enabled for events such as
4660       *     clicking and touching.
4661       *
4662       * @see #setSoundEffectsEnabled(boolean)
4663       * @see #playSoundEffect(int)
4664       * @attr ref android.R.styleable#View_soundEffectsEnabled
4665       */
4666      @ViewDebug.ExportedProperty
isSoundEffectsEnabled()4667      public boolean isSoundEffectsEnabled() {
4668          return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED);
4669      }
4670  
4671      /**
4672       * Set whether this view should have haptic feedback for events such as
4673       * long presses.
4674       *
4675       * <p>You may wish to disable haptic feedback if your view already controls
4676       * its own haptic feedback.
4677       *
4678       * @param hapticFeedbackEnabled whether haptic feedback enabled for this view.
4679       * @see #isHapticFeedbackEnabled()
4680       * @see #performHapticFeedback(int)
4681       * @attr ref android.R.styleable#View_hapticFeedbackEnabled
4682       */
setHapticFeedbackEnabled(boolean hapticFeedbackEnabled)4683      public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) {
4684          setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED);
4685      }
4686  
4687      /**
4688       * @return whether this view should have haptic feedback enabled for events
4689       * long presses.
4690       *
4691       * @see #setHapticFeedbackEnabled(boolean)
4692       * @see #performHapticFeedback(int)
4693       * @attr ref android.R.styleable#View_hapticFeedbackEnabled
4694       */
4695      @ViewDebug.ExportedProperty
isHapticFeedbackEnabled()4696      public boolean isHapticFeedbackEnabled() {
4697          return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED);
4698      }
4699  
4700      /**
4701       * Returns the layout direction for this view.
4702       *
4703       * @return One of {@link #LAYOUT_DIRECTION_LTR},
4704       *   {@link #LAYOUT_DIRECTION_RTL},
4705       *   {@link #LAYOUT_DIRECTION_INHERIT} or
4706       *   {@link #LAYOUT_DIRECTION_LOCALE}.
4707       * @attr ref android.R.styleable#View_layoutDirection
4708       *
4709       * @hide
4710       */
4711      @ViewDebug.ExportedProperty(category = "layout", mapping = {
4712          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR,     to = "LTR"),
4713          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL,     to = "RTL"),
4714          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"),
4715          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE,  to = "LOCALE")
4716      })
getLayoutDirection()4717      public int getLayoutDirection() {
4718          return mViewFlags & LAYOUT_DIRECTION_MASK;
4719      }
4720  
4721      /**
4722       * Set the layout direction for this view. This will propagate a reset of layout direction
4723       * resolution to the view's children and resolve layout direction for this view.
4724       *
4725       * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR},
4726       *   {@link #LAYOUT_DIRECTION_RTL},
4727       *   {@link #LAYOUT_DIRECTION_INHERIT} or
4728       *   {@link #LAYOUT_DIRECTION_LOCALE}.
4729       *
4730       * @attr ref android.R.styleable#View_layoutDirection
4731       *
4732       * @hide
4733       */
4734      @RemotableViewMethod
setLayoutDirection(int layoutDirection)4735      public void setLayoutDirection(int layoutDirection) {
4736          if (getLayoutDirection() != layoutDirection) {
4737              resetResolvedLayoutDirection();
4738              // Setting the flag will also request a layout.
4739              setFlags(layoutDirection, LAYOUT_DIRECTION_MASK);
4740          }
4741      }
4742  
4743      /**
4744       * Returns the resolved layout direction for this view.
4745       *
4746       * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns
4747       * {@link #LAYOUT_DIRECTION_LTR} id the layout direction is not RTL.
4748       *
4749       * @hide
4750       */
4751      @ViewDebug.ExportedProperty(category = "layout", mapping = {
4752          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR,     to = "RESOLVED_DIRECTION_LTR"),
4753          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL,     to = "RESOLVED_DIRECTION_RTL")
4754      })
getResolvedLayoutDirection()4755      public int getResolvedLayoutDirection() {
4756          resolveLayoutDirectionIfNeeded();
4757          return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ?
4758                  LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR;
4759      }
4760  
4761      /**
4762       * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from
4763       * layout attribute and/or the inherited value from the parent.</p>
4764       *
4765       * @return true if the layout is right-to-left.
4766       *
4767       * @hide
4768       */
4769      @ViewDebug.ExportedProperty(category = "layout")
isLayoutRtl()4770      public boolean isLayoutRtl() {
4771          return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL);
4772      }
4773  
4774      /**
4775       * If this view doesn't do any drawing on its own, set this flag to
4776       * allow further optimizations. By default, this flag is not set on
4777       * View, but could be set on some View subclasses such as ViewGroup.
4778       *
4779       * Typically, if you override {@link #onDraw(android.graphics.Canvas)}
4780       * you should clear this flag.
4781       *
4782       * @param willNotDraw whether or not this View draw on its own
4783       */
setWillNotDraw(boolean willNotDraw)4784      public void setWillNotDraw(boolean willNotDraw) {
4785          setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK);
4786      }
4787  
4788      /**
4789       * Returns whether or not this View draws on its own.
4790       *
4791       * @return true if this view has nothing to draw, false otherwise
4792       */
4793      @ViewDebug.ExportedProperty(category = "drawing")
willNotDraw()4794      public boolean willNotDraw() {
4795          return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW;
4796      }
4797  
4798      /**
4799       * When a View's drawing cache is enabled, drawing is redirected to an
4800       * offscreen bitmap. Some views, like an ImageView, must be able to
4801       * bypass this mechanism if they already draw a single bitmap, to avoid
4802       * unnecessary usage of the memory.
4803       *
4804       * @param willNotCacheDrawing true if this view does not cache its
4805       *        drawing, false otherwise
4806       */
setWillNotCacheDrawing(boolean willNotCacheDrawing)4807      public void setWillNotCacheDrawing(boolean willNotCacheDrawing) {
4808          setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING);
4809      }
4810  
4811      /**
4812       * Returns whether or not this View can cache its drawing or not.
4813       *
4814       * @return true if this view does not cache its drawing, false otherwise
4815       */
4816      @ViewDebug.ExportedProperty(category = "drawing")
willNotCacheDrawing()4817      public boolean willNotCacheDrawing() {
4818          return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING;
4819      }
4820  
4821      /**
4822       * Indicates whether this view reacts to click events or not.
4823       *
4824       * @return true if the view is clickable, false otherwise
4825       *
4826       * @see #setClickable(boolean)
4827       * @attr ref android.R.styleable#View_clickable
4828       */
4829      @ViewDebug.ExportedProperty
isClickable()4830      public boolean isClickable() {
4831          return (mViewFlags & CLICKABLE) == CLICKABLE;
4832      }
4833  
4834      /**
4835       * Enables or disables click events for this view. When a view
4836       * is clickable it will change its state to "pressed" on every click.
4837       * Subclasses should set the view clickable to visually react to
4838       * user's clicks.
4839       *
4840       * @param clickable true to make the view clickable, false otherwise
4841       *
4842       * @see #isClickable()
4843       * @attr ref android.R.styleable#View_clickable
4844       */
setClickable(boolean clickable)4845      public void setClickable(boolean clickable) {
4846          setFlags(clickable ? CLICKABLE : 0, CLICKABLE);
4847      }
4848  
4849      /**
4850       * Indicates whether this view reacts to long click events or not.
4851       *
4852       * @return true if the view is long clickable, false otherwise
4853       *
4854       * @see #setLongClickable(boolean)
4855       * @attr ref android.R.styleable#View_longClickable
4856       */
isLongClickable()4857      public boolean isLongClickable() {
4858          return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE;
4859      }
4860  
4861      /**
4862       * Enables or disables long click events for this view. When a view is long
4863       * clickable it reacts to the user holding down the button for a longer
4864       * duration than a tap. This event can either launch the listener or a
4865       * context menu.
4866       *
4867       * @param longClickable true to make the view long clickable, false otherwise
4868       * @see #isLongClickable()
4869       * @attr ref android.R.styleable#View_longClickable
4870       */
setLongClickable(boolean longClickable)4871      public void setLongClickable(boolean longClickable) {
4872          setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE);
4873      }
4874  
4875      /**
4876       * Sets the pressed state for this view.
4877       *
4878       * @see #isClickable()
4879       * @see #setClickable(boolean)
4880       *
4881       * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts
4882       *        the View's internal state from a previously set "pressed" state.
4883       */
setPressed(boolean pressed)4884      public void setPressed(boolean pressed) {
4885          if (pressed) {
4886              mPrivateFlags |= PRESSED;
4887          } else {
4888              mPrivateFlags &= ~PRESSED;
4889          }
4890          refreshDrawableState();
4891          dispatchSetPressed(pressed);
4892      }
4893  
4894      /**
4895       * Dispatch setPressed to all of this View's children.
4896       *
4897       * @see #setPressed(boolean)
4898       *
4899       * @param pressed The new pressed state
4900       */
dispatchSetPressed(boolean pressed)4901      protected void dispatchSetPressed(boolean pressed) {
4902      }
4903  
4904      /**
4905       * Indicates whether the view is currently in pressed state. Unless
4906       * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter
4907       * the pressed state.
4908       *
4909       * @see #setPressed(boolean)
4910       * @see #isClickable()
4911       * @see #setClickable(boolean)
4912       *
4913       * @return true if the view is currently pressed, false otherwise
4914       */
isPressed()4915      public boolean isPressed() {
4916          return (mPrivateFlags & PRESSED) == PRESSED;
4917      }
4918  
4919      /**
4920       * Indicates whether this view will save its state (that is,
4921       * whether its {@link #onSaveInstanceState} method will be called).
4922       *
4923       * @return Returns true if the view state saving is enabled, else false.
4924       *
4925       * @see #setSaveEnabled(boolean)
4926       * @attr ref android.R.styleable#View_saveEnabled
4927       */
isSaveEnabled()4928      public boolean isSaveEnabled() {
4929          return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED;
4930      }
4931  
4932      /**
4933       * Controls whether the saving of this view's state is
4934       * enabled (that is, whether its {@link #onSaveInstanceState} method
4935       * will be called).  Note that even if freezing is enabled, the
4936       * view still must have an id assigned to it (via {@link #setId(int)})
4937       * for its state to be saved.  This flag can only disable the
4938       * saving of this view; any child views may still have their state saved.
4939       *
4940       * @param enabled Set to false to <em>disable</em> state saving, or true
4941       * (the default) to allow it.
4942       *
4943       * @see #isSaveEnabled()
4944       * @see #setId(int)
4945       * @see #onSaveInstanceState()
4946       * @attr ref android.R.styleable#View_saveEnabled
4947       */
setSaveEnabled(boolean enabled)4948      public void setSaveEnabled(boolean enabled) {
4949          setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK);
4950      }
4951  
4952      /**
4953       * Gets whether the framework should discard touches when the view's
4954       * window is obscured by another visible window.
4955       * Refer to the {@link View} security documentation for more details.
4956       *
4957       * @return True if touch filtering is enabled.
4958       *
4959       * @see #setFilterTouchesWhenObscured(boolean)
4960       * @attr ref android.R.styleable#View_filterTouchesWhenObscured
4961       */
4962      @ViewDebug.ExportedProperty
getFilterTouchesWhenObscured()4963      public boolean getFilterTouchesWhenObscured() {
4964          return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0;
4965      }
4966  
4967      /**
4968       * Sets whether the framework should discard touches when the view's
4969       * window is obscured by another visible window.
4970       * Refer to the {@link View} security documentation for more details.
4971       *
4972       * @param enabled True if touch filtering should be enabled.
4973       *
4974       * @see #getFilterTouchesWhenObscured
4975       * @attr ref android.R.styleable#View_filterTouchesWhenObscured
4976       */
setFilterTouchesWhenObscured(boolean enabled)4977      public void setFilterTouchesWhenObscured(boolean enabled) {
4978          setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED,
4979                  FILTER_TOUCHES_WHEN_OBSCURED);
4980      }
4981  
4982      /**
4983       * Indicates whether the entire hierarchy under this view will save its
4984       * state when a state saving traversal occurs from its parent.  The default
4985       * is true; if false, these views will not be saved unless
4986       * {@link #saveHierarchyState(SparseArray)} is called directly on this view.
4987       *
4988       * @return Returns true if the view state saving from parent is enabled, else false.
4989       *
4990       * @see #setSaveFromParentEnabled(boolean)
4991       */
isSaveFromParentEnabled()4992      public boolean isSaveFromParentEnabled() {
4993          return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED;
4994      }
4995  
4996      /**
4997       * Controls whether the entire hierarchy under this view will save its
4998       * state when a state saving traversal occurs from its parent.  The default
4999       * is true; if false, these views will not be saved unless
5000       * {@link #saveHierarchyState(SparseArray)} is called directly on this view.
5001       *
5002       * @param enabled Set to false to <em>disable</em> state saving, or true
5003       * (the default) to allow it.
5004       *
5005       * @see #isSaveFromParentEnabled()
5006       * @see #setId(int)
5007       * @see #onSaveInstanceState()
5008       */
setSaveFromParentEnabled(boolean enabled)5009      public void setSaveFromParentEnabled(boolean enabled) {
5010          setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK);
5011      }
5012  
5013  
5014      /**
5015       * Returns whether this View is able to take focus.
5016       *
5017       * @return True if this view can take focus, or false otherwise.
5018       * @attr ref android.R.styleable#View_focusable
5019       */
5020      @ViewDebug.ExportedProperty(category = "focus")
isFocusable()5021      public final boolean isFocusable() {
5022          return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK);
5023      }
5024  
5025      /**
5026       * When a view is focusable, it may not want to take focus when in touch mode.
5027       * For example, a button would like focus when the user is navigating via a D-pad
5028       * so that the user can click on it, but once the user starts touching the screen,
5029       * the button shouldn't take focus
5030       * @return Whether the view is focusable in touch mode.
5031       * @attr ref android.R.styleable#View_focusableInTouchMode
5032       */
5033      @ViewDebug.ExportedProperty
isFocusableInTouchMode()5034      public final boolean isFocusableInTouchMode() {
5035          return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE);
5036      }
5037  
5038      /**
5039       * Find the nearest view in the specified direction that can take focus.
5040       * This does not actually give focus to that view.
5041       *
5042       * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
5043       *
5044       * @return The nearest focusable in the specified direction, or null if none
5045       *         can be found.
5046       */
focusSearch(int direction)5047      public View focusSearch(int direction) {
5048          if (mParent != null) {
5049              return mParent.focusSearch(this, direction);
5050          } else {
5051              return null;
5052          }
5053      }
5054  
5055      /**
5056       * This method is the last chance for the focused view and its ancestors to
5057       * respond to an arrow key. This is called when the focused view did not
5058       * consume the key internally, nor could the view system find a new view in
5059       * the requested direction to give focus to.
5060       *
5061       * @param focused The currently focused view.
5062       * @param direction The direction focus wants to move. One of FOCUS_UP,
5063       *        FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT.
5064       * @return True if the this view consumed this unhandled move.
5065       */
dispatchUnhandledMove(View focused, int direction)5066      public boolean dispatchUnhandledMove(View focused, int direction) {
5067          return false;
5068      }
5069  
5070      /**
5071       * If a user manually specified the next view id for a particular direction,
5072       * use the root to look up the view.
5073       * @param root The root view of the hierarchy containing this view.
5074       * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD,
5075       * or FOCUS_BACKWARD.
5076       * @return The user specified next view, or null if there is none.
5077       */
findUserSetNextFocus(View root, int direction)5078      View findUserSetNextFocus(View root, int direction) {
5079          switch (direction) {
5080              case FOCUS_LEFT:
5081                  if (mNextFocusLeftId == View.NO_ID) return null;
5082                  return findViewInsideOutShouldExist(root, mNextFocusLeftId);
5083              case FOCUS_RIGHT:
5084                  if (mNextFocusRightId == View.NO_ID) return null;
5085                  return findViewInsideOutShouldExist(root, mNextFocusRightId);
5086              case FOCUS_UP:
5087                  if (mNextFocusUpId == View.NO_ID) return null;
5088                  return findViewInsideOutShouldExist(root, mNextFocusUpId);
5089              case FOCUS_DOWN:
5090                  if (mNextFocusDownId == View.NO_ID) return null;
5091                  return findViewInsideOutShouldExist(root, mNextFocusDownId);
5092              case FOCUS_FORWARD:
5093                  if (mNextFocusForwardId == View.NO_ID) return null;
5094                  return findViewInsideOutShouldExist(root, mNextFocusForwardId);
5095              case FOCUS_BACKWARD: {
5096                  final int id = mID;
5097                  return root.findViewByPredicateInsideOut(this, new Predicate<View>() {
5098                      @Override
5099                      public boolean apply(View t) {
5100                          return t.mNextFocusForwardId == id;
5101                      }
5102                  });
5103              }
5104          }
5105          return null;
5106      }
5107  
5108      private View findViewInsideOutShouldExist(View root, final int childViewId) {
5109          View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() {
5110              @Override
5111              public boolean apply(View t) {
5112                  return t.mID == childViewId;
5113              }
5114          });
5115  
5116          if (result == null) {
5117              Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified "
5118                      + "by user for id " + childViewId);
5119          }
5120          return result;
5121      }
5122  
5123      /**
5124       * Find and return all focusable views that are descendants of this view,
5125       * possibly including this view if it is focusable itself.
5126       *
5127       * @param direction The direction of the focus
5128       * @return A list of focusable views
5129       */
5130      public ArrayList<View> getFocusables(int direction) {
5131          ArrayList<View> result = new ArrayList<View>(24);
5132          addFocusables(result, direction);
5133          return result;
5134      }
5135  
5136      /**
5137       * Add any focusable views that are descendants of this view (possibly
5138       * including this view if it is focusable itself) to views.  If we are in touch mode,
5139       * only add views that are also focusable in touch mode.
5140       *
5141       * @param views Focusable views found so far
5142       * @param direction The direction of the focus
5143       */
5144      public void addFocusables(ArrayList<View> views, int direction) {
5145          addFocusables(views, direction, FOCUSABLES_TOUCH_MODE);
5146      }
5147  
5148      /**
5149       * Adds any focusable views that are descendants of this view (possibly
5150       * including this view if it is focusable itself) to views. This method
5151       * adds all focusable views regardless if we are in touch mode or
5152       * only views focusable in touch mode if we are in touch mode depending on
5153       * the focusable mode paramater.
5154       *
5155       * @param views Focusable views found so far or null if all we are interested is
5156       *        the number of focusables.
5157       * @param direction The direction of the focus.
5158       * @param focusableMode The type of focusables to be added.
5159       *
5160       * @see #FOCUSABLES_ALL
5161       * @see #FOCUSABLES_TOUCH_MODE
5162       */
5163      public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
5164          if (!isFocusable()) {
5165              return;
5166          }
5167  
5168          if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE &&
5169                  isInTouchMode() && !isFocusableInTouchMode()) {
5170              return;
5171          }
5172  
5173          if (views != null) {
5174              views.add(this);
5175          }
5176      }
5177  
5178      /**
5179       * Finds the Views that contain given text. The containment is case insensitive.
5180       * The search is performed by either the text that the View renders or the content
5181       * description that describes the view for accessibility purposes and the view does
5182       * not render or both. Clients can specify how the search is to be performed via
5183       * passing the {@link #FIND_VIEWS_WITH_TEXT} and
5184       * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags.
5185       *
5186       * @param outViews The output list of matching Views.
5187       * @param searched The text to match against.
5188       *
5189       * @see #FIND_VIEWS_WITH_TEXT
5190       * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION
5191       * @see #setContentDescription(CharSequence)
5192       */
5193      public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) {
5194          if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 && !TextUtils.isEmpty(searched)
5195                  && !TextUtils.isEmpty(mContentDescription)) {
5196              String searchedLowerCase = searched.toString().toLowerCase();
5197              String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase();
5198              if (contentDescriptionLowerCase.contains(searchedLowerCase)) {
5199                  outViews.add(this);
5200              }
5201          }
5202      }
5203  
5204      /**
5205       * Find and return all touchable views that are descendants of this view,
5206       * possibly including this view if it is touchable itself.
5207       *
5208       * @return A list of touchable views
5209       */
5210      public ArrayList<View> getTouchables() {
5211          ArrayList<View> result = new ArrayList<View>();
5212          addTouchables(result);
5213          return result;
5214      }
5215  
5216      /**
5217       * Add any touchable views that are descendants of this view (possibly
5218       * including this view if it is touchable itself) to views.
5219       *
5220       * @param views Touchable views found so far
5221       */
5222      public void addTouchables(ArrayList<View> views) {
5223          final int viewFlags = mViewFlags;
5224  
5225          if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)
5226                  && (viewFlags & ENABLED_MASK) == ENABLED) {
5227              views.add(this);
5228          }
5229      }
5230  
5231      /**
5232       * Call this to try to give focus to a specific view or to one of its
5233       * descendants.
5234       *
5235       * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
5236       * false), or if it is focusable and it is not focusable in touch mode
5237       * ({@link #isFocusableInTouchMode}) while the device is in touch mode.
5238       *
5239       * See also {@link #focusSearch(int)}, which is what you call to say that you
5240       * have focus, and you want your parent to look for the next one.
5241       *
5242       * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments
5243       * {@link #FOCUS_DOWN} and <code>null</code>.
5244       *
5245       * @return Whether this view or one of its descendants actually took focus.
5246       */
5247      public final boolean requestFocus() {
5248          return requestFocus(View.FOCUS_DOWN);
5249      }
5250  
5251  
5252      /**
5253       * Call this to try to give focus to a specific view or to one of its
5254       * descendants and give it a hint about what direction focus is heading.
5255       *
5256       * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
5257       * false), or if it is focusable and it is not focusable in touch mode
5258       * ({@link #isFocusableInTouchMode}) while the device is in touch mode.
5259       *
5260       * See also {@link #focusSearch(int)}, which is what you call to say that you
5261       * have focus, and you want your parent to look for the next one.
5262       *
5263       * This is equivalent to calling {@link #requestFocus(int, Rect)} with
5264       * <code>null</code> set for the previously focused rectangle.
5265       *
5266       * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
5267       * @return Whether this view or one of its descendants actually took focus.
5268       */
5269      public final boolean requestFocus(int direction) {
5270          return requestFocus(direction, null);
5271      }
5272  
5273      /**
5274       * Call this to try to give focus to a specific view or to one of its descendants
5275       * and give it hints about the direction and a specific rectangle that the focus
5276       * is coming from.  The rectangle can help give larger views a finer grained hint
5277       * about where focus is coming from, and therefore, where to show selection, or
5278       * forward focus change internally.
5279       *
5280       * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
5281       * false), or if it is focusable and it is not focusable in touch mode
5282       * ({@link #isFocusableInTouchMode}) while the device is in touch mode.
5283       *
5284       * A View will not take focus if it is not visible.
5285       *
5286       * A View will not take focus if one of its parents has
5287       * {@link android.view.ViewGroup#getDescendantFocusability()} equal to
5288       * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}.
5289       *
5290       * See also {@link #focusSearch(int)}, which is what you call to say that you
5291       * have focus, and you want your parent to look for the next one.
5292       *
5293       * You may wish to override this method if your custom {@link View} has an internal
5294       * {@link View} that it wishes to forward the request to.
5295       *
5296       * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
5297       * @param previouslyFocusedRect The rectangle (in this View's coordinate system)
5298       *        to give a finer grained hint about where focus is coming from.  May be null
5299       *        if there is no hint.
5300       * @return Whether this view or one of its descendants actually took focus.
5301       */
5302      public boolean requestFocus(int direction, Rect previouslyFocusedRect) {
5303          // need to be focusable
5304          if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE ||
5305                  (mViewFlags & VISIBILITY_MASK) != VISIBLE) {
5306              return false;
5307          }
5308  
5309          // need to be focusable in touch mode if in touch mode
5310          if (isInTouchMode() &&
5311              (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) {
5312                 return false;
5313          }
5314  
5315          // need to not have any parents blocking us
5316          if (hasAncestorThatBlocksDescendantFocus()) {
5317              return false;
5318          }
5319  
5320          handleFocusGainInternal(direction, previouslyFocusedRect);
5321          return true;
5322      }
5323  
5324      /** Gets the ViewAncestor, or null if not attached. */
5325      /*package*/ ViewRootImpl getViewRootImpl() {
5326          View root = getRootView();
5327          return root != null ? (ViewRootImpl)root.getParent() : null;
5328      }
5329  
5330      /**
5331       * Call this to try to give focus to a specific view or to one of its descendants. This is a
5332       * special variant of {@link #requestFocus() } that will allow views that are not focuable in
5333       * touch mode to request focus when they are touched.
5334       *
5335       * @return Whether this view or one of its descendants actually took focus.
5336       *
5337       * @see #isInTouchMode()
5338       *
5339       */
5340      public final boolean requestFocusFromTouch() {
5341          // Leave touch mode if we need to
5342          if (isInTouchMode()) {
5343              ViewRootImpl viewRoot = getViewRootImpl();
5344              if (viewRoot != null) {
5345                  viewRoot.ensureTouchMode(false);
5346              }
5347          }
5348          return requestFocus(View.FOCUS_DOWN);
5349      }
5350  
5351      /**
5352       * @return Whether any ancestor of this view blocks descendant focus.
5353       */
5354      private boolean hasAncestorThatBlocksDescendantFocus() {
5355          ViewParent ancestor = mParent;
5356          while (ancestor instanceof ViewGroup) {
5357              final ViewGroup vgAncestor = (ViewGroup) ancestor;
5358              if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) {
5359                  return true;
5360              } else {
5361                  ancestor = vgAncestor.getParent();
5362              }
5363          }
5364          return false;
5365      }
5366  
5367      /**
5368       * @hide
5369       */
5370      public void dispatchStartTemporaryDetach() {
5371          onStartTemporaryDetach();
5372      }
5373  
5374      /**
5375       * This is called when a container is going to temporarily detach a child, with
5376       * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}.
5377       * It will either be followed by {@link #onFinishTemporaryDetach()} or
5378       * {@link #onDetachedFromWindow()} when the container is done.
5379       */
5380      public void onStartTemporaryDetach() {
5381          removeUnsetPressCallback();
5382          mPrivateFlags |= CANCEL_NEXT_UP_EVENT;
5383      }
5384  
5385      /**
5386       * @hide
5387       */
5388      public void dispatchFinishTemporaryDetach() {
5389          onFinishTemporaryDetach();
5390      }
5391  
5392      /**
5393       * Called after {@link #onStartTemporaryDetach} when the container is done
5394       * changing the view.
5395       */
5396      public void onFinishTemporaryDetach() {
5397      }
5398  
5399      /**
5400       * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState}
5401       * for this view's window.  Returns null if the view is not currently attached
5402       * to the window.  Normally you will not need to use this directly, but
5403       * just use the standard high-level event callbacks like
5404       * {@link #onKeyDown(int, KeyEvent)}.
5405       */
5406      public KeyEvent.DispatcherState getKeyDispatcherState() {
5407          return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null;
5408      }
5409  
5410      /**
5411       * Dispatch a key event before it is processed by any input method
5412       * associated with the view hierarchy.  This can be used to intercept
5413       * key events in special situations before the IME consumes them; a
5414       * typical example would be handling the BACK key to update the application's
5415       * UI instead of allowing the IME to see it and close itself.
5416       *
5417       * @param event The key event to be dispatched.
5418       * @return True if the event was handled, false otherwise.
5419       */
5420      public boolean dispatchKeyEventPreIme(KeyEvent event) {
5421          return onKeyPreIme(event.getKeyCode(), event);
5422      }
5423  
5424      /**
5425       * Dispatch a key event to the next view on the focus path. This path runs
5426       * from the top of the view tree down to the currently focused view. If this
5427       * view has focus, it will dispatch to itself. Otherwise it will dispatch
5428       * the next node down the focus path. This method also fires any key
5429       * listeners.
5430       *
5431       * @param event The key event to be dispatched.
5432       * @return True if the event was handled, false otherwise.
5433       */
5434      public boolean dispatchKeyEvent(KeyEvent event) {
5435          if (mInputEventConsistencyVerifier != null) {
5436              mInputEventConsistencyVerifier.onKeyEvent(event, 0);
5437          }
5438  
5439          // Give any attached key listener a first crack at the event.
5440          //noinspection SimplifiableIfStatement
5441          if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
5442                  && mOnKeyListener.onKey(this, event.getKeyCode(), event)) {
5443              return true;
5444          }
5445  
5446          if (event.dispatch(this, mAttachInfo != null
5447                  ? mAttachInfo.mKeyDispatchState : null, this)) {
5448              return true;
5449          }
5450  
5451          if (mInputEventConsistencyVerifier != null) {
5452              mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
5453          }
5454          return false;
5455      }
5456  
5457      /**
5458       * Dispatches a key shortcut event.
5459       *
5460       * @param event The key event to be dispatched.
5461       * @return True if the event was handled by the view, false otherwise.
5462       */
5463      public boolean dispatchKeyShortcutEvent(KeyEvent event) {
5464          return onKeyShortcut(event.getKeyCode(), event);
5465      }
5466  
5467      /**
5468       * Pass the touch screen motion event down to the target view, or this
5469       * view if it is the target.
5470       *
5471       * @param event The motion event to be dispatched.
5472       * @return True if the event was handled by the view, false otherwise.
5473       */
5474      public boolean dispatchTouchEvent(MotionEvent event) {
5475          if (mInputEventConsistencyVerifier != null) {
5476              mInputEventConsistencyVerifier.onTouchEvent(event, 0);
5477          }
5478  
5479          if (onFilterTouchEventForSecurity(event)) {
5480              //noinspection SimplifiableIfStatement
5481              if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED &&
5482                      mOnTouchListener.onTouch(this, event)) {
5483                  return true;
5484              }
5485  
5486              if (onTouchEvent(event)) {
5487                  return true;
5488              }
5489          }
5490  
5491          if (mInputEventConsistencyVerifier != null) {
5492              mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
5493          }
5494          return false;
5495      }
5496  
5497      /**
5498       * Filter the touch event to apply security policies.
5499       *
5500       * @param event The motion event to be filtered.
5501       * @return True if the event should be dispatched, false if the event should be dropped.
5502       *
5503       * @see #getFilterTouchesWhenObscured
5504       */
5505      public boolean onFilterTouchEventForSecurity(MotionEvent event) {
5506          //noinspection RedundantIfStatement
5507          if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0
5508                  && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) {
5509              // Window is obscured, drop this touch.
5510              return false;
5511          }
5512          return true;
5513      }
5514  
5515      /**
5516       * Pass a trackball motion event down to the focused view.
5517       *
5518       * @param event The motion event to be dispatched.
5519       * @return True if the event was handled by the view, false otherwise.
5520       */
5521      public boolean dispatchTrackballEvent(MotionEvent event) {
5522          if (mInputEventConsistencyVerifier != null) {
5523              mInputEventConsistencyVerifier.onTrackballEvent(event, 0);
5524          }
5525  
5526          return onTrackballEvent(event);
5527      }
5528  
5529      /**
5530       * Dispatch a generic motion event.
5531       * <p>
5532       * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER}
5533       * are delivered to the view under the pointer.  All other generic motion events are
5534       * delivered to the focused view.  Hover events are handled specially and are delivered
5535       * to {@link #onHoverEvent(MotionEvent)}.
5536       * </p>
5537       *
5538       * @param event The motion event to be dispatched.
5539       * @return True if the event was handled by the view, false otherwise.
5540       */
5541      public boolean dispatchGenericMotionEvent(MotionEvent event) {
5542          if (mInputEventConsistencyVerifier != null) {
5543              mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0);
5544          }
5545  
5546          final int source = event.getSource();
5547          if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) {
5548              final int action = event.getAction();
5549              if (action == MotionEvent.ACTION_HOVER_ENTER
5550                      || action == MotionEvent.ACTION_HOVER_MOVE
5551                      || action == MotionEvent.ACTION_HOVER_EXIT) {
5552                  if (dispatchHoverEvent(event)) {
5553                      return true;
5554                  }
5555              } else if (dispatchGenericPointerEvent(event)) {
5556                  return true;
5557              }
5558          } else if (dispatchGenericFocusedEvent(event)) {
5559              return true;
5560          }
5561  
5562          if (dispatchGenericMotionEventInternal(event)) {
5563              return true;
5564          }
5565  
5566          if (mInputEventConsistencyVerifier != null) {
5567              mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
5568          }
5569          return false;
5570      }
5571  
5572      private boolean dispatchGenericMotionEventInternal(MotionEvent event) {
5573          //noinspection SimplifiableIfStatement
5574          if (mOnGenericMotionListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
5575                  && mOnGenericMotionListener.onGenericMotion(this, event)) {
5576              return true;
5577          }
5578  
5579          if (onGenericMotionEvent(event)) {
5580              return true;
5581          }
5582  
5583          if (mInputEventConsistencyVerifier != null) {
5584              mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
5585          }
5586          return false;
5587      }
5588  
5589      /**
5590       * Dispatch a hover event.
5591       * <p>
5592       * Do not call this method directly.
5593       * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
5594       * </p>
5595       *
5596       * @param event The motion event to be dispatched.
5597       * @return True if the event was handled by the view, false otherwise.
5598       */
5599      protected boolean dispatchHoverEvent(MotionEvent event) {
5600          //noinspection SimplifiableIfStatement
5601          if (mOnHoverListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
5602                  && mOnHoverListener.onHover(this, event)) {
5603              return true;
5604          }
5605  
5606          return onHoverEvent(event);
5607      }
5608  
5609      /**
5610       * Returns true if the view has a child to which it has recently sent
5611       * {@link MotionEvent#ACTION_HOVER_ENTER}.  If this view is hovered and
5612       * it does not have a hovered child, then it must be the innermost hovered view.
5613       * @hide
5614       */
5615      protected boolean hasHoveredChild() {
5616          return false;
5617      }
5618  
5619      /**
5620       * Dispatch a generic motion event to the view under the first pointer.
5621       * <p>
5622       * Do not call this method directly.
5623       * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
5624       * </p>
5625       *
5626       * @param event The motion event to be dispatched.
5627       * @return True if the event was handled by the view, false otherwise.
5628       */
5629      protected boolean dispatchGenericPointerEvent(MotionEvent event) {
5630          return false;
5631      }
5632  
5633      /**
5634       * Dispatch a generic motion event to the currently focused view.
5635       * <p>
5636       * Do not call this method directly.
5637       * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
5638       * </p>
5639       *
5640       * @param event The motion event to be dispatched.
5641       * @return True if the event was handled by the view, false otherwise.
5642       */
5643      protected boolean dispatchGenericFocusedEvent(MotionEvent event) {
5644          return false;
5645      }
5646  
5647      /**
5648       * Dispatch a pointer event.
5649       * <p>
5650       * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all
5651       * other events to {@link #onGenericMotionEvent(MotionEvent)}.  This separation of concerns
5652       * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches
5653       * and should not be expected to handle other pointing device features.
5654       * </p>
5655       *
5656       * @param event The motion event to be dispatched.
5657       * @return True if the event was handled by the view, false otherwise.
5658       * @hide
5659       */
5660      public final boolean dispatchPointerEvent(MotionEvent event) {
5661          if (event.isTouchEvent()) {
5662              return dispatchTouchEvent(event);
5663          } else {
5664              return dispatchGenericMotionEvent(event);
5665          }
5666      }
5667  
5668      /**
5669       * Called when the window containing this view gains or loses window focus.
5670       * ViewGroups should override to route to their children.
5671       *
5672       * @param hasFocus True if the window containing this view now has focus,
5673       *        false otherwise.
5674       */
5675      public void dispatchWindowFocusChanged(boolean hasFocus) {
5676          onWindowFocusChanged(hasFocus);
5677      }
5678  
5679      /**
5680       * Called when the window containing this view gains or loses focus.  Note
5681       * that this is separate from view focus: to receive key events, both
5682       * your view and its window must have focus.  If a window is displayed
5683       * on top of yours that takes input focus, then your own window will lose
5684       * focus but the view focus will remain unchanged.
5685       *
5686       * @param hasWindowFocus True if the window containing this view now has
5687       *        focus, false otherwise.
5688       */
5689      public void onWindowFocusChanged(boolean hasWindowFocus) {
5690          InputMethodManager imm = InputMethodManager.peekInstance();
5691          if (!hasWindowFocus) {
5692              if (isPressed()) {
5693                  setPressed(false);
5694              }
5695              if (imm != null && (mPrivateFlags & FOCUSED) != 0) {
5696                  imm.focusOut(this);
5697              }
5698              removeLongPressCallback();
5699              removeTapCallback();
5700              onFocusLost();
5701          } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) {
5702              imm.focusIn(this);
5703          }
5704          refreshDrawableState();
5705      }
5706  
5707      /**
5708       * Returns true if this view is in a window that currently has window focus.
5709       * Note that this is not the same as the view itself having focus.
5710       *
5711       * @return True if this view is in a window that currently has window focus.
5712       */
5713      public boolean hasWindowFocus() {
5714          return mAttachInfo != null && mAttachInfo.mHasWindowFocus;
5715      }
5716  
5717      /**
5718       * Dispatch a view visibility change down the view hierarchy.
5719       * ViewGroups should override to route to their children.
5720       * @param changedView The view whose visibility changed. Could be 'this' or
5721       * an ancestor view.
5722       * @param visibility The new visibility of changedView: {@link #VISIBLE},
5723       * {@link #INVISIBLE} or {@link #GONE}.
5724       */
5725      protected void dispatchVisibilityChanged(View changedView, int visibility) {
5726          onVisibilityChanged(changedView, visibility);
5727      }
5728  
5729      /**
5730       * Called when the visibility of the view or an ancestor of the view is changed.
5731       * @param changedView The view whose visibility changed. Could be 'this' or
5732       * an ancestor view.
5733       * @param visibility The new visibility of changedView: {@link #VISIBLE},
5734       * {@link #INVISIBLE} or {@link #GONE}.
5735       */
5736      protected void onVisibilityChanged(View changedView, int visibility) {
5737          if (visibility == VISIBLE) {
5738              if (mAttachInfo != null) {
5739                  initialAwakenScrollBars();
5740              } else {
5741                  mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH;
5742              }
5743          }
5744      }
5745  
5746      /**
5747       * Dispatch a hint about whether this view is displayed. For instance, when
5748       * a View moves out of the screen, it might receives a display hint indicating
5749       * the view is not displayed. Applications should not <em>rely</em> on this hint
5750       * as there is no guarantee that they will receive one.
5751       *
5752       * @param hint A hint about whether or not this view is displayed:
5753       * {@link #VISIBLE} or {@link #INVISIBLE}.
5754       */
5755      public void dispatchDisplayHint(int hint) {
5756          onDisplayHint(hint);
5757      }
5758  
5759      /**
5760       * Gives this view a hint about whether is displayed or not. For instance, when
5761       * a View moves out of the screen, it might receives a display hint indicating
5762       * the view is not displayed. Applications should not <em>rely</em> on this hint
5763       * as there is no guarantee that they will receive one.
5764       *
5765       * @param hint A hint about whether or not this view is displayed:
5766       * {@link #VISIBLE} or {@link #INVISIBLE}.
5767       */
5768      protected void onDisplayHint(int hint) {
5769      }
5770  
5771      /**
5772       * Dispatch a window visibility change down the view hierarchy.
5773       * ViewGroups should override to route to their children.
5774       *
5775       * @param visibility The new visibility of the window.
5776       *
5777       * @see #onWindowVisibilityChanged(int)
5778       */
5779      public void dispatchWindowVisibilityChanged(int visibility) {
5780          onWindowVisibilityChanged(visibility);
5781      }
5782  
5783      /**
5784       * Called when the window containing has change its visibility
5785       * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}).  Note
5786       * that this tells you whether or not your window is being made visible
5787       * to the window manager; this does <em>not</em> tell you whether or not
5788       * your window is obscured by other windows on the screen, even if it
5789       * is itself visible.
5790       *
5791       * @param visibility The new visibility of the window.
5792       */
5793      protected void onWindowVisibilityChanged(int visibility) {
5794          if (visibility == VISIBLE) {
5795              initialAwakenScrollBars();
5796          }
5797      }
5798  
5799      /**
5800       * Returns the current visibility of the window this view is attached to
5801       * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}).
5802       *
5803       * @return Returns the current visibility of the view's window.
5804       */
5805      public int getWindowVisibility() {
5806          return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE;
5807      }
5808  
5809      /**
5810       * Retrieve the overall visible display size in which the window this view is
5811       * attached to has been positioned in.  This takes into account screen
5812       * decorations above the window, for both cases where the window itself
5813       * is being position inside of them or the window is being placed under
5814       * then and covered insets are used for the window to position its content
5815       * inside.  In effect, this tells you the available area where content can
5816       * be placed and remain visible to users.
5817       *
5818       * <p>This function requires an IPC back to the window manager to retrieve
5819       * the requested information, so should not be used in performance critical
5820       * code like drawing.
5821       *
5822       * @param outRect Filled in with the visible display frame.  If the view
5823       * is not attached to a window, this is simply the raw display size.
5824       */
5825      public void getWindowVisibleDisplayFrame(Rect outRect) {
5826          if (mAttachInfo != null) {
5827              try {
5828                  mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect);
5829              } catch (RemoteException e) {
5830                  return;
5831              }
5832              // XXX This is really broken, and probably all needs to be done
5833              // in the window manager, and we need to know more about whether
5834              // we want the area behind or in front of the IME.
5835              final Rect insets = mAttachInfo.mVisibleInsets;
5836              outRect.left += insets.left;
5837              outRect.top += insets.top;
5838              outRect.right -= insets.right;
5839              outRect.bottom -= insets.bottom;
5840              return;
5841          }
5842          Display d = WindowManagerImpl.getDefault().getDefaultDisplay();
5843          d.getRectSize(outRect);
5844      }
5845  
5846      /**
5847       * Dispatch a notification about a resource configuration change down
5848       * the view hierarchy.
5849       * ViewGroups should override to route to their children.
5850       *
5851       * @param newConfig The new resource configuration.
5852       *
5853       * @see #onConfigurationChanged(android.content.res.Configuration)
5854       */
5855      public void dispatchConfigurationChanged(Configuration newConfig) {
5856          onConfigurationChanged(newConfig);
5857      }
5858  
5859      /**
5860       * Called when the current configuration of the resources being used
5861       * by the application have changed.  You can use this to decide when
5862       * to reload resources that can changed based on orientation and other
5863       * configuration characterstics.  You only need to use this if you are
5864       * not relying on the normal {@link android.app.Activity} mechanism of
5865       * recreating the activity instance upon a configuration change.
5866       *
5867       * @param newConfig The new resource configuration.
5868       */
5869      protected void onConfigurationChanged(Configuration newConfig) {
5870      }
5871  
5872      /**
5873       * Private function to aggregate all per-view attributes in to the view
5874       * root.
5875       */
5876      void dispatchCollectViewAttributes(int visibility) {
5877          performCollectViewAttributes(visibility);
5878      }
5879  
5880      void performCollectViewAttributes(int visibility) {
5881          if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) {
5882              if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) {
5883                  mAttachInfo.mKeepScreenOn = true;
5884              }
5885              mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility;
5886              if (mOnSystemUiVisibilityChangeListener != null) {
5887                  mAttachInfo.mHasSystemUiListeners = true;
5888              }
5889          }
5890      }
5891  
5892      void needGlobalAttributesUpdate(boolean force) {
5893          final AttachInfo ai = mAttachInfo;
5894          if (ai != null) {
5895              if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0)
5896                      || ai.mHasSystemUiListeners) {
5897                  ai.mRecomputeGlobalAttributes = true;
5898              }
5899          }
5900      }
5901  
5902      /**
5903       * Returns whether the device is currently in touch mode.  Touch mode is entered
5904       * once the user begins interacting with the device by touch, and affects various
5905       * things like whether focus is always visible to the user.
5906       *
5907       * @return Whether the device is in touch mode.
5908       */
5909      @ViewDebug.ExportedProperty
5910      public boolean isInTouchMode() {
5911          if (mAttachInfo != null) {
5912              return mAttachInfo.mInTouchMode;
5913          } else {
5914              return ViewRootImpl.isInTouchMode();
5915          }
5916      }
5917  
5918      /**
5919       * Returns the context the view is running in, through which it can
5920       * access the current theme, resources, etc.
5921       *
5922       * @return The view's Context.
5923       */
5924      @ViewDebug.CapturedViewProperty
5925      public final Context getContext() {
5926          return mContext;
5927      }
5928  
5929      /**
5930       * Handle a key event before it is processed by any input method
5931       * associated with the view hierarchy.  This can be used to intercept
5932       * key events in special situations before the IME consumes them; a
5933       * typical example would be handling the BACK key to update the application's
5934       * UI instead of allowing the IME to see it and close itself.
5935       *
5936       * @param keyCode The value in event.getKeyCode().
5937       * @param event Description of the key event.
5938       * @return If you handled the event, return true. If you want to allow the
5939       *         event to be handled by the next receiver, return false.
5940       */
5941      public boolean onKeyPreIme(int keyCode, KeyEvent event) {
5942          return false;
5943      }
5944  
5945      /**
5946       * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent)
5947       * KeyEvent.Callback.onKeyDown()}: perform press of the view
5948       * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER}
5949       * is released, if the view is enabled and clickable.
5950       *
5951       * @param keyCode A key code that represents the button pressed, from
5952       *                {@link android.view.KeyEvent}.
5953       * @param event   The KeyEvent object that defines the button action.
5954       */
5955      public boolean onKeyDown(int keyCode, KeyEvent event) {
5956          boolean result = false;
5957  
5958          switch (keyCode) {
5959              case KeyEvent.KEYCODE_DPAD_CENTER:
5960              case KeyEvent.KEYCODE_ENTER: {
5961                  if ((mViewFlags & ENABLED_MASK) == DISABLED) {
5962                      return true;
5963                  }
5964                  // Long clickable items don't necessarily have to be clickable
5965                  if (((mViewFlags & CLICKABLE) == CLICKABLE ||
5966                          (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) &&
5967                          (event.getRepeatCount() == 0)) {
5968                      setPressed(true);
5969                      checkForLongClick(0);
5970                      return true;
5971                  }
5972                  break;
5973              }
5974          }
5975          return result;
5976      }
5977  
5978      /**
5979       * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent)
5980       * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle
5981       * the event).
5982       */
5983      public boolean onKeyLongPress(int keyCode, KeyEvent event) {
5984          return false;
5985      }
5986  
5987      /**
5988       * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent)
5989       * KeyEvent.Callback.onKeyUp()}: perform clicking of the view
5990       * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or
5991       * {@link KeyEvent#KEYCODE_ENTER} is released.
5992       *
5993       * @param keyCode A key code that represents the button pressed, from
5994       *                {@link android.view.KeyEvent}.
5995       * @param event   The KeyEvent object that defines the button action.
5996       */
5997      public boolean onKeyUp(int keyCode, KeyEvent event) {
5998          boolean result = false;
5999  
6000          switch (keyCode) {
6001              case KeyEvent.KEYCODE_DPAD_CENTER:
6002              case KeyEvent.KEYCODE_ENTER: {
6003                  if ((mViewFlags & ENABLED_MASK) == DISABLED) {
6004                      return true;
6005                  }
6006                  if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) {
6007                      setPressed(false);
6008  
6009                      if (!mHasPerformedLongPress) {
6010                          // This is a tap, so remove the longpress check
6011                          removeLongPressCallback();
6012  
6013                          result = performClick();
6014                      }
6015                  }
6016                  break;
6017              }
6018          }
6019          return result;
6020      }
6021  
6022      /**
6023       * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent)
6024       * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle
6025       * the event).
6026       *
6027       * @param keyCode     A key code that represents the button pressed, from
6028       *                    {@link android.view.KeyEvent}.
6029       * @param repeatCount The number of times the action was made.
6030       * @param event       The KeyEvent object that defines the button action.
6031       */
6032      public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
6033          return false;
6034      }
6035  
6036      /**
6037       * Called on the focused view when a key shortcut event is not handled.
6038       * Override this method to implement local key shortcuts for the View.
6039       * Key shortcuts can also be implemented by setting the
6040       * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items.
6041       *
6042       * @param keyCode The value in event.getKeyCode().
6043       * @param event Description of the key event.
6044       * @return If you handled the event, return true. If you want to allow the
6045       *         event to be handled by the next receiver, return false.
6046       */
6047      public boolean onKeyShortcut(int keyCode, KeyEvent event) {
6048          return false;
6049      }
6050  
6051      /**
6052       * Check whether the called view is a text editor, in which case it
6053       * would make sense to automatically display a soft input window for
6054       * it.  Subclasses should override this if they implement
6055       * {@link #onCreateInputConnection(EditorInfo)} to return true if
6056       * a call on that method would return a non-null InputConnection, and
6057       * they are really a first-class editor that the user would normally
6058       * start typing on when the go into a window containing your view.
6059       *
6060       * <p>The default implementation always returns false.  This does
6061       * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)}
6062       * will not be called or the user can not otherwise perform edits on your
6063       * view; it is just a hint to the system that this is not the primary
6064       * purpose of this view.
6065       *
6066       * @return Returns true if this view is a text editor, else false.
6067       */
6068      public boolean onCheckIsTextEditor() {
6069          return false;
6070      }
6071  
6072      /**
6073       * Create a new InputConnection for an InputMethod to interact
6074       * with the view.  The default implementation returns null, since it doesn't
6075       * support input methods.  You can override this to implement such support.
6076       * This is only needed for views that take focus and text input.
6077       *
6078       * <p>When implementing this, you probably also want to implement
6079       * {@link #onCheckIsTextEditor()} to indicate you will return a
6080       * non-null InputConnection.
6081       *
6082       * @param outAttrs Fill in with attribute information about the connection.
6083       */
6084      public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
6085          return null;
6086      }
6087  
6088      /**
6089       * Called by the {@link android.view.inputmethod.InputMethodManager}
6090       * when a view who is not the current
6091       * input connection target is trying to make a call on the manager.  The
6092       * default implementation returns false; you can override this to return
6093       * true for certain views if you are performing InputConnection proxying
6094       * to them.
6095       * @param view The View that is making the InputMethodManager call.
6096       * @return Return true to allow the call, false to reject.
6097       */
6098      public boolean checkInputConnectionProxy(View view) {
6099          return false;
6100      }
6101  
6102      /**
6103       * Show the context menu for this view. It is not safe to hold on to the
6104       * menu after returning from this method.
6105       *
6106       * You should normally not overload this method. Overload
6107       * {@link #onCreateContextMenu(ContextMenu)} or define an
6108       * {@link OnCreateContextMenuListener} to add items to the context menu.
6109       *
6110       * @param menu The context menu to populate
6111       */
6112      public void createContextMenu(ContextMenu menu) {
6113          ContextMenuInfo menuInfo = getContextMenuInfo();
6114  
6115          // Sets the current menu info so all items added to menu will have
6116          // my extra info set.
6117          ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo);
6118  
6119          onCreateContextMenu(menu);
6120          if (mOnCreateContextMenuListener != null) {
6121              mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo);
6122          }
6123  
6124          // Clear the extra information so subsequent items that aren't mine don't
6125          // have my extra info.
6126          ((MenuBuilder)menu).setCurrentMenuInfo(null);
6127  
6128          if (mParent != null) {
6129              mParent.createContextMenu(menu);
6130          }
6131      }
6132  
6133      /**
6134       * Views should implement this if they have extra information to associate
6135       * with the context menu. The return result is supplied as a parameter to
6136       * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)}
6137       * callback.
6138       *
6139       * @return Extra information about the item for which the context menu
6140       *         should be shown. This information will vary across different
6141       *         subclasses of View.
6142       */
6143      protected ContextMenuInfo getContextMenuInfo() {
6144          return null;
6145      }
6146  
6147      /**
6148       * Views should implement this if the view itself is going to add items to
6149       * the context menu.
6150       *
6151       * @param menu the context menu to populate
6152       */
6153      protected void onCreateContextMenu(ContextMenu menu) {
6154      }
6155  
6156      /**
6157       * Implement this method to handle trackball motion events.  The
6158       * <em>relative</em> movement of the trackball since the last event
6159       * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and
6160       * {@link MotionEvent#getY MotionEvent.getY()}.  These are normalized so
6161       * that a movement of 1 corresponds to the user pressing one DPAD key (so
6162       * they will often be fractional values, representing the more fine-grained
6163       * movement information available from a trackball).
6164       *
6165       * @param event The motion event.
6166       * @return True if the event was handled, false otherwise.
6167       */
6168      public boolean onTrackballEvent(MotionEvent event) {
6169          return false;
6170      }
6171  
6172      /**
6173       * Implement this method to handle generic motion events.
6174       * <p>
6175       * Generic motion events describe joystick movements, mouse hovers, track pad
6176       * touches, scroll wheel movements and other input events.  The
6177       * {@link MotionEvent#getSource() source} of the motion event specifies
6178       * the class of input that was received.  Implementations of this method
6179       * must examine the bits in the source before processing the event.
6180       * The following code example shows how this is done.
6181       * </p><p>
6182       * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER}
6183       * are delivered to the view under the pointer.  All other generic motion events are
6184       * delivered to the focused view.
6185       * </p>
6186       * <pre> public boolean onGenericMotionEvent(MotionEvent event) {
6187       *     if ((event.getSource() &amp; InputDevice.SOURCE_CLASS_JOYSTICK) != 0) {
6188       *         if (event.getAction() == MotionEvent.ACTION_MOVE) {
6189       *             // process the joystick movement...
6190       *             return true;
6191       *         }
6192       *     }
6193       *     if ((event.getSource() &amp; InputDevice.SOURCE_CLASS_POINTER) != 0) {
6194       *         switch (event.getAction()) {
6195       *             case MotionEvent.ACTION_HOVER_MOVE:
6196       *                 // process the mouse hover movement...
6197       *                 return true;
6198       *             case MotionEvent.ACTION_SCROLL:
6199       *                 // process the scroll wheel movement...
6200       *                 return true;
6201       *         }
6202       *     }
6203       *     return super.onGenericMotionEvent(event);
6204       * }</pre>
6205       *
6206       * @param event The generic motion event being processed.
6207       * @return True if the event was handled, false otherwise.
6208       */
6209      public boolean onGenericMotionEvent(MotionEvent event) {
6210          return false;
6211      }
6212  
6213      /**
6214       * Implement this method to handle hover events.
6215       * <p>
6216       * This method is called whenever a pointer is hovering into, over, or out of the
6217       * bounds of a view and the view is not currently being touched.
6218       * Hover events are represented as pointer events with action
6219       * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE},
6220       * or {@link MotionEvent#ACTION_HOVER_EXIT}.
6221       * </p>
6222       * <ul>
6223       * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER}
6224       * when the pointer enters the bounds of the view.</li>
6225       * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE}
6226       * when the pointer has already entered the bounds of the view and has moved.</li>
6227       * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT}
6228       * when the pointer has exited the bounds of the view or when the pointer is
6229       * about to go down due to a button click, tap, or similar user action that
6230       * causes the view to be touched.</li>
6231       * </ul>
6232       * <p>
6233       * The view should implement this method to return true to indicate that it is
6234       * handling the hover event, such as by changing its drawable state.
6235       * </p><p>
6236       * The default implementation calls {@link #setHovered} to update the hovered state
6237       * of the view when a hover enter or hover exit event is received, if the view
6238       * is enabled and is clickable.  The default implementation also sends hover
6239       * accessibility events.
6240       * </p>
6241       *
6242       * @param event The motion event that describes the hover.
6243       * @return True if the view handled the hover event.
6244       *
6245       * @see #isHovered
6246       * @see #setHovered
6247       * @see #onHoverChanged
6248       */
6249      public boolean onHoverEvent(MotionEvent event) {
6250          // The root view may receive hover (or touch) events that are outside the bounds of
6251          // the window.  This code ensures that we only send accessibility events for
6252          // hovers that are actually within the bounds of the root view.
6253          final int action = event.getAction();
6254          if (!mSendingHoverAccessibilityEvents) {
6255              if ((action == MotionEvent.ACTION_HOVER_ENTER
6256                      || action == MotionEvent.ACTION_HOVER_MOVE)
6257                      && !hasHoveredChild()
6258                      && pointInView(event.getX(), event.getY())) {
6259                  mSendingHoverAccessibilityEvents = true;
6260                  sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER);
6261              }
6262          } else {
6263              if (action == MotionEvent.ACTION_HOVER_EXIT
6264                      || (action == MotionEvent.ACTION_HOVER_MOVE
6265                              && !pointInView(event.getX(), event.getY()))) {
6266                  mSendingHoverAccessibilityEvents = false;
6267                  sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT);
6268              }
6269          }
6270  
6271          if (isHoverable()) {
6272              switch (action) {
6273                  case MotionEvent.ACTION_HOVER_ENTER:
6274                      setHovered(true);
6275                      break;
6276                  case MotionEvent.ACTION_HOVER_EXIT:
6277                      setHovered(false);
6278                      break;
6279              }
6280  
6281              // Dispatch the event to onGenericMotionEvent before returning true.
6282              // This is to provide compatibility with existing applications that
6283              // handled HOVER_MOVE events in onGenericMotionEvent and that would
6284              // break because of the new default handling for hoverable views
6285              // in onHoverEvent.
6286              // Note that onGenericMotionEvent will be called by default when
6287              // onHoverEvent returns false (refer to dispatchGenericMotionEvent).
6288              dispatchGenericMotionEventInternal(event);
6289              return true;
6290          }
6291          return false;
6292      }
6293  
6294      /**
6295       * Returns true if the view should handle {@link #onHoverEvent}
6296       * by calling {@link #setHovered} to change its hovered state.
6297       *
6298       * @return True if the view is hoverable.
6299       */
6300      private boolean isHoverable() {
6301          final int viewFlags = mViewFlags;
6302          //noinspection SimplifiableIfStatement
6303          if ((viewFlags & ENABLED_MASK) == DISABLED) {
6304              return false;
6305          }
6306  
6307          return (viewFlags & CLICKABLE) == CLICKABLE
6308                  || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE;
6309      }
6310  
6311      /**
6312       * Returns true if the view is currently hovered.
6313       *
6314       * @return True if the view is currently hovered.
6315       *
6316       * @see #setHovered
6317       * @see #onHoverChanged
6318       */
6319      @ViewDebug.ExportedProperty
6320      public boolean isHovered() {
6321          return (mPrivateFlags & HOVERED) != 0;
6322      }
6323  
6324      /**
6325       * Sets whether the view is currently hovered.
6326       * <p>
6327       * Calling this method also changes the drawable state of the view.  This
6328       * enables the view to react to hover by using different drawable resources
6329       * to change its appearance.
6330       * </p><p>
6331       * The {@link #onHoverChanged} method is called when the hovered state changes.
6332       * </p>
6333       *
6334       * @param hovered True if the view is hovered.
6335       *
6336       * @see #isHovered
6337       * @see #onHoverChanged
6338       */
6339      public void setHovered(boolean hovered) {
6340          if (hovered) {
6341              if ((mPrivateFlags & HOVERED) == 0) {
6342                  mPrivateFlags |= HOVERED;
6343                  refreshDrawableState();
6344                  onHoverChanged(true);
6345              }
6346          } else {
6347              if ((mPrivateFlags & HOVERED) != 0) {
6348                  mPrivateFlags &= ~HOVERED;
6349                  refreshDrawableState();
6350                  onHoverChanged(false);
6351              }
6352          }
6353      }
6354  
6355      /**
6356       * Implement this method to handle hover state changes.
6357       * <p>
6358       * This method is called whenever the hover state changes as a result of a
6359       * call to {@link #setHovered}.
6360       * </p>
6361       *
6362       * @param hovered The current hover state, as returned by {@link #isHovered}.
6363       *
6364       * @see #isHovered
6365       * @see #setHovered
6366       */
6367      public void onHoverChanged(boolean hovered) {
6368      }
6369  
6370      /**
6371       * Implement this method to handle touch screen motion events.
6372       *
6373       * @param event The motion event.
6374       * @return True if the event was handled, false otherwise.
6375       */
6376      public boolean onTouchEvent(MotionEvent event) {
6377          final int viewFlags = mViewFlags;
6378  
6379          if ((viewFlags & ENABLED_MASK) == DISABLED) {
6380              if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) {
6381                  mPrivateFlags &= ~PRESSED;
6382                  refreshDrawableState();
6383              }
6384              // A disabled view that is clickable still consumes the touch
6385              // events, it just doesn't respond to them.
6386              return (((viewFlags & CLICKABLE) == CLICKABLE ||
6387                      (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE));
6388          }
6389  
6390          if (mTouchDelegate != null) {
6391              if (mTouchDelegate.onTouchEvent(event)) {
6392                  return true;
6393              }
6394          }
6395  
6396          if (((viewFlags & CLICKABLE) == CLICKABLE ||
6397                  (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) {
6398              switch (event.getAction()) {
6399                  case MotionEvent.ACTION_UP:
6400                      boolean prepressed = (mPrivateFlags & PREPRESSED) != 0;
6401                      if ((mPrivateFlags & PRESSED) != 0 || prepressed) {
6402                          // take focus if we don't have it already and we should in
6403                          // touch mode.
6404                          boolean focusTaken = false;
6405                          if (isFocusable() && isFocusableInTouchMode() && !isFocused()) {
6406                              focusTaken = requestFocus();
6407                          }
6408  
6409                          if (prepressed) {
6410                              // The button is being released before we actually
6411                              // showed it as pressed.  Make it show the pressed
6412                              // state now (before scheduling the click) to ensure
6413                              // the user sees it.
6414                              mPrivateFlags |= PRESSED;
6415                              refreshDrawableState();
6416                         }
6417  
6418                          if (!mHasPerformedLongPress) {
6419                              // This is a tap, so remove the longpress check
6420                              removeLongPressCallback();
6421  
6422                              // Only perform take click actions if we were in the pressed state
6423                              if (!focusTaken) {
6424                                  // Use a Runnable and post this rather than calling
6425                                  // performClick directly. This lets other visual state
6426                                  // of the view update before click actions start.
6427                                  if (mPerformClick == null) {
6428                                      mPerformClick = new PerformClick();
6429                                  }
6430                                  if (!post(mPerformClick)) {
6431                                      performClick();
6432                                  }
6433                              }
6434                          }
6435  
6436                          if (mUnsetPressedState == null) {
6437                              mUnsetPressedState = new UnsetPressedState();
6438                          }
6439  
6440                          if (prepressed) {
6441                              postDelayed(mUnsetPressedState,
6442                                      ViewConfiguration.getPressedStateDuration());
6443                          } else if (!post(mUnsetPressedState)) {
6444                              // If the post failed, unpress right now
6445                              mUnsetPressedState.run();
6446                          }
6447                          removeTapCallback();
6448                      }
6449                      break;
6450  
6451                  case MotionEvent.ACTION_DOWN:
6452                      mHasPerformedLongPress = false;
6453  
6454                      if (performButtonActionOnTouchDown(event)) {
6455                          break;
6456                      }
6457  
6458                      // Walk up the hierarchy to determine if we're inside a scrolling container.
6459                      boolean isInScrollingContainer = isInScrollingContainer();
6460  
6461                      // For views inside a scrolling container, delay the pressed feedback for
6462                      // a short period in case this is a scroll.
6463                      if (isInScrollingContainer) {
6464                          mPrivateFlags |= PREPRESSED;
6465                          if (mPendingCheckForTap == null) {
6466                              mPendingCheckForTap = new CheckForTap();
6467                          }
6468                          postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
6469                      } else {
6470                          // Not inside a scrolling container, so show the feedback right away
6471                          mPrivateFlags |= PRESSED;
6472                          refreshDrawableState();
6473                          checkForLongClick(0);
6474                      }
6475                      break;
6476  
6477                  case MotionEvent.ACTION_CANCEL:
6478                      mPrivateFlags &= ~PRESSED;
6479                      refreshDrawableState();
6480                      removeTapCallback();
6481                      break;
6482  
6483                  case MotionEvent.ACTION_MOVE:
6484                      final int x = (int) event.getX();
6485                      final int y = (int) event.getY();
6486  
6487                      // Be lenient about moving outside of buttons
6488                      if (!pointInView(x, y, mTouchSlop)) {
6489                          // Outside button
6490                          removeTapCallback();
6491                          if ((mPrivateFlags & PRESSED) != 0) {
6492                              // Remove any future long press/tap checks
6493                              removeLongPressCallback();
6494  
6495                              // Need to switch from pressed to not pressed
6496                              mPrivateFlags &= ~PRESSED;
6497                              refreshDrawableState();
6498                          }
6499                      }
6500                      break;
6501              }
6502              return true;
6503          }
6504  
6505          return false;
6506      }
6507  
6508      /**
6509       * @hide
6510       */
6511      public boolean isInScrollingContainer() {
6512          ViewParent p = getParent();
6513          while (p != null && p instanceof ViewGroup) {
6514              if (((ViewGroup) p).shouldDelayChildPressedState()) {
6515                  return true;
6516              }
6517              p = p.getParent();
6518          }
6519          return false;
6520      }
6521  
6522      /**
6523       * Remove the longpress detection timer.
6524       */
6525      private void removeLongPressCallback() {
6526          if (mPendingCheckForLongPress != null) {
6527            removeCallbacks(mPendingCheckForLongPress);
6528          }
6529      }
6530  
6531      /**
6532       * Remove the pending click action
6533       */
6534      private void removePerformClickCallback() {
6535          if (mPerformClick != null) {
6536              removeCallbacks(mPerformClick);
6537          }
6538      }
6539  
6540      /**
6541       * Remove the prepress detection timer.
6542       */
6543      private void removeUnsetPressCallback() {
6544          if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) {
6545              setPressed(false);
6546              removeCallbacks(mUnsetPressedState);
6547          }
6548      }
6549  
6550      /**
6551       * Remove the tap detection timer.
6552       */
6553      private void removeTapCallback() {
6554          if (mPendingCheckForTap != null) {
6555              mPrivateFlags &= ~PREPRESSED;
6556              removeCallbacks(mPendingCheckForTap);
6557          }
6558      }
6559  
6560      /**
6561       * Cancels a pending long press.  Your subclass can use this if you
6562       * want the context menu to come up if the user presses and holds
6563       * at the same place, but you don't want it to come up if they press
6564       * and then move around enough to cause scrolling.
6565       */
6566      public void cancelLongPress() {
6567          removeLongPressCallback();
6568  
6569          /*
6570           * The prepressed state handled by the tap callback is a display
6571           * construct, but the tap callback will post a long press callback
6572           * less its own timeout. Remove it here.
6573           */
6574          removeTapCallback();
6575      }
6576  
6577      /**
6578       * Remove the pending callback for sending a
6579       * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event.
6580       */
6581      private void removeSendViewScrolledAccessibilityEventCallback() {
6582          if (mSendViewScrolledAccessibilityEvent != null) {
6583              removeCallbacks(mSendViewScrolledAccessibilityEvent);
6584          }
6585      }
6586  
6587      /**
6588       * Sets the TouchDelegate for this View.
6589       */
6590      public void setTouchDelegate(TouchDelegate delegate) {
6591          mTouchDelegate = delegate;
6592      }
6593  
6594      /**
6595       * Gets the TouchDelegate for this View.
6596       */
6597      public TouchDelegate getTouchDelegate() {
6598          return mTouchDelegate;
6599      }
6600  
6601      /**
6602       * Set flags controlling behavior of this view.
6603       *
6604       * @param flags Constant indicating the value which should be set
6605       * @param mask Constant indicating the bit range that should be changed
6606       */
6607      void setFlags(int flags, int mask) {
6608          int old = mViewFlags;
6609          mViewFlags = (mViewFlags & ~mask) | (flags & mask);
6610  
6611          int changed = mViewFlags ^ old;
6612          if (changed == 0) {
6613              return;
6614          }
6615          int privateFlags = mPrivateFlags;
6616  
6617          /* Check if the FOCUSABLE bit has changed */
6618          if (((changed & FOCUSABLE_MASK) != 0) &&
6619                  ((privateFlags & HAS_BOUNDS) !=0)) {
6620              if (((old & FOCUSABLE_MASK) == FOCUSABLE)
6621                      && ((privateFlags & FOCUSED) != 0)) {
6622                  /* Give up focus if we are no longer focusable */
6623                  clearFocus();
6624              } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE)
6625                      && ((privateFlags & FOCUSED) == 0)) {
6626                  /*
6627                   * Tell the view system that we are now available to take focus
6628                   * if no one else already has it.
6629                   */
6630                  if (mParent != null) mParent.focusableViewAvailable(this);
6631              }
6632          }
6633  
6634          if ((flags & VISIBILITY_MASK) == VISIBLE) {
6635              if ((changed & VISIBILITY_MASK) != 0) {
6636                  /*
6637                   * If this view is becoming visible, invalidate it in case it changed while
6638                   * it was not visible. Marking it drawn ensures that the invalidation will
6639                   * go through.
6640                   */
6641                  mPrivateFlags |= DRAWN;
6642                  invalidate(true);
6643  
6644                  needGlobalAttributesUpdate(true);
6645  
6646                  // a view becoming visible is worth notifying the parent
6647                  // about in case nothing has focus.  even if this specific view
6648                  // isn't focusable, it may contain something that is, so let
6649                  // the root view try to give this focus if nothing else does.
6650                  if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) {
6651                      mParent.focusableViewAvailable(this);
6652                  }
6653              }
6654          }
6655  
6656          /* Check if the GONE bit has changed */
6657          if ((changed & GONE) != 0) {
6658              needGlobalAttributesUpdate(false);
6659              requestLayout();
6660  
6661              if (((mViewFlags & VISIBILITY_MASK) == GONE)) {
6662                  if (hasFocus()) clearFocus();
6663                  destroyDrawingCache();
6664                  if (mParent instanceof View) {
6665                      // GONE views noop invalidation, so invalidate the parent
6666                      ((View) mParent).invalidate(true);
6667                  }
6668                  // Mark the view drawn to ensure that it gets invalidated properly the next
6669                  // time it is visible and gets invalidated
6670                  mPrivateFlags |= DRAWN;
6671              }
6672              if (mAttachInfo != null) {
6673                  mAttachInfo.mViewVisibilityChanged = true;
6674              }
6675          }
6676  
6677          /* Check if the VISIBLE bit has changed */
6678          if ((changed & INVISIBLE) != 0) {
6679              needGlobalAttributesUpdate(false);
6680              /*
6681               * If this view is becoming invisible, set the DRAWN flag so that
6682               * the next invalidate() will not be skipped.
6683               */
6684              mPrivateFlags |= DRAWN;
6685  
6686              if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) {
6687                  // root view becoming invisible shouldn't clear focus
6688                  if (getRootView() != this) {
6689                      clearFocus();
6690                  }
6691              }
6692              if (mAttachInfo != null) {
6693                  mAttachInfo.mViewVisibilityChanged = true;
6694              }
6695          }
6696  
6697          if ((changed & VISIBILITY_MASK) != 0) {
6698              if (mParent instanceof ViewGroup) {
6699                  ((ViewGroup) mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK));
6700                  ((View) mParent).invalidate(true);
6701              } else if (mParent != null) {
6702                  mParent.invalidateChild(this, null);
6703              }
6704              dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK));
6705          }
6706  
6707          if ((changed & WILL_NOT_CACHE_DRAWING) != 0) {
6708              destroyDrawingCache();
6709          }
6710  
6711          if ((changed & DRAWING_CACHE_ENABLED) != 0) {
6712              destroyDrawingCache();
6713              mPrivateFlags &= ~DRAWING_CACHE_VALID;
6714              invalidateParentCaches();
6715          }
6716  
6717          if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) {
6718              destroyDrawingCache();
6719              mPrivateFlags &= ~DRAWING_CACHE_VALID;
6720          }
6721  
6722          if ((changed & DRAW_MASK) != 0) {
6723              if ((mViewFlags & WILL_NOT_DRAW) != 0) {
6724                  if (mBGDrawable != null) {
6725                      mPrivateFlags &= ~SKIP_DRAW;
6726                      mPrivateFlags |= ONLY_DRAWS_BACKGROUND;
6727                  } else {
6728                      mPrivateFlags |= SKIP_DRAW;
6729                  }
6730              } else {
6731                  mPrivateFlags &= ~SKIP_DRAW;
6732              }
6733              requestLayout();
6734              invalidate(true);
6735          }
6736  
6737          if ((changed & KEEP_SCREEN_ON) != 0) {
6738              if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
6739                  mParent.recomputeViewAttributes(this);
6740              }
6741          }
6742  
6743          if ((changed & LAYOUT_DIRECTION_MASK) != 0) {
6744              requestLayout();
6745          }
6746      }
6747  
6748      /**
6749       * Change the view's z order in the tree, so it's on top of other sibling
6750       * views
6751       */
6752      public void bringToFront() {
6753          if (mParent != null) {
6754              mParent.bringChildToFront(this);
6755          }
6756      }
6757  
6758      /**
6759       * This is called in response to an internal scroll in this view (i.e., the
6760       * view scrolled its own contents). This is typically as a result of
6761       * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been
6762       * called.
6763       *
6764       * @param l Current horizontal scroll origin.
6765       * @param t Current vertical scroll origin.
6766       * @param oldl Previous horizontal scroll origin.
6767       * @param oldt Previous vertical scroll origin.
6768       */
6769      protected void onScrollChanged(int l, int t, int oldl, int oldt) {
6770          if (AccessibilityManager.getInstance(mContext).isEnabled()) {
6771              postSendViewScrolledAccessibilityEventCallback();
6772          }
6773  
6774          mBackgroundSizeChanged = true;
6775  
6776          final AttachInfo ai = mAttachInfo;
6777          if (ai != null) {
6778              ai.mViewScrollChanged = true;
6779          }
6780      }
6781  
6782      /**
6783       * Interface definition for a callback to be invoked when the layout bounds of a view
6784       * changes due to layout processing.
6785       */
6786      public interface OnLayoutChangeListener {
6787          /**
6788           * Called when the focus state of a view has changed.
6789           *
6790           * @param v The view whose state has changed.
6791           * @param left The new value of the view's left property.
6792           * @param top The new value of the view's top property.
6793           * @param right The new value of the view's right property.
6794           * @param bottom The new value of the view's bottom property.
6795           * @param oldLeft The previous value of the view's left property.
6796           * @param oldTop The previous value of the view's top property.
6797           * @param oldRight The previous value of the view's right property.
6798           * @param oldBottom The previous value of the view's bottom property.
6799           */
6800          void onLayoutChange(View v, int left, int top, int right, int bottom,
6801              int oldLeft, int oldTop, int oldRight, int oldBottom);
6802      }
6803  
6804      /**
6805       * This is called during layout when the size of this view has changed. If
6806       * you were just added to the view hierarchy, you're called with the old
6807       * values of 0.
6808       *
6809       * @param w Current width of this view.
6810       * @param h Current height of this view.
6811       * @param oldw Old width of this view.
6812       * @param oldh Old height of this view.
6813       */
6814      protected void onSizeChanged(int w, int h, int oldw, int oldh) {
6815      }
6816  
6817      /**
6818       * Called by draw to draw the child views. This may be overridden
6819       * by derived classes to gain control just before its children are drawn
6820       * (but after its own view has been drawn).
6821       * @param canvas the canvas on which to draw the view
6822       */
6823      protected void dispatchDraw(Canvas canvas) {
6824      }
6825  
6826      /**
6827       * Gets the parent of this view. Note that the parent is a
6828       * ViewParent and not necessarily a View.
6829       *
6830       * @return Parent of this view.
6831       */
6832      public final ViewParent getParent() {
6833          return mParent;
6834      }
6835  
6836      /**
6837       * Set the horizontal scrolled position of your view. This will cause a call to
6838       * {@link #onScrollChanged(int, int, int, int)} and the view will be
6839       * invalidated.
6840       * @param value the x position to scroll to
6841       */
6842      public void setScrollX(int value) {
6843          scrollTo(value, mScrollY);
6844      }
6845  
6846      /**
6847       * Set the vertical scrolled position of your view. This will cause a call to
6848       * {@link #onScrollChanged(int, int, int, int)} and the view will be
6849       * invalidated.
6850       * @param value the y position to scroll to
6851       */
6852      public void setScrollY(int value) {
6853          scrollTo(mScrollX, value);
6854      }
6855  
6856      /**
6857       * Return the scrolled left position of this view. This is the left edge of
6858       * the displayed part of your view. You do not need to draw any pixels
6859       * farther left, since those are outside of the frame of your view on
6860       * screen.
6861       *
6862       * @return The left edge of the displayed part of your view, in pixels.
6863       */
6864      public final int getScrollX() {
6865          return mScrollX;
6866      }
6867  
6868      /**
6869       * Return the scrolled top position of this view. This is the top edge of
6870       * the displayed part of your view. You do not need to draw any pixels above
6871       * it, since those are outside of the frame of your view on screen.
6872       *
6873       * @return The top edge of the displayed part of your view, in pixels.
6874       */
6875      public final int getScrollY() {
6876          return mScrollY;
6877      }
6878  
6879      /**
6880       * Return the width of the your view.
6881       *
6882       * @return The width of your view, in pixels.
6883       */
6884      @ViewDebug.ExportedProperty(category = "layout")
6885      public final int getWidth() {
6886          return mRight - mLeft;
6887      }
6888  
6889      /**
6890       * Return the height of your view.
6891       *
6892       * @return The height of your view, in pixels.
6893       */
6894      @ViewDebug.ExportedProperty(category = "layout")
6895      public final int getHeight() {
6896          return mBottom - mTop;
6897      }
6898  
6899      /**
6900       * Return the visible drawing bounds of your view. Fills in the output
6901       * rectangle with the values from getScrollX(), getScrollY(),
6902       * getWidth(), and getHeight().
6903       *
6904       * @param outRect The (scrolled) drawing bounds of the view.
6905       */
6906      public void getDrawingRect(Rect outRect) {
6907          outRect.left = mScrollX;
6908          outRect.top = mScrollY;
6909          outRect.right = mScrollX + (mRight - mLeft);
6910          outRect.bottom = mScrollY + (mBottom - mTop);
6911      }
6912  
6913      /**
6914       * Like {@link #getMeasuredWidthAndState()}, but only returns the
6915       * raw width component (that is the result is masked by
6916       * {@link #MEASURED_SIZE_MASK}).
6917       *
6918       * @return The raw measured width of this view.
6919       */
6920      public final int getMeasuredWidth() {
6921          return mMeasuredWidth & MEASURED_SIZE_MASK;
6922      }
6923  
6924      /**
6925       * Return the full width measurement information for this view as computed
6926       * by the most recent call to {@link #measure(int, int)}.  This result is a bit mask
6927       * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
6928       * This should be used during measurement and layout calculations only. Use
6929       * {@link #getWidth()} to see how wide a view is after layout.
6930       *
6931       * @return The measured width of this view as a bit mask.
6932       */
6933      public final int getMeasuredWidthAndState() {
6934          return mMeasuredWidth;
6935      }
6936  
6937      /**
6938       * Like {@link #getMeasuredHeightAndState()}, but only returns the
6939       * raw width component (that is the result is masked by
6940       * {@link #MEASURED_SIZE_MASK}).
6941       *
6942       * @return The raw measured height of this view.
6943       */
6944      public final int getMeasuredHeight() {
6945          return mMeasuredHeight & MEASURED_SIZE_MASK;
6946      }
6947  
6948      /**
6949       * Return the full height measurement information for this view as computed
6950       * by the most recent call to {@link #measure(int, int)}.  This result is a bit mask
6951       * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
6952       * This should be used during measurement and layout calculations only. Use
6953       * {@link #getHeight()} to see how wide a view is after layout.
6954       *
6955       * @return The measured width of this view as a bit mask.
6956       */
6957      public final int getMeasuredHeightAndState() {
6958          return mMeasuredHeight;
6959      }
6960  
6961      /**
6962       * Return only the state bits of {@link #getMeasuredWidthAndState()}
6963       * and {@link #getMeasuredHeightAndState()}, combined into one integer.
6964       * The width component is in the regular bits {@link #MEASURED_STATE_MASK}
6965       * and the height component is at the shifted bits
6966       * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}.
6967       */
6968      public final int getMeasuredState() {
6969          return (mMeasuredWidth&MEASURED_STATE_MASK)
6970                  | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT)
6971                          & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT));
6972      }
6973  
6974      /**
6975       * The transform matrix of this view, which is calculated based on the current
6976       * roation, scale, and pivot properties.
6977       *
6978       * @see #getRotation()
6979       * @see #getScaleX()
6980       * @see #getScaleY()
6981       * @see #getPivotX()
6982       * @see #getPivotY()
6983       * @return The current transform matrix for the view
6984       */
6985      public Matrix getMatrix() {
6986          if (mTransformationInfo != null) {
6987              updateMatrix();
6988              return mTransformationInfo.mMatrix;
6989          }
6990          return Matrix.IDENTITY_MATRIX;
6991      }
6992  
6993      /**
6994       * Utility function to determine if the value is far enough away from zero to be
6995       * considered non-zero.
6996       * @param value A floating point value to check for zero-ness
6997       * @return whether the passed-in value is far enough away from zero to be considered non-zero
6998       */
6999      private static boolean nonzero(float value) {
7000          return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON);
7001      }
7002  
7003      /**
7004       * Returns true if the transform matrix is the identity matrix.
7005       * Recomputes the matrix if necessary.
7006       *
7007       * @return True if the transform matrix is the identity matrix, false otherwise.
7008       */
7009      final boolean hasIdentityMatrix() {
7010          if (mTransformationInfo != null) {
7011              updateMatrix();
7012              return mTransformationInfo.mMatrixIsIdentity;
7013          }
7014          return true;
7015      }
7016  
7017      void ensureTransformationInfo() {
7018          if (mTransformationInfo == null) {
7019              mTransformationInfo = new TransformationInfo();
7020          }
7021      }
7022  
7023      /**
7024       * Recomputes the transform matrix if necessary.
7025       */
7026      private void updateMatrix() {
7027          final TransformationInfo info = mTransformationInfo;
7028          if (info == null) {
7029              return;
7030          }
7031          if (info.mMatrixDirty) {
7032              // transform-related properties have changed since the last time someone
7033              // asked for the matrix; recalculate it with the current values
7034  
7035              // Figure out if we need to update the pivot point
7036              if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) {
7037                  if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) {
7038                      info.mPrevWidth = mRight - mLeft;
7039                      info.mPrevHeight = mBottom - mTop;
7040                      info.mPivotX = info.mPrevWidth / 2f;
7041                      info.mPivotY = info.mPrevHeight / 2f;
7042                  }
7043              }
7044              info.mMatrix.reset();
7045              if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) {
7046                  info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY);
7047                  info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY);
7048                  info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY);
7049              } else {
7050                  if (info.mCamera == null) {
7051                      info.mCamera = new Camera();
7052                      info.matrix3D = new Matrix();
7053                  }
7054                  info.mCamera.save();
7055                  info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY);
7056                  info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation);
7057                  info.mCamera.getMatrix(info.matrix3D);
7058                  info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY);
7059                  info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX,
7060                          info.mPivotY + info.mTranslationY);
7061                  info.mMatrix.postConcat(info.matrix3D);
7062                  info.mCamera.restore();
7063              }
7064              info.mMatrixDirty = false;
7065              info.mMatrixIsIdentity = info.mMatrix.isIdentity();
7066              info.mInverseMatrixDirty = true;
7067          }
7068      }
7069  
7070      /**
7071       * Utility method to retrieve the inverse of the current mMatrix property.
7072       * We cache the matrix to avoid recalculating it when transform properties
7073       * have not changed.
7074       *
7075       * @return The inverse of the current matrix of this view.
7076       */
7077      final Matrix getInverseMatrix() {
7078          final TransformationInfo info = mTransformationInfo;
7079          if (info != null) {
7080              updateMatrix();
7081              if (info.mInverseMatrixDirty) {
7082                  if (info.mInverseMatrix == null) {
7083                      info.mInverseMatrix = new Matrix();
7084                  }
7085                  info.mMatrix.invert(info.mInverseMatrix);
7086                  info.mInverseMatrixDirty = false;
7087              }
7088              return info.mInverseMatrix;
7089          }
7090          return Matrix.IDENTITY_MATRIX;
7091      }
7092  
7093      /**
7094       * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which
7095       * views are drawn) from the camera to this view. The camera's distance
7096       * affects 3D transformations, for instance rotations around the X and Y
7097       * axis. If the rotationX or rotationY properties are changed and this view is
7098       * large (more than half the size of the screen), it is recommended to always
7099       * use a camera distance that's greater than the height (X axis rotation) or
7100       * the width (Y axis rotation) of this view.</p>
7101       *
7102       * <p>The distance of the camera from the view plane can have an affect on the
7103       * perspective distortion of the view when it is rotated around the x or y axis.
7104       * For example, a large distance will result in a large viewing angle, and there
7105       * will not be much perspective distortion of the view as it rotates. A short
7106       * distance may cause much more perspective distortion upon rotation, and can
7107       * also result in some drawing artifacts if the rotated view ends up partially
7108       * behind the camera (which is why the recommendation is to use a distance at
7109       * least as far as the size of the view, if the view is to be rotated.)</p>
7110       *
7111       * <p>The distance is expressed in "depth pixels." The default distance depends
7112       * on the screen density. For instance, on a medium density display, the
7113       * default distance is 1280. On a high density display, the default distance
7114       * is 1920.</p>
7115       *
7116       * <p>If you want to specify a distance that leads to visually consistent
7117       * results across various densities, use the following formula:</p>
7118       * <pre>
7119       * float scale = context.getResources().getDisplayMetrics().density;
7120       * view.setCameraDistance(distance * scale);
7121       * </pre>
7122       *
7123       * <p>The density scale factor of a high density display is 1.5,
7124       * and 1920 = 1280 * 1.5.</p>
7125       *
7126       * @param distance The distance in "depth pixels", if negative the opposite
7127       *        value is used
7128       *
7129       * @see #setRotationX(float)
7130       * @see #setRotationY(float)
7131       */
7132      public void setCameraDistance(float distance) {
7133          invalidateParentCaches();
7134          invalidate(false);
7135  
7136          ensureTransformationInfo();
7137          final float dpi = mResources.getDisplayMetrics().densityDpi;
7138          final TransformationInfo info = mTransformationInfo;
7139          if (info.mCamera == null) {
7140              info.mCamera = new Camera();
7141              info.matrix3D = new Matrix();
7142          }
7143  
7144          info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi);
7145          info.mMatrixDirty = true;
7146  
7147          invalidate(false);
7148      }
7149  
7150      /**
7151       * The degrees that the view is rotated around the pivot point.
7152       *
7153       * @see #setRotation(float)
7154       * @see #getPivotX()
7155       * @see #getPivotY()
7156       *
7157       * @return The degrees of rotation.
7158       */
7159      public float getRotation() {
7160          return mTransformationInfo != null ? mTransformationInfo.mRotation : 0;
7161      }
7162  
7163      /**
7164       * Sets the degrees that the view is rotated around the pivot point. Increasing values
7165       * result in clockwise rotation.
7166       *
7167       * @param rotation The degrees of rotation.
7168       *
7169       * @see #getRotation()
7170       * @see #getPivotX()
7171       * @see #getPivotY()
7172       * @see #setRotationX(float)
7173       * @see #setRotationY(float)
7174       *
7175       * @attr ref android.R.styleable#View_rotation
7176       */
7177      public void setRotation(float rotation) {
7178          ensureTransformationInfo();
7179          final TransformationInfo info = mTransformationInfo;
7180          if (info.mRotation != rotation) {
7181              invalidateParentCaches();
7182              // Double-invalidation is necessary to capture view's old and new areas
7183              invalidate(false);
7184              info.mRotation = rotation;
7185              info.mMatrixDirty = true;
7186              mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7187              invalidate(false);
7188          }
7189      }
7190  
7191      /**
7192       * The degrees that the view is rotated around the vertical axis through the pivot point.
7193       *
7194       * @see #getPivotX()
7195       * @see #getPivotY()
7196       * @see #setRotationY(float)
7197       *
7198       * @return The degrees of Y rotation.
7199       */
7200      public float getRotationY() {
7201          return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0;
7202      }
7203  
7204      /**
7205       * Sets the degrees that the view is rotated around the vertical axis through the pivot point.
7206       * Increasing values result in counter-clockwise rotation from the viewpoint of looking
7207       * down the y axis.
7208       *
7209       * When rotating large views, it is recommended to adjust the camera distance
7210       * accordingly. Refer to {@link #setCameraDistance(float)} for more information.
7211       *
7212       * @param rotationY The degrees of Y rotation.
7213       *
7214       * @see #getRotationY()
7215       * @see #getPivotX()
7216       * @see #getPivotY()
7217       * @see #setRotation(float)
7218       * @see #setRotationX(float)
7219       * @see #setCameraDistance(float)
7220       *
7221       * @attr ref android.R.styleable#View_rotationY
7222       */
7223      public void setRotationY(float rotationY) {
7224          ensureTransformationInfo();
7225          final TransformationInfo info = mTransformationInfo;
7226          if (info.mRotationY != rotationY) {
7227              invalidateParentCaches();
7228              // Double-invalidation is necessary to capture view's old and new areas
7229              invalidate(false);
7230              info.mRotationY = rotationY;
7231              info.mMatrixDirty = true;
7232              mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7233              invalidate(false);
7234          }
7235      }
7236  
7237      /**
7238       * The degrees that the view is rotated around the horizontal axis through the pivot point.
7239       *
7240       * @see #getPivotX()
7241       * @see #getPivotY()
7242       * @see #setRotationX(float)
7243       *
7244       * @return The degrees of X rotation.
7245       */
7246      public float getRotationX() {
7247          return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0;
7248      }
7249  
7250      /**
7251       * Sets the degrees that the view is rotated around the horizontal axis through the pivot point.
7252       * Increasing values result in clockwise rotation from the viewpoint of looking down the
7253       * x axis.
7254       *
7255       * When rotating large views, it is recommended to adjust the camera distance
7256       * accordingly. Refer to {@link #setCameraDistance(float)} for more information.
7257       *
7258       * @param rotationX The degrees of X rotation.
7259       *
7260       * @see #getRotationX()
7261       * @see #getPivotX()
7262       * @see #getPivotY()
7263       * @see #setRotation(float)
7264       * @see #setRotationY(float)
7265       * @see #setCameraDistance(float)
7266       *
7267       * @attr ref android.R.styleable#View_rotationX
7268       */
7269      public void setRotationX(float rotationX) {
7270          ensureTransformationInfo();
7271          final TransformationInfo info = mTransformationInfo;
7272          if (info.mRotationX != rotationX) {
7273              invalidateParentCaches();
7274              // Double-invalidation is necessary to capture view's old and new areas
7275              invalidate(false);
7276              info.mRotationX = rotationX;
7277              info.mMatrixDirty = true;
7278              mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7279              invalidate(false);
7280          }
7281      }
7282  
7283      /**
7284       * The amount that the view is scaled in x around the pivot point, as a proportion of
7285       * the view's unscaled width. A value of 1, the default, means that no scaling is applied.
7286       *
7287       * <p>By default, this is 1.0f.
7288       *
7289       * @see #getPivotX()
7290       * @see #getPivotY()
7291       * @return The scaling factor.
7292       */
7293      public float getScaleX() {
7294          return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1;
7295      }
7296  
7297      /**
7298       * Sets the amount that the view is scaled in x around the pivot point, as a proportion of
7299       * the view's unscaled width. A value of 1 means that no scaling is applied.
7300       *
7301       * @param scaleX The scaling factor.
7302       * @see #getPivotX()
7303       * @see #getPivotY()
7304       *
7305       * @attr ref android.R.styleable#View_scaleX
7306       */
7307      public void setScaleX(float scaleX) {
7308          ensureTransformationInfo();
7309          final TransformationInfo info = mTransformationInfo;
7310          if (info.mScaleX != scaleX) {
7311              invalidateParentCaches();
7312              // Double-invalidation is necessary to capture view's old and new areas
7313              invalidate(false);
7314              info.mScaleX = scaleX;
7315              info.mMatrixDirty = true;
7316              mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7317              invalidate(false);
7318          }
7319      }
7320  
7321      /**
7322       * The amount that the view is scaled in y around the pivot point, as a proportion of
7323       * the view's unscaled height. A value of 1, the default, means that no scaling is applied.
7324       *
7325       * <p>By default, this is 1.0f.
7326       *
7327       * @see #getPivotX()
7328       * @see #getPivotY()
7329       * @return The scaling factor.
7330       */
7331      public float getScaleY() {
7332          return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1;
7333      }
7334  
7335      /**
7336       * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of
7337       * the view's unscaled width. A value of 1 means that no scaling is applied.
7338       *
7339       * @param scaleY The scaling factor.
7340       * @see #getPivotX()
7341       * @see #getPivotY()
7342       *
7343       * @attr ref android.R.styleable#View_scaleY
7344       */
7345      public void setScaleY(float scaleY) {
7346          ensureTransformationInfo();
7347          final TransformationInfo info = mTransformationInfo;
7348          if (info.mScaleY != scaleY) {
7349              invalidateParentCaches();
7350              // Double-invalidation is necessary to capture view's old and new areas
7351              invalidate(false);
7352              info.mScaleY = scaleY;
7353              info.mMatrixDirty = true;
7354              mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7355              invalidate(false);
7356          }
7357      }
7358  
7359      /**
7360       * The x location of the point around which the view is {@link #setRotation(float) rotated}
7361       * and {@link #setScaleX(float) scaled}.
7362       *
7363       * @see #getRotation()
7364       * @see #getScaleX()
7365       * @see #getScaleY()
7366       * @see #getPivotY()
7367       * @return The x location of the pivot point.
7368       */
7369      public float getPivotX() {
7370          return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0;
7371      }
7372  
7373      /**
7374       * Sets the x location of the point around which the view is
7375       * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}.
7376       * By default, the pivot point is centered on the object.
7377       * Setting this property disables this behavior and causes the view to use only the
7378       * explicitly set pivotX and pivotY values.
7379       *
7380       * @param pivotX The x location of the pivot point.
7381       * @see #getRotation()
7382       * @see #getScaleX()
7383       * @see #getScaleY()
7384       * @see #getPivotY()
7385       *
7386       * @attr ref android.R.styleable#View_transformPivotX
7387       */
7388      public void setPivotX(float pivotX) {
7389          ensureTransformationInfo();
7390          mPrivateFlags |= PIVOT_EXPLICITLY_SET;
7391          final TransformationInfo info = mTransformationInfo;
7392          if (info.mPivotX != pivotX) {
7393              invalidateParentCaches();
7394              // Double-invalidation is necessary to capture view's old and new areas
7395              invalidate(false);
7396              info.mPivotX = pivotX;
7397              info.mMatrixDirty = true;
7398              mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7399              invalidate(false);
7400          }
7401      }
7402  
7403      /**
7404       * The y location of the point around which the view is {@link #setRotation(float) rotated}
7405       * and {@link #setScaleY(float) scaled}.
7406       *
7407       * @see #getRotation()
7408       * @see #getScaleX()
7409       * @see #getScaleY()
7410       * @see #getPivotY()
7411       * @return The y location of the pivot point.
7412       */
7413      public float getPivotY() {
7414          return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0;
7415      }
7416  
7417      /**
7418       * Sets the y location of the point around which the view is {@link #setRotation(float) rotated}
7419       * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object.
7420       * Setting this property disables this behavior and causes the view to use only the
7421       * explicitly set pivotX and pivotY values.
7422       *
7423       * @param pivotY The y location of the pivot point.
7424       * @see #getRotation()
7425       * @see #getScaleX()
7426       * @see #getScaleY()
7427       * @see #getPivotY()
7428       *
7429       * @attr ref android.R.styleable#View_transformPivotY
7430       */
7431      public void setPivotY(float pivotY) {
7432          ensureTransformationInfo();
7433          mPrivateFlags |= PIVOT_EXPLICITLY_SET;
7434          final TransformationInfo info = mTransformationInfo;
7435          if (info.mPivotY != pivotY) {
7436              invalidateParentCaches();
7437              // Double-invalidation is necessary to capture view's old and new areas
7438              invalidate(false);
7439              info.mPivotY = pivotY;
7440              info.mMatrixDirty = true;
7441              mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7442              invalidate(false);
7443          }
7444      }
7445  
7446      /**
7447       * The opacity of the view. This is a value from 0 to 1, where 0 means the view is
7448       * completely transparent and 1 means the view is completely opaque.
7449       *
7450       * <p>By default this is 1.0f.
7451       * @return The opacity of the view.
7452       */
7453      public float getAlpha() {
7454          return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1;
7455      }
7456  
7457      /**
7458       * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is
7459       * completely transparent and 1 means the view is completely opaque.</p>
7460       *
7461       * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is
7462       * responsible for applying the opacity itself. Otherwise, calling this method is
7463       * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and
7464       * setting a hardware layer.</p>
7465       *
7466       * @param alpha The opacity of the view.
7467       *
7468       * @see #setLayerType(int, android.graphics.Paint)
7469       *
7470       * @attr ref android.R.styleable#View_alpha
7471       */
7472      public void setAlpha(float alpha) {
7473          ensureTransformationInfo();
7474          mTransformationInfo.mAlpha = alpha;
7475          invalidateParentCaches();
7476          if (onSetAlpha((int) (alpha * 255))) {
7477              mPrivateFlags |= ALPHA_SET;
7478              // subclass is handling alpha - don't optimize rendering cache invalidation
7479              invalidate(true);
7480          } else {
7481              mPrivateFlags &= ~ALPHA_SET;
7482              invalidate(false);
7483          }
7484      }
7485  
7486      /**
7487       * Faster version of setAlpha() which performs the same steps except there are
7488       * no calls to invalidate(). The caller of this function should perform proper invalidation
7489       * on the parent and this object. The return value indicates whether the subclass handles
7490       * alpha (the return value for onSetAlpha()).
7491       *
7492       * @param alpha The new value for the alpha property
7493       * @return true if the View subclass handles alpha (the return value for onSetAlpha())
7494       */
7495      boolean setAlphaNoInvalidation(float alpha) {
7496          ensureTransformationInfo();
7497          mTransformationInfo.mAlpha = alpha;
7498          boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255));
7499          if (subclassHandlesAlpha) {
7500              mPrivateFlags |= ALPHA_SET;
7501          } else {
7502              mPrivateFlags &= ~ALPHA_SET;
7503          }
7504          return subclassHandlesAlpha;
7505      }
7506  
7507      /**
7508       * Top position of this view relative to its parent.
7509       *
7510       * @return The top of this view, in pixels.
7511       */
7512      @ViewDebug.CapturedViewProperty
7513      public final int getTop() {
7514          return mTop;
7515      }
7516  
7517      /**
7518       * Sets the top position of this view relative to its parent. This method is meant to be called
7519       * by the layout system and should not generally be called otherwise, because the property
7520       * may be changed at any time by the layout.
7521       *
7522       * @param top The top of this view, in pixels.
7523       */
7524      public final void setTop(int top) {
7525          if (top != mTop) {
7526              updateMatrix();
7527              final boolean matrixIsIdentity = mTransformationInfo == null
7528                      || mTransformationInfo.mMatrixIsIdentity;
7529              if (matrixIsIdentity) {
7530                  if (mAttachInfo != null) {
7531                      int minTop;
7532                      int yLoc;
7533                      if (top < mTop) {
7534                          minTop = top;
7535                          yLoc = top - mTop;
7536                      } else {
7537                          minTop = mTop;
7538                          yLoc = 0;
7539                      }
7540                      invalidate(0, yLoc, mRight - mLeft, mBottom - minTop);
7541                  }
7542              } else {
7543                  // Double-invalidation is necessary to capture view's old and new areas
7544                  invalidate(true);
7545              }
7546  
7547              int width = mRight - mLeft;
7548              int oldHeight = mBottom - mTop;
7549  
7550              mTop = top;
7551  
7552              onSizeChanged(width, mBottom - mTop, width, oldHeight);
7553  
7554              if (!matrixIsIdentity) {
7555                  if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) {
7556                      // A change in dimension means an auto-centered pivot point changes, too
7557                      mTransformationInfo.mMatrixDirty = true;
7558                  }
7559                  mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7560                  invalidate(true);
7561              }
7562              mBackgroundSizeChanged = true;
7563              invalidateParentIfNeeded();
7564          }
7565      }
7566  
7567      /**
7568       * Bottom position of this view relative to its parent.
7569       *
7570       * @return The bottom of this view, in pixels.
7571       */
7572      @ViewDebug.CapturedViewProperty
7573      public final int getBottom() {
7574          return mBottom;
7575      }
7576  
7577      /**
7578       * True if this view has changed since the last time being drawn.
7579       *
7580       * @return The dirty state of this view.
7581       */
7582      public boolean isDirty() {
7583          return (mPrivateFlags & DIRTY_MASK) != 0;
7584      }
7585  
7586      /**
7587       * Sets the bottom position of this view relative to its parent. This method is meant to be
7588       * called by the layout system and should not generally be called otherwise, because the
7589       * property may be changed at any time by the layout.
7590       *
7591       * @param bottom The bottom of this view, in pixels.
7592       */
7593      public final void setBottom(int bottom) {
7594          if (bottom != mBottom) {
7595              updateMatrix();
7596              final boolean matrixIsIdentity = mTransformationInfo == null
7597                      || mTransformationInfo.mMatrixIsIdentity;
7598              if (matrixIsIdentity) {
7599                  if (mAttachInfo != null) {
7600                      int maxBottom;
7601                      if (bottom < mBottom) {
7602                          maxBottom = mBottom;
7603                      } else {
7604                          maxBottom = bottom;
7605                      }
7606                      invalidate(0, 0, mRight - mLeft, maxBottom - mTop);
7607                  }
7608              } else {
7609                  // Double-invalidation is necessary to capture view's old and new areas
7610                  invalidate(true);
7611              }
7612  
7613              int width = mRight - mLeft;
7614              int oldHeight = mBottom - mTop;
7615  
7616              mBottom = bottom;
7617  
7618              onSizeChanged(width, mBottom - mTop, width, oldHeight);
7619  
7620              if (!matrixIsIdentity) {
7621                  if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) {
7622                      // A change in dimension means an auto-centered pivot point changes, too
7623                      mTransformationInfo.mMatrixDirty = true;
7624                  }
7625                  mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7626                  invalidate(true);
7627              }
7628              mBackgroundSizeChanged = true;
7629              invalidateParentIfNeeded();
7630          }
7631      }
7632  
7633      /**
7634       * Left position of this view relative to its parent.
7635       *
7636       * @return The left edge of this view, in pixels.
7637       */
7638      @ViewDebug.CapturedViewProperty
7639      public final int getLeft() {
7640          return mLeft;
7641      }
7642  
7643      /**
7644       * Sets the left position of this view relative to its parent. This method is meant to be called
7645       * by the layout system and should not generally be called otherwise, because the property
7646       * may be changed at any time by the layout.
7647       *
7648       * @param left The bottom of this view, in pixels.
7649       */
7650      public final void setLeft(int left) {
7651          if (left != mLeft) {
7652              updateMatrix();
7653              final boolean matrixIsIdentity = mTransformationInfo == null
7654                      || mTransformationInfo.mMatrixIsIdentity;
7655              if (matrixIsIdentity) {
7656                  if (mAttachInfo != null) {
7657                      int minLeft;
7658                      int xLoc;
7659                      if (left < mLeft) {
7660                          minLeft = left;
7661                          xLoc = left - mLeft;
7662                      } else {
7663                          minLeft = mLeft;
7664                          xLoc = 0;
7665                      }
7666                      invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop);
7667                  }
7668              } else {
7669                  // Double-invalidation is necessary to capture view's old and new areas
7670                  invalidate(true);
7671              }
7672  
7673              int oldWidth = mRight - mLeft;
7674              int height = mBottom - mTop;
7675  
7676              mLeft = left;
7677  
7678              onSizeChanged(mRight - mLeft, height, oldWidth, height);
7679  
7680              if (!matrixIsIdentity) {
7681                  if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) {
7682                      // A change in dimension means an auto-centered pivot point changes, too
7683                      mTransformationInfo.mMatrixDirty = true;
7684                  }
7685                  mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7686                  invalidate(true);
7687              }
7688              mBackgroundSizeChanged = true;
7689              invalidateParentIfNeeded();
7690          }
7691      }
7692  
7693      /**
7694       * Right position of this view relative to its parent.
7695       *
7696       * @return The right edge of this view, in pixels.
7697       */
7698      @ViewDebug.CapturedViewProperty
7699      public final int getRight() {
7700          return mRight;
7701      }
7702  
7703      /**
7704       * Sets the right position of this view relative to its parent. This method is meant to be called
7705       * by the layout system and should not generally be called otherwise, because the property
7706       * may be changed at any time by the layout.
7707       *
7708       * @param right The bottom of this view, in pixels.
7709       */
7710      public final void setRight(int right) {
7711          if (right != mRight) {
7712              updateMatrix();
7713              final boolean matrixIsIdentity = mTransformationInfo == null
7714                      || mTransformationInfo.mMatrixIsIdentity;
7715              if (matrixIsIdentity) {
7716                  if (mAttachInfo != null) {
7717                      int maxRight;
7718                      if (right < mRight) {
7719                          maxRight = mRight;
7720                      } else {
7721                          maxRight = right;
7722                      }
7723                      invalidate(0, 0, maxRight - mLeft, mBottom - mTop);
7724                  }
7725              } else {
7726                  // Double-invalidation is necessary to capture view's old and new areas
7727                  invalidate(true);
7728              }
7729  
7730              int oldWidth = mRight - mLeft;
7731              int height = mBottom - mTop;
7732  
7733              mRight = right;
7734  
7735              onSizeChanged(mRight - mLeft, height, oldWidth, height);
7736  
7737              if (!matrixIsIdentity) {
7738                  if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) {
7739                      // A change in dimension means an auto-centered pivot point changes, too
7740                      mTransformationInfo.mMatrixDirty = true;
7741                  }
7742                  mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7743                  invalidate(true);
7744              }
7745              mBackgroundSizeChanged = true;
7746              invalidateParentIfNeeded();
7747          }
7748      }
7749  
7750      /**
7751       * The visual x position of this view, in pixels. This is equivalent to the
7752       * {@link #setTranslationX(float) translationX} property plus the current
7753       * {@link #getLeft() left} property.
7754       *
7755       * @return The visual x position of this view, in pixels.
7756       */
7757      public float getX() {
7758          return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0);
7759      }
7760  
7761      /**
7762       * Sets the visual x position of this view, in pixels. This is equivalent to setting the
7763       * {@link #setTranslationX(float) translationX} property to be the difference between
7764       * the x value passed in and the current {@link #getLeft() left} property.
7765       *
7766       * @param x The visual x position of this view, in pixels.
7767       */
7768      public void setX(float x) {
7769          setTranslationX(x - mLeft);
7770      }
7771  
7772      /**
7773       * The visual y position of this view, in pixels. This is equivalent to the
7774       * {@link #setTranslationY(float) translationY} property plus the current
7775       * {@link #getTop() top} property.
7776       *
7777       * @return The visual y position of this view, in pixels.
7778       */
7779      public float getY() {
7780          return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0);
7781      }
7782  
7783      /**
7784       * Sets the visual y position of this view, in pixels. This is equivalent to setting the
7785       * {@link #setTranslationY(float) translationY} property to be the difference between
7786       * the y value passed in and the current {@link #getTop() top} property.
7787       *
7788       * @param y The visual y position of this view, in pixels.
7789       */
7790      public void setY(float y) {
7791          setTranslationY(y - mTop);
7792      }
7793  
7794  
7795      /**
7796       * The horizontal location of this view relative to its {@link #getLeft() left} position.
7797       * This position is post-layout, in addition to wherever the object's
7798       * layout placed it.
7799       *
7800       * @return The horizontal position of this view relative to its left position, in pixels.
7801       */
7802      public float getTranslationX() {
7803          return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0;
7804      }
7805  
7806      /**
7807       * Sets the horizontal location of this view relative to its {@link #getLeft() left} position.
7808       * This effectively positions the object post-layout, in addition to wherever the object's
7809       * layout placed it.
7810       *
7811       * @param translationX The horizontal position of this view relative to its left position,
7812       * in pixels.
7813       *
7814       * @attr ref android.R.styleable#View_translationX
7815       */
7816      public void setTranslationX(float translationX) {
7817          ensureTransformationInfo();
7818          final TransformationInfo info = mTransformationInfo;
7819          if (info.mTranslationX != translationX) {
7820              invalidateParentCaches();
7821              // Double-invalidation is necessary to capture view's old and new areas
7822              invalidate(false);
7823              info.mTranslationX = translationX;
7824              info.mMatrixDirty = true;
7825              mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7826              invalidate(false);
7827          }
7828      }
7829  
7830      /**
7831       * The horizontal location of this view relative to its {@link #getTop() top} position.
7832       * This position is post-layout, in addition to wherever the object's
7833       * layout placed it.
7834       *
7835       * @return The vertical position of this view relative to its top position,
7836       * in pixels.
7837       */
7838      public float getTranslationY() {
7839          return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0;
7840      }
7841  
7842      /**
7843       * Sets the vertical location of this view relative to its {@link #getTop() top} position.
7844       * This effectively positions the object post-layout, in addition to wherever the object's
7845       * layout placed it.
7846       *
7847       * @param translationY The vertical position of this view relative to its top position,
7848       * in pixels.
7849       *
7850       * @attr ref android.R.styleable#View_translationY
7851       */
7852      public void setTranslationY(float translationY) {
7853          ensureTransformationInfo();
7854          final TransformationInfo info = mTransformationInfo;
7855          if (info.mTranslationY != translationY) {
7856              invalidateParentCaches();
7857              // Double-invalidation is necessary to capture view's old and new areas
7858              invalidate(false);
7859              info.mTranslationY = translationY;
7860              info.mMatrixDirty = true;
7861              mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
7862              invalidate(false);
7863          }
7864      }
7865  
7866      /**
7867       * @hide
7868       */
7869      public void setFastTranslationX(float x) {
7870          ensureTransformationInfo();
7871          final TransformationInfo info = mTransformationInfo;
7872          info.mTranslationX = x;
7873          info.mMatrixDirty = true;
7874      }
7875  
7876      /**
7877       * @hide
7878       */
7879      public void setFastTranslationY(float y) {
7880          ensureTransformationInfo();
7881          final TransformationInfo info = mTransformationInfo;
7882          info.mTranslationY = y;
7883          info.mMatrixDirty = true;
7884      }
7885  
7886      /**
7887       * @hide
7888       */
7889      public void setFastX(float x) {
7890          ensureTransformationInfo();
7891          final TransformationInfo info = mTransformationInfo;
7892          info.mTranslationX = x - mLeft;
7893          info.mMatrixDirty = true;
7894      }
7895  
7896      /**
7897       * @hide
7898       */
7899      public void setFastY(float y) {
7900          ensureTransformationInfo();
7901          final TransformationInfo info = mTransformationInfo;
7902          info.mTranslationY = y - mTop;
7903          info.mMatrixDirty = true;
7904      }
7905  
7906      /**
7907       * @hide
7908       */
7909      public void setFastScaleX(float x) {
7910          ensureTransformationInfo();
7911          final TransformationInfo info = mTransformationInfo;
7912          info.mScaleX = x;
7913          info.mMatrixDirty = true;
7914      }
7915  
7916      /**
7917       * @hide
7918       */
7919      public void setFastScaleY(float y) {
7920          ensureTransformationInfo();
7921          final TransformationInfo info = mTransformationInfo;
7922          info.mScaleY = y;
7923          info.mMatrixDirty = true;
7924      }
7925  
7926      /**
7927       * @hide
7928       */
7929      public void setFastAlpha(float alpha) {
7930          ensureTransformationInfo();
7931          mTransformationInfo.mAlpha = alpha;
7932      }
7933  
7934      /**
7935       * @hide
7936       */
7937      public void setFastRotationY(float y) {
7938          ensureTransformationInfo();
7939          final TransformationInfo info = mTransformationInfo;
7940          info.mRotationY = y;
7941          info.mMatrixDirty = true;
7942      }
7943  
7944      /**
7945       * Hit rectangle in parent's coordinates
7946       *
7947       * @param outRect The hit rectangle of the view.
7948       */
7949      public void getHitRect(Rect outRect) {
7950          updateMatrix();
7951          final TransformationInfo info = mTransformationInfo;
7952          if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) {
7953              outRect.set(mLeft, mTop, mRight, mBottom);
7954          } else {
7955              final RectF tmpRect = mAttachInfo.mTmpTransformRect;
7956              tmpRect.set(-info.mPivotX, -info.mPivotY,
7957                      getWidth() - info.mPivotX, getHeight() - info.mPivotY);
7958              info.mMatrix.mapRect(tmpRect);
7959              outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop,
7960                      (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop);
7961          }
7962      }
7963  
7964      /**
7965       * Determines whether the given point, in local coordinates is inside the view.
7966       */
7967      /*package*/ final boolean pointInView(float localX, float localY) {
7968          return localX >= 0 && localX < (mRight - mLeft)
7969                  && localY >= 0 && localY < (mBottom - mTop);
7970      }
7971  
7972      /**
7973       * Utility method to determine whether the given point, in local coordinates,
7974       * is inside the view, where the area of the view is expanded by the slop factor.
7975       * This method is called while processing touch-move events to determine if the event
7976       * is still within the view.
7977       */
7978      private boolean pointInView(float localX, float localY, float slop) {
7979          return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) &&
7980                  localY < ((mBottom - mTop) + slop);
7981      }
7982  
7983      /**
7984       * When a view has focus and the user navigates away from it, the next view is searched for
7985       * starting from the rectangle filled in by this method.
7986       *
7987       * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)})
7988       * of the view.  However, if your view maintains some idea of internal selection,
7989       * such as a cursor, or a selected row or column, you should override this method and
7990       * fill in a more specific rectangle.
7991       *
7992       * @param r The rectangle to fill in, in this view's coordinates.
7993       */
7994      public void getFocusedRect(Rect r) {
7995          getDrawingRect(r);
7996      }
7997  
7998      /**
7999       * If some part of this view is not clipped by any of its parents, then
8000       * return that area in r in global (root) coordinates. To convert r to local
8001       * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x,
8002       * -globalOffset.y)) If the view is completely clipped or translated out,
8003       * return false.
8004       *
8005       * @param r If true is returned, r holds the global coordinates of the
8006       *        visible portion of this view.
8007       * @param globalOffset If true is returned, globalOffset holds the dx,dy
8008       *        between this view and its root. globalOffet may be null.
8009       * @return true if r is non-empty (i.e. part of the view is visible at the
8010       *         root level.
8011       */
8012      public boolean getGlobalVisibleRect(Rect r, Point globalOffset) {
8013          int width = mRight - mLeft;
8014          int height = mBottom - mTop;
8015          if (width > 0 && height > 0) {
8016              r.set(0, 0, width, height);
8017              if (globalOffset != null) {
8018                  globalOffset.set(-mScrollX, -mScrollY);
8019              }
8020              return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset);
8021          }
8022          return false;
8023      }
8024  
8025      public final boolean getGlobalVisibleRect(Rect r) {
8026          return getGlobalVisibleRect(r, null);
8027      }
8028  
8029      public final boolean getLocalVisibleRect(Rect r) {
8030          Point offset = new Point();
8031          if (getGlobalVisibleRect(r, offset)) {
8032              r.offset(-offset.x, -offset.y); // make r local
8033              return true;
8034          }
8035          return false;
8036      }
8037  
8038      /**
8039       * Offset this view's vertical location by the specified number of pixels.
8040       *
8041       * @param offset the number of pixels to offset the view by
8042       */
8043      public void offsetTopAndBottom(int offset) {
8044          if (offset != 0) {
8045              updateMatrix();
8046              final boolean matrixIsIdentity = mTransformationInfo == null
8047                      || mTransformationInfo.mMatrixIsIdentity;
8048              if (matrixIsIdentity) {
8049                  final ViewParent p = mParent;
8050                  if (p != null && mAttachInfo != null) {
8051                      final Rect r = mAttachInfo.mTmpInvalRect;
8052                      int minTop;
8053                      int maxBottom;
8054                      int yLoc;
8055                      if (offset < 0) {
8056                          minTop = mTop + offset;
8057                          maxBottom = mBottom;
8058                          yLoc = offset;
8059                      } else {
8060                          minTop = mTop;
8061                          maxBottom = mBottom + offset;
8062                          yLoc = 0;
8063                      }
8064                      r.set(0, yLoc, mRight - mLeft, maxBottom - minTop);
8065                      p.invalidateChild(this, r);
8066                  }
8067              } else {
8068                  invalidate(false);
8069              }
8070  
8071              mTop += offset;
8072              mBottom += offset;
8073  
8074              if (!matrixIsIdentity) {
8075                  mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
8076                  invalidate(false);
8077              }
8078              invalidateParentIfNeeded();
8079          }
8080      }
8081  
8082      /**
8083       * Offset this view's horizontal location by the specified amount of pixels.
8084       *
8085       * @param offset the numer of pixels to offset the view by
8086       */
8087      public void offsetLeftAndRight(int offset) {
8088          if (offset != 0) {
8089              updateMatrix();
8090              final boolean matrixIsIdentity = mTransformationInfo == null
8091                      || mTransformationInfo.mMatrixIsIdentity;
8092              if (matrixIsIdentity) {
8093                  final ViewParent p = mParent;
8094                  if (p != null && mAttachInfo != null) {
8095                      final Rect r = mAttachInfo.mTmpInvalRect;
8096                      int minLeft;
8097                      int maxRight;
8098                      if (offset < 0) {
8099                          minLeft = mLeft + offset;
8100                          maxRight = mRight;
8101                      } else {
8102                          minLeft = mLeft;
8103                          maxRight = mRight + offset;
8104                      }
8105                      r.set(0, 0, maxRight - minLeft, mBottom - mTop);
8106                      p.invalidateChild(this, r);
8107                  }
8108              } else {
8109                  invalidate(false);
8110              }
8111  
8112              mLeft += offset;
8113              mRight += offset;
8114  
8115              if (!matrixIsIdentity) {
8116                  mPrivateFlags |= DRAWN; // force another invalidation with the new orientation
8117                  invalidate(false);
8118              }
8119              invalidateParentIfNeeded();
8120          }
8121      }
8122  
8123      /**
8124       * Get the LayoutParams associated with this view. All views should have
8125       * layout parameters. These supply parameters to the <i>parent</i> of this
8126       * view specifying how it should be arranged. There are many subclasses of
8127       * ViewGroup.LayoutParams, and these correspond to the different subclasses
8128       * of ViewGroup that are responsible for arranging their children.
8129       *
8130       * This method may return null if this View is not attached to a parent
8131       * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)}
8132       * was not invoked successfully. When a View is attached to a parent
8133       * ViewGroup, this method must not return null.
8134       *
8135       * @return The LayoutParams associated with this view, or null if no
8136       *         parameters have been set yet
8137       */
8138      @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_")
8139      public ViewGroup.LayoutParams getLayoutParams() {
8140          return mLayoutParams;
8141      }
8142  
8143      /**
8144       * Set the layout parameters associated with this view. These supply
8145       * parameters to the <i>parent</i> of this view specifying how it should be
8146       * arranged. There are many subclasses of ViewGroup.LayoutParams, and these
8147       * correspond to the different subclasses of ViewGroup that are responsible
8148       * for arranging their children.
8149       *
8150       * @param params The layout parameters for this view, cannot be null
8151       */
8152      public void setLayoutParams(ViewGroup.LayoutParams params) {
8153          if (params == null) {
8154              throw new NullPointerException("Layout parameters cannot be null");
8155          }
8156          mLayoutParams = params;
8157          requestLayout();
8158      }
8159  
8160      /**
8161       * Set the scrolled position of your view. This will cause a call to
8162       * {@link #onScrollChanged(int, int, int, int)} and the view will be
8163       * invalidated.
8164       * @param x the x position to scroll to
8165       * @param y the y position to scroll to
8166       */
8167      public void scrollTo(int x, int y) {
8168          if (mScrollX != x || mScrollY != y) {
8169              int oldX = mScrollX;
8170              int oldY = mScrollY;
8171              mScrollX = x;
8172              mScrollY = y;
8173              invalidateParentCaches();
8174              onScrollChanged(mScrollX, mScrollY, oldX, oldY);
8175              if (!awakenScrollBars()) {
8176                  invalidate(true);
8177              }
8178          }
8179      }
8180  
8181      /**
8182       * Move the scrolled position of your view. This will cause a call to
8183       * {@link #onScrollChanged(int, int, int, int)} and the view will be
8184       * invalidated.
8185       * @param x the amount of pixels to scroll by horizontally
8186       * @param y the amount of pixels to scroll by vertically
8187       */
8188      public void scrollBy(int x, int y) {
8189          scrollTo(mScrollX + x, mScrollY + y);
8190      }
8191  
8192      /**
8193       * <p>Trigger the scrollbars to draw. When invoked this method starts an
8194       * animation to fade the scrollbars out after a default delay. If a subclass
8195       * provides animated scrolling, the start delay should equal the duration
8196       * of the scrolling animation.</p>
8197       *
8198       * <p>The animation starts only if at least one of the scrollbars is
8199       * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and
8200       * {@link #isVerticalScrollBarEnabled()}. When the animation is started,
8201       * this method returns true, and false otherwise. If the animation is
8202       * started, this method calls {@link #invalidate()}; in that case the
8203       * caller should not call {@link #invalidate()}.</p>
8204       *
8205       * <p>This method should be invoked every time a subclass directly updates
8206       * the scroll parameters.</p>
8207       *
8208       * <p>This method is automatically invoked by {@link #scrollBy(int, int)}
8209       * and {@link #scrollTo(int, int)}.</p>
8210       *
8211       * @return true if the animation is played, false otherwise
8212       *
8213       * @see #awakenScrollBars(int)
8214       * @see #scrollBy(int, int)
8215       * @see #scrollTo(int, int)
8216       * @see #isHorizontalScrollBarEnabled()
8217       * @see #isVerticalScrollBarEnabled()
8218       * @see #setHorizontalScrollBarEnabled(boolean)
8219       * @see #setVerticalScrollBarEnabled(boolean)
8220       */
8221      protected boolean awakenScrollBars() {
8222          return mScrollCache != null &&
8223                  awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true);
8224      }
8225  
8226      /**
8227       * Trigger the scrollbars to draw.
8228       * This method differs from awakenScrollBars() only in its default duration.
8229       * initialAwakenScrollBars() will show the scroll bars for longer than
8230       * usual to give the user more of a chance to notice them.
8231       *
8232       * @return true if the animation is played, false otherwise.
8233       */
8234      private boolean initialAwakenScrollBars() {
8235          return mScrollCache != null &&
8236                  awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true);
8237      }
8238  
8239      /**
8240       * <p>
8241       * Trigger the scrollbars to draw. When invoked this method starts an
8242       * animation to fade the scrollbars out after a fixed delay. If a subclass
8243       * provides animated scrolling, the start delay should equal the duration of
8244       * the scrolling animation.
8245       * </p>
8246       *
8247       * <p>
8248       * The animation starts only if at least one of the scrollbars is enabled,
8249       * as specified by {@link #isHorizontalScrollBarEnabled()} and
8250       * {@link #isVerticalScrollBarEnabled()}. When the animation is started,
8251       * this method returns true, and false otherwise. If the animation is
8252       * started, this method calls {@link #invalidate()}; in that case the caller
8253       * should not call {@link #invalidate()}.
8254       * </p>
8255       *
8256       * <p>
8257       * This method should be invoked everytime a subclass directly updates the
8258       * scroll parameters.
8259       * </p>
8260       *
8261       * @param startDelay the delay, in milliseconds, after which the animation
8262       *        should start; when the delay is 0, the animation starts
8263       *        immediately
8264       * @return true if the animation is played, false otherwise
8265       *
8266       * @see #scrollBy(int, int)
8267       * @see #scrollTo(int, int)
8268       * @see #isHorizontalScrollBarEnabled()
8269       * @see #isVerticalScrollBarEnabled()
8270       * @see #setHorizontalScrollBarEnabled(boolean)
8271       * @see #setVerticalScrollBarEnabled(boolean)
8272       */
8273      protected boolean awakenScrollBars(int startDelay) {
8274          return awakenScrollBars(startDelay, true);
8275      }
8276  
8277      /**
8278       * <p>
8279       * Trigger the scrollbars to draw. When invoked this method starts an
8280       * animation to fade the scrollbars out after a fixed delay. If a subclass
8281       * provides animated scrolling, the start delay should equal the duration of
8282       * the scrolling animation.
8283       * </p>
8284       *
8285       * <p>
8286       * The animation starts only if at least one of the scrollbars is enabled,
8287       * as specified by {@link #isHorizontalScrollBarEnabled()} and
8288       * {@link #isVerticalScrollBarEnabled()}. When the animation is started,
8289       * this method returns true, and false otherwise. If the animation is
8290       * started, this method calls {@link #invalidate()} if the invalidate parameter
8291       * is set to true; in that case the caller
8292       * should not call {@link #invalidate()}.
8293       * </p>
8294       *
8295       * <p>
8296       * This method should be invoked everytime a subclass directly updates the
8297       * scroll parameters.
8298       * </p>
8299       *
8300       * @param startDelay the delay, in milliseconds, after which the animation
8301       *        should start; when the delay is 0, the animation starts
8302       *        immediately
8303       *
8304       * @param invalidate Wheter this method should call invalidate
8305       *
8306       * @return true if the animation is played, false otherwise
8307       *
8308       * @see #scrollBy(int, int)
8309       * @see #scrollTo(int, int)
8310       * @see #isHorizontalScrollBarEnabled()
8311       * @see #isVerticalScrollBarEnabled()
8312       * @see #setHorizontalScrollBarEnabled(boolean)
8313       * @see #setVerticalScrollBarEnabled(boolean)
8314       */
8315      protected boolean awakenScrollBars(int startDelay, boolean invalidate) {
8316          final ScrollabilityCache scrollCache = mScrollCache;
8317  
8318          if (scrollCache == null || !scrollCache.fadeScrollBars) {
8319              return false;
8320          }
8321  
8322          if (scrollCache.scrollBar == null) {
8323              scrollCache.scrollBar = new ScrollBarDrawable();
8324          }
8325  
8326          if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) {
8327  
8328              if (invalidate) {
8329                  // Invalidate to show the scrollbars
8330                  invalidate(true);
8331              }
8332  
8333              if (scrollCache.state == ScrollabilityCache.OFF) {
8334                  // FIXME: this is copied from WindowManagerService.
8335                  // We should get this value from the system when it
8336                  // is possible to do so.
8337                  final int KEY_REPEAT_FIRST_DELAY = 750;
8338                  startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay);
8339              }
8340  
8341              // Tell mScrollCache when we should start fading. This may
8342              // extend the fade start time if one was already scheduled
8343              long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay;
8344              scrollCache.fadeStartTime = fadeStartTime;
8345              scrollCache.state = ScrollabilityCache.ON;
8346  
8347              // Schedule our fader to run, unscheduling any old ones first
8348              if (mAttachInfo != null) {
8349                  mAttachInfo.mHandler.removeCallbacks(scrollCache);
8350                  mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime);
8351              }
8352  
8353              return true;
8354          }
8355  
8356          return false;
8357      }
8358  
8359      /**
8360       * Do not invalidate views which are not visible and which are not running an animation. They
8361       * will not get drawn and they should not set dirty flags as if they will be drawn
8362       */
8363      private boolean skipInvalidate() {
8364          return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null &&
8365                  (!(mParent instanceof ViewGroup) ||
8366                          !((ViewGroup) mParent).isViewTransitioning(this));
8367      }
8368      /**
8369       * Mark the area defined by dirty as needing to be drawn. If the view is
8370       * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point
8371       * in the future. This must be called from a UI thread. To call from a non-UI
8372       * thread, call {@link #postInvalidate()}.
8373       *
8374       * WARNING: This method is destructive to dirty.
8375       * @param dirty the rectangle representing the bounds of the dirty region
8376       */
8377      public void invalidate(Rect dirty) {
8378          if (ViewDebug.TRACE_HIERARCHY) {
8379              ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE);
8380          }
8381  
8382          if (skipInvalidate()) {
8383              return;
8384          }
8385          if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) ||
8386                  (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID ||
8387                  (mPrivateFlags & INVALIDATED) != INVALIDATED) {
8388              mPrivateFlags &= ~DRAWING_CACHE_VALID;
8389              mPrivateFlags |= INVALIDATED;
8390              mPrivateFlags |= DIRTY;
8391              final ViewParent p = mParent;
8392              final AttachInfo ai = mAttachInfo;
8393              //noinspection PointlessBooleanExpression,ConstantConditions
8394              if (!HardwareRenderer.RENDER_DIRTY_REGIONS) {
8395                  if (p != null && ai != null && ai.mHardwareAccelerated) {
8396                      // fast-track for GL-enabled applications; just invalidate the whole hierarchy
8397                      // with a null dirty rect, which tells the ViewAncestor to redraw everything
8398                      p.invalidateChild(this, null);
8399                      return;
8400                  }
8401              }
8402              if (p != null && ai != null) {
8403                  final int scrollX = mScrollX;
8404                  final int scrollY = mScrollY;
8405                  final Rect r = ai.mTmpInvalRect;
8406                  r.set(dirty.left - scrollX, dirty.top - scrollY,
8407                          dirty.right - scrollX, dirty.bottom - scrollY);
8408                  mParent.invalidateChild(this, r);
8409              }
8410          }
8411      }
8412  
8413      /**
8414       * Mark the area defined by the rect (l,t,r,b) as needing to be drawn.
8415       * The coordinates of the dirty rect are relative to the view.
8416       * If the view is visible, {@link #onDraw(android.graphics.Canvas)}
8417       * will be called at some point in the future. This must be called from
8418       * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}.
8419       * @param l the left position of the dirty region
8420       * @param t the top position of the dirty region
8421       * @param r the right position of the dirty region
8422       * @param b the bottom position of the dirty region
8423       */
8424      public void invalidate(int l, int t, int r, int b) {
8425          if (ViewDebug.TRACE_HIERARCHY) {
8426              ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE);
8427          }
8428  
8429          if (skipInvalidate()) {
8430              return;
8431          }
8432          if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) ||
8433                  (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID ||
8434                  (mPrivateFlags & INVALIDATED) != INVALIDATED) {
8435              mPrivateFlags &= ~DRAWING_CACHE_VALID;
8436              mPrivateFlags |= INVALIDATED;
8437              mPrivateFlags |= DIRTY;
8438              final ViewParent p = mParent;
8439              final AttachInfo ai = mAttachInfo;
8440              //noinspection PointlessBooleanExpression,ConstantConditions
8441              if (!HardwareRenderer.RENDER_DIRTY_REGIONS) {
8442                  if (p != null && ai != null && ai.mHardwareAccelerated) {
8443                      // fast-track for GL-enabled applications; just invalidate the whole hierarchy
8444                      // with a null dirty rect, which tells the ViewAncestor to redraw everything
8445                      p.invalidateChild(this, null);
8446                      return;
8447                  }
8448              }
8449              if (p != null && ai != null && l < r && t < b) {
8450                  final int scrollX = mScrollX;
8451                  final int scrollY = mScrollY;
8452                  final Rect tmpr = ai.mTmpInvalRect;
8453                  tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY);
8454                  p.invalidateChild(this, tmpr);
8455              }
8456          }
8457      }
8458  
8459      /**
8460       * Invalidate the whole view. If the view is visible,
8461       * {@link #onDraw(android.graphics.Canvas)} will be called at some point in
8462       * the future. This must be called from a UI thread. To call from a non-UI thread,
8463       * call {@link #postInvalidate()}.
8464       */
8465      public void invalidate() {
8466          invalidate(true);
8467      }
8468  
8469      /**
8470       * This is where the invalidate() work actually happens. A full invalidate()
8471       * causes the drawing cache to be invalidated, but this function can be called with
8472       * invalidateCache set to false to skip that invalidation step for cases that do not
8473       * need it (for example, a component that remains at the same dimensions with the same
8474       * content).
8475       *
8476       * @param invalidateCache Whether the drawing cache for this view should be invalidated as
8477       * well. This is usually true for a full invalidate, but may be set to false if the
8478       * View's contents or dimensions have not changed.
8479       */
8480      void invalidate(boolean invalidateCache) {
8481          if (ViewDebug.TRACE_HIERARCHY) {
8482              ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE);
8483          }
8484  
8485          if (skipInvalidate()) {
8486              return;
8487          }
8488          if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) ||
8489                  (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) ||
8490                  (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) {
8491              mLastIsOpaque = isOpaque();
8492              mPrivateFlags &= ~DRAWN;
8493              mPrivateFlags |= DIRTY;
8494              if (invalidateCache) {
8495                  mPrivateFlags |= INVALIDATED;
8496                  mPrivateFlags &= ~DRAWING_CACHE_VALID;
8497              }
8498              final AttachInfo ai = mAttachInfo;
8499              final ViewParent p = mParent;
8500              //noinspection PointlessBooleanExpression,ConstantConditions
8501              if (!HardwareRenderer.RENDER_DIRTY_REGIONS) {
8502                  if (p != null && ai != null && ai.mHardwareAccelerated) {
8503                      // fast-track for GL-enabled applications; just invalidate the whole hierarchy
8504                      // with a null dirty rect, which tells the ViewAncestor to redraw everything
8505                      p.invalidateChild(this, null);
8506                      return;
8507                  }
8508              }
8509  
8510              if (p != null && ai != null) {
8511                  final Rect r = ai.mTmpInvalRect;
8512                  r.set(0, 0, mRight - mLeft, mBottom - mTop);
8513                  // Don't call invalidate -- we don't want to internally scroll
8514                  // our own bounds
8515                  p.invalidateChild(this, r);
8516              }
8517          }
8518      }
8519  
8520      /**
8521       * @hide
8522       */
8523      public void fastInvalidate() {
8524          if (skipInvalidate()) {
8525              return;
8526          }
8527          if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) ||
8528              (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID ||
8529              (mPrivateFlags & INVALIDATED) != INVALIDATED) {
8530              if (mParent instanceof View) {
8531                  ((View) mParent).mPrivateFlags |= INVALIDATED;
8532              }
8533              mPrivateFlags &= ~DRAWN;
8534              mPrivateFlags |= DIRTY;
8535              mPrivateFlags |= INVALIDATED;
8536              mPrivateFlags &= ~DRAWING_CACHE_VALID;
8537              if (mParent != null && mAttachInfo != null) {
8538                  if (mAttachInfo.mHardwareAccelerated) {
8539                      mParent.invalidateChild(this, null);
8540                  } else {
8541                      final Rect r = mAttachInfo.mTmpInvalRect;
8542                      r.set(0, 0, mRight - mLeft, mBottom - mTop);
8543                      // Don't call invalidate -- we don't want to internally scroll
8544                      // our own bounds
8545                      mParent.invalidateChild(this, r);
8546                  }
8547              }
8548          }
8549      }
8550  
8551      /**
8552       * Used to indicate that the parent of this view should clear its caches. This functionality
8553       * is used to force the parent to rebuild its display list (when hardware-accelerated),
8554       * which is necessary when various parent-managed properties of the view change, such as
8555       * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only
8556       * clears the parent caches and does not causes an invalidate event.
8557       *
8558       * @hide
8559       */
8560      protected void invalidateParentCaches() {
8561          if (mParent instanceof View) {
8562              ((View) mParent).mPrivateFlags |= INVALIDATED;
8563          }
8564      }
8565  
8566      /**
8567       * Used to indicate that the parent of this view should be invalidated. This functionality
8568       * is used to force the parent to rebuild its display list (when hardware-accelerated),
8569       * which is necessary when various parent-managed properties of the view change, such as
8570       * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate
8571       * an invalidation event to the parent.
8572       *
8573       * @hide
8574       */
8575      protected void invalidateParentIfNeeded() {
8576          if (isHardwareAccelerated() && mParent instanceof View) {
8577              ((View) mParent).invalidate(true);
8578          }
8579      }
8580  
8581      /**
8582       * Indicates whether this View is opaque. An opaque View guarantees that it will
8583       * draw all the pixels overlapping its bounds using a fully opaque color.
8584       *
8585       * Subclasses of View should override this method whenever possible to indicate
8586       * whether an instance is opaque. Opaque Views are treated in a special way by
8587       * the View hierarchy, possibly allowing it to perform optimizations during
8588       * invalidate/draw passes.
8589       *
8590       * @return True if this View is guaranteed to be fully opaque, false otherwise.
8591       */
8592      @ViewDebug.ExportedProperty(category = "drawing")
8593      public boolean isOpaque() {
8594          return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK &&
8595                  ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1)
8596                          >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD);
8597      }
8598  
8599      /**
8600       * @hide
8601       */
8602      protected void computeOpaqueFlags() {
8603          // Opaque if:
8604          //   - Has a background
8605          //   - Background is opaque
8606          //   - Doesn't have scrollbars or scrollbars are inside overlay
8607  
8608          if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) {
8609              mPrivateFlags |= OPAQUE_BACKGROUND;
8610          } else {
8611              mPrivateFlags &= ~OPAQUE_BACKGROUND;
8612          }
8613  
8614          final int flags = mViewFlags;
8615          if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) ||
8616                  (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) {
8617              mPrivateFlags |= OPAQUE_SCROLLBARS;
8618          } else {
8619              mPrivateFlags &= ~OPAQUE_SCROLLBARS;
8620          }
8621      }
8622  
8623      /**
8624       * @hide
8625       */
8626      protected boolean hasOpaqueScrollbars() {
8627          return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS;
8628      }
8629  
8630      /**
8631       * @return A handler associated with the thread running the View. This
8632       * handler can be used to pump events in the UI events queue.
8633       */
8634      public Handler getHandler() {
8635          if (mAttachInfo != null) {
8636              return mAttachInfo.mHandler;
8637          }
8638          return null;
8639      }
8640  
8641      /**
8642       * <p>Causes the Runnable to be added to the message queue.
8643       * The runnable will be run on the user interface thread.</p>
8644       *
8645       * <p>This method can be invoked from outside of the UI thread
8646       * only when this View is attached to a window.</p>
8647       *
8648       * @param action The Runnable that will be executed.
8649       *
8650       * @return Returns true if the Runnable was successfully placed in to the
8651       *         message queue.  Returns false on failure, usually because the
8652       *         looper processing the message queue is exiting.
8653       */
8654      public boolean post(Runnable action) {
8655          Handler handler;
8656          AttachInfo attachInfo = mAttachInfo;
8657          if (attachInfo != null) {
8658              handler = attachInfo.mHandler;
8659          } else {
8660              // Assume that post will succeed later
8661              ViewRootImpl.getRunQueue().post(action);
8662              return true;
8663          }
8664  
8665          return handler.post(action);
8666      }
8667  
8668      /**
8669       * <p>Causes the Runnable to be added to the message queue, to be run
8670       * after the specified amount of time elapses.
8671       * The runnable will be run on the user interface thread.</p>
8672       *
8673       * <p>This method can be invoked from outside of the UI thread
8674       * only when this View is attached to a window.</p>
8675       *
8676       * @param action The Runnable that will be executed.
8677       * @param delayMillis The delay (in milliseconds) until the Runnable
8678       *        will be executed.
8679       *
8680       * @return true if the Runnable was successfully placed in to the
8681       *         message queue.  Returns false on failure, usually because the
8682       *         looper processing the message queue is exiting.  Note that a
8683       *         result of true does not mean the Runnable will be processed --
8684       *         if the looper is quit before the delivery time of the message
8685       *         occurs then the message will be dropped.
8686       */
8687      public boolean postDelayed(Runnable action, long delayMillis) {
8688          Handler handler;
8689          AttachInfo attachInfo = mAttachInfo;
8690          if (attachInfo != null) {
8691              handler = attachInfo.mHandler;
8692          } else {
8693              // Assume that post will succeed later
8694              ViewRootImpl.getRunQueue().postDelayed(action, delayMillis);
8695              return true;
8696          }
8697  
8698          return handler.postDelayed(action, delayMillis);
8699      }
8700  
8701      /**
8702       * <p>Removes the specified Runnable from the message queue.</p>
8703       *
8704       * <p>This method can be invoked from outside of the UI thread
8705       * only when this View is attached to a window.</p>
8706       *
8707       * @param action The Runnable to remove from the message handling queue
8708       *
8709       * @return true if this view could ask the Handler to remove the Runnable,
8710       *         false otherwise. When the returned value is true, the Runnable
8711       *         may or may not have been actually removed from the message queue
8712       *         (for instance, if the Runnable was not in the queue already.)
8713       */
8714      public boolean removeCallbacks(Runnable action) {
8715          Handler handler;
8716          AttachInfo attachInfo = mAttachInfo;
8717          if (attachInfo != null) {
8718              handler = attachInfo.mHandler;
8719          } else {
8720              // Assume that post will succeed later
8721              ViewRootImpl.getRunQueue().removeCallbacks(action);
8722              return true;
8723          }
8724  
8725          handler.removeCallbacks(action);
8726          return true;
8727      }
8728  
8729      /**
8730       * <p>Cause an invalidate to happen on a subsequent cycle through the event loop.
8731       * Use this to invalidate the View from a non-UI thread.</p>
8732       *
8733       * <p>This method can be invoked from outside of the UI thread
8734       * only when this View is attached to a window.</p>
8735       *
8736       * @see #invalidate()
8737       */
8738      public void postInvalidate() {
8739          postInvalidateDelayed(0);
8740      }
8741  
8742      /**
8743       * <p>Cause an invalidate of the specified area to happen on a subsequent cycle
8744       * through the event loop. Use this to invalidate the View from a non-UI thread.</p>
8745       *
8746       * <p>This method can be invoked from outside of the UI thread
8747       * only when this View is attached to a window.</p>
8748       *
8749       * @param left The left coordinate of the rectangle to invalidate.
8750       * @param top The top coordinate of the rectangle to invalidate.
8751       * @param right The right coordinate of the rectangle to invalidate.
8752       * @param bottom The bottom coordinate of the rectangle to invalidate.
8753       *
8754       * @see #invalidate(int, int, int, int)
8755       * @see #invalidate(Rect)
8756       */
8757      public void postInvalidate(int left, int top, int right, int bottom) {
8758          postInvalidateDelayed(0, left, top, right, bottom);
8759      }
8760  
8761      /**
8762       * <p>Cause an invalidate to happen on a subsequent cycle through the event
8763       * loop. Waits for the specified amount of time.</p>
8764       *
8765       * <p>This method can be invoked from outside of the UI thread
8766       * only when this View is attached to a window.</p>
8767       *
8768       * @param delayMilliseconds the duration in milliseconds to delay the
8769       *         invalidation by
8770       */
8771      public void postInvalidateDelayed(long delayMilliseconds) {
8772          // We try only with the AttachInfo because there's no point in invalidating
8773          // if we are not attached to our window
8774          AttachInfo attachInfo = mAttachInfo;
8775          if (attachInfo != null) {
8776              Message msg = Message.obtain();
8777              msg.what = AttachInfo.INVALIDATE_MSG;
8778              msg.obj = this;
8779              attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds);
8780          }
8781      }
8782  
8783      /**
8784       * <p>Cause an invalidate of the specified area to happen on a subsequent cycle
8785       * through the event loop. Waits for the specified amount of time.</p>
8786       *
8787       * <p>This method can be invoked from outside of the UI thread
8788       * only when this View is attached to a window.</p>
8789       *
8790       * @param delayMilliseconds the duration in milliseconds to delay the
8791       *         invalidation by
8792       * @param left The left coordinate of the rectangle to invalidate.
8793       * @param top The top coordinate of the rectangle to invalidate.
8794       * @param right The right coordinate of the rectangle to invalidate.
8795       * @param bottom The bottom coordinate of the rectangle to invalidate.
8796       */
8797      public void postInvalidateDelayed(long delayMilliseconds, int left, int top,
8798              int right, int bottom) {
8799  
8800          // We try only with the AttachInfo because there's no point in invalidating
8801          // if we are not attached to our window
8802          AttachInfo attachInfo = mAttachInfo;
8803          if (attachInfo != null) {
8804              final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire();
8805              info.target = this;
8806              info.left = left;
8807              info.top = top;
8808              info.right = right;
8809              info.bottom = bottom;
8810  
8811              final Message msg = Message.obtain();
8812              msg.what = AttachInfo.INVALIDATE_RECT_MSG;
8813              msg.obj = info;
8814              attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds);
8815          }
8816      }
8817  
8818      /**
8819       * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event.
8820       * This event is sent at most once every
8821       * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}.
8822       */
8823      private void postSendViewScrolledAccessibilityEventCallback() {
8824          if (mSendViewScrolledAccessibilityEvent == null) {
8825              mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent();
8826          }
8827          if (!mSendViewScrolledAccessibilityEvent.mIsPending) {
8828              mSendViewScrolledAccessibilityEvent.mIsPending = true;
8829              postDelayed(mSendViewScrolledAccessibilityEvent,
8830                      ViewConfiguration.getSendRecurringAccessibilityEventsInterval());
8831          }
8832      }
8833  
8834      /**
8835       * Called by a parent to request that a child update its values for mScrollX
8836       * and mScrollY if necessary. This will typically be done if the child is
8837       * animating a scroll using a {@link android.widget.Scroller Scroller}
8838       * object.
8839       */
8840      public void computeScroll() {
8841      }
8842  
8843      /**
8844       * <p>Indicate whether the horizontal edges are faded when the view is
8845       * scrolled horizontally.</p>
8846       *
8847       * @return true if the horizontal edges should are faded on scroll, false
8848       *         otherwise
8849       *
8850       * @see #setHorizontalFadingEdgeEnabled(boolean)
8851       * @attr ref android.R.styleable#View_requiresFadingEdge
8852       */
8853      public boolean isHorizontalFadingEdgeEnabled() {
8854          return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL;
8855      }
8856  
8857      /**
8858       * <p>Define whether the horizontal edges should be faded when this view
8859       * is scrolled horizontally.</p>
8860       *
8861       * @param horizontalFadingEdgeEnabled true if the horizontal edges should
8862       *                                    be faded when the view is scrolled
8863       *                                    horizontally
8864       *
8865       * @see #isHorizontalFadingEdgeEnabled()
8866       * @attr ref android.R.styleable#View_requiresFadingEdge
8867       */
8868      public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) {
8869          if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) {
8870              if (horizontalFadingEdgeEnabled) {
8871                  initScrollCache();
8872              }
8873  
8874              mViewFlags ^= FADING_EDGE_HORIZONTAL;
8875          }
8876      }
8877  
8878      /**
8879       * <p>Indicate whether the vertical edges are faded when the view is
8880       * scrolled horizontally.</p>
8881       *
8882       * @return true if the vertical edges should are faded on scroll, false
8883       *         otherwise
8884       *
8885       * @see #setVerticalFadingEdgeEnabled(boolean)
8886       * @attr ref android.R.styleable#View_requiresFadingEdge
8887       */
8888      public boolean isVerticalFadingEdgeEnabled() {
8889          return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL;
8890      }
8891  
8892      /**
8893       * <p>Define whether the vertical edges should be faded when this view
8894       * is scrolled vertically.</p>
8895       *
8896       * @param verticalFadingEdgeEnabled true if the vertical edges should
8897       *                                  be faded when the view is scrolled
8898       *                                  vertically
8899       *
8900       * @see #isVerticalFadingEdgeEnabled()
8901       * @attr ref android.R.styleable#View_requiresFadingEdge
8902       */
8903      public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) {
8904          if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) {
8905              if (verticalFadingEdgeEnabled) {
8906                  initScrollCache();
8907              }
8908  
8909              mViewFlags ^= FADING_EDGE_VERTICAL;
8910          }
8911      }
8912  
8913      /**
8914       * Returns the strength, or intensity, of the top faded edge. The strength is
8915       * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
8916       * returns 0.0 or 1.0 but no value in between.
8917       *
8918       * Subclasses should override this method to provide a smoother fade transition
8919       * when scrolling occurs.
8920       *
8921       * @return the intensity of the top fade as a float between 0.0f and 1.0f
8922       */
8923      protected float getTopFadingEdgeStrength() {
8924          return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f;
8925      }
8926  
8927      /**
8928       * Returns the strength, or intensity, of the bottom faded edge. The strength is
8929       * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
8930       * returns 0.0 or 1.0 but no value in between.
8931       *
8932       * Subclasses should override this method to provide a smoother fade transition
8933       * when scrolling occurs.
8934       *
8935       * @return the intensity of the bottom fade as a float between 0.0f and 1.0f
8936       */
8937      protected float getBottomFadingEdgeStrength() {
8938          return computeVerticalScrollOffset() + computeVerticalScrollExtent() <
8939                  computeVerticalScrollRange() ? 1.0f : 0.0f;
8940      }
8941  
8942      /**
8943       * Returns the strength, or intensity, of the left faded edge. The strength is
8944       * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
8945       * returns 0.0 or 1.0 but no value in between.
8946       *
8947       * Subclasses should override this method to provide a smoother fade transition
8948       * when scrolling occurs.
8949       *
8950       * @return the intensity of the left fade as a float between 0.0f and 1.0f
8951       */
8952      protected float getLeftFadingEdgeStrength() {
8953          return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f;
8954      }
8955  
8956      /**
8957       * Returns the strength, or intensity, of the right faded edge. The strength is
8958       * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
8959       * returns 0.0 or 1.0 but no value in between.
8960       *
8961       * Subclasses should override this method to provide a smoother fade transition
8962       * when scrolling occurs.
8963       *
8964       * @return the intensity of the right fade as a float between 0.0f and 1.0f
8965       */
8966      protected float getRightFadingEdgeStrength() {
8967          return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() <
8968                  computeHorizontalScrollRange() ? 1.0f : 0.0f;
8969      }
8970  
8971      /**
8972       * <p>Indicate whether the horizontal scrollbar should be drawn or not. The
8973       * scrollbar is not drawn by default.</p>
8974       *
8975       * @return true if the horizontal scrollbar should be painted, false
8976       *         otherwise
8977       *
8978       * @see #setHorizontalScrollBarEnabled(boolean)
8979       */
8980      public boolean isHorizontalScrollBarEnabled() {
8981          return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL;
8982      }
8983  
8984      /**
8985       * <p>Define whether the horizontal scrollbar should be drawn or not. The
8986       * scrollbar is not drawn by default.</p>
8987       *
8988       * @param horizontalScrollBarEnabled true if the horizontal scrollbar should
8989       *                                   be painted
8990       *
8991       * @see #isHorizontalScrollBarEnabled()
8992       */
8993      public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) {
8994          if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) {
8995              mViewFlags ^= SCROLLBARS_HORIZONTAL;
8996              computeOpaqueFlags();
8997              resolvePadding();
8998          }
8999      }
9000  
9001      /**
9002       * <p>Indicate whether the vertical scrollbar should be drawn or not. The
9003       * scrollbar is not drawn by default.</p>
9004       *
9005       * @return true if the vertical scrollbar should be painted, false
9006       *         otherwise
9007       *
9008       * @see #setVerticalScrollBarEnabled(boolean)
9009       */
9010      public boolean isVerticalScrollBarEnabled() {
9011          return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL;
9012      }
9013  
9014      /**
9015       * <p>Define whether the vertical scrollbar should be drawn or not. The
9016       * scrollbar is not drawn by default.</p>
9017       *
9018       * @param verticalScrollBarEnabled true if the vertical scrollbar should
9019       *                                 be painted
9020       *
9021       * @see #isVerticalScrollBarEnabled()
9022       */
9023      public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) {
9024          if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) {
9025              mViewFlags ^= SCROLLBARS_VERTICAL;
9026              computeOpaqueFlags();
9027              resolvePadding();
9028          }
9029      }
9030  
9031      /**
9032       * @hide
9033       */
9034      protected void recomputePadding() {
9035          setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom);
9036      }
9037  
9038      /**
9039       * Define whether scrollbars will fade when the view is not scrolling.
9040       *
9041       * @param fadeScrollbars wheter to enable fading
9042       *
9043       */
9044      public void setScrollbarFadingEnabled(boolean fadeScrollbars) {
9045          initScrollCache();
9046          final ScrollabilityCache scrollabilityCache = mScrollCache;
9047          scrollabilityCache.fadeScrollBars = fadeScrollbars;
9048          if (fadeScrollbars) {
9049              scrollabilityCache.state = ScrollabilityCache.OFF;
9050          } else {
9051              scrollabilityCache.state = ScrollabilityCache.ON;
9052          }
9053      }
9054  
9055      /**
9056       *
9057       * Returns true if scrollbars will fade when this view is not scrolling
9058       *
9059       * @return true if scrollbar fading is enabled
9060       */
9061      public boolean isScrollbarFadingEnabled() {
9062          return mScrollCache != null && mScrollCache.fadeScrollBars;
9063      }
9064  
9065      /**
9066       * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or
9067       * inset. When inset, they add to the padding of the view. And the scrollbars
9068       * can be drawn inside the padding area or on the edge of the view. For example,
9069       * if a view has a background drawable and you want to draw the scrollbars
9070       * inside the padding specified by the drawable, you can use
9071       * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to
9072       * appear at the edge of the view, ignoring the padding, then you can use
9073       * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p>
9074       * @param style the style of the scrollbars. Should be one of
9075       * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET,
9076       * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.
9077       * @see #SCROLLBARS_INSIDE_OVERLAY
9078       * @see #SCROLLBARS_INSIDE_INSET
9079       * @see #SCROLLBARS_OUTSIDE_OVERLAY
9080       * @see #SCROLLBARS_OUTSIDE_INSET
9081       */
9082      public void setScrollBarStyle(int style) {
9083          if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) {
9084              mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK);
9085              computeOpaqueFlags();
9086              resolvePadding();
9087          }
9088      }
9089  
9090      /**
9091       * <p>Returns the current scrollbar style.</p>
9092       * @return the current scrollbar style
9093       * @see #SCROLLBARS_INSIDE_OVERLAY
9094       * @see #SCROLLBARS_INSIDE_INSET
9095       * @see #SCROLLBARS_OUTSIDE_OVERLAY
9096       * @see #SCROLLBARS_OUTSIDE_INSET
9097       */
9098      @ViewDebug.ExportedProperty(mapping = {
9099              @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"),
9100              @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"),
9101              @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"),
9102              @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET")
9103      })
9104      public int getScrollBarStyle() {
9105          return mViewFlags & SCROLLBARS_STYLE_MASK;
9106      }
9107  
9108      /**
9109       * <p>Compute the horizontal range that the horizontal scrollbar
9110       * represents.</p>
9111       *
9112       * <p>The range is expressed in arbitrary units that must be the same as the
9113       * units used by {@link #computeHorizontalScrollExtent()} and
9114       * {@link #computeHorizontalScrollOffset()}.</p>
9115       *
9116       * <p>The default range is the drawing width of this view.</p>
9117       *
9118       * @return the total horizontal range represented by the horizontal
9119       *         scrollbar
9120       *
9121       * @see #computeHorizontalScrollExtent()
9122       * @see #computeHorizontalScrollOffset()
9123       * @see android.widget.ScrollBarDrawable
9124       */
9125      protected int computeHorizontalScrollRange() {
9126          return getWidth();
9127      }
9128  
9129      /**
9130       * <p>Compute the horizontal offset of the horizontal scrollbar's thumb
9131       * within the horizontal range. This value is used to compute the position
9132       * of the thumb within the scrollbar's track.</p>
9133       *
9134       * <p>The range is expressed in arbitrary units that must be the same as the
9135       * units used by {@link #computeHorizontalScrollRange()} and
9136       * {@link #computeHorizontalScrollExtent()}.</p>
9137       *
9138       * <p>The default offset is the scroll offset of this view.</p>
9139       *
9140       * @return the horizontal offset of the scrollbar's thumb
9141       *
9142       * @see #computeHorizontalScrollRange()
9143       * @see #computeHorizontalScrollExtent()
9144       * @see android.widget.ScrollBarDrawable
9145       */
9146      protected int computeHorizontalScrollOffset() {
9147          return mScrollX;
9148      }
9149  
9150      /**
9151       * <p>Compute the horizontal extent of the horizontal scrollbar's thumb
9152       * within the horizontal range. This value is used to compute the length
9153       * of the thumb within the scrollbar's track.</p>
9154       *
9155       * <p>The range is expressed in arbitrary units that must be the same as the
9156       * units used by {@link #computeHorizontalScrollRange()} and
9157       * {@link #computeHorizontalScrollOffset()}.</p>
9158       *
9159       * <p>The default extent is the drawing width of this view.</p>
9160       *
9161       * @return the horizontal extent of the scrollbar's thumb
9162       *
9163       * @see #computeHorizontalScrollRange()
9164       * @see #computeHorizontalScrollOffset()
9165       * @see android.widget.ScrollBarDrawable
9166       */
9167      protected int computeHorizontalScrollExtent() {
9168          return getWidth();
9169      }
9170  
9171      /**
9172       * <p>Compute the vertical range that the vertical scrollbar represents.</p>
9173       *
9174       * <p>The range is expressed in arbitrary units that must be the same as the
9175       * units used by {@link #computeVerticalScrollExtent()} and
9176       * {@link #computeVerticalScrollOffset()}.</p>
9177       *
9178       * @return the total vertical range represented by the vertical scrollbar
9179       *
9180       * <p>The default range is the drawing height of this view.</p>
9181       *
9182       * @see #computeVerticalScrollExtent()
9183       * @see #computeVerticalScrollOffset()
9184       * @see android.widget.ScrollBarDrawable
9185       */
9186      protected int computeVerticalScrollRange() {
9187          return getHeight();
9188      }
9189  
9190      /**
9191       * <p>Compute the vertical offset of the vertical scrollbar's thumb
9192       * within the horizontal range. This value is used to compute the position
9193       * of the thumb within the scrollbar's track.</p>
9194       *
9195       * <p>The range is expressed in arbitrary units that must be the same as the
9196       * units used by {@link #computeVerticalScrollRange()} and
9197       * {@link #computeVerticalScrollExtent()}.</p>
9198       *
9199       * <p>The default offset is the scroll offset of this view.</p>
9200       *
9201       * @return the vertical offset of the scrollbar's thumb
9202       *
9203       * @see #computeVerticalScrollRange()
9204       * @see #computeVerticalScrollExtent()
9205       * @see android.widget.ScrollBarDrawable
9206       */
9207      protected int computeVerticalScrollOffset() {
9208          return mScrollY;
9209      }
9210  
9211      /**
9212       * <p>Compute the vertical extent of the horizontal scrollbar's thumb
9213       * within the vertical range. This value is used to compute the length
9214       * of the thumb within the scrollbar's track.</p>
9215       *
9216       * <p>The range is expressed in arbitrary units that must be the same as the
9217       * units used by {@link #computeVerticalScrollRange()} and
9218       * {@link #computeVerticalScrollOffset()}.</p>
9219       *
9220       * <p>The default extent is the drawing height of this view.</p>
9221       *
9222       * @return the vertical extent of the scrollbar's thumb
9223       *
9224       * @see #computeVerticalScrollRange()
9225       * @see #computeVerticalScrollOffset()
9226       * @see android.widget.ScrollBarDrawable
9227       */
9228      protected int computeVerticalScrollExtent() {
9229          return getHeight();
9230      }
9231  
9232      /**
9233       * Check if this view can be scrolled horizontally in a certain direction.
9234       *
9235       * @param direction Negative to check scrolling left, positive to check scrolling right.
9236       * @return true if this view can be scrolled in the specified direction, false otherwise.
9237       */
9238      public boolean canScrollHorizontally(int direction) {
9239          final int offset = computeHorizontalScrollOffset();
9240          final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent();
9241          if (range == 0) return false;
9242          if (direction < 0) {
9243              return offset > 0;
9244          } else {
9245              return offset < range - 1;
9246          }
9247      }
9248  
9249      /**
9250       * Check if this view can be scrolled vertically in a certain direction.
9251       *
9252       * @param direction Negative to check scrolling up, positive to check scrolling down.
9253       * @return true if this view can be scrolled in the specified direction, false otherwise.
9254       */
9255      public boolean canScrollVertically(int direction) {
9256          final int offset = computeVerticalScrollOffset();
9257          final int range = computeVerticalScrollRange() - computeVerticalScrollExtent();
9258          if (range == 0) return false;
9259          if (direction < 0) {
9260              return offset > 0;
9261          } else {
9262              return offset < range - 1;
9263          }
9264      }
9265  
9266      /**
9267       * <p>Request the drawing of the horizontal and the vertical scrollbar. The
9268       * scrollbars are painted only if they have been awakened first.</p>
9269       *
9270       * @param canvas the canvas on which to draw the scrollbars
9271       *
9272       * @see #awakenScrollBars(int)
9273       */
9274      protected final void onDrawScrollBars(Canvas canvas) {
9275          // scrollbars are drawn only when the animation is running
9276          final ScrollabilityCache cache = mScrollCache;
9277          if (cache != null) {
9278  
9279              int state = cache.state;
9280  
9281              if (state == ScrollabilityCache.OFF) {
9282                  return;
9283              }
9284  
9285              boolean invalidate = false;
9286  
9287              if (state == ScrollabilityCache.FADING) {
9288                  // We're fading -- get our fade interpolation
9289                  if (cache.interpolatorValues == null) {
9290                      cache.interpolatorValues = new float[1];
9291                  }
9292  
9293                  float[] values = cache.interpolatorValues;
9294  
9295                  // Stops the animation if we're done
9296                  if (cache.scrollBarInterpolator.timeToValues(values) ==
9297                          Interpolator.Result.FREEZE_END) {
9298                      cache.state = ScrollabilityCache.OFF;
9299                  } else {
9300                      cache.scrollBar.setAlpha(Math.round(values[0]));
9301                  }
9302  
9303                  // This will make the scroll bars inval themselves after
9304                  // drawing. We only want this when we're fading so that
9305                  // we prevent excessive redraws
9306                  invalidate = true;
9307              } else {
9308                  // We're just on -- but we may have been fading before so
9309                  // reset alpha
9310                  cache.scrollBar.setAlpha(255);
9311              }
9312  
9313  
9314              final int viewFlags = mViewFlags;
9315  
9316              final boolean drawHorizontalScrollBar =
9317                  (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL;
9318              final boolean drawVerticalScrollBar =
9319                  (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL
9320                  && !isVerticalScrollBarHidden();
9321  
9322              if (drawVerticalScrollBar || drawHorizontalScrollBar) {
9323                  final int width = mRight - mLeft;
9324                  final int height = mBottom - mTop;
9325  
9326                  final ScrollBarDrawable scrollBar = cache.scrollBar;
9327  
9328                  final int scrollX = mScrollX;
9329                  final int scrollY = mScrollY;
9330                  final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
9331  
9332                  int left, top, right, bottom;
9333  
9334                  if (drawHorizontalScrollBar) {
9335                      int size = scrollBar.getSize(false);
9336                      if (size <= 0) {
9337                          size = cache.scrollBarSize;
9338                      }
9339  
9340                      scrollBar.setParameters(computeHorizontalScrollRange(),
9341                                              computeHorizontalScrollOffset(),
9342                                              computeHorizontalScrollExtent(), false);
9343                      final int verticalScrollBarGap = drawVerticalScrollBar ?
9344                              getVerticalScrollbarWidth() : 0;
9345                      top = scrollY + height - size - (mUserPaddingBottom & inside);
9346                      left = scrollX + (mPaddingLeft & inside);
9347                      right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap;
9348                      bottom = top + size;
9349                      onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom);
9350                      if (invalidate) {
9351                          invalidate(left, top, right, bottom);
9352                      }
9353                  }
9354  
9355                  if (drawVerticalScrollBar) {
9356                      int size = scrollBar.getSize(true);
9357                      if (size <= 0) {
9358                          size = cache.scrollBarSize;
9359                      }
9360  
9361                      scrollBar.setParameters(computeVerticalScrollRange(),
9362                                              computeVerticalScrollOffset(),
9363                                              computeVerticalScrollExtent(), true);
9364                      switch (mVerticalScrollbarPosition) {
9365                          default:
9366                          case SCROLLBAR_POSITION_DEFAULT:
9367                          case SCROLLBAR_POSITION_RIGHT:
9368                              left = scrollX + width - size - (mUserPaddingRight & inside);
9369                              break;
9370                          case SCROLLBAR_POSITION_LEFT:
9371                              left = scrollX + (mUserPaddingLeft & inside);
9372                              break;
9373                      }
9374                      top = scrollY + (mPaddingTop & inside);
9375                      right = left + size;
9376                      bottom = scrollY + height - (mUserPaddingBottom & inside);
9377                      onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom);
9378                      if (invalidate) {
9379                          invalidate(left, top, right, bottom);
9380                      }
9381                  }
9382              }
9383          }
9384      }
9385  
9386      /**
9387       * Override this if the vertical scrollbar needs to be hidden in a subclass, like when
9388       * FastScroller is visible.
9389       * @return whether to temporarily hide the vertical scrollbar
9390       * @hide
9391       */
9392      protected boolean isVerticalScrollBarHidden() {
9393          return false;
9394      }
9395  
9396      /**
9397       * <p>Draw the horizontal scrollbar if
9398       * {@link #isHorizontalScrollBarEnabled()} returns true.</p>
9399       *
9400       * @param canvas the canvas on which to draw the scrollbar
9401       * @param scrollBar the scrollbar's drawable
9402       *
9403       * @see #isHorizontalScrollBarEnabled()
9404       * @see #computeHorizontalScrollRange()
9405       * @see #computeHorizontalScrollExtent()
9406       * @see #computeHorizontalScrollOffset()
9407       * @see android.widget.ScrollBarDrawable
9408       * @hide
9409       */
9410      protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar,
9411              int l, int t, int r, int b) {
9412          scrollBar.setBounds(l, t, r, b);
9413          scrollBar.draw(canvas);
9414      }
9415  
9416      /**
9417       * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()}
9418       * returns true.</p>
9419       *
9420       * @param canvas the canvas on which to draw the scrollbar
9421       * @param scrollBar the scrollbar's drawable
9422       *
9423       * @see #isVerticalScrollBarEnabled()
9424       * @see #computeVerticalScrollRange()
9425       * @see #computeVerticalScrollExtent()
9426       * @see #computeVerticalScrollOffset()
9427       * @see android.widget.ScrollBarDrawable
9428       * @hide
9429       */
9430      protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar,
9431              int l, int t, int r, int b) {
9432          scrollBar.setBounds(l, t, r, b);
9433          scrollBar.draw(canvas);
9434      }
9435  
9436      /**
9437       * Implement this to do your drawing.
9438       *
9439       * @param canvas the canvas on which the background will be drawn
9440       */
9441      protected void onDraw(Canvas canvas) {
9442      }
9443  
9444      /*
9445       * Caller is responsible for calling requestLayout if necessary.
9446       * (This allows addViewInLayout to not request a new layout.)
9447       */
9448      void assignParent(ViewParent parent) {
9449          if (mParent == null) {
9450              mParent = parent;
9451          } else if (parent == null) {
9452              mParent = null;
9453          } else {
9454              throw new RuntimeException("view " + this + " being added, but"
9455                      + " it already has a parent");
9456          }
9457      }
9458  
9459      /**
9460       * This is called when the view is attached to a window.  At this point it
9461       * has a Surface and will start drawing.  Note that this function is
9462       * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)},
9463       * however it may be called any time before the first onDraw -- including
9464       * before or after {@link #onMeasure(int, int)}.
9465       *
9466       * @see #onDetachedFromWindow()
9467       */
9468      protected void onAttachedToWindow() {
9469          if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) {
9470              mParent.requestTransparentRegion(this);
9471          }
9472          if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) {
9473              initialAwakenScrollBars();
9474              mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH;
9475          }
9476          jumpDrawablesToCurrentState();
9477          // Order is important here: LayoutDirection MUST be resolved before Padding
9478          // and TextDirection
9479          resolveLayoutDirectionIfNeeded();
9480          resolvePadding();
9481          resolveTextDirection();
9482          if (isFocused()) {
9483              InputMethodManager imm = InputMethodManager.peekInstance();
9484              imm.focusIn(this);
9485          }
9486      }
9487  
9488      /**
9489       * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing
9490       * that the parent directionality can and will be resolved before its children.
9491       */
9492      private void resolveLayoutDirectionIfNeeded() {
9493          // Do not resolve if it is not needed
9494          if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) == LAYOUT_DIRECTION_RESOLVED) return;
9495  
9496          // Clear any previous layout direction resolution
9497          mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_RTL;
9498  
9499          // Reset also TextDirection as a change into LayoutDirection may impact the selected
9500          // TextDirectionHeuristic
9501          resetResolvedTextDirection();
9502  
9503          // Set resolved depending on layout direction
9504          switch (getLayoutDirection()) {
9505              case LAYOUT_DIRECTION_INHERIT:
9506                  // We cannot do the resolution if there is no parent
9507                  if (mParent == null) return;
9508  
9509                  // If this is root view, no need to look at parent's layout dir.
9510                  if (mParent instanceof ViewGroup) {
9511                      ViewGroup viewGroup = ((ViewGroup) mParent);
9512  
9513                      // Check if the parent view group can resolve
9514                      if (! viewGroup.canResolveLayoutDirection()) {
9515                          return;
9516                      }
9517                      if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) {
9518                          mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL;
9519                      }
9520                  }
9521                  break;
9522              case LAYOUT_DIRECTION_RTL:
9523                  mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL;
9524                  break;
9525              case LAYOUT_DIRECTION_LOCALE:
9526                  if(isLayoutDirectionRtl(Locale.getDefault())) {
9527                      mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL;
9528                  }
9529                  break;
9530              default:
9531                  // Nothing to do, LTR by default
9532          }
9533  
9534          // Set to resolved
9535          mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED;
9536      }
9537  
9538      /**
9539       * @hide
9540       */
9541      protected void resolvePadding() {
9542          // If the user specified the absolute padding (either with android:padding or
9543          // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise
9544          // use the default padding or the padding from the background drawable
9545          // (stored at this point in mPadding*)
9546          switch (getResolvedLayoutDirection()) {
9547              case LAYOUT_DIRECTION_RTL:
9548                  // Start user padding override Right user padding. Otherwise, if Right user
9549                  // padding is not defined, use the default Right padding. If Right user padding
9550                  // is defined, just use it.
9551                  if (mUserPaddingStart >= 0) {
9552                      mUserPaddingRight = mUserPaddingStart;
9553                  } else if (mUserPaddingRight < 0) {
9554                      mUserPaddingRight = mPaddingRight;
9555                  }
9556                  if (mUserPaddingEnd >= 0) {
9557                      mUserPaddingLeft = mUserPaddingEnd;
9558                  } else if (mUserPaddingLeft < 0) {
9559                      mUserPaddingLeft = mPaddingLeft;
9560                  }
9561                  break;
9562              case LAYOUT_DIRECTION_LTR:
9563              default:
9564                  // Start user padding override Left user padding. Otherwise, if Left user
9565                  // padding is not defined, use the default left padding. If Left user padding
9566                  // is defined, just use it.
9567                  if (mUserPaddingStart >= 0) {
9568                      mUserPaddingLeft = mUserPaddingStart;
9569                  } else if (mUserPaddingLeft < 0) {
9570                      mUserPaddingLeft = mPaddingLeft;
9571                  }
9572                  if (mUserPaddingEnd >= 0) {
9573                      mUserPaddingRight = mUserPaddingEnd;
9574                  } else if (mUserPaddingRight < 0) {
9575                      mUserPaddingRight = mPaddingRight;
9576                  }
9577          }
9578  
9579          mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom;
9580  
9581          recomputePadding();
9582      }
9583  
9584      /**
9585       * Return true if layout direction resolution can be done
9586       *
9587       * @hide
9588       */
9589      protected boolean canResolveLayoutDirection() {
9590          switch (getLayoutDirection()) {
9591              case LAYOUT_DIRECTION_INHERIT:
9592                  return (mParent != null);
9593              default:
9594                  return true;
9595          }
9596      }
9597  
9598      /**
9599       * Reset the resolved layout direction.
9600       *
9601       * Subclasses need to override this method to clear cached information that depends on the
9602       * resolved layout direction, or to inform child views that inherit their layout direction.
9603       * Overrides must also call the superclass implementation at the start of their implementation.
9604       *
9605       * @hide
9606       */
9607      protected void resetResolvedLayoutDirection() {
9608          // Reset the current View resolution
9609          mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED;
9610      }
9611  
9612      /**
9613       * Check if a Locale is corresponding to a RTL script.
9614       *
9615       * @param locale Locale to check
9616       * @return true if a Locale is corresponding to a RTL script.
9617       *
9618       * @hide
9619       */
9620      protected static boolean isLayoutDirectionRtl(Locale locale) {
9621          return (LocaleUtil.TEXT_LAYOUT_DIRECTION_RTL_DO_NOT_USE ==
9622                  LocaleUtil.getLayoutDirectionFromLocale(locale));
9623      }
9624  
9625      /**
9626       * This is called when the view is detached from a window.  At this point it
9627       * no longer has a surface for drawing.
9628       *
9629       * @see #onAttachedToWindow()
9630       */
9631      protected void onDetachedFromWindow() {
9632          mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT;
9633  
9634          removeUnsetPressCallback();
9635          removeLongPressCallback();
9636          removePerformClickCallback();
9637          removeSendViewScrolledAccessibilityEventCallback();
9638  
9639          destroyDrawingCache();
9640  
9641          destroyLayer();
9642  
9643          if (mDisplayList != null) {
9644              mDisplayList.invalidate();
9645          }
9646  
9647          if (mAttachInfo != null) {
9648              mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this);
9649          }
9650  
9651          mCurrentAnimation = null;
9652  
9653          resetResolvedLayoutDirection();
9654          resetResolvedTextDirection();
9655      }
9656  
9657      /**
9658       * @return The number of times this view has been attached to a window
9659       */
9660      protected int getWindowAttachCount() {
9661          return mWindowAttachCount;
9662      }
9663  
9664      /**
9665       * Retrieve a unique token identifying the window this view is attached to.
9666       * @return Return the window's token for use in
9667       * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}.
9668       */
9669      public IBinder getWindowToken() {
9670          return mAttachInfo != null ? mAttachInfo.mWindowToken : null;
9671      }
9672  
9673      /**
9674       * Retrieve a unique token identifying the top-level "real" window of
9675       * the window that this view is attached to.  That is, this is like
9676       * {@link #getWindowToken}, except if the window this view in is a panel
9677       * window (attached to another containing window), then the token of
9678       * the containing window is returned instead.
9679       *
9680       * @return Returns the associated window token, either
9681       * {@link #getWindowToken()} or the containing window's token.
9682       */
9683      public IBinder getApplicationWindowToken() {
9684          AttachInfo ai = mAttachInfo;
9685          if (ai != null) {
9686              IBinder appWindowToken = ai.mPanelParentWindowToken;
9687              if (appWindowToken == null) {
9688                  appWindowToken = ai.mWindowToken;
9689              }
9690              return appWindowToken;
9691          }
9692          return null;
9693      }
9694  
9695      /**
9696       * Retrieve private session object this view hierarchy is using to
9697       * communicate with the window manager.
9698       * @return the session object to communicate with the window manager
9699       */
9700      /*package*/ IWindowSession getWindowSession() {
9701          return mAttachInfo != null ? mAttachInfo.mSession : null;
9702      }
9703  
9704      /**
9705       * @param info the {@link android.view.View.AttachInfo} to associated with
9706       *        this view
9707       */
9708      void dispatchAttachedToWindow(AttachInfo info, int visibility) {
9709          //System.out.println("Attached! " + this);
9710          mAttachInfo = info;
9711          mWindowAttachCount++;
9712          // We will need to evaluate the drawable state at least once.
9713          mPrivateFlags |= DRAWABLE_STATE_DIRTY;
9714          if (mFloatingTreeObserver != null) {
9715              info.mTreeObserver.merge(mFloatingTreeObserver);
9716              mFloatingTreeObserver = null;
9717          }
9718          if ((mPrivateFlags&SCROLL_CONTAINER) != 0) {
9719              mAttachInfo.mScrollContainers.add(this);
9720              mPrivateFlags |= SCROLL_CONTAINER_ADDED;
9721          }
9722          performCollectViewAttributes(visibility);
9723          onAttachedToWindow();
9724  
9725          final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners =
9726                  mOnAttachStateChangeListeners;
9727          if (listeners != null && listeners.size() > 0) {
9728              // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to
9729              // perform the dispatching. The iterator is a safe guard against listeners that
9730              // could mutate the list by calling the various add/remove methods. This prevents
9731              // the array from being modified while we iterate it.
9732              for (OnAttachStateChangeListener listener : listeners) {
9733                  listener.onViewAttachedToWindow(this);
9734              }
9735          }
9736  
9737          int vis = info.mWindowVisibility;
9738          if (vis != GONE) {
9739              onWindowVisibilityChanged(vis);
9740          }
9741          if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) {
9742              // If nobody has evaluated the drawable state yet, then do it now.
9743              refreshDrawableState();
9744          }
9745      }
9746  
9747      void dispatchDetachedFromWindow() {
9748          AttachInfo info = mAttachInfo;
9749          if (info != null) {
9750              int vis = info.mWindowVisibility;
9751              if (vis != GONE) {
9752                  onWindowVisibilityChanged(GONE);
9753              }
9754          }
9755  
9756          onDetachedFromWindow();
9757  
9758          final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners =
9759                  mOnAttachStateChangeListeners;
9760          if (listeners != null && listeners.size() > 0) {
9761              // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to
9762              // perform the dispatching. The iterator is a safe guard against listeners that
9763              // could mutate the list by calling the various add/remove methods. This prevents
9764              // the array from being modified while we iterate it.
9765              for (OnAttachStateChangeListener listener : listeners) {
9766                  listener.onViewDetachedFromWindow(this);
9767              }
9768          }
9769  
9770          if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) {
9771              mAttachInfo.mScrollContainers.remove(this);
9772              mPrivateFlags &= ~SCROLL_CONTAINER_ADDED;
9773          }
9774  
9775          mAttachInfo = null;
9776      }
9777  
9778      /**
9779       * Store this view hierarchy's frozen state into the given container.
9780       *
9781       * @param container The SparseArray in which to save the view's state.
9782       *
9783       * @see #restoreHierarchyState(android.util.SparseArray)
9784       * @see #dispatchSaveInstanceState(android.util.SparseArray)
9785       * @see #onSaveInstanceState()
9786       */
9787      public void saveHierarchyState(SparseArray<Parcelable> container) {
9788          dispatchSaveInstanceState(container);
9789      }
9790  
9791      /**
9792       * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for
9793       * this view and its children. May be overridden to modify how freezing happens to a
9794       * view's children; for example, some views may want to not store state for their children.
9795       *
9796       * @param container The SparseArray in which to save the view's state.
9797       *
9798       * @see #dispatchRestoreInstanceState(android.util.SparseArray)
9799       * @see #saveHierarchyState(android.util.SparseArray)
9800       * @see #onSaveInstanceState()
9801       */
9802      protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) {
9803          if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) {
9804              mPrivateFlags &= ~SAVE_STATE_CALLED;
9805              Parcelable state = onSaveInstanceState();
9806              if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) {
9807                  throw new IllegalStateException(
9808                          "Derived class did not call super.onSaveInstanceState()");
9809              }
9810              if (state != null) {
9811                  // Log.i("View", "Freezing #" + Integer.toHexString(mID)
9812                  // + ": " + state);
9813                  container.put(mID, state);
9814              }
9815          }
9816      }
9817  
9818      /**
9819       * Hook allowing a view to generate a representation of its internal state
9820       * that can later be used to create a new instance with that same state.
9821       * This state should only contain information that is not persistent or can
9822       * not be reconstructed later. For example, you will never store your
9823       * current position on screen because that will be computed again when a
9824       * new instance of the view is placed in its view hierarchy.
9825       * <p>
9826       * Some examples of things you may store here: the current cursor position
9827       * in a text view (but usually not the text itself since that is stored in a
9828       * content provider or other persistent storage), the currently selected
9829       * item in a list view.
9830       *
9831       * @return Returns a Parcelable object containing the view's current dynamic
9832       *         state, or null if there is nothing interesting to save. The
9833       *         default implementation returns null.
9834       * @see #onRestoreInstanceState(android.os.Parcelable)
9835       * @see #saveHierarchyState(android.util.SparseArray)
9836       * @see #dispatchSaveInstanceState(android.util.SparseArray)
9837       * @see #setSaveEnabled(boolean)
9838       */
9839      protected Parcelable onSaveInstanceState() {
9840          mPrivateFlags |= SAVE_STATE_CALLED;
9841          return BaseSavedState.EMPTY_STATE;
9842      }
9843  
9844      /**
9845       * Restore this view hierarchy's frozen state from the given container.
9846       *
9847       * @param container The SparseArray which holds previously frozen states.
9848       *
9849       * @see #saveHierarchyState(android.util.SparseArray)
9850       * @see #dispatchRestoreInstanceState(android.util.SparseArray)
9851       * @see #onRestoreInstanceState(android.os.Parcelable)
9852       */
9853      public void restoreHierarchyState(SparseArray<Parcelable> container) {
9854          dispatchRestoreInstanceState(container);
9855      }
9856  
9857      /**
9858       * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the
9859       * state for this view and its children. May be overridden to modify how restoring
9860       * happens to a view's children; for example, some views may want to not store state
9861       * for their children.
9862       *
9863       * @param container The SparseArray which holds previously saved state.
9864       *
9865       * @see #dispatchSaveInstanceState(android.util.SparseArray)
9866       * @see #restoreHierarchyState(android.util.SparseArray)
9867       * @see #onRestoreInstanceState(android.os.Parcelable)
9868       */
9869      protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
9870          if (mID != NO_ID) {
9871              Parcelable state = container.get(mID);
9872              if (state != null) {
9873                  // Log.i("View", "Restoreing #" + Integer.toHexString(mID)
9874                  // + ": " + state);
9875                  mPrivateFlags &= ~SAVE_STATE_CALLED;
9876                  onRestoreInstanceState(state);
9877                  if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) {
9878                      throw new IllegalStateException(
9879                              "Derived class did not call super.onRestoreInstanceState()");
9880                  }
9881              }
9882          }
9883      }
9884  
9885      /**
9886       * Hook allowing a view to re-apply a representation of its internal state that had previously
9887       * been generated by {@link #onSaveInstanceState}. This function will never be called with a
9888       * null state.
9889       *
9890       * @param state The frozen state that had previously been returned by
9891       *        {@link #onSaveInstanceState}.
9892       *
9893       * @see #onSaveInstanceState()
9894       * @see #restoreHierarchyState(android.util.SparseArray)
9895       * @see #dispatchRestoreInstanceState(android.util.SparseArray)
9896       */
9897      protected void onRestoreInstanceState(Parcelable state) {
9898          mPrivateFlags |= SAVE_STATE_CALLED;
9899          if (state != BaseSavedState.EMPTY_STATE && state != null) {
9900              throw new IllegalArgumentException("Wrong state class, expecting View State but "
9901                      + "received " + state.getClass().toString() + " instead. This usually happens "
9902                      + "when two views of different type have the same id in the same hierarchy. "
9903                      + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure "
9904                      + "other views do not use the same id.");
9905          }
9906      }
9907  
9908      /**
9909       * <p>Return the time at which the drawing of the view hierarchy started.</p>
9910       *
9911       * @return the drawing start time in milliseconds
9912       */
9913      public long getDrawingTime() {
9914          return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0;
9915      }
9916  
9917      /**
9918       * <p>Enables or disables the duplication of the parent's state into this view. When
9919       * duplication is enabled, this view gets its drawable state from its parent rather
9920       * than from its own internal properties.</p>
9921       *
9922       * <p>Note: in the current implementation, setting this property to true after the
9923       * view was added to a ViewGroup might have no effect at all. This property should
9924       * always be used from XML or set to true before adding this view to a ViewGroup.</p>
9925       *
9926       * <p>Note: if this view's parent addStateFromChildren property is enabled and this
9927       * property is enabled, an exception will be thrown.</p>
9928       *
9929       * <p>Note: if the child view uses and updates additionnal states which are unknown to the
9930       * parent, these states should not be affected by this method.</p>
9931       *
9932       * @param enabled True to enable duplication of the parent's drawable state, false
9933       *                to disable it.
9934       *
9935       * @see #getDrawableState()
9936       * @see #isDuplicateParentStateEnabled()
9937       */
9938      public void setDuplicateParentStateEnabled(boolean enabled) {
9939          setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE);
9940      }
9941  
9942      /**
9943       * <p>Indicates whether this duplicates its drawable state from its parent.</p>
9944       *
9945       * @return True if this view's drawable state is duplicated from the parent,
9946       *         false otherwise
9947       *
9948       * @see #getDrawableState()
9949       * @see #setDuplicateParentStateEnabled(boolean)
9950       */
9951      public boolean isDuplicateParentStateEnabled() {
9952          return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE;
9953      }
9954  
9955      /**
9956       * <p>Specifies the type of layer backing this view. The layer can be
9957       * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or
9958       * {@link #LAYER_TYPE_HARDWARE hardware}.</p>
9959       *
9960       * <p>A layer is associated with an optional {@link android.graphics.Paint}
9961       * instance that controls how the layer is composed on screen. The following
9962       * properties of the paint are taken into account when composing the layer:</p>
9963       * <ul>
9964       * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li>
9965       * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li>
9966       * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li>
9967       * </ul>
9968       *
9969       * <p>If this view has an alpha value set to < 1.0 by calling
9970       * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by
9971       * this view's alpha value. Calling {@link #setAlpha(float)} is therefore
9972       * equivalent to setting a hardware layer on this view and providing a paint with
9973       * the desired alpha value.<p>
9974       *
9975       * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled},
9976       * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware}
9977       * for more information on when and how to use layers.</p>
9978       *
9979       * @param layerType The ype of layer to use with this view, must be one of
9980       *        {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
9981       *        {@link #LAYER_TYPE_HARDWARE}
9982       * @param paint The paint used to compose the layer. This argument is optional
9983       *        and can be null. It is ignored when the layer type is
9984       *        {@link #LAYER_TYPE_NONE}
9985       *
9986       * @see #getLayerType()
9987       * @see #LAYER_TYPE_NONE
9988       * @see #LAYER_TYPE_SOFTWARE
9989       * @see #LAYER_TYPE_HARDWARE
9990       * @see #setAlpha(float)
9991       *
9992       * @attr ref android.R.styleable#View_layerType
9993       */
9994      public void setLayerType(int layerType, Paint paint) {
9995          if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) {
9996              throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, "
9997                      + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE");
9998          }
9999  
10000          if (layerType == mLayerType) {
10001              if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) {
10002                  mLayerPaint = paint == null ? new Paint() : paint;
10003                  invalidateParentCaches();
10004                  invalidate(true);
10005              }
10006              return;
10007          }
10008  
10009          // Destroy any previous software drawing cache if needed
10010          switch (mLayerType) {
10011              case LAYER_TYPE_HARDWARE:
10012                  destroyLayer();
10013                  // fall through - unaccelerated views may use software layer mechanism instead
10014              case LAYER_TYPE_SOFTWARE:
10015                  destroyDrawingCache();
10016                  break;
10017              default:
10018                  break;
10019          }
10020  
10021          mLayerType = layerType;
10022          final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE;
10023          mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint);
10024          mLocalDirtyRect = layerDisabled ? null : new Rect();
10025  
10026          invalidateParentCaches();
10027          invalidate(true);
10028      }
10029  
10030      /**
10031       * Indicates whether this view has a static layer. A view with layer type
10032       * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are
10033       * dynamic.
10034       */
10035      boolean hasStaticLayer() {
10036          return mLayerType == LAYER_TYPE_NONE;
10037      }
10038  
10039      /**
10040       * Indicates what type of layer is currently associated with this view. By default
10041       * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}.
10042       * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)}
10043       * for more information on the different types of layers.
10044       *
10045       * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
10046       *         {@link #LAYER_TYPE_HARDWARE}
10047       *
10048       * @see #setLayerType(int, android.graphics.Paint)
10049       * @see #buildLayer()
10050       * @see #LAYER_TYPE_NONE
10051       * @see #LAYER_TYPE_SOFTWARE
10052       * @see #LAYER_TYPE_HARDWARE
10053       */
10054      public int getLayerType() {
10055          return mLayerType;
10056      }
10057  
10058      /**
10059       * Forces this view's layer to be created and this view to be rendered
10060       * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE},
10061       * invoking this method will have no effect.
10062       *
10063       * This method can for instance be used to render a view into its layer before
10064       * starting an animation. If this view is complex, rendering into the layer
10065       * before starting the animation will avoid skipping frames.
10066       *
10067       * @throws IllegalStateException If this view is not attached to a window
10068       *
10069       * @see #setLayerType(int, android.graphics.Paint)
10070       */
10071      public void buildLayer() {
10072          if (mLayerType == LAYER_TYPE_NONE) return;
10073  
10074          if (mAttachInfo == null) {
10075              throw new IllegalStateException("This view must be attached to a window first");
10076          }
10077  
10078          switch (mLayerType) {
10079              case LAYER_TYPE_HARDWARE:
10080                  getHardwareLayer();
10081                  break;
10082              case LAYER_TYPE_SOFTWARE:
10083                  buildDrawingCache(true);
10084                  break;
10085          }
10086      }
10087  
10088      /**
10089       * <p>Returns a hardware layer that can be used to draw this view again
10090       * without executing its draw method.</p>
10091       *
10092       * @return A HardwareLayer ready to render, or null if an error occurred.
10093       */
10094      HardwareLayer getHardwareLayer() {
10095          if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null ||
10096                  !mAttachInfo.mHardwareRenderer.isEnabled()) {
10097              return null;
10098          }
10099  
10100          final int width = mRight - mLeft;
10101          final int height = mBottom - mTop;
10102  
10103          if (width == 0 || height == 0) {
10104              return null;
10105          }
10106  
10107          if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) {
10108              if (mHardwareLayer == null) {
10109                  mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer(
10110                          width, height, isOpaque());
10111                  mLocalDirtyRect.setEmpty();
10112              } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) {
10113                  mHardwareLayer.resize(width, height);
10114                  mLocalDirtyRect.setEmpty();
10115              }
10116  
10117              HardwareCanvas currentCanvas = mAttachInfo.mHardwareCanvas;
10118              final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas);
10119              mAttachInfo.mHardwareCanvas = canvas;
10120              try {
10121                  canvas.setViewport(width, height);
10122                  canvas.onPreDraw(mLocalDirtyRect);
10123                  mLocalDirtyRect.setEmpty();
10124  
10125                  final int restoreCount = canvas.save();
10126  
10127                  computeScroll();
10128                  canvas.translate(-mScrollX, -mScrollY);
10129  
10130                  mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID;
10131  
10132                  // Fast path for layouts with no backgrounds
10133                  if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) {
10134                      mPrivateFlags &= ~DIRTY_MASK;
10135                      dispatchDraw(canvas);
10136                  } else {
10137                      draw(canvas);
10138                  }
10139  
10140                  canvas.restoreToCount(restoreCount);
10141              } finally {
10142                  canvas.onPostDraw();
10143                  mHardwareLayer.end(currentCanvas);
10144                  mAttachInfo.mHardwareCanvas = currentCanvas;
10145              }
10146          }
10147  
10148          return mHardwareLayer;
10149      }
10150  
10151      /**
10152       * Destroys this View's hardware layer if possible.
10153       *
10154       * @return True if the layer was destroyed, false otherwise.
10155       *
10156       * @see #setLayerType(int, android.graphics.Paint)
10157       * @see #LAYER_TYPE_HARDWARE
10158       */
10159      boolean destroyLayer() {
10160          if (mHardwareLayer != null) {
10161              mHardwareLayer.destroy();
10162              mHardwareLayer = null;
10163              return true;
10164          }
10165          return false;
10166      }
10167  
10168      /**
10169       * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call
10170       * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a
10171       * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when
10172       * the cache is enabled. To benefit from the cache, you must request the drawing cache by
10173       * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not
10174       * null.</p>
10175       *
10176       * <p>Enabling the drawing cache is similar to
10177       * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware
10178       * acceleration is turned off. When hardware acceleration is turned on, enabling the
10179       * drawing cache has no effect on rendering because the system uses a different mechanism
10180       * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even
10181       * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)}
10182       * for information on how to enable software and hardware layers.</p>
10183       *
10184       * <p>This API can be used to manually generate
10185       * a bitmap copy of this view, by setting the flag to <code>true</code> and calling
10186       * {@link #getDrawingCache()}.</p>
10187       *
10188       * @param enabled true to enable the drawing cache, false otherwise
10189       *
10190       * @see #isDrawingCacheEnabled()
10191       * @see #getDrawingCache()
10192       * @see #buildDrawingCache()
10193       * @see #setLayerType(int, android.graphics.Paint)
10194       */
10195      public void setDrawingCacheEnabled(boolean enabled) {
10196          mCachingFailed = false;
10197          setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED);
10198      }
10199  
10200      /**
10201       * <p>Indicates whether the drawing cache is enabled for this view.</p>
10202       *
10203       * @return true if the drawing cache is enabled
10204       *
10205       * @see #setDrawingCacheEnabled(boolean)
10206       * @see #getDrawingCache()
10207       */
10208      @ViewDebug.ExportedProperty(category = "drawing")
10209      public boolean isDrawingCacheEnabled() {
10210          return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED;
10211      }
10212  
10213      /**
10214       * Debugging utility which recursively outputs the dirty state of a view and its
10215       * descendants.
10216       *
10217       * @hide
10218       */
10219      @SuppressWarnings({"UnusedDeclaration"})
10220      public void outputDirtyFlags(String indent, boolean clear, int clearMask) {
10221          Log.d("View", indent + this + "             DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) +
10222                  ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" +
10223                  (mPrivateFlags & View.DRAWING_CACHE_VALID) +
10224                  ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")");
10225          if (clear) {
10226              mPrivateFlags &= clearMask;
10227          }
10228          if (this instanceof ViewGroup) {
10229              ViewGroup parent = (ViewGroup) this;
10230              final int count = parent.getChildCount();
10231              for (int i = 0; i < count; i++) {
10232                  final View child = parent.getChildAt(i);
10233                  child.outputDirtyFlags(indent + "  ", clear, clearMask);
10234              }
10235          }
10236      }
10237  
10238      /**
10239       * This method is used by ViewGroup to cause its children to restore or recreate their
10240       * display lists. It is called by getDisplayList() when the parent ViewGroup does not need
10241       * to recreate its own display list, which would happen if it went through the normal
10242       * draw/dispatchDraw mechanisms.
10243       *
10244       * @hide
10245       */
10246      protected void dispatchGetDisplayList() {}
10247  
10248      /**
10249       * A view that is not attached or hardware accelerated cannot create a display list.
10250       * This method checks these conditions and returns the appropriate result.
10251       *
10252       * @return true if view has the ability to create a display list, false otherwise.
10253       *
10254       * @hide
10255       */
10256      public boolean canHaveDisplayList() {
10257          return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null);
10258      }
10259  
10260      /**
10261       * <p>Returns a display list that can be used to draw this view again
10262       * without executing its draw method.</p>
10263       *
10264       * @return A DisplayList ready to replay, or null if caching is not enabled.
10265       *
10266       * @hide
10267       */
10268      public DisplayList getDisplayList() {
10269          if (!canHaveDisplayList()) {
10270              return null;
10271          }
10272  
10273          if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 ||
10274                  mDisplayList == null || !mDisplayList.isValid() ||
10275                  mRecreateDisplayList)) {
10276              // Don't need to recreate the display list, just need to tell our
10277              // children to restore/recreate theirs
10278              if (mDisplayList != null && mDisplayList.isValid() &&
10279                      !mRecreateDisplayList) {
10280                  mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID;
10281                  mPrivateFlags &= ~DIRTY_MASK;
10282                  dispatchGetDisplayList();
10283  
10284                  return mDisplayList;
10285              }
10286  
10287              // If we got here, we're recreating it. Mark it as such to ensure that
10288              // we copy in child display lists into ours in drawChild()
10289              mRecreateDisplayList = true;
10290              if (mDisplayList == null) {
10291                  mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList();
10292                  // If we're creating a new display list, make sure our parent gets invalidated
10293                  // since they will need to recreate their display list to account for this
10294                  // new child display list.
10295                  invalidateParentCaches();
10296              }
10297  
10298              final HardwareCanvas canvas = mDisplayList.start();
10299              int restoreCount = 0;
10300              try {
10301                  int width = mRight - mLeft;
10302                  int height = mBottom - mTop;
10303  
10304                  canvas.setViewport(width, height);
10305                  // The dirty rect should always be null for a display list
10306                  canvas.onPreDraw(null);
10307  
10308                  computeScroll();
10309  
10310                  restoreCount = canvas.save();
10311                  canvas.translate(-mScrollX, -mScrollY);
10312                  mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID;
10313                  mPrivateFlags &= ~DIRTY_MASK;
10314  
10315                  // Fast path for layouts with no backgrounds
10316                  if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) {
10317                      dispatchDraw(canvas);
10318                  } else {
10319                      draw(canvas);
10320                  }
10321              } finally {
10322                  canvas.restoreToCount(restoreCount);
10323                  canvas.onPostDraw();
10324  
10325                  mDisplayList.end();
10326              }
10327          } else {
10328              mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID;
10329              mPrivateFlags &= ~DIRTY_MASK;
10330          }
10331  
10332          return mDisplayList;
10333      }
10334  
10335      /**
10336       * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p>
10337       *
10338       * @return A non-scaled bitmap representing this view or null if cache is disabled.
10339       *
10340       * @see #getDrawingCache(boolean)
10341       */
10342      public Bitmap getDrawingCache() {
10343          return getDrawingCache(false);
10344      }
10345  
10346      /**
10347       * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap
10348       * is null when caching is disabled. If caching is enabled and the cache is not ready,
10349       * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not
10350       * draw from the cache when the cache is enabled. To benefit from the cache, you must
10351       * request the drawing cache by calling this method and draw it on screen if the
10352       * returned bitmap is not null.</p>
10353       *
10354       * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled,
10355       * this method will create a bitmap of the same size as this view. Because this bitmap
10356       * will be drawn scaled by the parent ViewGroup, the result on screen might show
10357       * scaling artifacts. To avoid such artifacts, you should call this method by setting
10358       * the auto scaling to true. Doing so, however, will generate a bitmap of a different
10359       * size than the view. This implies that your application must be able to handle this
10360       * size.</p>
10361       *
10362       * @param autoScale Indicates whether the generated bitmap should be scaled based on
10363       *        the current density of the screen when the application is in compatibility
10364       *        mode.
10365       *
10366       * @return A bitmap representing this view or null if cache is disabled.
10367       *
10368       * @see #setDrawingCacheEnabled(boolean)
10369       * @see #isDrawingCacheEnabled()
10370       * @see #buildDrawingCache(boolean)
10371       * @see #destroyDrawingCache()
10372       */
10373      public Bitmap getDrawingCache(boolean autoScale) {
10374          if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) {
10375              return null;
10376          }
10377          if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) {
10378              buildDrawingCache(autoScale);
10379          }
10380          return autoScale ? mDrawingCache : mUnscaledDrawingCache;
10381      }
10382  
10383      /**
10384       * <p>Frees the resources used by the drawing cache. If you call
10385       * {@link #buildDrawingCache()} manually without calling
10386       * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you
10387       * should cleanup the cache with this method afterwards.</p>
10388       *
10389       * @see #setDrawingCacheEnabled(boolean)
10390       * @see #buildDrawingCache()
10391       * @see #getDrawingCache()
10392       */
10393      public void destroyDrawingCache() {
10394          if (mDrawingCache != null) {
10395              mDrawingCache.recycle();
10396              mDrawingCache = null;
10397          }
10398          if (mUnscaledDrawingCache != null) {
10399              mUnscaledDrawingCache.recycle();
10400              mUnscaledDrawingCache = null;
10401          }
10402      }
10403  
10404      /**
10405       * Setting a solid background color for the drawing cache's bitmaps will improve
10406       * performance and memory usage. Note, though that this should only be used if this
10407       * view will always be drawn on top of a solid color.
10408       *
10409       * @param color The background color to use for the drawing cache's bitmap
10410       *
10411       * @see #setDrawingCacheEnabled(boolean)
10412       * @see #buildDrawingCache()
10413       * @see #getDrawingCache()
10414       */
10415      public void setDrawingCacheBackgroundColor(int color) {
10416          if (color != mDrawingCacheBackgroundColor) {
10417              mDrawingCacheBackgroundColor = color;
10418              mPrivateFlags &= ~DRAWING_CACHE_VALID;
10419          }
10420      }
10421  
10422      /**
10423       * @see #setDrawingCacheBackgroundColor(int)
10424       *
10425       * @return The background color to used for the drawing cache's bitmap
10426       */
10427      public int getDrawingCacheBackgroundColor() {
10428          return mDrawingCacheBackgroundColor;
10429      }
10430  
10431      /**
10432       * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p>
10433       *
10434       * @see #buildDrawingCache(boolean)
10435       */
10436      public void buildDrawingCache() {
10437          buildDrawingCache(false);
10438      }
10439  
10440      /**
10441       * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p>
10442       *
10443       * <p>If you call {@link #buildDrawingCache()} manually without calling
10444       * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you
10445       * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p>
10446       *
10447       * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled,
10448       * this method will create a bitmap of the same size as this view. Because this bitmap
10449       * will be drawn scaled by the parent ViewGroup, the result on screen might show
10450       * scaling artifacts. To avoid such artifacts, you should call this method by setting
10451       * the auto scaling to true. Doing so, however, will generate a bitmap of a different
10452       * size than the view. This implies that your application must be able to handle this
10453       * size.</p>
10454       *
10455       * <p>You should avoid calling this method when hardware acceleration is enabled. If
10456       * you do not need the drawing cache bitmap, calling this method will increase memory
10457       * usage and cause the view to be rendered in software once, thus negatively impacting
10458       * performance.</p>
10459       *
10460       * @see #getDrawingCache()
10461       * @see #destroyDrawingCache()
10462       */
10463      public void buildDrawingCache(boolean autoScale) {
10464          if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ?
10465                  mDrawingCache == null : mUnscaledDrawingCache == null)) {
10466              mCachingFailed = false;
10467  
10468              if (ViewDebug.TRACE_HIERARCHY) {
10469                  ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE);
10470              }
10471  
10472              int width = mRight - mLeft;
10473              int height = mBottom - mTop;
10474  
10475              final AttachInfo attachInfo = mAttachInfo;
10476              final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired;
10477  
10478              if (autoScale && scalingRequired) {
10479                  width = (int) ((width * attachInfo.mApplicationScale) + 0.5f);
10480                  height = (int) ((height * attachInfo.mApplicationScale) + 0.5f);
10481              }
10482  
10483              final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor;
10484              final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque();
10485              final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache;
10486  
10487              if (width <= 0 || height <= 0 ||
10488                       // Projected bitmap size in bytes
10489                      (width * height * (opaque && !use32BitCache ? 2 : 4) >
10490                              ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) {
10491                  destroyDrawingCache();
10492                  mCachingFailed = true;
10493                  return;
10494              }
10495  
10496              boolean clear = true;
10497              Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache;
10498  
10499              if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) {
10500                  Bitmap.Config quality;
10501                  if (!opaque) {
10502                      // Never pick ARGB_4444 because it looks awful
10503                      // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case
10504                      switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) {
10505                          case DRAWING_CACHE_QUALITY_AUTO:
10506                              quality = Bitmap.Config.ARGB_8888;
10507                              break;
10508                          case DRAWING_CACHE_QUALITY_LOW:
10509                              quality = Bitmap.Config.ARGB_8888;
10510                              break;
10511                          case DRAWING_CACHE_QUALITY_HIGH:
10512                              quality = Bitmap.Config.ARGB_8888;
10513                              break;
10514                          default:
10515                              quality = Bitmap.Config.ARGB_8888;
10516                              break;
10517                      }
10518                  } else {
10519                      // Optimization for translucent windows
10520                      // If the window is translucent, use a 32 bits bitmap to benefit from memcpy()
10521                      quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
10522                  }
10523  
10524                  // Try to cleanup memory
10525                  if (bitmap != null) bitmap.recycle();
10526  
10527                  try {
10528                      bitmap = Bitmap.createBitmap(width, height, quality);
10529                      bitmap.setDensity(getResources().getDisplayMetrics().densityDpi);
10530                      if (autoScale) {
10531                          mDrawingCache = bitmap;
10532                      } else {
10533                          mUnscaledDrawingCache = bitmap;
10534                      }
10535                      if (opaque && use32BitCache) bitmap.setHasAlpha(false);
10536                  } catch (OutOfMemoryError e) {
10537                      // If there is not enough memory to create the bitmap cache, just
10538                      // ignore the issue as bitmap caches are not required to draw the
10539                      // view hierarchy
10540                      if (autoScale) {
10541                          mDrawingCache = null;
10542                      } else {
10543                          mUnscaledDrawingCache = null;
10544                      }
10545                      mCachingFailed = true;
10546                      return;
10547                  }
10548  
10549                  clear = drawingCacheBackgroundColor != 0;
10550              }
10551  
10552              Canvas canvas;
10553              if (attachInfo != null) {
10554                  canvas = attachInfo.mCanvas;
10555                  if (canvas == null) {
10556                      canvas = new Canvas();
10557                  }
10558                  canvas.setBitmap(bitmap);
10559                  // Temporarily clobber the cached Canvas in case one of our children
10560                  // is also using a drawing cache. Without this, the children would
10561                  // steal the canvas by attaching their own bitmap to it and bad, bad
10562                  // thing would happen (invisible views, corrupted drawings, etc.)
10563                  attachInfo.mCanvas = null;
10564              } else {
10565                  // This case should hopefully never or seldom happen
10566                  canvas = new Canvas(bitmap);
10567              }
10568  
10569              if (clear) {
10570                  bitmap.eraseColor(drawingCacheBackgroundColor);
10571              }
10572  
10573              computeScroll();
10574              final int restoreCount = canvas.save();
10575  
10576              if (autoScale && scalingRequired) {
10577                  final float scale = attachInfo.mApplicationScale;
10578                  canvas.scale(scale, scale);
10579              }
10580  
10581              canvas.translate(-mScrollX, -mScrollY);
10582  
10583              mPrivateFlags |= DRAWN;
10584              if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated ||
10585                      mLayerType != LAYER_TYPE_NONE) {
10586                  mPrivateFlags |= DRAWING_CACHE_VALID;
10587              }
10588  
10589              // Fast path for layouts with no backgrounds
10590              if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) {
10591                  if (ViewDebug.TRACE_HIERARCHY) {
10592                      ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW);
10593                  }
10594                  mPrivateFlags &= ~DIRTY_MASK;
10595                  dispatchDraw(canvas);
10596              } else {
10597                  draw(canvas);
10598              }
10599  
10600              canvas.restoreToCount(restoreCount);
10601              canvas.setBitmap(null);
10602  
10603              if (attachInfo != null) {
10604                  // Restore the cached Canvas for our siblings
10605                  attachInfo.mCanvas = canvas;
10606              }
10607          }
10608      }
10609  
10610      /**
10611       * Create a snapshot of the view into a bitmap.  We should probably make
10612       * some form of this public, but should think about the API.
10613       */
10614      Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) {
10615          int width = mRight - mLeft;
10616          int height = mBottom - mTop;
10617  
10618          final AttachInfo attachInfo = mAttachInfo;
10619          final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f;
10620          width = (int) ((width * scale) + 0.5f);
10621          height = (int) ((height * scale) + 0.5f);
10622  
10623          Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality);
10624          if (bitmap == null) {
10625              throw new OutOfMemoryError();
10626          }
10627  
10628          Resources resources = getResources();
10629          if (resources != null) {
10630              bitmap.setDensity(resources.getDisplayMetrics().densityDpi);
10631          }
10632  
10633          Canvas canvas;
10634          if (attachInfo != null) {
10635              canvas = attachInfo.mCanvas;
10636              if (canvas == null) {
10637                  canvas = new Canvas();
10638              }
10639              canvas.setBitmap(bitmap);
10640              // Temporarily clobber the cached Canvas in case one of our children
10641              // is also using a drawing cache. Without this, the children would
10642              // steal the canvas by attaching their own bitmap to it and bad, bad
10643              // things would happen (invisible views, corrupted drawings, etc.)
10644              attachInfo.mCanvas = null;
10645          } else {
10646              // This case should hopefully never or seldom happen
10647              canvas = new Canvas(bitmap);
10648          }
10649  
10650          if ((backgroundColor & 0xff000000) != 0) {
10651              bitmap.eraseColor(backgroundColor);
10652          }
10653  
10654          computeScroll();
10655          final int restoreCount = canvas.save();
10656          canvas.scale(scale, scale);
10657          canvas.translate(-mScrollX, -mScrollY);
10658  
10659          // Temporarily remove the dirty mask
10660          int flags = mPrivateFlags;
10661          mPrivateFlags &= ~DIRTY_MASK;
10662  
10663          // Fast path for layouts with no backgrounds
10664          if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) {
10665              dispatchDraw(canvas);
10666          } else {
10667              draw(canvas);
10668          }
10669  
10670          mPrivateFlags = flags;
10671  
10672          canvas.restoreToCount(restoreCount);
10673          canvas.setBitmap(null);
10674  
10675          if (attachInfo != null) {
10676              // Restore the cached Canvas for our siblings
10677              attachInfo.mCanvas = canvas;
10678          }
10679  
10680          return bitmap;
10681      }
10682  
10683      /**
10684       * Indicates whether this View is currently in edit mode. A View is usually
10685       * in edit mode when displayed within a developer tool. For instance, if
10686       * this View is being drawn by a visual user interface builder, this method
10687       * should return true.
10688       *
10689       * Subclasses should check the return value of this method to provide
10690       * different behaviors if their normal behavior might interfere with the
10691       * host environment. For instance: the class spawns a thread in its
10692       * constructor, the drawing code relies on device-specific features, etc.
10693       *
10694       * This method is usually checked in the drawing code of custom widgets.
10695       *
10696       * @return True if this View is in edit mode, false otherwise.
10697       */
10698      public boolean isInEditMode() {
10699          return false;
10700      }
10701  
10702      /**
10703       * If the View draws content inside its padding and enables fading edges,
10704       * it needs to support padding offsets. Padding offsets are added to the
10705       * fading edges to extend the length of the fade so that it covers pixels
10706       * drawn inside the padding.
10707       *
10708       * Subclasses of this class should override this method if they need
10709       * to draw content inside the padding.
10710       *
10711       * @return True if padding offset must be applied, false otherwise.
10712       *
10713       * @see #getLeftPaddingOffset()
10714       * @see #getRightPaddingOffset()
10715       * @see #getTopPaddingOffset()
10716       * @see #getBottomPaddingOffset()
10717       *
10718       * @since CURRENT
10719       */
10720      protected boolean isPaddingOffsetRequired() {
10721          return false;
10722      }
10723  
10724      /**
10725       * Amount by which to extend the left fading region. Called only when
10726       * {@link #isPaddingOffsetRequired()} returns true.
10727       *
10728       * @return The left padding offset in pixels.
10729       *
10730       * @see #isPaddingOffsetRequired()
10731       *
10732       * @since CURRENT
10733       */
10734      protected int getLeftPaddingOffset() {
10735          return 0;
10736      }
10737  
10738      /**
10739       * Amount by which to extend the right fading region. Called only when
10740       * {@link #isPaddingOffsetRequired()} returns true.
10741       *
10742       * @return The right padding offset in pixels.
10743       *
10744       * @see #isPaddingOffsetRequired()
10745       *
10746       * @since CURRENT
10747       */
10748      protected int getRightPaddingOffset() {
10749          return 0;
10750      }
10751  
10752      /**
10753       * Amount by which to extend the top fading region. Called only when
10754       * {@link #isPaddingOffsetRequired()} returns true.
10755       *
10756       * @return The top padding offset in pixels.
10757       *
10758       * @see #isPaddingOffsetRequired()
10759       *
10760       * @since CURRENT
10761       */
10762      protected int getTopPaddingOffset() {
10763          return 0;
10764      }
10765  
10766      /**
10767       * Amount by which to extend the bottom fading region. Called only when
10768       * {@link #isPaddingOffsetRequired()} returns true.
10769       *
10770       * @return The bottom padding offset in pixels.
10771       *
10772       * @see #isPaddingOffsetRequired()
10773       *
10774       * @since CURRENT
10775       */
10776      protected int getBottomPaddingOffset() {
10777          return 0;
10778      }
10779  
10780      /**
10781       * @hide
10782       * @param offsetRequired
10783       */
10784      protected int getFadeTop(boolean offsetRequired) {
10785          int top = mPaddingTop;
10786          if (offsetRequired) top += getTopPaddingOffset();
10787          return top;
10788      }
10789  
10790      /**
10791       * @hide
10792       * @param offsetRequired
10793       */
10794      protected int getFadeHeight(boolean offsetRequired) {
10795          int padding = mPaddingTop;
10796          if (offsetRequired) padding += getTopPaddingOffset();
10797          return mBottom - mTop - mPaddingBottom - padding;
10798      }
10799  
10800      /**
10801       * <p>Indicates whether this view is attached to an hardware accelerated
10802       * window or not.</p>
10803       *
10804       * <p>Even if this method returns true, it does not mean that every call
10805       * to {@link #draw(android.graphics.Canvas)} will be made with an hardware
10806       * accelerated {@link android.graphics.Canvas}. For instance, if this view
10807       * is drawn onto an offscren {@link android.graphics.Bitmap} and its
10808       * window is hardware accelerated,
10809       * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely
10810       * return false, and this method will return true.</p>
10811       *
10812       * @return True if the view is attached to a window and the window is
10813       *         hardware accelerated; false in any other case.
10814       */
10815      public boolean isHardwareAccelerated() {
10816          return mAttachInfo != null && mAttachInfo.mHardwareAccelerated;
10817      }
10818  
10819      /**
10820       * Manually render this view (and all of its children) to the given Canvas.
10821       * The view must have already done a full layout before this function is
10822       * called.  When implementing a view, implement
10823       * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method.
10824       * If you do need to override this method, call the superclass version.
10825       *
10826       * @param canvas The Canvas to which the View is rendered.
10827       */
10828      public void draw(Canvas canvas) {
10829          if (ViewDebug.TRACE_HIERARCHY) {
10830              ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW);
10831          }
10832  
10833          final int privateFlags = mPrivateFlags;
10834          final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE &&
10835                  (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState);
10836          mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN;
10837  
10838          /*
10839           * Draw traversal performs several drawing steps which must be executed
10840           * in the appropriate order:
10841           *
10842           *      1. Draw the background
10843           *      2. If necessary, save the canvas' layers to prepare for fading
10844           *      3. Draw view's content
10845           *      4. Draw children
10846           *      5. If necessary, draw the fading edges and restore layers
10847           *      6. Draw decorations (scrollbars for instance)
10848           */
10849  
10850          // Step 1, draw the background, if needed
10851          int saveCount;
10852  
10853          if (!dirtyOpaque) {
10854              final Drawable background = mBGDrawable;
10855              if (background != null) {
10856                  final int scrollX = mScrollX;
10857                  final int scrollY = mScrollY;
10858  
10859                  if (mBackgroundSizeChanged) {
10860                      background.setBounds(0, 0,  mRight - mLeft, mBottom - mTop);
10861                      mBackgroundSizeChanged = false;
10862                  }
10863  
10864                  if ((scrollX | scrollY) == 0) {
10865                      background.draw(canvas);
10866                  } else {
10867                      canvas.translate(scrollX, scrollY);
10868                      background.draw(canvas);
10869                      canvas.translate(-scrollX, -scrollY);
10870                  }
10871              }
10872          }
10873  
10874          // skip step 2 & 5 if possible (common case)
10875          final int viewFlags = mViewFlags;
10876          boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0;
10877          boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0;
10878          if (!verticalEdges && !horizontalEdges) {
10879              // Step 3, draw the content
10880              if (!dirtyOpaque) onDraw(canvas);
10881  
10882              // Step 4, draw the children
10883              dispatchDraw(canvas);
10884  
10885              // Step 6, draw decorations (scrollbars)
10886              onDrawScrollBars(canvas);
10887  
10888              // we're done...
10889              return;
10890          }
10891  
10892          /*
10893           * Here we do the full fledged routine...
10894           * (this is an uncommon case where speed matters less,
10895           * this is why we repeat some of the tests that have been
10896           * done above)
10897           */
10898  
10899          boolean drawTop = false;
10900          boolean drawBottom = false;
10901          boolean drawLeft = false;
10902          boolean drawRight = false;
10903  
10904          float topFadeStrength = 0.0f;
10905          float bottomFadeStrength = 0.0f;
10906          float leftFadeStrength = 0.0f;
10907          float rightFadeStrength = 0.0f;
10908  
10909          // Step 2, save the canvas' layers
10910          int paddingLeft = mPaddingLeft;
10911  
10912          final boolean offsetRequired = isPaddingOffsetRequired();
10913          if (offsetRequired) {
10914              paddingLeft += getLeftPaddingOffset();
10915          }
10916  
10917          int left = mScrollX + paddingLeft;
10918          int right = left + mRight - mLeft - mPaddingRight - paddingLeft;
10919          int top = mScrollY + getFadeTop(offsetRequired);
10920          int bottom = top + getFadeHeight(offsetRequired);
10921  
10922          if (offsetRequired) {
10923              right += getRightPaddingOffset();
10924              bottom += getBottomPaddingOffset();
10925          }
10926  
10927          final ScrollabilityCache scrollabilityCache = mScrollCache;
10928          final float fadeHeight = scrollabilityCache.fadingEdgeLength;
10929          int length = (int) fadeHeight;
10930  
10931          // clip the fade length if top and bottom fades overlap
10932          // overlapping fades produce odd-looking artifacts
10933          if (verticalEdges && (top + length > bottom - length)) {
10934              length = (bottom - top) / 2;
10935          }
10936  
10937          // also clip horizontal fades if necessary
10938          if (horizontalEdges && (left + length > right - length)) {
10939              length = (right - left) / 2;
10940          }
10941  
10942          if (verticalEdges) {
10943              topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength()));
10944              drawTop = topFadeStrength * fadeHeight > 1.0f;
10945              bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength()));
10946              drawBottom = bottomFadeStrength * fadeHeight > 1.0f;
10947          }
10948  
10949          if (horizontalEdges) {
10950              leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength()));
10951              drawLeft = leftFadeStrength * fadeHeight > 1.0f;
10952              rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength()));
10953              drawRight = rightFadeStrength * fadeHeight > 1.0f;
10954          }
10955  
10956          saveCount = canvas.getSaveCount();
10957  
10958          int solidColor = getSolidColor();
10959          if (solidColor == 0) {
10960              final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG;
10961  
10962              if (drawTop) {
10963                  canvas.saveLayer(left, top, right, top + length, null, flags);
10964              }
10965  
10966              if (drawBottom) {
10967                  canvas.saveLayer(left, bottom - length, right, bottom, null, flags);
10968              }
10969  
10970              if (drawLeft) {
10971                  canvas.saveLayer(left, top, left + length, bottom, null, flags);
10972              }
10973  
10974              if (drawRight) {
10975                  canvas.saveLayer(right - length, top, right, bottom, null, flags);
10976              }
10977          } else {
10978              scrollabilityCache.setFadeColor(solidColor);
10979          }
10980  
10981          // Step 3, draw the content
10982          if (!dirtyOpaque) onDraw(canvas);
10983  
10984          // Step 4, draw the children
10985          dispatchDraw(canvas);
10986  
10987          // Step 5, draw the fade effect and restore layers
10988          final Paint p = scrollabilityCache.paint;
10989          final Matrix matrix = scrollabilityCache.matrix;
10990          final Shader fade = scrollabilityCache.shader;
10991  
10992          if (drawTop) {
10993              matrix.setScale(1, fadeHeight * topFadeStrength);
10994              matrix.postTranslate(left, top);
10995              fade.setLocalMatrix(matrix);
10996              canvas.drawRect(left, top, right, top + length, p);
10997          }
10998  
10999          if (drawBottom) {
11000              matrix.setScale(1, fadeHeight * bottomFadeStrength);
11001              matrix.postRotate(180);
11002              matrix.postTranslate(left, bottom);
11003              fade.setLocalMatrix(matrix);
11004              canvas.drawRect(left, bottom - length, right, bottom, p);
11005          }
11006  
11007          if (drawLeft) {
11008              matrix.setScale(1, fadeHeight * leftFadeStrength);
11009              matrix.postRotate(-90);
11010              matrix.postTranslate(left, top);
11011              fade.setLocalMatrix(matrix);
11012              canvas.drawRect(left, top, left + length, bottom, p);
11013          }
11014  
11015          if (drawRight) {
11016              matrix.setScale(1, fadeHeight * rightFadeStrength);
11017              matrix.postRotate(90);
11018              matrix.postTranslate(right, top);
11019              fade.setLocalMatrix(matrix);
11020              canvas.drawRect(right - length, top, right, bottom, p);
11021          }
11022  
11023          canvas.restoreToCount(saveCount);
11024  
11025          // Step 6, draw decorations (scrollbars)
11026          onDrawScrollBars(canvas);
11027      }
11028  
11029      /**
11030       * Override this if your view is known to always be drawn on top of a solid color background,
11031       * and needs to draw fading edges. Returning a non-zero color enables the view system to
11032       * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha
11033       * should be set to 0xFF.
11034       *
11035       * @see #setVerticalFadingEdgeEnabled(boolean)
11036       * @see #setHorizontalFadingEdgeEnabled(boolean)
11037       *
11038       * @return The known solid color background for this view, or 0 if the color may vary
11039       */
11040      @ViewDebug.ExportedProperty(category = "drawing")
11041      public int getSolidColor() {
11042          return 0;
11043      }
11044  
11045      /**
11046       * Build a human readable string representation of the specified view flags.
11047       *
11048       * @param flags the view flags to convert to a string
11049       * @return a String representing the supplied flags
11050       */
11051      private static String printFlags(int flags) {
11052          String output = "";
11053          int numFlags = 0;
11054          if ((flags & FOCUSABLE_MASK) == FOCUSABLE) {
11055              output += "TAKES_FOCUS";
11056              numFlags++;
11057          }
11058  
11059          switch (flags & VISIBILITY_MASK) {
11060          case INVISIBLE:
11061              if (numFlags > 0) {
11062                  output += " ";
11063              }
11064              output += "INVISIBLE";
11065              // USELESS HERE numFlags++;
11066              break;
11067          case GONE:
11068              if (numFlags > 0) {
11069                  output += " ";
11070              }
11071              output += "GONE";
11072              // USELESS HERE numFlags++;
11073              break;
11074          default:
11075              break;
11076          }
11077          return output;
11078      }
11079  
11080      /**
11081       * Build a human readable string representation of the specified private
11082       * view flags.
11083       *
11084       * @param privateFlags the private view flags to convert to a string
11085       * @return a String representing the supplied flags
11086       */
11087      private static String printPrivateFlags(int privateFlags) {
11088          String output = "";
11089          int numFlags = 0;
11090  
11091          if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) {
11092              output += "WANTS_FOCUS";
11093              numFlags++;
11094          }
11095  
11096          if ((privateFlags & FOCUSED) == FOCUSED) {
11097              if (numFlags > 0) {
11098                  output += " ";
11099              }
11100              output += "FOCUSED";
11101              numFlags++;
11102          }
11103  
11104          if ((privateFlags & SELECTED) == SELECTED) {
11105              if (numFlags > 0) {
11106                  output += " ";
11107              }
11108              output += "SELECTED";
11109              numFlags++;
11110          }
11111  
11112          if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) {
11113              if (numFlags > 0) {
11114                  output += " ";
11115              }
11116              output += "IS_ROOT_NAMESPACE";
11117              numFlags++;
11118          }
11119  
11120          if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) {
11121              if (numFlags > 0) {
11122                  output += " ";
11123              }
11124              output += "HAS_BOUNDS";
11125              numFlags++;
11126          }
11127  
11128          if ((privateFlags & DRAWN) == DRAWN) {
11129              if (numFlags > 0) {
11130                  output += " ";
11131              }
11132              output += "DRAWN";
11133              // USELESS HERE numFlags++;
11134          }
11135          return output;
11136      }
11137  
11138      /**
11139       * <p>Indicates whether or not this view's layout will be requested during
11140       * the next hierarchy layout pass.</p>
11141       *
11142       * @return true if the layout will be forced during next layout pass
11143       */
11144      public boolean isLayoutRequested() {
11145          return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT;
11146      }
11147  
11148      /**
11149       * Assign a size and position to a view and all of its
11150       * descendants
11151       *
11152       * <p>This is the second phase of the layout mechanism.
11153       * (The first is measuring). In this phase, each parent calls
11154       * layout on all of its children to position them.
11155       * This is typically done using the child measurements
11156       * that were stored in the measure pass().</p>
11157       *
11158       * <p>Derived classes should not override this method.
11159       * Derived classes with children should override
11160       * onLayout. In that method, they should
11161       * call layout on each of their children.</p>
11162       *
11163       * @param l Left position, relative to parent
11164       * @param t Top position, relative to parent
11165       * @param r Right position, relative to parent
11166       * @param b Bottom position, relative to parent
11167       */
11168      @SuppressWarnings({"unchecked"})
11169      public void layout(int l, int t, int r, int b) {
11170          int oldL = mLeft;
11171          int oldT = mTop;
11172          int oldB = mBottom;
11173          int oldR = mRight;
11174          boolean changed = setFrame(l, t, r, b);
11175          if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) {
11176              if (ViewDebug.TRACE_HIERARCHY) {
11177                  ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT);
11178              }
11179  
11180              onLayout(changed, l, t, r, b);
11181              mPrivateFlags &= ~LAYOUT_REQUIRED;
11182  
11183              if (mOnLayoutChangeListeners != null) {
11184                  ArrayList<OnLayoutChangeListener> listenersCopy =
11185                          (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone();
11186                  int numListeners = listenersCopy.size();
11187                  for (int i = 0; i < numListeners; ++i) {
11188                      listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB);
11189                  }
11190              }
11191          }
11192          mPrivateFlags &= ~FORCE_LAYOUT;
11193      }
11194  
11195      /**
11196       * Called from layout when this view should
11197       * assign a size and position to each of its children.
11198       *
11199       * Derived classes with children should override
11200       * this method and call layout on each of
11201       * their children.
11202       * @param changed This is a new size or position for this view
11203       * @param left Left position, relative to parent
11204       * @param top Top position, relative to parent
11205       * @param right Right position, relative to parent
11206       * @param bottom Bottom position, relative to parent
11207       */
11208      protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
11209      }
11210  
11211      /**
11212       * Assign a size and position to this view.
11213       *
11214       * This is called from layout.
11215       *
11216       * @param left Left position, relative to parent
11217       * @param top Top position, relative to parent
11218       * @param right Right position, relative to parent
11219       * @param bottom Bottom position, relative to parent
11220       * @return true if the new size and position are different than the
11221       *         previous ones
11222       * {@hide}
11223       */
11224      protected boolean setFrame(int left, int top, int right, int bottom) {
11225          boolean changed = false;
11226  
11227          if (DBG) {
11228              Log.d("View", this + " View.setFrame(" + left + "," + top + ","
11229                      + right + "," + bottom + ")");
11230          }
11231  
11232          if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) {
11233              changed = true;
11234  
11235              // Remember our drawn bit
11236              int drawn = mPrivateFlags & DRAWN;
11237  
11238              int oldWidth = mRight - mLeft;
11239              int oldHeight = mBottom - mTop;
11240              int newWidth = right - left;
11241              int newHeight = bottom - top;
11242              boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight);
11243  
11244              // Invalidate our old position
11245              invalidate(sizeChanged);
11246  
11247              mLeft = left;
11248              mTop = top;
11249              mRight = right;
11250              mBottom = bottom;
11251  
11252              mPrivateFlags |= HAS_BOUNDS;
11253  
11254  
11255              if (sizeChanged) {
11256                  if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) {
11257                      // A change in dimension means an auto-centered pivot point changes, too
11258                      if (mTransformationInfo != null) {
11259                          mTransformationInfo.mMatrixDirty = true;
11260                      }
11261                  }
11262                  onSizeChanged(newWidth, newHeight, oldWidth, oldHeight);
11263              }
11264  
11265              if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) {
11266                  // If we are visible, force the DRAWN bit to on so that
11267                  // this invalidate will go through (at least to our parent).
11268                  // This is because someone may have invalidated this view
11269                  // before this call to setFrame came in, thereby clearing
11270                  // the DRAWN bit.
11271                  mPrivateFlags |= DRAWN;
11272                  invalidate(sizeChanged);
11273                  // parent display list may need to be recreated based on a change in the bounds
11274                  // of any child
11275                  invalidateParentCaches();
11276              }
11277  
11278              // Reset drawn bit to original value (invalidate turns it off)
11279              mPrivateFlags |= drawn;
11280  
11281              mBackgroundSizeChanged = true;
11282          }
11283          return changed;
11284      }
11285  
11286      /**
11287       * Finalize inflating a view from XML.  This is called as the last phase
11288       * of inflation, after all child views have been added.
11289       *
11290       * <p>Even if the subclass overrides onFinishInflate, they should always be
11291       * sure to call the super method, so that we get called.
11292       */
11293      protected void onFinishInflate() {
11294      }
11295  
11296      /**
11297       * Returns the resources associated with this view.
11298       *
11299       * @return Resources object.
11300       */
11301      public Resources getResources() {
11302          return mResources;
11303      }
11304  
11305      /**
11306       * Invalidates the specified Drawable.
11307       *
11308       * @param drawable the drawable to invalidate
11309       */
11310      public void invalidateDrawable(Drawable drawable) {
11311          if (verifyDrawable(drawable)) {
11312              final Rect dirty = drawable.getBounds();
11313              final int scrollX = mScrollX;
11314              final int scrollY = mScrollY;
11315  
11316              invalidate(dirty.left + scrollX, dirty.top + scrollY,
11317                      dirty.right + scrollX, dirty.bottom + scrollY);
11318          }
11319      }
11320  
11321      /**
11322       * Schedules an action on a drawable to occur at a specified time.
11323       *
11324       * @param who the recipient of the action
11325       * @param what the action to run on the drawable
11326       * @param when the time at which the action must occur. Uses the
11327       *        {@link SystemClock#uptimeMillis} timebase.
11328       */
11329      public void scheduleDrawable(Drawable who, Runnable what, long when) {
11330          if (verifyDrawable(who) && what != null && mAttachInfo != null) {
11331              mAttachInfo.mHandler.postAtTime(what, who, when);
11332          }
11333      }
11334  
11335      /**
11336       * Cancels a scheduled action on a drawable.
11337       *
11338       * @param who the recipient of the action
11339       * @param what the action to cancel
11340       */
11341      public void unscheduleDrawable(Drawable who, Runnable what) {
11342          if (verifyDrawable(who) && what != null && mAttachInfo != null) {
11343              mAttachInfo.mHandler.removeCallbacks(what, who);
11344          }
11345      }
11346  
11347      /**
11348       * Unschedule any events associated with the given Drawable.  This can be
11349       * used when selecting a new Drawable into a view, so that the previous
11350       * one is completely unscheduled.
11351       *
11352       * @param who The Drawable to unschedule.
11353       *
11354       * @see #drawableStateChanged
11355       */
11356      public void unscheduleDrawable(Drawable who) {
11357          if (mAttachInfo != null) {
11358              mAttachInfo.mHandler.removeCallbacksAndMessages(who);
11359          }
11360      }
11361  
11362      /**
11363      * Return the layout direction of a given Drawable.
11364      *
11365      * @param who the Drawable to query
11366      *
11367      * @hide
11368      */
11369      public int getResolvedLayoutDirection(Drawable who) {
11370          return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT;
11371      }
11372  
11373      /**
11374       * If your view subclass is displaying its own Drawable objects, it should
11375       * override this function and return true for any Drawable it is
11376       * displaying.  This allows animations for those drawables to be
11377       * scheduled.
11378       *
11379       * <p>Be sure to call through to the super class when overriding this
11380       * function.
11381       *
11382       * @param who The Drawable to verify.  Return true if it is one you are
11383       *            displaying, else return the result of calling through to the
11384       *            super class.
11385       *
11386       * @return boolean If true than the Drawable is being displayed in the
11387       *         view; else false and it is not allowed to animate.
11388       *
11389       * @see #unscheduleDrawable(android.graphics.drawable.Drawable)
11390       * @see #drawableStateChanged()
11391       */
11392      protected boolean verifyDrawable(Drawable who) {
11393          return who == mBGDrawable;
11394      }
11395  
11396      /**
11397       * This function is called whenever the state of the view changes in such
11398       * a way that it impacts the state of drawables being shown.
11399       *
11400       * <p>Be sure to call through to the superclass when overriding this
11401       * function.
11402       *
11403       * @see Drawable#setState(int[])
11404       */
11405      protected void drawableStateChanged() {
11406          Drawable d = mBGDrawable;
11407          if (d != null && d.isStateful()) {
11408              d.setState(getDrawableState());
11409          }
11410      }
11411  
11412      /**
11413       * Call this to force a view to update its drawable state. This will cause
11414       * drawableStateChanged to be called on this view. Views that are interested
11415       * in the new state should call getDrawableState.
11416       *
11417       * @see #drawableStateChanged
11418       * @see #getDrawableState
11419       */
11420      public void refreshDrawableState() {
11421          mPrivateFlags |= DRAWABLE_STATE_DIRTY;
11422          drawableStateChanged();
11423  
11424          ViewParent parent = mParent;
11425          if (parent != null) {
11426              parent.childDrawableStateChanged(this);
11427          }
11428      }
11429  
11430      /**
11431       * Return an array of resource IDs of the drawable states representing the
11432       * current state of the view.
11433       *
11434       * @return The current drawable state
11435       *
11436       * @see Drawable#setState(int[])
11437       * @see #drawableStateChanged()
11438       * @see #onCreateDrawableState(int)
11439       */
11440      public final int[] getDrawableState() {
11441          if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) {
11442              return mDrawableState;
11443          } else {
11444              mDrawableState = onCreateDrawableState(0);
11445              mPrivateFlags &= ~DRAWABLE_STATE_DIRTY;
11446              return mDrawableState;
11447          }
11448      }
11449  
11450      /**
11451       * Generate the new {@link android.graphics.drawable.Drawable} state for
11452       * this view. This is called by the view
11453       * system when the cached Drawable state is determined to be invalid.  To
11454       * retrieve the current state, you should use {@link #getDrawableState}.
11455       *
11456       * @param extraSpace if non-zero, this is the number of extra entries you
11457       * would like in the returned array in which you can place your own
11458       * states.
11459       *
11460       * @return Returns an array holding the current {@link Drawable} state of
11461       * the view.
11462       *
11463       * @see #mergeDrawableStates(int[], int[])
11464       */
11465      protected int[] onCreateDrawableState(int extraSpace) {
11466          if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE &&
11467                  mParent instanceof View) {
11468              return ((View) mParent).onCreateDrawableState(extraSpace);
11469          }
11470  
11471          int[] drawableState;
11472  
11473          int privateFlags = mPrivateFlags;
11474  
11475          int viewStateIndex = 0;
11476          if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED;
11477          if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED;
11478          if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED;
11479          if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED;
11480          if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED;
11481          if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED;
11482          if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested &&
11483                  HardwareRenderer.isAvailable()) {
11484              // This is set if HW acceleration is requested, even if the current
11485              // process doesn't allow it.  This is just to allow app preview
11486              // windows to better match their app.
11487              viewStateIndex |= VIEW_STATE_ACCELERATED;
11488          }
11489          if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED;
11490  
11491          final int privateFlags2 = mPrivateFlags2;
11492          if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT;
11493          if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED;
11494  
11495          drawableState = VIEW_STATE_SETS[viewStateIndex];
11496  
11497          //noinspection ConstantIfStatement
11498          if (false) {
11499              Log.i("View", "drawableStateIndex=" + viewStateIndex);
11500              Log.i("View", toString()
11501                      + " pressed=" + ((privateFlags & PRESSED) != 0)
11502                      + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED)
11503                      + " fo=" + hasFocus()
11504                      + " sl=" + ((privateFlags & SELECTED) != 0)
11505                      + " wf=" + hasWindowFocus()
11506                      + ": " + Arrays.toString(drawableState));
11507          }
11508  
11509          if (extraSpace == 0) {
11510              return drawableState;
11511          }
11512  
11513          final int[] fullState;
11514          if (drawableState != null) {
11515              fullState = new int[drawableState.length + extraSpace];
11516              System.arraycopy(drawableState, 0, fullState, 0, drawableState.length);
11517          } else {
11518              fullState = new int[extraSpace];
11519          }
11520  
11521          return fullState;
11522      }
11523  
11524      /**
11525       * Merge your own state values in <var>additionalState</var> into the base
11526       * state values <var>baseState</var> that were returned by
11527       * {@link #onCreateDrawableState(int)}.
11528       *
11529       * @param baseState The base state values returned by
11530       * {@link #onCreateDrawableState(int)}, which will be modified to also hold your
11531       * own additional state values.
11532       *
11533       * @param additionalState The additional state values you would like
11534       * added to <var>baseState</var>; this array is not modified.
11535       *
11536       * @return As a convenience, the <var>baseState</var> array you originally
11537       * passed into the function is returned.
11538       *
11539       * @see #onCreateDrawableState(int)
11540       */
11541      protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) {
11542          final int N = baseState.length;
11543          int i = N - 1;
11544          while (i >= 0 && baseState[i] == 0) {
11545              i--;
11546          }
11547          System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length);
11548          return baseState;
11549      }
11550  
11551      /**
11552       * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()}
11553       * on all Drawable objects associated with this view.
11554       */
11555      public void jumpDrawablesToCurrentState() {
11556          if (mBGDrawable != null) {
11557              mBGDrawable.jumpToCurrentState();
11558          }
11559      }
11560  
11561      /**
11562       * Sets the background color for this view.
11563       * @param color the color of the background
11564       */
11565      @RemotableViewMethod
11566      public void setBackgroundColor(int color) {
11567          if (mBGDrawable instanceof ColorDrawable) {
11568              ((ColorDrawable) mBGDrawable).setColor(color);
11569          } else {
11570              setBackgroundDrawable(new ColorDrawable(color));
11571          }
11572      }
11573  
11574      /**
11575       * Set the background to a given resource. The resource should refer to
11576       * a Drawable object or 0 to remove the background.
11577       * @param resid The identifier of the resource.
11578       * @attr ref android.R.styleable#View_background
11579       */
11580      @RemotableViewMethod
11581      public void setBackgroundResource(int resid) {
11582          if (resid != 0 && resid == mBackgroundResource) {
11583              return;
11584          }
11585  
11586          Drawable d= null;
11587          if (resid != 0) {
11588              d = mResources.getDrawable(resid);
11589          }
11590          setBackgroundDrawable(d);
11591  
11592          mBackgroundResource = resid;
11593      }
11594  
11595      /**
11596       * Set the background to a given Drawable, or remove the background. If the
11597       * background has padding, this View's padding is set to the background's
11598       * padding. However, when a background is removed, this View's padding isn't
11599       * touched. If setting the padding is desired, please use
11600       * {@link #setPadding(int, int, int, int)}.
11601       *
11602       * @param d The Drawable to use as the background, or null to remove the
11603       *        background
11604       */
11605      public void setBackgroundDrawable(Drawable d) {
11606          if (d == mBGDrawable) {
11607              return;
11608          }
11609  
11610          boolean requestLayout = false;
11611  
11612          mBackgroundResource = 0;
11613  
11614          /*
11615           * Regardless of whether we're setting a new background or not, we want
11616           * to clear the previous drawable.
11617           */
11618          if (mBGDrawable != null) {
11619              mBGDrawable.setCallback(null);
11620              unscheduleDrawable(mBGDrawable);
11621          }
11622  
11623          if (d != null) {
11624              Rect padding = sThreadLocal.get();
11625              if (padding == null) {
11626                  padding = new Rect();
11627                  sThreadLocal.set(padding);
11628              }
11629              if (d.getPadding(padding)) {
11630                  switch (d.getResolvedLayoutDirectionSelf()) {
11631                      case LAYOUT_DIRECTION_RTL:
11632                          setPadding(padding.right, padding.top, padding.left, padding.bottom);
11633                          break;
11634                      case LAYOUT_DIRECTION_LTR:
11635                      default:
11636                          setPadding(padding.left, padding.top, padding.right, padding.bottom);
11637                  }
11638              }
11639  
11640              // Compare the minimum sizes of the old Drawable and the new.  If there isn't an old or
11641              // if it has a different minimum size, we should layout again
11642              if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() ||
11643                      mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) {
11644                  requestLayout = true;
11645              }
11646  
11647              d.setCallback(this);
11648              if (d.isStateful()) {
11649                  d.setState(getDrawableState());
11650              }
11651              d.setVisible(getVisibility() == VISIBLE, false);
11652              mBGDrawable = d;
11653  
11654              if ((mPrivateFlags & SKIP_DRAW) != 0) {
11655                  mPrivateFlags &= ~SKIP_DRAW;
11656                  mPrivateFlags |= ONLY_DRAWS_BACKGROUND;
11657                  requestLayout = true;
11658              }
11659          } else {
11660              /* Remove the background */
11661              mBGDrawable = null;
11662  
11663              if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) {
11664                  /*
11665                   * This view ONLY drew the background before and we're removing
11666                   * the background, so now it won't draw anything
11667                   * (hence we SKIP_DRAW)
11668                   */
11669                  mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND;
11670                  mPrivateFlags |= SKIP_DRAW;
11671              }
11672  
11673              /*
11674               * When the background is set, we try to apply its padding to this
11675               * View. When the background is removed, we don't touch this View's
11676               * padding. This is noted in the Javadocs. Hence, we don't need to
11677               * requestLayout(), the invalidate() below is sufficient.
11678               */
11679  
11680              // The old background's minimum size could have affected this
11681              // View's layout, so let's requestLayout
11682              requestLayout = true;
11683          }
11684  
11685          computeOpaqueFlags();
11686  
11687          if (requestLayout) {
11688              requestLayout();
11689          }
11690  
11691          mBackgroundSizeChanged = true;
11692          invalidate(true);
11693      }
11694  
11695      /**
11696       * Gets the background drawable
11697       * @return The drawable used as the background for this view, if any.
11698       */
11699      public Drawable getBackground() {
11700          return mBGDrawable;
11701      }
11702  
11703      /**
11704       * Sets the padding. The view may add on the space required to display
11705       * the scrollbars, depending on the style and visibility of the scrollbars.
11706       * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop},
11707       * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different
11708       * from the values set in this call.
11709       *
11710       * @attr ref android.R.styleable#View_padding
11711       * @attr ref android.R.styleable#View_paddingBottom
11712       * @attr ref android.R.styleable#View_paddingLeft
11713       * @attr ref android.R.styleable#View_paddingRight
11714       * @attr ref android.R.styleable#View_paddingTop
11715       * @param left the left padding in pixels
11716       * @param top the top padding in pixels
11717       * @param right the right padding in pixels
11718       * @param bottom the bottom padding in pixels
11719       */
11720      public void setPadding(int left, int top, int right, int bottom) {
11721          boolean changed = false;
11722  
11723          mUserPaddingRelative = false;
11724  
11725          mUserPaddingLeft = left;
11726          mUserPaddingRight = right;
11727          mUserPaddingBottom = bottom;
11728  
11729          final int viewFlags = mViewFlags;
11730  
11731          // Common case is there are no scroll bars.
11732          if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) {
11733              if ((viewFlags & SCROLLBARS_VERTICAL) != 0) {
11734                  final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0
11735                          ? 0 : getVerticalScrollbarWidth();
11736                  switch (mVerticalScrollbarPosition) {
11737                      case SCROLLBAR_POSITION_DEFAULT:
11738                          if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) {
11739                              left += offset;
11740                          } else {
11741                              right += offset;
11742                          }
11743                          break;
11744                      case SCROLLBAR_POSITION_RIGHT:
11745                          right += offset;
11746                          break;
11747                      case SCROLLBAR_POSITION_LEFT:
11748                          left += offset;
11749                          break;
11750                  }
11751              }
11752              if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) {
11753                  bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0
11754                          ? 0 : getHorizontalScrollbarHeight();
11755              }
11756          }
11757  
11758          if (mPaddingLeft != left) {
11759              changed = true;
11760              mPaddingLeft = left;
11761          }
11762          if (mPaddingTop != top) {
11763              changed = true;
11764              mPaddingTop = top;
11765          }
11766          if (mPaddingRight != right) {
11767              changed = true;
11768              mPaddingRight = right;
11769          }
11770          if (mPaddingBottom != bottom) {
11771              changed = true;
11772              mPaddingBottom = bottom;
11773          }
11774  
11775          if (changed) {
11776              requestLayout();
11777          }
11778      }
11779  
11780      /**
11781       * Sets the relative padding. The view may add on the space required to display
11782       * the scrollbars, depending on the style and visibility of the scrollbars.
11783       * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop},
11784       * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different
11785       * from the values set in this call.
11786       *
11787       * @attr ref android.R.styleable#View_padding
11788       * @attr ref android.R.styleable#View_paddingBottom
11789       * @attr ref android.R.styleable#View_paddingStart
11790       * @attr ref android.R.styleable#View_paddingEnd
11791       * @attr ref android.R.styleable#View_paddingTop
11792       * @param start the start padding in pixels
11793       * @param top the top padding in pixels
11794       * @param end the end padding in pixels
11795       * @param bottom the bottom padding in pixels
11796       *
11797       * @hide
11798       */
11799      public void setPaddingRelative(int start, int top, int end, int bottom) {
11800          mUserPaddingRelative = true;
11801  
11802          mUserPaddingStart = start;
11803          mUserPaddingEnd = end;
11804  
11805          switch(getResolvedLayoutDirection()) {
11806              case LAYOUT_DIRECTION_RTL:
11807                  setPadding(end, top, start, bottom);
11808                  break;
11809              case LAYOUT_DIRECTION_LTR:
11810              default:
11811                  setPadding(start, top, end, bottom);
11812          }
11813      }
11814  
11815      /**
11816       * Returns the top padding of this view.
11817       *
11818       * @return the top padding in pixels
11819       */
11820      public int getPaddingTop() {
11821          return mPaddingTop;
11822      }
11823  
11824      /**
11825       * Returns the bottom padding of this view. If there are inset and enabled
11826       * scrollbars, this value may include the space required to display the
11827       * scrollbars as well.
11828       *
11829       * @return the bottom padding in pixels
11830       */
11831      public int getPaddingBottom() {
11832          return mPaddingBottom;
11833      }
11834  
11835      /**
11836       * Returns the left padding of this view. If there are inset and enabled
11837       * scrollbars, this value may include the space required to display the
11838       * scrollbars as well.
11839       *
11840       * @return the left padding in pixels
11841       */
11842      public int getPaddingLeft() {
11843          return mPaddingLeft;
11844      }
11845  
11846      /**
11847       * Returns the start padding of this view. If there are inset and enabled
11848       * scrollbars, this value may include the space required to display the
11849       * scrollbars as well.
11850       *
11851       * @return the start padding in pixels
11852       *
11853       * @hide
11854       */
11855      public int getPaddingStart() {
11856          return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ?
11857                  mPaddingRight : mPaddingLeft;
11858      }
11859  
11860      /**
11861       * Returns the right padding of this view. If there are inset and enabled
11862       * scrollbars, this value may include the space required to display the
11863       * scrollbars as well.
11864       *
11865       * @return the right padding in pixels
11866       */
11867      public int getPaddingRight() {
11868          return mPaddingRight;
11869      }
11870  
11871      /**
11872       * Returns the end padding of this view. If there are inset and enabled
11873       * scrollbars, this value may include the space required to display the
11874       * scrollbars as well.
11875       *
11876       * @return the end padding in pixels
11877       *
11878       * @hide
11879       */
11880      public int getPaddingEnd() {
11881          return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ?
11882                  mPaddingLeft : mPaddingRight;
11883      }
11884  
11885      /**
11886       * Return if the padding as been set thru relative values
11887       * {@link #setPaddingRelative(int, int, int, int)} or thru
11888       * @attr ref android.R.styleable#View_paddingStart or
11889       * @attr ref android.R.styleable#View_paddingEnd
11890       *
11891       * @return true if the padding is relative or false if it is not.
11892       *
11893       * @hide
11894       */
11895      public boolean isPaddingRelative() {
11896          return mUserPaddingRelative;
11897      }
11898  
11899      /**
11900       * Changes the selection state of this view. A view can be selected or not.
11901       * Note that selection is not the same as focus. Views are typically
11902       * selected in the context of an AdapterView like ListView or GridView;
11903       * the selected view is the view that is highlighted.
11904       *
11905       * @param selected true if the view must be selected, false otherwise
11906       */
11907      public void setSelected(boolean selected) {
11908          if (((mPrivateFlags & SELECTED) != 0) != selected) {
11909              mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0);
11910              if (!selected) resetPressedState();
11911              invalidate(true);
11912              refreshDrawableState();
11913              dispatchSetSelected(selected);
11914          }
11915      }
11916  
11917      /**
11918       * Dispatch setSelected to all of this View's children.
11919       *
11920       * @see #setSelected(boolean)
11921       *
11922       * @param selected The new selected state
11923       */
11924      protected void dispatchSetSelected(boolean selected) {
11925      }
11926  
11927      /**
11928       * Indicates the selection state of this view.
11929       *
11930       * @return true if the view is selected, false otherwise
11931       */
11932      @ViewDebug.ExportedProperty
11933      public boolean isSelected() {
11934          return (mPrivateFlags & SELECTED) != 0;
11935      }
11936  
11937      /**
11938       * Changes the activated state of this view. A view can be activated or not.
11939       * Note that activation is not the same as selection.  Selection is
11940       * a transient property, representing the view (hierarchy) the user is
11941       * currently interacting with.  Activation is a longer-term state that the
11942       * user can move views in and out of.  For example, in a list view with
11943       * single or multiple selection enabled, the views in the current selection
11944       * set are activated.  (Um, yeah, we are deeply sorry about the terminology
11945       * here.)  The activated state is propagated down to children of the view it
11946       * is set on.
11947       *
11948       * @param activated true if the view must be activated, false otherwise
11949       */
11950      public void setActivated(boolean activated) {
11951          if (((mPrivateFlags & ACTIVATED) != 0) != activated) {
11952              mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0);
11953              invalidate(true);
11954              refreshDrawableState();
11955              dispatchSetActivated(activated);
11956          }
11957      }
11958  
11959      /**
11960       * Dispatch setActivated to all of this View's children.
11961       *
11962       * @see #setActivated(boolean)
11963       *
11964       * @param activated The new activated state
11965       */
11966      protected void dispatchSetActivated(boolean activated) {
11967      }
11968  
11969      /**
11970       * Indicates the activation state of this view.
11971       *
11972       * @return true if the view is activated, false otherwise
11973       */
11974      @ViewDebug.ExportedProperty
11975      public boolean isActivated() {
11976          return (mPrivateFlags & ACTIVATED) != 0;
11977      }
11978  
11979      /**
11980       * Returns the ViewTreeObserver for this view's hierarchy. The view tree
11981       * observer can be used to get notifications when global events, like
11982       * layout, happen.
11983       *
11984       * The returned ViewTreeObserver observer is not guaranteed to remain
11985       * valid for the lifetime of this View. If the caller of this method keeps
11986       * a long-lived reference to ViewTreeObserver, it should always check for
11987       * the return value of {@link ViewTreeObserver#isAlive()}.
11988       *
11989       * @return The ViewTreeObserver for this view's hierarchy.
11990       */
11991      public ViewTreeObserver getViewTreeObserver() {
11992          if (mAttachInfo != null) {
11993              return mAttachInfo.mTreeObserver;
11994          }
11995          if (mFloatingTreeObserver == null) {
11996              mFloatingTreeObserver = new ViewTreeObserver();
11997          }
11998          return mFloatingTreeObserver;
11999      }
12000  
12001      /**
12002       * <p>Finds the topmost view in the current view hierarchy.</p>
12003       *
12004       * @return the topmost view containing this view
12005       */
12006      public View getRootView() {
12007          if (mAttachInfo != null) {
12008              final View v = mAttachInfo.mRootView;
12009              if (v != null) {
12010                  return v;
12011              }
12012          }
12013  
12014          View parent = this;
12015  
12016          while (parent.mParent != null && parent.mParent instanceof View) {
12017              parent = (View) parent.mParent;
12018          }
12019  
12020          return parent;
12021      }
12022  
12023      /**
12024       * <p>Computes the coordinates of this view on the screen. The argument
12025       * must be an array of two integers. After the method returns, the array
12026       * contains the x and y location in that order.</p>
12027       *
12028       * @param location an array of two integers in which to hold the coordinates
12029       */
12030      public void getLocationOnScreen(int[] location) {
12031          getLocationInWindow(location);
12032  
12033          final AttachInfo info = mAttachInfo;
12034          if (info != null) {
12035              location[0] += info.mWindowLeft;
12036              location[1] += info.mWindowTop;
12037          }
12038      }
12039  
12040      /**
12041       * <p>Computes the coordinates of this view in its window. The argument
12042       * must be an array of two integers. After the method returns, the array
12043       * contains the x and y location in that order.</p>
12044       *
12045       * @param location an array of two integers in which to hold the coordinates
12046       */
12047      public void getLocationInWindow(int[] location) {
12048          if (location == null || location.length < 2) {
12049              throw new IllegalArgumentException("location must be an array of "
12050                      + "two integers");
12051          }
12052  
12053          location[0] = mLeft;
12054          location[1] = mTop;
12055          if (mTransformationInfo != null) {
12056              location[0] += (int) (mTransformationInfo.mTranslationX + 0.5f);
12057              location[1] += (int) (mTransformationInfo.mTranslationY + 0.5f);
12058          }
12059  
12060          ViewParent viewParent = mParent;
12061          while (viewParent instanceof View) {
12062              final View view = (View)viewParent;
12063              location[0] += view.mLeft - view.mScrollX;
12064              location[1] += view.mTop - view.mScrollY;
12065              if (view.mTransformationInfo != null) {
12066                  location[0] += (int) (view.mTransformationInfo.mTranslationX + 0.5f);
12067                  location[1] += (int) (view.mTransformationInfo.mTranslationY + 0.5f);
12068              }
12069              viewParent = view.mParent;
12070          }
12071  
12072          if (viewParent instanceof ViewRootImpl) {
12073              // *cough*
12074              final ViewRootImpl vr = (ViewRootImpl)viewParent;
12075              location[1] -= vr.mCurScrollY;
12076          }
12077      }
12078  
12079      /**
12080       * {@hide}
12081       * @param id the id of the view to be found
12082       * @return the view of the specified id, null if cannot be found
12083       */
12084      protected View findViewTraversal(int id) {
12085          if (id == mID) {
12086              return this;
12087          }
12088          return null;
12089      }
12090  
12091      /**
12092       * {@hide}
12093       * @param tag the tag of the view to be found
12094       * @return the view of specified tag, null if cannot be found
12095       */
12096      protected View findViewWithTagTraversal(Object tag) {
12097          if (tag != null && tag.equals(mTag)) {
12098              return this;
12099          }
12100          return null;
12101      }
12102  
12103      /**
12104       * {@hide}
12105       * @param predicate The predicate to evaluate.
12106       * @param childToSkip If not null, ignores this child during the recursive traversal.
12107       * @return The first view that matches the predicate or null.
12108       */
12109      protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) {
12110          if (predicate.apply(this)) {
12111              return this;
12112          }
12113          return null;
12114      }
12115  
12116      /**
12117       * Look for a child view with the given id.  If this view has the given
12118       * id, return this view.
12119       *
12120       * @param id The id to search for.
12121       * @return The view that has the given id in the hierarchy or null
12122       */
12123      public final View findViewById(int id) {
12124          if (id < 0) {
12125              return null;
12126          }
12127          return findViewTraversal(id);
12128      }
12129  
12130      /**
12131       * Finds a view by its unuque and stable accessibility id.
12132       *
12133       * @param accessibilityId The searched accessibility id.
12134       * @return The found view.
12135       */
12136      final View findViewByAccessibilityId(int accessibilityId) {
12137          if (accessibilityId < 0) {
12138              return null;
12139          }
12140          return findViewByAccessibilityIdTraversal(accessibilityId);
12141      }
12142  
12143      /**
12144       * Performs the traversal to find a view by its unuque and stable accessibility id.
12145       *
12146       * <strong>Note:</strong>This method does not stop at the root namespace
12147       * boundary since the user can touch the screen at an arbitrary location
12148       * potentially crossing the root namespace bounday which will send an
12149       * accessibility event to accessibility services and they should be able
12150       * to obtain the event source. Also accessibility ids are guaranteed to be
12151       * unique in the window.
12152       *
12153       * @param accessibilityId The accessibility id.
12154       * @return The found view.
12155       */
12156      View findViewByAccessibilityIdTraversal(int accessibilityId) {
12157          if (getAccessibilityViewId() == accessibilityId) {
12158              return this;
12159          }
12160          return null;
12161      }
12162  
12163      /**
12164       * Look for a child view with the given tag.  If this view has the given
12165       * tag, return this view.
12166       *
12167       * @param tag The tag to search for, using "tag.equals(getTag())".
12168       * @return The View that has the given tag in the hierarchy or null
12169       */
12170      public final View findViewWithTag(Object tag) {
12171          if (tag == null) {
12172              return null;
12173          }
12174          return findViewWithTagTraversal(tag);
12175      }
12176  
12177      /**
12178       * {@hide}
12179       * Look for a child view that matches the specified predicate.
12180       * If this view matches the predicate, return this view.
12181       *
12182       * @param predicate The predicate to evaluate.
12183       * @return The first view that matches the predicate or null.
12184       */
12185      public final View findViewByPredicate(Predicate<View> predicate) {
12186          return findViewByPredicateTraversal(predicate, null);
12187      }
12188  
12189      /**
12190       * {@hide}
12191       * Look for a child view that matches the specified predicate,
12192       * starting with the specified view and its descendents and then
12193       * recusively searching the ancestors and siblings of that view
12194       * until this view is reached.
12195       *
12196       * This method is useful in cases where the predicate does not match
12197       * a single unique view (perhaps multiple views use the same id)
12198       * and we are trying to find the view that is "closest" in scope to the
12199       * starting view.
12200       *
12201       * @param start The view to start from.
12202       * @param predicate The predicate to evaluate.
12203       * @return The first view that matches the predicate or null.
12204       */
12205      public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) {
12206          View childToSkip = null;
12207          for (;;) {
12208              View view = start.findViewByPredicateTraversal(predicate, childToSkip);
12209              if (view != null || start == this) {
12210                  return view;
12211              }
12212  
12213              ViewParent parent = start.getParent();
12214              if (parent == null || !(parent instanceof View)) {
12215                  return null;
12216              }
12217  
12218              childToSkip = start;
12219              start = (View) parent;
12220          }
12221      }
12222  
12223      /**
12224       * Sets the identifier for this view. The identifier does not have to be
12225       * unique in this view's hierarchy. The identifier should be a positive
12226       * number.
12227       *
12228       * @see #NO_ID
12229       * @see #getId()
12230       * @see #findViewById(int)
12231       *
12232       * @param id a number used to identify the view
12233       *
12234       * @attr ref android.R.styleable#View_id
12235       */
12236      public void setId(int id) {
12237          mID = id;
12238      }
12239  
12240      /**
12241       * {@hide}
12242       *
12243       * @param isRoot true if the view belongs to the root namespace, false
12244       *        otherwise
12245       */
12246      public void setIsRootNamespace(boolean isRoot) {
12247          if (isRoot) {
12248              mPrivateFlags |= IS_ROOT_NAMESPACE;
12249          } else {
12250              mPrivateFlags &= ~IS_ROOT_NAMESPACE;
12251          }
12252      }
12253  
12254      /**
12255       * {@hide}
12256       *
12257       * @return true if the view belongs to the root namespace, false otherwise
12258       */
12259      public boolean isRootNamespace() {
12260          return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0;
12261      }
12262  
12263      /**
12264       * Returns this view's identifier.
12265       *
12266       * @return a positive integer used to identify the view or {@link #NO_ID}
12267       *         if the view has no ID
12268       *
12269       * @see #setId(int)
12270       * @see #findViewById(int)
12271       * @attr ref android.R.styleable#View_id
12272       */
12273      @ViewDebug.CapturedViewProperty
12274      public int getId() {
12275          return mID;
12276      }
12277  
12278      /**
12279       * Returns this view's tag.
12280       *
12281       * @return the Object stored in this view as a tag
12282       *
12283       * @see #setTag(Object)
12284       * @see #getTag(int)
12285       */
12286      @ViewDebug.ExportedProperty
12287      public Object getTag() {
12288          return mTag;
12289      }
12290  
12291      /**
12292       * Sets the tag associated with this view. A tag can be used to mark
12293       * a view in its hierarchy and does not have to be unique within the
12294       * hierarchy. Tags can also be used to store data within a view without
12295       * resorting to another data structure.
12296       *
12297       * @param tag an Object to tag the view with
12298       *
12299       * @see #getTag()
12300       * @see #setTag(int, Object)
12301       */
12302      public void setTag(final Object tag) {
12303          mTag = tag;
12304      }
12305  
12306      /**
12307       * Returns the tag associated with this view and the specified key.
12308       *
12309       * @param key The key identifying the tag
12310       *
12311       * @return the Object stored in this view as a tag
12312       *
12313       * @see #setTag(int, Object)
12314       * @see #getTag()
12315       */
12316      public Object getTag(int key) {
12317          if (mKeyedTags != null) return mKeyedTags.get(key);
12318          return null;
12319      }
12320  
12321      /**
12322       * Sets a tag associated with this view and a key. A tag can be used
12323       * to mark a view in its hierarchy and does not have to be unique within
12324       * the hierarchy. Tags can also be used to store data within a view
12325       * without resorting to another data structure.
12326       *
12327       * The specified key should be an id declared in the resources of the
12328       * application to ensure it is unique (see the <a
12329       * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>).
12330       * Keys identified as belonging to
12331       * the Android framework or not associated with any package will cause
12332       * an {@link IllegalArgumentException} to be thrown.
12333       *
12334       * @param key The key identifying the tag
12335       * @param tag An Object to tag the view with
12336       *
12337       * @throws IllegalArgumentException If they specified key is not valid
12338       *
12339       * @see #setTag(Object)
12340       * @see #getTag(int)
12341       */
12342      public void setTag(int key, final Object tag) {
12343          // If the package id is 0x00 or 0x01, it's either an undefined package
12344          // or a framework id
12345          if ((key >>> 24) < 2) {
12346              throw new IllegalArgumentException("The key must be an application-specific "
12347                      + "resource id.");
12348          }
12349  
12350          setKeyedTag(key, tag);
12351      }
12352  
12353      /**
12354       * Variation of {@link #setTag(int, Object)} that enforces the key to be a
12355       * framework id.
12356       *
12357       * @hide
12358       */
12359      public void setTagInternal(int key, Object tag) {
12360          if ((key >>> 24) != 0x1) {
12361              throw new IllegalArgumentException("The key must be a framework-specific "
12362                      + "resource id.");
12363          }
12364  
12365          setKeyedTag(key, tag);
12366      }
12367  
12368      private void setKeyedTag(int key, Object tag) {
12369          if (mKeyedTags == null) {
12370              mKeyedTags = new SparseArray<Object>();
12371          }
12372  
12373          mKeyedTags.put(key, tag);
12374      }
12375  
12376      /**
12377       * @param consistency The type of consistency. See ViewDebug for more information.
12378       *
12379       * @hide
12380       */
12381      protected boolean dispatchConsistencyCheck(int consistency) {
12382          return onConsistencyCheck(consistency);
12383      }
12384  
12385      /**
12386       * Method that subclasses should implement to check their consistency. The type of
12387       * consistency check is indicated by the bit field passed as a parameter.
12388       *
12389       * @param consistency The type of consistency. See ViewDebug for more information.
12390       *
12391       * @throws IllegalStateException if the view is in an inconsistent state.
12392       *
12393       * @hide
12394       */
12395      protected boolean onConsistencyCheck(int consistency) {
12396          boolean result = true;
12397  
12398          final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0;
12399          final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0;
12400  
12401          if (checkLayout) {
12402              if (getParent() == null) {
12403                  result = false;
12404                  android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG,
12405                          "View " + this + " does not have a parent.");
12406              }
12407  
12408              if (mAttachInfo == null) {
12409                  result = false;
12410                  android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG,
12411                          "View " + this + " is not attached to a window.");
12412              }
12413          }
12414  
12415          if (checkDrawing) {
12416              // Do not check the DIRTY/DRAWN flags because views can call invalidate()
12417              // from their draw() method
12418  
12419              if ((mPrivateFlags & DRAWN) != DRAWN &&
12420                      (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) {
12421                  result = false;
12422                  android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG,
12423                          "View " + this + " was invalidated but its drawing cache is valid.");
12424              }
12425          }
12426  
12427          return result;
12428      }
12429  
12430      /**
12431       * Prints information about this view in the log output, with the tag
12432       * {@link #VIEW_LOG_TAG}.
12433       *
12434       * @hide
12435       */
12436      public void debug() {
12437          debug(0);
12438      }
12439  
12440      /**
12441       * Prints information about this view in the log output, with the tag
12442       * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an
12443       * indentation defined by the <code>depth</code>.
12444       *
12445       * @param depth the indentation level
12446       *
12447       * @hide
12448       */
12449      protected void debug(int depth) {
12450          String output = debugIndent(depth - 1);
12451  
12452          output += "+ " + this;
12453          int id = getId();
12454          if (id != -1) {
12455              output += " (id=" + id + ")";
12456          }
12457          Object tag = getTag();
12458          if (tag != null) {
12459              output += " (tag=" + tag + ")";
12460          }
12461          Log.d(VIEW_LOG_TAG, output);
12462  
12463          if ((mPrivateFlags & FOCUSED) != 0) {
12464              output = debugIndent(depth) + " FOCUSED";
12465              Log.d(VIEW_LOG_TAG, output);
12466          }
12467  
12468          output = debugIndent(depth);
12469          output += "frame={" + mLeft + ", " + mTop + ", " + mRight
12470                  + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY
12471                  + "} ";
12472          Log.d(VIEW_LOG_TAG, output);
12473  
12474          if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0
12475                  || mPaddingBottom != 0) {
12476              output = debugIndent(depth);
12477              output += "padding={" + mPaddingLeft + ", " + mPaddingTop
12478                      + ", " + mPaddingRight + ", " + mPaddingBottom + "}";
12479              Log.d(VIEW_LOG_TAG, output);
12480          }
12481  
12482          output = debugIndent(depth);
12483          output += "mMeasureWidth=" + mMeasuredWidth +
12484                  " mMeasureHeight=" + mMeasuredHeight;
12485          Log.d(VIEW_LOG_TAG, output);
12486  
12487          output = debugIndent(depth);
12488          if (mLayoutParams == null) {
12489              output += "BAD! no layout params";
12490          } else {
12491              output = mLayoutParams.debug(output);
12492          }
12493          Log.d(VIEW_LOG_TAG, output);
12494  
12495          output = debugIndent(depth);
12496          output += "flags={";
12497          output += View.printFlags(mViewFlags);
12498          output += "}";
12499          Log.d(VIEW_LOG_TAG, output);
12500  
12501          output = debugIndent(depth);
12502          output += "privateFlags={";
12503          output += View.printPrivateFlags(mPrivateFlags);
12504          output += "}";
12505          Log.d(VIEW_LOG_TAG, output);
12506      }
12507  
12508      /**
12509       * Creates an string of whitespaces used for indentation.
12510       *
12511       * @param depth the indentation level
12512       * @return a String containing (depth * 2 + 3) * 2 white spaces
12513       *
12514       * @hide
12515       */
12516      protected static String debugIndent(int depth) {
12517          StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2);
12518          for (int i = 0; i < (depth * 2) + 3; i++) {
12519              spaces.append(' ').append(' ');
12520          }
12521          return spaces.toString();
12522      }
12523  
12524      /**
12525       * <p>Return the offset of the widget's text baseline from the widget's top
12526       * boundary. If this widget does not support baseline alignment, this
12527       * method returns -1. </p>
12528       *
12529       * @return the offset of the baseline within the widget's bounds or -1
12530       *         if baseline alignment is not supported
12531       */
12532      @ViewDebug.ExportedProperty(category = "layout")
12533      public int getBaseline() {
12534          return -1;
12535      }
12536  
12537      /**
12538       * Call this when something has changed which has invalidated the
12539       * layout of this view. This will schedule a layout pass of the view
12540       * tree.
12541       */
12542      public void requestLayout() {
12543          if (ViewDebug.TRACE_HIERARCHY) {
12544              ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT);
12545          }
12546  
12547          mPrivateFlags |= FORCE_LAYOUT;
12548          mPrivateFlags |= INVALIDATED;
12549  
12550          if (mParent != null) {
12551              if (mLayoutParams != null) {
12552                  mLayoutParams.resolveWithDirection(getResolvedLayoutDirection());
12553              }
12554              if (!mParent.isLayoutRequested()) {
12555                  mParent.requestLayout();
12556              }
12557          }
12558      }
12559  
12560      /**
12561       * Forces this view to be laid out during the next layout pass.
12562       * This method does not call requestLayout() or forceLayout()
12563       * on the parent.
12564       */
12565      public void forceLayout() {
12566          mPrivateFlags |= FORCE_LAYOUT;
12567          mPrivateFlags |= INVALIDATED;
12568      }
12569  
12570      /**
12571       * <p>
12572       * This is called to find out how big a view should be. The parent
12573       * supplies constraint information in the width and height parameters.
12574       * </p>
12575       *
12576       * <p>
12577       * The actual mesurement work of a view is performed in
12578       * {@link #onMeasure(int, int)}, called by this method. Therefore, only
12579       * {@link #onMeasure(int, int)} can and must be overriden by subclasses.
12580       * </p>
12581       *
12582       *
12583       * @param widthMeasureSpec Horizontal space requirements as imposed by the
12584       *        parent
12585       * @param heightMeasureSpec Vertical space requirements as imposed by the
12586       *        parent
12587       *
12588       * @see #onMeasure(int, int)
12589       */
12590      public final void measure(int widthMeasureSpec, int heightMeasureSpec) {
12591          if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT ||
12592                  widthMeasureSpec != mOldWidthMeasureSpec ||
12593                  heightMeasureSpec != mOldHeightMeasureSpec) {
12594  
12595              // first clears the measured dimension flag
12596              mPrivateFlags &= ~MEASURED_DIMENSION_SET;
12597  
12598              if (ViewDebug.TRACE_HIERARCHY) {
12599                  ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE);
12600              }
12601  
12602              // measure ourselves, this should set the measured dimension flag back
12603              onMeasure(widthMeasureSpec, heightMeasureSpec);
12604  
12605              // flag not set, setMeasuredDimension() was not invoked, we raise
12606              // an exception to warn the developer
12607              if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) {
12608                  throw new IllegalStateException("onMeasure() did not set the"
12609                          + " measured dimension by calling"
12610                          + " setMeasuredDimension()");
12611              }
12612  
12613              mPrivateFlags |= LAYOUT_REQUIRED;
12614          }
12615  
12616          mOldWidthMeasureSpec = widthMeasureSpec;
12617          mOldHeightMeasureSpec = heightMeasureSpec;
12618      }
12619  
12620      /**
12621       * <p>
12622       * Measure the view and its content to determine the measured width and the
12623       * measured height. This method is invoked by {@link #measure(int, int)} and
12624       * should be overriden by subclasses to provide accurate and efficient
12625       * measurement of their contents.
12626       * </p>
12627       *
12628       * <p>
12629       * <strong>CONTRACT:</strong> When overriding this method, you
12630       * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the
12631       * measured width and height of this view. Failure to do so will trigger an
12632       * <code>IllegalStateException</code>, thrown by
12633       * {@link #measure(int, int)}. Calling the superclass'
12634       * {@link #onMeasure(int, int)} is a valid use.
12635       * </p>
12636       *
12637       * <p>
12638       * The base class implementation of measure defaults to the background size,
12639       * unless a larger size is allowed by the MeasureSpec. Subclasses should
12640       * override {@link #onMeasure(int, int)} to provide better measurements of
12641       * their content.
12642       * </p>
12643       *
12644       * <p>
12645       * If this method is overridden, it is the subclass's responsibility to make
12646       * sure the measured height and width are at least the view's minimum height
12647       * and width ({@link #getSuggestedMinimumHeight()} and
12648       * {@link #getSuggestedMinimumWidth()}).
12649       * </p>
12650       *
12651       * @param widthMeasureSpec horizontal space requirements as imposed by the parent.
12652       *                         The requirements are encoded with
12653       *                         {@link android.view.View.MeasureSpec}.
12654       * @param heightMeasureSpec vertical space requirements as imposed by the parent.
12655       *                         The requirements are encoded with
12656       *                         {@link android.view.View.MeasureSpec}.
12657       *
12658       * @see #getMeasuredWidth()
12659       * @see #getMeasuredHeight()
12660       * @see #setMeasuredDimension(int, int)
12661       * @see #getSuggestedMinimumHeight()
12662       * @see #getSuggestedMinimumWidth()
12663       * @see android.view.View.MeasureSpec#getMode(int)
12664       * @see android.view.View.MeasureSpec#getSize(int)
12665       */
12666      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
12667          setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec),
12668                  getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec));
12669      }
12670  
12671      /**
12672       * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the
12673       * measured width and measured height. Failing to do so will trigger an
12674       * exception at measurement time.</p>
12675       *
12676       * @param measuredWidth The measured width of this view.  May be a complex
12677       * bit mask as defined by {@link #MEASURED_SIZE_MASK} and
12678       * {@link #MEASURED_STATE_TOO_SMALL}.
12679       * @param measuredHeight The measured height of this view.  May be a complex
12680       * bit mask as defined by {@link #MEASURED_SIZE_MASK} and
12681       * {@link #MEASURED_STATE_TOO_SMALL}.
12682       */
12683      protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) {
12684          mMeasuredWidth = measuredWidth;
12685          mMeasuredHeight = measuredHeight;
12686  
12687          mPrivateFlags |= MEASURED_DIMENSION_SET;
12688      }
12689  
12690      /**
12691       * Merge two states as returned by {@link #getMeasuredState()}.
12692       * @param curState The current state as returned from a view or the result
12693       * of combining multiple views.
12694       * @param newState The new view state to combine.
12695       * @return Returns a new integer reflecting the combination of the two
12696       * states.
12697       */
12698      public static int combineMeasuredStates(int curState, int newState) {
12699          return curState | newState;
12700      }
12701  
12702      /**
12703       * Version of {@link #resolveSizeAndState(int, int, int)}
12704       * returning only the {@link #MEASURED_SIZE_MASK} bits of the result.
12705       */
12706      public static int resolveSize(int size, int measureSpec) {
12707          return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK;
12708      }
12709  
12710      /**
12711       * Utility to reconcile a desired size and state, with constraints imposed
12712       * by a MeasureSpec.  Will take the desired size, unless a different size
12713       * is imposed by the constraints.  The returned value is a compound integer,
12714       * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and
12715       * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting
12716       * size is smaller than the size the view wants to be.
12717       *
12718       * @param size How big the view wants to be
12719       * @param measureSpec Constraints imposed by the parent
12720       * @return Size information bit mask as defined by
12721       * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
12722       */
12723      public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) {
12724          int result = size;
12725          int specMode = MeasureSpec.getMode(measureSpec);
12726          int specSize =  MeasureSpec.getSize(measureSpec);
12727          switch (specMode) {
12728          case MeasureSpec.UNSPECIFIED:
12729              result = size;
12730              break;
12731          case MeasureSpec.AT_MOST:
12732              if (specSize < size) {
12733                  result = specSize | MEASURED_STATE_TOO_SMALL;
12734              } else {
12735                  result = size;
12736              }
12737              break;
12738          case MeasureSpec.EXACTLY:
12739              result = specSize;
12740              break;
12741          }
12742          return result | (childMeasuredState&MEASURED_STATE_MASK);
12743      }
12744  
12745      /**
12746       * Utility to return a default size. Uses the supplied size if the
12747       * MeasureSpec imposed no constraints. Will get larger if allowed
12748       * by the MeasureSpec.
12749       *
12750       * @param size Default size for this view
12751       * @param measureSpec Constraints imposed by the parent
12752       * @return The size this view should be.
12753       */
12754      public static int getDefaultSize(int size, int measureSpec) {
12755          int result = size;
12756          int specMode = MeasureSpec.getMode(measureSpec);
12757          int specSize = MeasureSpec.getSize(measureSpec);
12758  
12759          switch (specMode) {
12760          case MeasureSpec.UNSPECIFIED:
12761              result = size;
12762              break;
12763          case MeasureSpec.AT_MOST:
12764          case MeasureSpec.EXACTLY:
12765              result = specSize;
12766              break;
12767          }
12768          return result;
12769      }
12770  
12771      /**
12772       * Returns the suggested minimum height that the view should use. This
12773       * returns the maximum of the view's minimum height
12774       * and the background's minimum height
12775       * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}).
12776       * <p>
12777       * When being used in {@link #onMeasure(int, int)}, the caller should still
12778       * ensure the returned height is within the requirements of the parent.
12779       *
12780       * @return The suggested minimum height of the view.
12781       */
12782      protected int getSuggestedMinimumHeight() {
12783          int suggestedMinHeight = mMinHeight;
12784  
12785          if (mBGDrawable != null) {
12786              final int bgMinHeight = mBGDrawable.getMinimumHeight();
12787              if (suggestedMinHeight < bgMinHeight) {
12788                  suggestedMinHeight = bgMinHeight;
12789              }
12790          }
12791  
12792          return suggestedMinHeight;
12793      }
12794  
12795      /**
12796       * Returns the suggested minimum width that the view should use. This
12797       * returns the maximum of the view's minimum width)
12798       * and the background's minimum width
12799       *  ({@link android.graphics.drawable.Drawable#getMinimumWidth()}).
12800       * <p>
12801       * When being used in {@link #onMeasure(int, int)}, the caller should still
12802       * ensure the returned width is within the requirements of the parent.
12803       *
12804       * @return The suggested minimum width of the view.
12805       */
12806      protected int getSuggestedMinimumWidth() {
12807          int suggestedMinWidth = mMinWidth;
12808  
12809          if (mBGDrawable != null) {
12810              final int bgMinWidth = mBGDrawable.getMinimumWidth();
12811              if (suggestedMinWidth < bgMinWidth) {
12812                  suggestedMinWidth = bgMinWidth;
12813              }
12814          }
12815  
12816          return suggestedMinWidth;
12817      }
12818  
12819      /**
12820       * Sets the minimum height of the view. It is not guaranteed the view will
12821       * be able to achieve this minimum height (for example, if its parent layout
12822       * constrains it with less available height).
12823       *
12824       * @param minHeight The minimum height the view will try to be.
12825       */
12826      public void setMinimumHeight(int minHeight) {
12827          mMinHeight = minHeight;
12828      }
12829  
12830      /**
12831       * Sets the minimum width of the view. It is not guaranteed the view will
12832       * be able to achieve this minimum width (for example, if its parent layout
12833       * constrains it with less available width).
12834       *
12835       * @param minWidth The minimum width the view will try to be.
12836       */
12837      public void setMinimumWidth(int minWidth) {
12838          mMinWidth = minWidth;
12839      }
12840  
12841      /**
12842       * Get the animation currently associated with this view.
12843       *
12844       * @return The animation that is currently playing or
12845       *         scheduled to play for this view.
12846       */
12847      public Animation getAnimation() {
12848          return mCurrentAnimation;
12849      }
12850  
12851      /**
12852       * Start the specified animation now.
12853       *
12854       * @param animation the animation to start now
12855       */
12856      public void startAnimation(Animation animation) {
12857          animation.setStartTime(Animation.START_ON_FIRST_FRAME);
12858          setAnimation(animation);
12859          invalidateParentCaches();
12860          invalidate(true);
12861      }
12862  
12863      /**
12864       * Cancels any animations for this view.
12865       */
12866      public void clearAnimation() {
12867          if (mCurrentAnimation != null) {
12868              mCurrentAnimation.detach();
12869          }
12870          mCurrentAnimation = null;
12871          invalidateParentIfNeeded();
12872      }
12873  
12874      /**
12875       * Sets the next animation to play for this view.
12876       * If you want the animation to play immediately, use
12877       * startAnimation. This method provides allows fine-grained
12878       * control over the start time and invalidation, but you
12879       * must make sure that 1) the animation has a start time set, and
12880       * 2) the view will be invalidated when the animation is supposed to
12881       * start.
12882       *
12883       * @param animation The next animation, or null.
12884       */
12885      public void setAnimation(Animation animation) {
12886          mCurrentAnimation = animation;
12887          if (animation != null) {
12888              animation.reset();
12889          }
12890      }
12891  
12892      /**
12893       * Invoked by a parent ViewGroup to notify the start of the animation
12894       * currently associated with this view. If you override this method,
12895       * always call super.onAnimationStart();
12896       *
12897       * @see #setAnimation(android.view.animation.Animation)
12898       * @see #getAnimation()
12899       */
12900      protected void onAnimationStart() {
12901          mPrivateFlags |= ANIMATION_STARTED;
12902      }
12903  
12904      /**
12905       * Invoked by a parent ViewGroup to notify the end of the animation
12906       * currently associated with this view. If you override this method,
12907       * always call super.onAnimationEnd();
12908       *
12909       * @see #setAnimation(android.view.animation.Animation)
12910       * @see #getAnimation()
12911       */
12912      protected void onAnimationEnd() {
12913          mPrivateFlags &= ~ANIMATION_STARTED;
12914      }
12915  
12916      /**
12917       * Invoked if there is a Transform that involves alpha. Subclass that can
12918       * draw themselves with the specified alpha should return true, and then
12919       * respect that alpha when their onDraw() is called. If this returns false
12920       * then the view may be redirected to draw into an offscreen buffer to
12921       * fulfill the request, which will look fine, but may be slower than if the
12922       * subclass handles it internally. The default implementation returns false.
12923       *
12924       * @param alpha The alpha (0..255) to apply to the view's drawing
12925       * @return true if the view can draw with the specified alpha.
12926       */
12927      protected boolean onSetAlpha(int alpha) {
12928          return false;
12929      }
12930  
12931      /**
12932       * This is used by the RootView to perform an optimization when
12933       * the view hierarchy contains one or several SurfaceView.
12934       * SurfaceView is always considered transparent, but its children are not,
12935       * therefore all View objects remove themselves from the global transparent
12936       * region (passed as a parameter to this function).
12937       *
12938       * @param region The transparent region for this ViewAncestor (window).
12939       *
12940       * @return Returns true if the effective visibility of the view at this
12941       * point is opaque, regardless of the transparent region; returns false
12942       * if it is possible for underlying windows to be seen behind the view.
12943       *
12944       * {@hide}
12945       */
12946      public boolean gatherTransparentRegion(Region region) {
12947          final AttachInfo attachInfo = mAttachInfo;
12948          if (region != null && attachInfo != null) {
12949              final int pflags = mPrivateFlags;
12950              if ((pflags & SKIP_DRAW) == 0) {
12951                  // The SKIP_DRAW flag IS NOT set, so this view draws. We need to
12952                  // remove it from the transparent region.
12953                  final int[] location = attachInfo.mTransparentLocation;
12954                  getLocationInWindow(location);
12955                  region.op(location[0], location[1], location[0] + mRight - mLeft,
12956                          location[1] + mBottom - mTop, Region.Op.DIFFERENCE);
12957              } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) {
12958                  // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable
12959                  // exists, so we remove the background drawable's non-transparent
12960                  // parts from this transparent region.
12961                  applyDrawableToTransparentRegion(mBGDrawable, region);
12962              }
12963          }
12964          return true;
12965      }
12966  
12967      /**
12968       * Play a sound effect for this view.
12969       *
12970       * <p>The framework will play sound effects for some built in actions, such as
12971       * clicking, but you may wish to play these effects in your widget,
12972       * for instance, for internal navigation.
12973       *
12974       * <p>The sound effect will only be played if sound effects are enabled by the user, and
12975       * {@link #isSoundEffectsEnabled()} is true.
12976       *
12977       * @param soundConstant One of the constants defined in {@link SoundEffectConstants}
12978       */
12979      public void playSoundEffect(int soundConstant) {
12980          if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) {
12981              return;
12982          }
12983          mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant);
12984      }
12985  
12986      /**
12987       * BZZZTT!!1!
12988       *
12989       * <p>Provide haptic feedback to the user for this view.
12990       *
12991       * <p>The framework will provide haptic feedback for some built in actions,
12992       * such as long presses, but you may wish to provide feedback for your
12993       * own widget.
12994       *
12995       * <p>The feedback will only be performed if
12996       * {@link #isHapticFeedbackEnabled()} is true.
12997       *
12998       * @param feedbackConstant One of the constants defined in
12999       * {@link HapticFeedbackConstants}
13000       */
13001      public boolean performHapticFeedback(int feedbackConstant) {
13002          return performHapticFeedback(feedbackConstant, 0);
13003      }
13004  
13005      /**
13006       * BZZZTT!!1!
13007       *
13008       * <p>Like {@link #performHapticFeedback(int)}, with additional options.
13009       *
13010       * @param feedbackConstant One of the constants defined in
13011       * {@link HapticFeedbackConstants}
13012       * @param flags Additional flags as per {@link HapticFeedbackConstants}.
13013       */
13014      public boolean performHapticFeedback(int feedbackConstant, int flags) {
13015          if (mAttachInfo == null) {
13016              return false;
13017          }
13018          //noinspection SimplifiableIfStatement
13019          if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0
13020                  && !isHapticFeedbackEnabled()) {
13021              return false;
13022          }
13023          return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant,
13024                  (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0);
13025      }
13026  
13027      /**
13028       * Request that the visibility of the status bar be changed.
13029       * @param visibility  Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or
13030       * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}.
13031       */
13032      public void setSystemUiVisibility(int visibility) {
13033          if (visibility != mSystemUiVisibility) {
13034              mSystemUiVisibility = visibility;
13035              if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
13036                  mParent.recomputeViewAttributes(this);
13037              }
13038          }
13039      }
13040  
13041      /**
13042       * Returns the status bar visibility that this view has requested.
13043       * @return  Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or
13044       * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}.
13045       */
13046      public int getSystemUiVisibility() {
13047          return mSystemUiVisibility;
13048      }
13049  
13050      /**
13051       * Set a listener to receive callbacks when the visibility of the system bar changes.
13052       * @param l  The {@link OnSystemUiVisibilityChangeListener} to receive callbacks.
13053       */
13054      public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) {
13055          mOnSystemUiVisibilityChangeListener = l;
13056          if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
13057              mParent.recomputeViewAttributes(this);
13058          }
13059      }
13060  
13061      /**
13062       * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down
13063       * the view hierarchy.
13064       */
13065      public void dispatchSystemUiVisibilityChanged(int visibility) {
13066          if (mOnSystemUiVisibilityChangeListener != null) {
13067              mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange(
13068                      visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK);
13069          }
13070      }
13071  
13072      void updateLocalSystemUiVisibility(int localValue, int localChanges) {
13073          int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges);
13074          if (val != mSystemUiVisibility) {
13075              setSystemUiVisibility(val);
13076          }
13077      }
13078  
13079      /**
13080       * Creates an image that the system displays during the drag and drop
13081       * operation. This is called a &quot;drag shadow&quot;. The default implementation
13082       * for a DragShadowBuilder based on a View returns an image that has exactly the same
13083       * appearance as the given View. The default also positions the center of the drag shadow
13084       * directly under the touch point. If no View is provided (the constructor with no parameters
13085       * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and
13086       * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the
13087       * default is an invisible drag shadow.
13088       * <p>
13089       * You are not required to use the View you provide to the constructor as the basis of the
13090       * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw
13091       * anything you want as the drag shadow.
13092       * </p>
13093       * <p>
13094       *  You pass a DragShadowBuilder object to the system when you start the drag. The system
13095       *  calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the
13096       *  size and position of the drag shadow. It uses this data to construct a
13097       *  {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()}
13098       *  so that your application can draw the shadow image in the Canvas.
13099       * </p>
13100       *
13101       * <div class="special reference">
13102       * <h3>Developer Guides</h3>
13103       * <p>For a guide to implementing drag and drop features, read the
13104       * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p>
13105       * </div>
13106       */
13107      public static class DragShadowBuilder {
13108          private final WeakReference<View> mView;
13109  
13110          /**
13111           * Constructs a shadow image builder based on a View. By default, the resulting drag
13112           * shadow will have the same appearance and dimensions as the View, with the touch point
13113           * over the center of the View.
13114           * @param view A View. Any View in scope can be used.
13115           */
13116          public DragShadowBuilder(View view) {
13117              mView = new WeakReference<View>(view);
13118          }
13119  
13120          /**
13121           * Construct a shadow builder object with no associated View.  This
13122           * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)}
13123           * and {@link #onDrawShadow(Canvas)} methods are also overridden in order
13124           * to supply the drag shadow's dimensions and appearance without
13125           * reference to any View object. If they are not overridden, then the result is an
13126           * invisible drag shadow.
13127           */
13128          public DragShadowBuilder() {
13129              mView = new WeakReference<View>(null);
13130          }
13131  
13132          /**
13133           * Returns the View object that had been passed to the
13134           * {@link #View.DragShadowBuilder(View)}
13135           * constructor.  If that View parameter was {@code null} or if the
13136           * {@link #View.DragShadowBuilder()}
13137           * constructor was used to instantiate the builder object, this method will return
13138           * null.
13139           *
13140           * @return The View object associate with this builder object.
13141           */
13142          @SuppressWarnings({"JavadocReference"})
13143          final public View getView() {
13144              return mView.get();
13145          }
13146  
13147          /**
13148           * Provides the metrics for the shadow image. These include the dimensions of
13149           * the shadow image, and the point within that shadow that should
13150           * be centered under the touch location while dragging.
13151           * <p>
13152           * The default implementation sets the dimensions of the shadow to be the
13153           * same as the dimensions of the View itself and centers the shadow under
13154           * the touch point.
13155           * </p>
13156           *
13157           * @param shadowSize A {@link android.graphics.Point} containing the width and height
13158           * of the shadow image. Your application must set {@link android.graphics.Point#x} to the
13159           * desired width and must set {@link android.graphics.Point#y} to the desired height of the
13160           * image.
13161           *
13162           * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the
13163           * shadow image that should be underneath the touch point during the drag and drop
13164           * operation. Your application must set {@link android.graphics.Point#x} to the
13165           * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position.
13166           */
13167          public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) {
13168              final View view = mView.get();
13169              if (view != null) {
13170                  shadowSize.set(view.getWidth(), view.getHeight());
13171                  shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2);
13172              } else {
13173                  Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view");
13174              }
13175          }
13176  
13177          /**
13178           * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object
13179           * based on the dimensions it received from the
13180           * {@link #onProvideShadowMetrics(Point, Point)} callback.
13181           *
13182           * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image.
13183           */
13184          public void onDrawShadow(Canvas canvas) {
13185              final View view = mView.get();
13186              if (view != null) {
13187                  view.draw(canvas);
13188              } else {
13189                  Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view");
13190              }
13191          }
13192      }
13193  
13194      /**
13195       * Starts a drag and drop operation. When your application calls this method, it passes a
13196       * {@link android.view.View.DragShadowBuilder} object to the system. The
13197       * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)}
13198       * to get metrics for the drag shadow, and then calls the object's
13199       * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself.
13200       * <p>
13201       *  Once the system has the drag shadow, it begins the drag and drop operation by sending
13202       *  drag events to all the View objects in your application that are currently visible. It does
13203       *  this either by calling the View object's drag listener (an implementation of
13204       *  {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the
13205       *  View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method.
13206       *  Both are passed a {@link android.view.DragEvent} object that has a
13207       *  {@link android.view.DragEvent#getAction()} value of
13208       *  {@link android.view.DragEvent#ACTION_DRAG_STARTED}.
13209       * </p>
13210       * <p>
13211       * Your application can invoke startDrag() on any attached View object. The View object does not
13212       * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to
13213       * be related to the View the user selected for dragging.
13214       * </p>
13215       * @param data A {@link android.content.ClipData} object pointing to the data to be
13216       * transferred by the drag and drop operation.
13217       * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the
13218       * drag shadow.
13219       * @param myLocalState An {@link java.lang.Object} containing local data about the drag and
13220       * drop operation. This Object is put into every DragEvent object sent by the system during the
13221       * current drag.
13222       * <p>
13223       * myLocalState is a lightweight mechanism for the sending information from the dragged View
13224       * to the target Views. For example, it can contain flags that differentiate between a
13225       * a copy operation and a move operation.
13226       * </p>
13227       * @param flags Flags that control the drag and drop operation. No flags are currently defined,
13228       * so the parameter should be set to 0.
13229       * @return {@code true} if the method completes successfully, or
13230       * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to
13231       * do a drag, and so no drag operation is in progress.
13232       */
13233      public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder,
13234              Object myLocalState, int flags) {
13235          if (ViewDebug.DEBUG_DRAG) {
13236              Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags);
13237          }
13238          boolean okay = false;
13239  
13240          Point shadowSize = new Point();
13241          Point shadowTouchPoint = new Point();
13242          shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint);
13243  
13244          if ((shadowSize.x < 0) || (shadowSize.y < 0) ||
13245                  (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) {
13246              throw new IllegalStateException("Drag shadow dimensions must not be negative");
13247          }
13248  
13249          if (ViewDebug.DEBUG_DRAG) {
13250              Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y
13251                      + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y);
13252          }
13253          Surface surface = new Surface();
13254          try {
13255              IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow,
13256                      flags, shadowSize.x, shadowSize.y, surface);
13257              if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token
13258                      + " surface=" + surface);
13259              if (token != null) {
13260                  Canvas canvas = surface.lockCanvas(null);
13261                  try {
13262                      canvas.drawColor(0, PorterDuff.Mode.CLEAR);
13263                      shadowBuilder.onDrawShadow(canvas);
13264                  } finally {
13265                      surface.unlockCanvasAndPost(canvas);
13266                  }
13267  
13268                  final ViewRootImpl root = getViewRootImpl();
13269  
13270                  // Cache the local state object for delivery with DragEvents
13271                  root.setLocalDragState(myLocalState);
13272  
13273                  // repurpose 'shadowSize' for the last touch point
13274                  root.getLastTouchPoint(shadowSize);
13275  
13276                  okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token,
13277                          shadowSize.x, shadowSize.y,
13278                          shadowTouchPoint.x, shadowTouchPoint.y, data);
13279                  if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay);
13280  
13281                  // Off and running!  Release our local surface instance; the drag
13282                  // shadow surface is now managed by the system process.
13283                  surface.release();
13284              }
13285          } catch (Exception e) {
13286              Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e);
13287              surface.destroy();
13288          }
13289  
13290          return okay;
13291      }
13292  
13293      /**
13294       * Handles drag events sent by the system following a call to
13295       * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}.
13296       *<p>
13297       * When the system calls this method, it passes a
13298       * {@link android.view.DragEvent} object. A call to
13299       * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined
13300       * in DragEvent. The method uses these to determine what is happening in the drag and drop
13301       * operation.
13302       * @param event The {@link android.view.DragEvent} sent by the system.
13303       * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined
13304       * in DragEvent, indicating the type of drag event represented by this object.
13305       * @return {@code true} if the method was successful, otherwise {@code false}.
13306       * <p>
13307       *  The method should return {@code true} in response to an action type of
13308       *  {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current
13309       *  operation.
13310       * </p>
13311       * <p>
13312       *  The method should also return {@code true} in response to an action type of
13313       *  {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or
13314       *  {@code false} if it didn't.
13315       * </p>
13316       */
13317      public boolean onDragEvent(DragEvent event) {
13318          return false;
13319      }
13320  
13321      /**
13322       * Detects if this View is enabled and has a drag event listener.
13323       * If both are true, then it calls the drag event listener with the
13324       * {@link android.view.DragEvent} it received. If the drag event listener returns
13325       * {@code true}, then dispatchDragEvent() returns {@code true}.
13326       * <p>
13327       * For all other cases, the method calls the
13328       * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler
13329       * method and returns its result.
13330       * </p>
13331       * <p>
13332       * This ensures that a drag event is always consumed, even if the View does not have a drag
13333       * event listener. However, if the View has a listener and the listener returns true, then
13334       * onDragEvent() is not called.
13335       * </p>
13336       */
13337      public boolean dispatchDragEvent(DragEvent event) {
13338          //noinspection SimplifiableIfStatement
13339          if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
13340                  && mOnDragListener.onDrag(this, event)) {
13341              return true;
13342          }
13343          return onDragEvent(event);
13344      }
13345  
13346      boolean canAcceptDrag() {
13347          return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0;
13348      }
13349  
13350      /**
13351       * This needs to be a better API (NOT ON VIEW) before it is exposed.  If
13352       * it is ever exposed at all.
13353       * @hide
13354       */
13355      public void onCloseSystemDialogs(String reason) {
13356      }
13357  
13358      /**
13359       * Given a Drawable whose bounds have been set to draw into this view,
13360       * update a Region being computed for
13361       * {@link #gatherTransparentRegion(android.graphics.Region)} so
13362       * that any non-transparent parts of the Drawable are removed from the
13363       * given transparent region.
13364       *
13365       * @param dr The Drawable whose transparency is to be applied to the region.
13366       * @param region A Region holding the current transparency information,
13367       * where any parts of the region that are set are considered to be
13368       * transparent.  On return, this region will be modified to have the
13369       * transparency information reduced by the corresponding parts of the
13370       * Drawable that are not transparent.
13371       * {@hide}
13372       */
13373      public void applyDrawableToTransparentRegion(Drawable dr, Region region) {
13374          if (DBG) {
13375              Log.i("View", "Getting transparent region for: " + this);
13376          }
13377          final Region r = dr.getTransparentRegion();
13378          final Rect db = dr.getBounds();
13379          final AttachInfo attachInfo = mAttachInfo;
13380          if (r != null && attachInfo != null) {
13381              final int w = getRight()-getLeft();
13382              final int h = getBottom()-getTop();
13383              if (db.left > 0) {
13384                  //Log.i("VIEW", "Drawable left " + db.left + " > view 0");
13385                  r.op(0, 0, db.left, h, Region.Op.UNION);
13386              }
13387              if (db.right < w) {
13388                  //Log.i("VIEW", "Drawable right " + db.right + " < view " + w);
13389                  r.op(db.right, 0, w, h, Region.Op.UNION);
13390              }
13391              if (db.top > 0) {
13392                  //Log.i("VIEW", "Drawable top " + db.top + " > view 0");
13393                  r.op(0, 0, w, db.top, Region.Op.UNION);
13394              }
13395              if (db.bottom < h) {
13396                  //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h);
13397                  r.op(0, db.bottom, w, h, Region.Op.UNION);
13398              }
13399              final int[] location = attachInfo.mTransparentLocation;
13400              getLocationInWindow(location);
13401              r.translate(location[0], location[1]);
13402              region.op(r, Region.Op.INTERSECT);
13403          } else {
13404              region.op(db, Region.Op.DIFFERENCE);
13405          }
13406      }
13407  
13408      private void checkForLongClick(int delayOffset) {
13409          if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) {
13410              mHasPerformedLongPress = false;
13411  
13412              if (mPendingCheckForLongPress == null) {
13413                  mPendingCheckForLongPress = new CheckForLongPress();
13414              }
13415              mPendingCheckForLongPress.rememberWindowAttachCount();
13416              postDelayed(mPendingCheckForLongPress,
13417                      ViewConfiguration.getLongPressTimeout() - delayOffset);
13418          }
13419      }
13420  
13421      /**
13422       * Inflate a view from an XML resource.  This convenience method wraps the {@link
13423       * LayoutInflater} class, which provides a full range of options for view inflation.
13424       *
13425       * @param context The Context object for your activity or application.
13426       * @param resource The resource ID to inflate
13427       * @param root A view group that will be the parent.  Used to properly inflate the
13428       * layout_* parameters.
13429       * @see LayoutInflater
13430       */
13431      public static View inflate(Context context, int resource, ViewGroup root) {
13432          LayoutInflater factory = LayoutInflater.from(context);
13433          return factory.inflate(resource, root);
13434      }
13435  
13436      /**
13437       * Scroll the view with standard behavior for scrolling beyond the normal
13438       * content boundaries. Views that call this method should override
13439       * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the
13440       * results of an over-scroll operation.
13441       *
13442       * Views can use this method to handle any touch or fling-based scrolling.
13443       *
13444       * @param deltaX Change in X in pixels
13445       * @param deltaY Change in Y in pixels
13446       * @param scrollX Current X scroll value in pixels before applying deltaX
13447       * @param scrollY Current Y scroll value in pixels before applying deltaY
13448       * @param scrollRangeX Maximum content scroll range along the X axis
13449       * @param scrollRangeY Maximum content scroll range along the Y axis
13450       * @param maxOverScrollX Number of pixels to overscroll by in either direction
13451       *          along the X axis.
13452       * @param maxOverScrollY Number of pixels to overscroll by in either direction
13453       *          along the Y axis.
13454       * @param isTouchEvent true if this scroll operation is the result of a touch event.
13455       * @return true if scrolling was clamped to an over-scroll boundary along either
13456       *          axis, false otherwise.
13457       */
13458      @SuppressWarnings({"UnusedParameters"})
13459      protected boolean overScrollBy(int deltaX, int deltaY,
13460              int scrollX, int scrollY,
13461              int scrollRangeX, int scrollRangeY,
13462              int maxOverScrollX, int maxOverScrollY,
13463              boolean isTouchEvent) {
13464          final int overScrollMode = mOverScrollMode;
13465          final boolean canScrollHorizontal =
13466                  computeHorizontalScrollRange() > computeHorizontalScrollExtent();
13467          final boolean canScrollVertical =
13468                  computeVerticalScrollRange() > computeVerticalScrollExtent();
13469          final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS ||
13470                  (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal);
13471          final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS ||
13472                  (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical);
13473  
13474          int newScrollX = scrollX + deltaX;
13475          if (!overScrollHorizontal) {
13476              maxOverScrollX = 0;
13477          }
13478  
13479          int newScrollY = scrollY + deltaY;
13480          if (!overScrollVertical) {
13481              maxOverScrollY = 0;
13482          }
13483  
13484          // Clamp values if at the limits and record
13485          final int left = -maxOverScrollX;
13486          final int right = maxOverScrollX + scrollRangeX;
13487          final int top = -maxOverScrollY;
13488          final int bottom = maxOverScrollY + scrollRangeY;
13489  
13490          boolean clampedX = false;
13491          if (newScrollX > right) {
13492              newScrollX = right;
13493              clampedX = true;
13494          } else if (newScrollX < left) {
13495              newScrollX = left;
13496              clampedX = true;
13497          }
13498  
13499          boolean clampedY = false;
13500          if (newScrollY > bottom) {
13501              newScrollY = bottom;
13502              clampedY = true;
13503          } else if (newScrollY < top) {
13504              newScrollY = top;
13505              clampedY = true;
13506          }
13507  
13508          onOverScrolled(newScrollX, newScrollY, clampedX, clampedY);
13509  
13510          return clampedX || clampedY;
13511      }
13512  
13513      /**
13514       * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to
13515       * respond to the results of an over-scroll operation.
13516       *
13517       * @param scrollX New X scroll value in pixels
13518       * @param scrollY New Y scroll value in pixels
13519       * @param clampedX True if scrollX was clamped to an over-scroll boundary
13520       * @param clampedY True if scrollY was clamped to an over-scroll boundary
13521       */
13522      protected void onOverScrolled(int scrollX, int scrollY,
13523              boolean clampedX, boolean clampedY) {
13524          // Intentionally empty.
13525      }
13526  
13527      /**
13528       * Returns the over-scroll mode for this view. The result will be
13529       * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}
13530       * (allow over-scrolling only if the view content is larger than the container),
13531       * or {@link #OVER_SCROLL_NEVER}.
13532       *
13533       * @return This view's over-scroll mode.
13534       */
13535      public int getOverScrollMode() {
13536          return mOverScrollMode;
13537      }
13538  
13539      /**
13540       * Set the over-scroll mode for this view. Valid over-scroll modes are
13541       * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}
13542       * (allow over-scrolling only if the view content is larger than the container),
13543       * or {@link #OVER_SCROLL_NEVER}.
13544       *
13545       * Setting the over-scroll mode of a view will have an effect only if the
13546       * view is capable of scrolling.
13547       *
13548       * @param overScrollMode The new over-scroll mode for this view.
13549       */
13550      public void setOverScrollMode(int overScrollMode) {
13551          if (overScrollMode != OVER_SCROLL_ALWAYS &&
13552                  overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS &&
13553                  overScrollMode != OVER_SCROLL_NEVER) {
13554              throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode);
13555          }
13556          mOverScrollMode = overScrollMode;
13557      }
13558  
13559      /**
13560       * Gets a scale factor that determines the distance the view should scroll
13561       * vertically in response to {@link MotionEvent#ACTION_SCROLL}.
13562       * @return The vertical scroll scale factor.
13563       * @hide
13564       */
13565      protected float getVerticalScrollFactor() {
13566          if (mVerticalScrollFactor == 0) {
13567              TypedValue outValue = new TypedValue();
13568              if (!mContext.getTheme().resolveAttribute(
13569                      com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) {
13570                  throw new IllegalStateException(
13571                          "Expected theme to define listPreferredItemHeight.");
13572              }
13573              mVerticalScrollFactor = outValue.getDimension(
13574                      mContext.getResources().getDisplayMetrics());
13575          }
13576          return mVerticalScrollFactor;
13577      }
13578  
13579      /**
13580       * Gets a scale factor that determines the distance the view should scroll
13581       * horizontally in response to {@link MotionEvent#ACTION_SCROLL}.
13582       * @return The horizontal scroll scale factor.
13583       * @hide
13584       */
13585      protected float getHorizontalScrollFactor() {
13586          // TODO: Should use something else.
13587          return getVerticalScrollFactor();
13588      }
13589  
13590      /**
13591       * Return the value specifying the text direction or policy that was set with
13592       * {@link #setTextDirection(int)}.
13593       *
13594       * @return the defined text direction. It can be one of:
13595       *
13596       * {@link #TEXT_DIRECTION_INHERIT},
13597       * {@link #TEXT_DIRECTION_FIRST_STRONG}
13598       * {@link #TEXT_DIRECTION_ANY_RTL},
13599       * {@link #TEXT_DIRECTION_LTR},
13600       * {@link #TEXT_DIRECTION_RTL},
13601       *
13602       * @hide
13603       */
13604      public int getTextDirection() {
13605          return mTextDirection;
13606      }
13607  
13608      /**
13609       * Set the text direction.
13610       *
13611       * @param textDirection the direction to set. Should be one of:
13612       *
13613       * {@link #TEXT_DIRECTION_INHERIT},
13614       * {@link #TEXT_DIRECTION_FIRST_STRONG}
13615       * {@link #TEXT_DIRECTION_ANY_RTL},
13616       * {@link #TEXT_DIRECTION_LTR},
13617       * {@link #TEXT_DIRECTION_RTL},
13618       *
13619       * @hide
13620       */
13621      public void setTextDirection(int textDirection) {
13622          if (textDirection != mTextDirection) {
13623              mTextDirection = textDirection;
13624              resetResolvedTextDirection();
13625              requestLayout();
13626          }
13627      }
13628  
13629      /**
13630       * Return the resolved text direction.
13631       *
13632       * @return the resolved text direction. Return one of:
13633       *
13634       * {@link #TEXT_DIRECTION_FIRST_STRONG}
13635       * {@link #TEXT_DIRECTION_ANY_RTL},
13636       * {@link #TEXT_DIRECTION_LTR},
13637       * {@link #TEXT_DIRECTION_RTL},
13638       *
13639       * @hide
13640       */
13641      public int getResolvedTextDirection() {
13642          if (mResolvedTextDirection == TEXT_DIRECTION_INHERIT) {
13643              resolveTextDirection();
13644          }
13645          return mResolvedTextDirection;
13646      }
13647  
13648      /**
13649       * Resolve the text direction.
13650       *
13651       * @hide
13652       */
13653      protected void resolveTextDirection() {
13654          if (mTextDirection != TEXT_DIRECTION_INHERIT) {
13655              mResolvedTextDirection = mTextDirection;
13656              return;
13657          }
13658          if (mParent != null && mParent instanceof ViewGroup) {
13659              mResolvedTextDirection = ((ViewGroup) mParent).getResolvedTextDirection();
13660              return;
13661          }
13662          mResolvedTextDirection = TEXT_DIRECTION_FIRST_STRONG;
13663      }
13664  
13665      /**
13666       * Reset resolved text direction. Will be resolved during a call to getResolvedTextDirection().
13667       *
13668       * @hide
13669       */
13670      protected void resetResolvedTextDirection() {
13671          mResolvedTextDirection = TEXT_DIRECTION_INHERIT;
13672      }
13673  
13674      //
13675      // Properties
13676      //
13677      /**
13678       * A Property wrapper around the <code>alpha</code> functionality handled by the
13679       * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods.
13680       */
13681      public static Property<View, Float> ALPHA = new FloatProperty<View>("alpha") {
13682          @Override
13683          public void setValue(View object, float value) {
13684              object.setAlpha(value);
13685          }
13686  
13687          @Override
13688          public Float get(View object) {
13689              return object.getAlpha();
13690          }
13691      };
13692  
13693      /**
13694       * A Property wrapper around the <code>translationX</code> functionality handled by the
13695       * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods.
13696       */
13697      public static Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") {
13698          @Override
13699          public void setValue(View object, float value) {
13700              object.setTranslationX(value);
13701          }
13702  
13703                  @Override
13704          public Float get(View object) {
13705              return object.getTranslationX();
13706          }
13707      };
13708  
13709      /**
13710       * A Property wrapper around the <code>translationY</code> functionality handled by the
13711       * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods.
13712       */
13713      public static Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") {
13714          @Override
13715          public void setValue(View object, float value) {
13716              object.setTranslationY(value);
13717          }
13718  
13719          @Override
13720          public Float get(View object) {
13721              return object.getTranslationY();
13722          }
13723      };
13724  
13725      /**
13726       * A Property wrapper around the <code>x</code> functionality handled by the
13727       * {@link View#setX(float)} and {@link View#getX()} methods.
13728       */
13729      public static Property<View, Float> X = new FloatProperty<View>("x") {
13730          @Override
13731          public void setValue(View object, float value) {
13732              object.setX(value);
13733          }
13734  
13735          @Override
13736          public Float get(View object) {
13737              return object.getX();
13738          }
13739      };
13740  
13741      /**
13742       * A Property wrapper around the <code>y</code> functionality handled by the
13743       * {@link View#setY(float)} and {@link View#getY()} methods.
13744       */
13745      public static Property<View, Float> Y = new FloatProperty<View>("y") {
13746          @Override
13747          public void setValue(View object, float value) {
13748              object.setY(value);
13749          }
13750  
13751          @Override
13752          public Float get(View object) {
13753              return object.getY();
13754          }
13755      };
13756  
13757      /**
13758       * A Property wrapper around the <code>rotation</code> functionality handled by the
13759       * {@link View#setRotation(float)} and {@link View#getRotation()} methods.
13760       */
13761      public static Property<View, Float> ROTATION = new FloatProperty<View>("rotation") {
13762          @Override
13763          public void setValue(View object, float value) {
13764              object.setRotation(value);
13765          }
13766  
13767          @Override
13768          public Float get(View object) {
13769              return object.getRotation();
13770          }
13771      };
13772  
13773      /**
13774       * A Property wrapper around the <code>rotationX</code> functionality handled by the
13775       * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods.
13776       */
13777      public static Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") {
13778          @Override
13779          public void setValue(View object, float value) {
13780              object.setRotationX(value);
13781          }
13782  
13783          @Override
13784          public Float get(View object) {
13785              return object.getRotationX();
13786          }
13787      };
13788  
13789      /**
13790       * A Property wrapper around the <code>rotationY</code> functionality handled by the
13791       * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods.
13792       */
13793      public static Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") {
13794          @Override
13795          public void setValue(View object, float value) {
13796              object.setRotationY(value);
13797          }
13798  
13799          @Override
13800          public Float get(View object) {
13801              return object.getRotationY();
13802          }
13803      };
13804  
13805      /**
13806       * A Property wrapper around the <code>scaleX</code> functionality handled by the
13807       * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods.
13808       */
13809      public static Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") {
13810          @Override
13811          public void setValue(View object, float value) {
13812              object.setScaleX(value);
13813          }
13814  
13815          @Override
13816          public Float get(View object) {
13817              return object.getScaleX();
13818          }
13819      };
13820  
13821      /**
13822       * A Property wrapper around the <code>scaleY</code> functionality handled by the
13823       * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods.
13824       */
13825      public static Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") {
13826          @Override
13827          public void setValue(View object, float value) {
13828              object.setScaleY(value);
13829          }
13830  
13831          @Override
13832          public Float get(View object) {
13833              return object.getScaleY();
13834          }
13835      };
13836  
13837      /**
13838       * A MeasureSpec encapsulates the layout requirements passed from parent to child.
13839       * Each MeasureSpec represents a requirement for either the width or the height.
13840       * A MeasureSpec is comprised of a size and a mode. There are three possible
13841       * modes:
13842       * <dl>
13843       * <dt>UNSPECIFIED</dt>
13844       * <dd>
13845       * The parent has not imposed any constraint on the child. It can be whatever size
13846       * it wants.
13847       * </dd>
13848       *
13849       * <dt>EXACTLY</dt>
13850       * <dd>
13851       * The parent has determined an exact size for the child. The child is going to be
13852       * given those bounds regardless of how big it wants to be.
13853       * </dd>
13854       *
13855       * <dt>AT_MOST</dt>
13856       * <dd>
13857       * The child can be as large as it wants up to the specified size.
13858       * </dd>
13859       * </dl>
13860       *
13861       * MeasureSpecs are implemented as ints to reduce object allocation. This class
13862       * is provided to pack and unpack the &lt;size, mode&gt; tuple into the int.
13863       */
13864      public static class MeasureSpec {
13865          private static final int MODE_SHIFT = 30;
13866          private static final int MODE_MASK  = 0x3 << MODE_SHIFT;
13867  
13868          /**
13869           * Measure specification mode: The parent has not imposed any constraint
13870           * on the child. It can be whatever size it wants.
13871           */
13872          public static final int UNSPECIFIED = 0 << MODE_SHIFT;
13873  
13874          /**
13875           * Measure specification mode: The parent has determined an exact size
13876           * for the child. The child is going to be given those bounds regardless
13877           * of how big it wants to be.
13878           */
13879          public static final int EXACTLY     = 1 << MODE_SHIFT;
13880  
13881          /**
13882           * Measure specification mode: The child can be as large as it wants up
13883           * to the specified size.
13884           */
13885          public static final int AT_MOST     = 2 << MODE_SHIFT;
13886  
13887          /**
13888           * Creates a measure specification based on the supplied size and mode.
13889           *
13890           * The mode must always be one of the following:
13891           * <ul>
13892           *  <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li>
13893           *  <li>{@link android.view.View.MeasureSpec#EXACTLY}</li>
13894           *  <li>{@link android.view.View.MeasureSpec#AT_MOST}</li>
13895           * </ul>
13896           *
13897           * @param size the size of the measure specification
13898           * @param mode the mode of the measure specification
13899           * @return the measure specification based on size and mode
13900           */
13901          public static int makeMeasureSpec(int size, int mode) {
13902              return size + mode;
13903          }
13904  
13905          /**
13906           * Extracts the mode from the supplied measure specification.
13907           *
13908           * @param measureSpec the measure specification to extract the mode from
13909           * @return {@link android.view.View.MeasureSpec#UNSPECIFIED},
13910           *         {@link android.view.View.MeasureSpec#AT_MOST} or
13911           *         {@link android.view.View.MeasureSpec#EXACTLY}
13912           */
13913          public static int getMode(int measureSpec) {
13914              return (measureSpec & MODE_MASK);
13915          }
13916  
13917          /**
13918           * Extracts the size from the supplied measure specification.
13919           *
13920           * @param measureSpec the measure specification to extract the size from
13921           * @return the size in pixels defined in the supplied measure specification
13922           */
13923          public static int getSize(int measureSpec) {
13924              return (measureSpec & ~MODE_MASK);
13925          }
13926  
13927          /**
13928           * Returns a String representation of the specified measure
13929           * specification.
13930           *
13931           * @param measureSpec the measure specification to convert to a String
13932           * @return a String with the following format: "MeasureSpec: MODE SIZE"
13933           */
13934          public static String toString(int measureSpec) {
13935              int mode = getMode(measureSpec);
13936              int size = getSize(measureSpec);
13937  
13938              StringBuilder sb = new StringBuilder("MeasureSpec: ");
13939  
13940              if (mode == UNSPECIFIED)
13941                  sb.append("UNSPECIFIED ");
13942              else if (mode == EXACTLY)
13943                  sb.append("EXACTLY ");
13944              else if (mode == AT_MOST)
13945                  sb.append("AT_MOST ");
13946              else
13947                  sb.append(mode).append(" ");
13948  
13949              sb.append(size);
13950              return sb.toString();
13951          }
13952      }
13953  
13954      class CheckForLongPress implements Runnable {
13955  
13956          private int mOriginalWindowAttachCount;
13957  
13958          public void run() {
13959              if (isPressed() && (mParent != null)
13960                      && mOriginalWindowAttachCount == mWindowAttachCount) {
13961                  if (performLongClick()) {
13962                      mHasPerformedLongPress = true;
13963                  }
13964              }
13965          }
13966  
13967          public void rememberWindowAttachCount() {
13968              mOriginalWindowAttachCount = mWindowAttachCount;
13969          }
13970      }
13971  
13972      private final class CheckForTap implements Runnable {
13973          public void run() {
13974              mPrivateFlags &= ~PREPRESSED;
13975              mPrivateFlags |= PRESSED;
13976              refreshDrawableState();
13977              checkForLongClick(ViewConfiguration.getTapTimeout());
13978          }
13979      }
13980  
13981      private final class PerformClick implements Runnable {
13982          public void run() {
13983              performClick();
13984          }
13985      }
13986  
13987      /** @hide */
13988      public void hackTurnOffWindowResizeAnim(boolean off) {
13989          mAttachInfo.mTurnOffWindowResizeAnim = off;
13990      }
13991  
13992      /**
13993       * This method returns a ViewPropertyAnimator object, which can be used to animate
13994       * specific properties on this View.
13995       *
13996       * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View.
13997       */
13998      public ViewPropertyAnimator animate() {
13999          if (mAnimator == null) {
14000              mAnimator = new ViewPropertyAnimator(this);
14001          }
14002          return mAnimator;
14003      }
14004  
14005      /**
14006       * Interface definition for a callback to be invoked when a key event is
14007       * dispatched to this view. The callback will be invoked before the key
14008       * event is given to the view.
14009       */
14010      public interface OnKeyListener {
14011          /**
14012           * Called when a key is dispatched to a view. This allows listeners to
14013           * get a chance to respond before the target view.
14014           *
14015           * @param v The view the key has been dispatched to.
14016           * @param keyCode The code for the physical key that was pressed
14017           * @param event The KeyEvent object containing full information about
14018           *        the event.
14019           * @return True if the listener has consumed the event, false otherwise.
14020           */
14021          boolean onKey(View v, int keyCode, KeyEvent event);
14022      }
14023  
14024      /**
14025       * Interface definition for a callback to be invoked when a touch event is
14026       * dispatched to this view. The callback will be invoked before the touch
14027       * event is given to the view.
14028       */
14029      public interface OnTouchListener {
14030          /**
14031           * Called when a touch event is dispatched to a view. This allows listeners to
14032           * get a chance to respond before the target view.
14033           *
14034           * @param v The view the touch event has been dispatched to.
14035           * @param event The MotionEvent object containing full information about
14036           *        the event.
14037           * @return True if the listener has consumed the event, false otherwise.
14038           */
14039          boolean onTouch(View v, MotionEvent event);
14040      }
14041  
14042      /**
14043       * Interface definition for a callback to be invoked when a hover event is
14044       * dispatched to this view. The callback will be invoked before the hover
14045       * event is given to the view.
14046       */
14047      public interface OnHoverListener {
14048          /**
14049           * Called when a hover event is dispatched to a view. This allows listeners to
14050           * get a chance to respond before the target view.
14051           *
14052           * @param v The view the hover event has been dispatched to.
14053           * @param event The MotionEvent object containing full information about
14054           *        the event.
14055           * @return True if the listener has consumed the event, false otherwise.
14056           */
14057          boolean onHover(View v, MotionEvent event);
14058      }
14059  
14060      /**
14061       * Interface definition for a callback to be invoked when a generic motion event is
14062       * dispatched to this view. The callback will be invoked before the generic motion
14063       * event is given to the view.
14064       */
14065      public interface OnGenericMotionListener {
14066          /**
14067           * Called when a generic motion event is dispatched to a view. This allows listeners to
14068           * get a chance to respond before the target view.
14069           *
14070           * @param v The view the generic motion event has been dispatched to.
14071           * @param event The MotionEvent object containing full information about
14072           *        the event.
14073           * @return True if the listener has consumed the event, false otherwise.
14074           */
14075          boolean onGenericMotion(View v, MotionEvent event);
14076      }
14077  
14078      /**
14079       * Interface definition for a callback to be invoked when a view has been clicked and held.
14080       */
14081      public interface OnLongClickListener {
14082          /**
14083           * Called when a view has been clicked and held.
14084           *
14085           * @param v The view that was clicked and held.
14086           *
14087           * @return true if the callback consumed the long click, false otherwise.
14088           */
14089          boolean onLongClick(View v);
14090      }
14091  
14092      /**
14093       * Interface definition for a callback to be invoked when a drag is being dispatched
14094       * to this view.  The callback will be invoked before the hosting view's own
14095       * onDrag(event) method.  If the listener wants to fall back to the hosting view's
14096       * onDrag(event) behavior, it should return 'false' from this callback.
14097       *
14098       * <div class="special reference">
14099       * <h3>Developer Guides</h3>
14100       * <p>For a guide to implementing drag and drop features, read the
14101       * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p>
14102       * </div>
14103       */
14104      public interface OnDragListener {
14105          /**
14106           * Called when a drag event is dispatched to a view. This allows listeners
14107           * to get a chance to override base View behavior.
14108           *
14109           * @param v The View that received the drag event.
14110           * @param event The {@link android.view.DragEvent} object for the drag event.
14111           * @return {@code true} if the drag event was handled successfully, or {@code false}
14112           * if the drag event was not handled. Note that {@code false} will trigger the View
14113           * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler.
14114           */
14115          boolean onDrag(View v, DragEvent event);
14116      }
14117  
14118      /**
14119       * Interface definition for a callback to be invoked when the focus state of
14120       * a view changed.
14121       */
14122      public interface OnFocusChangeListener {
14123          /**
14124           * Called when the focus state of a view has changed.
14125           *
14126           * @param v The view whose state has changed.
14127           * @param hasFocus The new focus state of v.
14128           */
14129          void onFocusChange(View v, boolean hasFocus);
14130      }
14131  
14132      /**
14133       * Interface definition for a callback to be invoked when a view is clicked.
14134       */
14135      public interface OnClickListener {
14136          /**
14137           * Called when a view has been clicked.
14138           *
14139           * @param v The view that was clicked.
14140           */
14141          void onClick(View v);
14142      }
14143  
14144      /**
14145       * Interface definition for a callback to be invoked when the context menu
14146       * for this view is being built.
14147       */
14148      public interface OnCreateContextMenuListener {
14149          /**
14150           * Called when the context menu for this view is being built. It is not
14151           * safe to hold onto the menu after this method returns.
14152           *
14153           * @param menu The context menu that is being built
14154           * @param v The view for which the context menu is being built
14155           * @param menuInfo Extra information about the item for which the
14156           *            context menu should be shown. This information will vary
14157           *            depending on the class of v.
14158           */
14159          void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo);
14160      }
14161  
14162      /**
14163       * Interface definition for a callback to be invoked when the status bar changes
14164       * visibility.  This reports <strong>global</strong> changes to the system UI
14165       * state, not just what the application is requesting.
14166       *
14167       * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener)
14168       */
14169      public interface OnSystemUiVisibilityChangeListener {
14170          /**
14171           * Called when the status bar changes visibility because of a call to
14172           * {@link View#setSystemUiVisibility(int)}.
14173           *
14174           * @param visibility  Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or
14175           * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}.  This tells you the
14176           * <strong>global</strong> state of the UI visibility flags, not what your
14177           * app is currently applying.
14178           */
14179          public void onSystemUiVisibilityChange(int visibility);
14180      }
14181  
14182      /**
14183       * Interface definition for a callback to be invoked when this view is attached
14184       * or detached from its window.
14185       */
14186      public interface OnAttachStateChangeListener {
14187          /**
14188           * Called when the view is attached to a window.
14189           * @param v The view that was attached
14190           */
14191          public void onViewAttachedToWindow(View v);
14192          /**
14193           * Called when the view is detached from a window.
14194           * @param v The view that was detached
14195           */
14196          public void onViewDetachedFromWindow(View v);
14197      }
14198  
14199      private final class UnsetPressedState implements Runnable {
14200          public void run() {
14201              setPressed(false);
14202          }
14203      }
14204  
14205      /**
14206       * Base class for derived classes that want to save and restore their own
14207       * state in {@link android.view.View#onSaveInstanceState()}.
14208       */
14209      public static class BaseSavedState extends AbsSavedState {
14210          /**
14211           * Constructor used when reading from a parcel. Reads the state of the superclass.
14212           *
14213           * @param source
14214           */
14215          public BaseSavedState(Parcel source) {
14216              super(source);
14217          }
14218  
14219          /**
14220           * Constructor called by derived classes when creating their SavedState objects
14221           *
14222           * @param superState The state of the superclass of this view
14223           */
14224          public BaseSavedState(Parcelable superState) {
14225              super(superState);
14226          }
14227  
14228          public static final Parcelable.Creator<BaseSavedState> CREATOR =
14229                  new Parcelable.Creator<BaseSavedState>() {
14230              public BaseSavedState createFromParcel(Parcel in) {
14231                  return new BaseSavedState(in);
14232              }
14233  
14234              public BaseSavedState[] newArray(int size) {
14235                  return new BaseSavedState[size];
14236              }
14237          };
14238      }
14239  
14240      /**
14241       * A set of information given to a view when it is attached to its parent
14242       * window.
14243       */
14244      static class AttachInfo {
14245          interface Callbacks {
14246              void playSoundEffect(int effectId);
14247              boolean performHapticFeedback(int effectId, boolean always);
14248          }
14249  
14250          /**
14251           * InvalidateInfo is used to post invalidate(int, int, int, int) messages
14252           * to a Handler. This class contains the target (View) to invalidate and
14253           * the coordinates of the dirty rectangle.
14254           *
14255           * For performance purposes, this class also implements a pool of up to
14256           * POOL_LIMIT objects that get reused. This reduces memory allocations
14257           * whenever possible.
14258           */
14259          static class InvalidateInfo implements Poolable<InvalidateInfo> {
14260              private static final int POOL_LIMIT = 10;
14261              private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool(
14262                      Pools.finitePool(new PoolableManager<InvalidateInfo>() {
14263                          public InvalidateInfo newInstance() {
14264                              return new InvalidateInfo();
14265                          }
14266  
14267                          public void onAcquired(InvalidateInfo element) {
14268                          }
14269  
14270                          public void onReleased(InvalidateInfo element) {
14271                              element.target = null;
14272                          }
14273                      }, POOL_LIMIT)
14274              );
14275  
14276              private InvalidateInfo mNext;
14277              private boolean mIsPooled;
14278  
14279              View target;
14280  
14281              int left;
14282              int top;
14283              int right;
14284              int bottom;
14285  
14286              public void setNextPoolable(InvalidateInfo element) {
14287                  mNext = element;
14288              }
14289  
14290              public InvalidateInfo getNextPoolable() {
14291                  return mNext;
14292              }
14293  
14294              static InvalidateInfo acquire() {
14295                  return sPool.acquire();
14296              }
14297  
14298              void release() {
14299                  sPool.release(this);
14300              }
14301  
14302              public boolean isPooled() {
14303                  return mIsPooled;
14304              }
14305  
14306              public void setPooled(boolean isPooled) {
14307                  mIsPooled = isPooled;
14308              }
14309          }
14310  
14311          final IWindowSession mSession;
14312  
14313          final IWindow mWindow;
14314  
14315          final IBinder mWindowToken;
14316  
14317          final Callbacks mRootCallbacks;
14318  
14319          HardwareCanvas mHardwareCanvas;
14320  
14321          /**
14322           * The top view of the hierarchy.
14323           */
14324          View mRootView;
14325  
14326          IBinder mPanelParentWindowToken;
14327          Surface mSurface;
14328  
14329          boolean mHardwareAccelerated;
14330          boolean mHardwareAccelerationRequested;
14331          HardwareRenderer mHardwareRenderer;
14332  
14333          /**
14334           * Scale factor used by the compatibility mode
14335           */
14336          float mApplicationScale;
14337  
14338          /**
14339           * Indicates whether the application is in compatibility mode
14340           */
14341          boolean mScalingRequired;
14342  
14343          /**
14344           * If set, ViewAncestor doesn't use its lame animation for when the window resizes.
14345           */
14346          boolean mTurnOffWindowResizeAnim;
14347  
14348          /**
14349           * Left position of this view's window
14350           */
14351          int mWindowLeft;
14352  
14353          /**
14354           * Top position of this view's window
14355           */
14356          int mWindowTop;
14357  
14358          /**
14359           * Indicates whether views need to use 32-bit drawing caches
14360           */
14361          boolean mUse32BitDrawingCache;
14362  
14363          /**
14364           * For windows that are full-screen but using insets to layout inside
14365           * of the screen decorations, these are the current insets for the
14366           * content of the window.
14367           */
14368          final Rect mContentInsets = new Rect();
14369  
14370          /**
14371           * For windows that are full-screen but using insets to layout inside
14372           * of the screen decorations, these are the current insets for the
14373           * actual visible parts of the window.
14374           */
14375          final Rect mVisibleInsets = new Rect();
14376  
14377          /**
14378           * The internal insets given by this window.  This value is
14379           * supplied by the client (through
14380           * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will
14381           * be given to the window manager when changed to be used in laying
14382           * out windows behind it.
14383           */
14384          final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets
14385                  = new ViewTreeObserver.InternalInsetsInfo();
14386  
14387          /**
14388           * All views in the window's hierarchy that serve as scroll containers,
14389           * used to determine if the window can be resized or must be panned
14390           * to adjust for a soft input area.
14391           */
14392          final ArrayList<View> mScrollContainers = new ArrayList<View>();
14393  
14394          final KeyEvent.DispatcherState mKeyDispatchState
14395                  = new KeyEvent.DispatcherState();
14396  
14397          /**
14398           * Indicates whether the view's window currently has the focus.
14399           */
14400          boolean mHasWindowFocus;
14401  
14402          /**
14403           * The current visibility of the window.
14404           */
14405          int mWindowVisibility;
14406  
14407          /**
14408           * Indicates the time at which drawing started to occur.
14409           */
14410          long mDrawingTime;
14411  
14412          /**
14413           * Indicates whether or not ignoring the DIRTY_MASK flags.
14414           */
14415          boolean mIgnoreDirtyState;
14416  
14417          /**
14418           * This flag tracks when the mIgnoreDirtyState flag is set during draw(),
14419           * to avoid clearing that flag prematurely.
14420           */
14421          boolean mSetIgnoreDirtyState = false;
14422  
14423          /**
14424           * Indicates whether the view's window is currently in touch mode.
14425           */
14426          boolean mInTouchMode;
14427  
14428          /**
14429           * Indicates that ViewAncestor should trigger a global layout change
14430           * the next time it performs a traversal
14431           */
14432          boolean mRecomputeGlobalAttributes;
14433  
14434          /**
14435           * Always report new attributes at next traversal.
14436           */
14437          boolean mForceReportNewAttributes;
14438  
14439          /**
14440           * Set during a traveral if any views want to keep the screen on.
14441           */
14442          boolean mKeepScreenOn;
14443  
14444          /**
14445           * Bitwise-or of all of the values that views have passed to setSystemUiVisibility().
14446           */
14447          int mSystemUiVisibility;
14448  
14449          /**
14450           * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener
14451           * attached.
14452           */
14453          boolean mHasSystemUiListeners;
14454  
14455          /**
14456           * Set if the visibility of any views has changed.
14457           */
14458          boolean mViewVisibilityChanged;
14459  
14460          /**
14461           * Set to true if a view has been scrolled.
14462           */
14463          boolean mViewScrollChanged;
14464  
14465          /**
14466           * Global to the view hierarchy used as a temporary for dealing with
14467           * x/y points in the transparent region computations.
14468           */
14469          final int[] mTransparentLocation = new int[2];
14470  
14471          /**
14472           * Global to the view hierarchy used as a temporary for dealing with
14473           * x/y points in the ViewGroup.invalidateChild implementation.
14474           */
14475          final int[] mInvalidateChildLocation = new int[2];
14476  
14477  
14478          /**
14479           * Global to the view hierarchy used as a temporary for dealing with
14480           * x/y location when view is transformed.
14481           */
14482          final float[] mTmpTransformLocation = new float[2];
14483  
14484          /**
14485           * The view tree observer used to dispatch global events like
14486           * layout, pre-draw, touch mode change, etc.
14487           */
14488          final ViewTreeObserver mTreeObserver = new ViewTreeObserver();
14489  
14490          /**
14491           * A Canvas used by the view hierarchy to perform bitmap caching.
14492           */
14493          Canvas mCanvas;
14494  
14495          /**
14496           * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This
14497           * handler can be used to pump events in the UI events queue.
14498           */
14499          final Handler mHandler;
14500  
14501          /**
14502           * Identifier for messages requesting the view to be invalidated.
14503           * Such messages should be sent to {@link #mHandler}.
14504           */
14505          static final int INVALIDATE_MSG = 0x1;
14506  
14507          /**
14508           * Identifier for messages requesting the view to invalidate a region.
14509           * Such messages should be sent to {@link #mHandler}.
14510           */
14511          static final int INVALIDATE_RECT_MSG = 0x2;
14512  
14513          /**
14514           * Temporary for use in computing invalidate rectangles while
14515           * calling up the hierarchy.
14516           */
14517          final Rect mTmpInvalRect = new Rect();
14518  
14519          /**
14520           * Temporary for use in computing hit areas with transformed views
14521           */
14522          final RectF mTmpTransformRect = new RectF();
14523  
14524          /**
14525           * Temporary list for use in collecting focusable descendents of a view.
14526           */
14527          final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24);
14528  
14529          /**
14530           * The id of the window for accessibility purposes.
14531           */
14532          int mAccessibilityWindowId = View.NO_ID;
14533  
14534          /**
14535           * Creates a new set of attachment information with the specified
14536           * events handler and thread.
14537           *
14538           * @param handler the events handler the view must use
14539           */
14540          AttachInfo(IWindowSession session, IWindow window,
14541                  Handler handler, Callbacks effectPlayer) {
14542              mSession = session;
14543              mWindow = window;
14544              mWindowToken = window.asBinder();
14545              mHandler = handler;
14546              mRootCallbacks = effectPlayer;
14547          }
14548      }
14549  
14550      /**
14551       * <p>ScrollabilityCache holds various fields used by a View when scrolling
14552       * is supported. This avoids keeping too many unused fields in most
14553       * instances of View.</p>
14554       */
14555      private static class ScrollabilityCache implements Runnable {
14556  
14557          /**
14558           * Scrollbars are not visible
14559           */
14560          public static final int OFF = 0;
14561  
14562          /**
14563           * Scrollbars are visible
14564           */
14565          public static final int ON = 1;
14566  
14567          /**
14568           * Scrollbars are fading away
14569           */
14570          public static final int FADING = 2;
14571  
14572          public boolean fadeScrollBars;
14573  
14574          public int fadingEdgeLength;
14575          public int scrollBarDefaultDelayBeforeFade;
14576          public int scrollBarFadeDuration;
14577  
14578          public int scrollBarSize;
14579          public ScrollBarDrawable scrollBar;
14580          public float[] interpolatorValues;
14581          public View host;
14582  
14583          public final Paint paint;
14584          public final Matrix matrix;
14585          public Shader shader;
14586  
14587          public final Interpolator scrollBarInterpolator = new Interpolator(1, 2);
14588  
14589          private static final float[] OPAQUE = { 255 };
14590          private static final float[] TRANSPARENT = { 0.0f };
14591  
14592          /**
14593           * When fading should start. This time moves into the future every time
14594           * a new scroll happens. Measured based on SystemClock.uptimeMillis()
14595           */
14596          public long fadeStartTime;
14597  
14598  
14599          /**
14600           * The current state of the scrollbars: ON, OFF, or FADING
14601           */
14602          public int state = OFF;
14603  
14604          private int mLastColor;
14605  
14606          public ScrollabilityCache(ViewConfiguration configuration, View host) {
14607              fadingEdgeLength = configuration.getScaledFadingEdgeLength();
14608              scrollBarSize = configuration.getScaledScrollBarSize();
14609              scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay();
14610              scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration();
14611  
14612              paint = new Paint();
14613              matrix = new Matrix();
14614              // use use a height of 1, and then wack the matrix each time we
14615              // actually use it.
14616              shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP);
14617  
14618              paint.setShader(shader);
14619              paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
14620              this.host = host;
14621          }
14622  
14623          public void setFadeColor(int color) {
14624              if (color != 0 && color != mLastColor) {
14625                  mLastColor = color;
14626                  color |= 0xFF000000;
14627  
14628                  shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000,
14629                          color & 0x00FFFFFF, Shader.TileMode.CLAMP);
14630  
14631                  paint.setShader(shader);
14632                  // Restore the default transfer mode (src_over)
14633                  paint.setXfermode(null);
14634              }
14635          }
14636  
14637          public void run() {
14638              long now = AnimationUtils.currentAnimationTimeMillis();
14639              if (now >= fadeStartTime) {
14640  
14641                  // the animation fades the scrollbars out by changing
14642                  // the opacity (alpha) from fully opaque to fully
14643                  // transparent
14644                  int nextFrame = (int) now;
14645                  int framesCount = 0;
14646  
14647                  Interpolator interpolator = scrollBarInterpolator;
14648  
14649                  // Start opaque
14650                  interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE);
14651  
14652                  // End transparent
14653                  nextFrame += scrollBarFadeDuration;
14654                  interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT);
14655  
14656                  state = FADING;
14657  
14658                  // Kick off the fade animation
14659                  host.invalidate(true);
14660              }
14661          }
14662      }
14663  
14664      /**
14665       * Resuable callback for sending
14666       * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event.
14667       */
14668      private class SendViewScrolledAccessibilityEvent implements Runnable {
14669          public volatile boolean mIsPending;
14670  
14671          public void run() {
14672              sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED);
14673              mIsPending = false;
14674          }
14675      }
14676  
14677      /**
14678       * <p>
14679       * This class represents a delegate that can be registered in a {@link View}
14680       * to enhance accessibility support via composition rather via inheritance.
14681       * It is specifically targeted to widget developers that extend basic View
14682       * classes i.e. classes in package android.view, that would like their
14683       * applications to be backwards compatible.
14684       * </p>
14685       * <p>
14686       * A scenario in which a developer would like to use an accessibility delegate
14687       * is overriding a method introduced in a later API version then the minimal API
14688       * version supported by the application. For example, the method
14689       * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available
14690       * in API version 4 when the accessibility APIs were first introduced. If a
14691       * developer would like his application to run on API version 4 devices (assuming
14692       * all other APIs used by the application are version 4 or lower) and take advantage
14693       * of this method, instead of overriding the method which would break the application's
14694       * backwards compatibility, he can override the corresponding method in this
14695       * delegate and register the delegate in the target View if the API version of
14696       * the system is high enough i.e. the API version is same or higher to the API
14697       * version that introduced
14698       * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}.
14699       * </p>
14700       * <p>
14701       * Here is an example implementation:
14702       * </p>
14703       * <code><pre><p>
14704       * if (Build.VERSION.SDK_INT >= 14) {
14705       *     // If the API version is equal of higher than the version in
14706       *     // which onInitializeAccessibilityNodeInfo was introduced we
14707       *     // register a delegate with a customized implementation.
14708       *     View view = findViewById(R.id.view_id);
14709       *     view.setAccessibilityDelegate(new AccessibilityDelegate() {
14710       *         public void onInitializeAccessibilityNodeInfo(View host,
14711       *                 AccessibilityNodeInfo info) {
14712       *             // Let the default implementation populate the info.
14713       *             super.onInitializeAccessibilityNodeInfo(host, info);
14714       *             // Set some other information.
14715       *             info.setEnabled(host.isEnabled());
14716       *         }
14717       *     });
14718       * }
14719       * </code></pre></p>
14720       * <p>
14721       * This delegate contains methods that correspond to the accessibility methods
14722       * in View. If a delegate has been specified the implementation in View hands
14723       * off handling to the corresponding method in this delegate. The default
14724       * implementation the delegate methods behaves exactly as the corresponding
14725       * method in View for the case of no accessibility delegate been set. Hence,
14726       * to customize the behavior of a View method, clients can override only the
14727       * corresponding delegate method without altering the behavior of the rest
14728       * accessibility related methods of the host view.
14729       * </p>
14730       */
14731      public static class AccessibilityDelegate {
14732  
14733          /**
14734           * Sends an accessibility event of the given type. If accessibility is not
14735           * enabled this method has no effect.
14736           * <p>
14737           * The default implementation behaves as {@link View#sendAccessibilityEvent(int)
14738           *  View#sendAccessibilityEvent(int)} for the case of no accessibility delegate
14739           * been set.
14740           * </p>
14741           *
14742           * @param host The View hosting the delegate.
14743           * @param eventType The type of the event to send.
14744           *
14745           * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int)
14746           */
14747          public void sendAccessibilityEvent(View host, int eventType) {
14748              host.sendAccessibilityEventInternal(eventType);
14749          }
14750  
14751          /**
14752           * Sends an accessibility event. This method behaves exactly as
14753           * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an
14754           * empty {@link AccessibilityEvent} and does not perform a check whether
14755           * accessibility is enabled.
14756           * <p>
14757           * The default implementation behaves as
14758           * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent)
14759           *  View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for
14760           * the case of no accessibility delegate been set.
14761           * </p>
14762           *
14763           * @param host The View hosting the delegate.
14764           * @param event The event to send.
14765           *
14766           * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent)
14767           *      View#sendAccessibilityEventUnchecked(AccessibilityEvent)
14768           */
14769          public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) {
14770              host.sendAccessibilityEventUncheckedInternal(event);
14771          }
14772  
14773          /**
14774           * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then
14775           * to its children for adding their text content to the event.
14776           * <p>
14777           * The default implementation behaves as
14778           * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
14779           *  View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for
14780           * the case of no accessibility delegate been set.
14781           * </p>
14782           *
14783           * @param host The View hosting the delegate.
14784           * @param event The event.
14785           * @return True if the event population was completed.
14786           *
14787           * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
14788           *      View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
14789           */
14790          public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
14791              return host.dispatchPopulateAccessibilityEventInternal(event);
14792          }
14793  
14794          /**
14795           * Gives a chance to the host View to populate the accessibility event with its
14796           * text content.
14797           * <p>
14798           * The default implementation behaves as
14799           * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent)
14800           *  View#onPopulateAccessibilityEvent(AccessibilityEvent)} for
14801           * the case of no accessibility delegate been set.
14802           * </p>
14803           *
14804           * @param host The View hosting the delegate.
14805           * @param event The accessibility event which to populate.
14806           *
14807           * @see View#onPopulateAccessibilityEvent(AccessibilityEvent)
14808           *      View#onPopulateAccessibilityEvent(AccessibilityEvent)
14809           */
14810          public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
14811              host.onPopulateAccessibilityEventInternal(event);
14812          }
14813  
14814          /**
14815           * Initializes an {@link AccessibilityEvent} with information about the
14816           * the host View which is the event source.
14817           * <p>
14818           * The default implementation behaves as
14819           * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent)
14820           *  View#onInitializeAccessibilityEvent(AccessibilityEvent)} for
14821           * the case of no accessibility delegate been set.
14822           * </p>
14823           *
14824           * @param host The View hosting the delegate.
14825           * @param event The event to initialize.
14826           *
14827           * @see View#onInitializeAccessibilityEvent(AccessibilityEvent)
14828           *      View#onInitializeAccessibilityEvent(AccessibilityEvent)
14829           */
14830          public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
14831              host.onInitializeAccessibilityEventInternal(event);
14832          }
14833  
14834          /**
14835           * Initializes an {@link AccessibilityNodeInfo} with information about the host view.
14836           * <p>
14837           * The default implementation behaves as
14838           * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
14839           *  View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for
14840           * the case of no accessibility delegate been set.
14841           * </p>
14842           *
14843           * @param host The View hosting the delegate.
14844           * @param info The instance to initialize.
14845           *
14846           * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
14847           *      View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
14848           */
14849          public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
14850              host.onInitializeAccessibilityNodeInfoInternal(info);
14851          }
14852  
14853          /**
14854           * Called when a child of the host View has requested sending an
14855           * {@link AccessibilityEvent} and gives an opportunity to the parent (the host)
14856           * to augment the event.
14857           * <p>
14858           * The default implementation behaves as
14859           * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
14860           *  ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for
14861           * the case of no accessibility delegate been set.
14862           * </p>
14863           *
14864           * @param host The View hosting the delegate.
14865           * @param child The child which requests sending the event.
14866           * @param event The event to be sent.
14867           * @return True if the event should be sent
14868           *
14869           * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
14870           *      ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
14871           */
14872          public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child,
14873                  AccessibilityEvent event) {
14874              return host.onRequestSendAccessibilityEventInternal(child, event);
14875          }
14876      }
14877  }
14878