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1 /*
2  * Copyright (C) 2014 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.widget;
18 
19 import com.android.internal.R;
20 
21 import android.app.Service;
22 import android.content.Context;
23 import android.content.res.Configuration;
24 import android.content.res.TypedArray;
25 import android.database.DataSetObserver;
26 import android.graphics.Canvas;
27 import android.graphics.Paint;
28 import android.graphics.Rect;
29 import android.graphics.drawable.Drawable;
30 import android.icu.util.Calendar;
31 import android.text.format.DateUtils;
32 import android.util.AttributeSet;
33 import android.util.DisplayMetrics;
34 import android.util.TypedValue;
35 import android.view.GestureDetector;
36 import android.view.LayoutInflater;
37 import android.view.MotionEvent;
38 import android.view.View;
39 import android.view.ViewGroup;
40 
41 import java.util.Locale;
42 
43 import libcore.icu.LocaleData;
44 
45 /**
46  * A delegate implementing the legacy CalendarView
47  */
48 class CalendarViewLegacyDelegate extends CalendarView.AbstractCalendarViewDelegate {
49     /**
50      * Default value whether to show week number.
51      */
52     private static final boolean DEFAULT_SHOW_WEEK_NUMBER = true;
53 
54     /**
55      * The number of milliseconds in a day.e
56      */
57     private static final long MILLIS_IN_DAY = 86400000L;
58 
59     /**
60      * The number of day in a week.
61      */
62     private static final int DAYS_PER_WEEK = 7;
63 
64     /**
65      * The number of milliseconds in a week.
66      */
67     private static final long MILLIS_IN_WEEK = DAYS_PER_WEEK * MILLIS_IN_DAY;
68 
69     /**
70      * Affects when the month selection will change while scrolling upe
71      */
72     private static final int SCROLL_HYST_WEEKS = 2;
73 
74     /**
75      * How long the GoTo fling animation should last.
76      */
77     private static final int GOTO_SCROLL_DURATION = 1000;
78 
79     /**
80      * The duration of the adjustment upon a user scroll in milliseconds.
81      */
82     private static final int ADJUSTMENT_SCROLL_DURATION = 500;
83 
84     /**
85      * How long to wait after receiving an onScrollStateChanged notification
86      * before acting on it.
87      */
88     private static final int SCROLL_CHANGE_DELAY = 40;
89 
90     private static final int DEFAULT_SHOWN_WEEK_COUNT = 6;
91 
92     private static final int DEFAULT_DATE_TEXT_SIZE = 14;
93 
94     private static final int UNSCALED_SELECTED_DATE_VERTICAL_BAR_WIDTH = 6;
95 
96     private static final int UNSCALED_WEEK_MIN_VISIBLE_HEIGHT = 12;
97 
98     private static final int UNSCALED_LIST_SCROLL_TOP_OFFSET = 2;
99 
100     private static final int UNSCALED_BOTTOM_BUFFER = 20;
101 
102     private static final int UNSCALED_WEEK_SEPARATOR_LINE_WIDTH = 1;
103 
104     private static final int DEFAULT_WEEK_DAY_TEXT_APPEARANCE_RES_ID = -1;
105 
106     private final int mWeekSeperatorLineWidth;
107 
108     private int mDateTextSize;
109 
110     private Drawable mSelectedDateVerticalBar;
111 
112     private final int mSelectedDateVerticalBarWidth;
113 
114     private int mSelectedWeekBackgroundColor;
115 
116     private int mFocusedMonthDateColor;
117 
118     private int mUnfocusedMonthDateColor;
119 
120     private int mWeekSeparatorLineColor;
121 
122     private int mWeekNumberColor;
123 
124     private int mWeekDayTextAppearanceResId;
125 
126     private int mDateTextAppearanceResId;
127 
128     /**
129      * The top offset of the weeks list.
130      */
131     private int mListScrollTopOffset = 2;
132 
133     /**
134      * The visible height of a week view.
135      */
136     private int mWeekMinVisibleHeight = 12;
137 
138     /**
139      * The visible height of a week view.
140      */
141     private int mBottomBuffer = 20;
142 
143     /**
144      * The number of shown weeks.
145      */
146     private int mShownWeekCount;
147 
148     /**
149      * Flag whether to show the week number.
150      */
151     private boolean mShowWeekNumber;
152 
153     /**
154      * The number of day per week to be shown.
155      */
156     private int mDaysPerWeek = 7;
157 
158     /**
159      * The friction of the week list while flinging.
160      */
161     private float mFriction = .05f;
162 
163     /**
164      * Scale for adjusting velocity of the week list while flinging.
165      */
166     private float mVelocityScale = 0.333f;
167 
168     /**
169      * The adapter for the weeks list.
170      */
171     private WeeksAdapter mAdapter;
172 
173     /**
174      * The weeks list.
175      */
176     private ListView mListView;
177 
178     /**
179      * The name of the month to display.
180      */
181     private TextView mMonthName;
182 
183     /**
184      * The header with week day names.
185      */
186     private ViewGroup mDayNamesHeader;
187 
188     /**
189      * Cached abbreviations for day of week names.
190      */
191     private String[] mDayNamesShort;
192 
193     /**
194      * Cached full-length day of week names.
195      */
196     private String[] mDayNamesLong;
197 
198     /**
199      * The first day of the week.
200      */
201     private int mFirstDayOfWeek;
202 
203     /**
204      * Which month should be displayed/highlighted [0-11].
205      */
206     private int mCurrentMonthDisplayed = -1;
207 
208     /**
209      * Used for tracking during a scroll.
210      */
211     private long mPreviousScrollPosition;
212 
213     /**
214      * Used for tracking which direction the view is scrolling.
215      */
216     private boolean mIsScrollingUp = false;
217 
218     /**
219      * The previous scroll state of the weeks ListView.
220      */
221     private int mPreviousScrollState = AbsListView.OnScrollListener.SCROLL_STATE_IDLE;
222 
223     /**
224      * The current scroll state of the weeks ListView.
225      */
226     private int mCurrentScrollState = AbsListView.OnScrollListener.SCROLL_STATE_IDLE;
227 
228     /**
229      * Listener for changes in the selected day.
230      */
231     private CalendarView.OnDateChangeListener mOnDateChangeListener;
232 
233     /**
234      * Command for adjusting the position after a scroll/fling.
235      */
236     private ScrollStateRunnable mScrollStateChangedRunnable = new ScrollStateRunnable();
237 
238     /**
239      * Temporary instance to avoid multiple instantiations.
240      */
241     private Calendar mTempDate;
242 
243     /**
244      * The first day of the focused month.
245      */
246     private Calendar mFirstDayOfMonth;
247 
248     /**
249      * The start date of the range supported by this picker.
250      */
251     private Calendar mMinDate;
252 
253     /**
254      * The end date of the range supported by this picker.
255      */
256     private Calendar mMaxDate;
257 
CalendarViewLegacyDelegate(CalendarView delegator, Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)258     CalendarViewLegacyDelegate(CalendarView delegator, Context context, AttributeSet attrs,
259             int defStyleAttr, int defStyleRes) {
260         super(delegator, context);
261 
262         final TypedArray a = context.obtainStyledAttributes(attrs,
263                 R.styleable.CalendarView, defStyleAttr, defStyleRes);
264         mShowWeekNumber = a.getBoolean(R.styleable.CalendarView_showWeekNumber,
265                 DEFAULT_SHOW_WEEK_NUMBER);
266         mFirstDayOfWeek = a.getInt(R.styleable.CalendarView_firstDayOfWeek,
267                 LocaleData.get(Locale.getDefault()).firstDayOfWeek);
268         final String minDate = a.getString(R.styleable.CalendarView_minDate);
269         if (!CalendarView.parseDate(minDate, mMinDate)) {
270             CalendarView.parseDate(DEFAULT_MIN_DATE, mMinDate);
271         }
272         final String maxDate = a.getString(R.styleable.CalendarView_maxDate);
273         if (!CalendarView.parseDate(maxDate, mMaxDate)) {
274             CalendarView.parseDate(DEFAULT_MAX_DATE, mMaxDate);
275         }
276         if (mMaxDate.before(mMinDate)) {
277             throw new IllegalArgumentException("Max date cannot be before min date.");
278         }
279         mShownWeekCount = a.getInt(R.styleable.CalendarView_shownWeekCount,
280                 DEFAULT_SHOWN_WEEK_COUNT);
281         mSelectedWeekBackgroundColor = a.getColor(
282                 R.styleable.CalendarView_selectedWeekBackgroundColor, 0);
283         mFocusedMonthDateColor = a.getColor(
284                 R.styleable.CalendarView_focusedMonthDateColor, 0);
285         mUnfocusedMonthDateColor = a.getColor(
286                 R.styleable.CalendarView_unfocusedMonthDateColor, 0);
287         mWeekSeparatorLineColor = a.getColor(
288                 R.styleable.CalendarView_weekSeparatorLineColor, 0);
289         mWeekNumberColor = a.getColor(R.styleable.CalendarView_weekNumberColor, 0);
290         mSelectedDateVerticalBar = a.getDrawable(
291                 R.styleable.CalendarView_selectedDateVerticalBar);
292 
293         mDateTextAppearanceResId = a.getResourceId(
294                 R.styleable.CalendarView_dateTextAppearance, R.style.TextAppearance_Small);
295         updateDateTextSize();
296 
297         mWeekDayTextAppearanceResId = a.getResourceId(
298                 R.styleable.CalendarView_weekDayTextAppearance,
299                 DEFAULT_WEEK_DAY_TEXT_APPEARANCE_RES_ID);
300         a.recycle();
301 
302         DisplayMetrics displayMetrics = mDelegator.getResources().getDisplayMetrics();
303         mWeekMinVisibleHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
304                 UNSCALED_WEEK_MIN_VISIBLE_HEIGHT, displayMetrics);
305         mListScrollTopOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
306                 UNSCALED_LIST_SCROLL_TOP_OFFSET, displayMetrics);
307         mBottomBuffer = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
308                 UNSCALED_BOTTOM_BUFFER, displayMetrics);
309         mSelectedDateVerticalBarWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
310                 UNSCALED_SELECTED_DATE_VERTICAL_BAR_WIDTH, displayMetrics);
311         mWeekSeperatorLineWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
312                 UNSCALED_WEEK_SEPARATOR_LINE_WIDTH, displayMetrics);
313 
314         LayoutInflater layoutInflater = (LayoutInflater) mContext
315                 .getSystemService(Service.LAYOUT_INFLATER_SERVICE);
316         View content = layoutInflater.inflate(R.layout.calendar_view, null, false);
317         mDelegator.addView(content);
318 
319         mListView = (ListView) mDelegator.findViewById(R.id.list);
320         mDayNamesHeader = (ViewGroup) content.findViewById(R.id.day_names);
321         mMonthName = (TextView) content.findViewById(R.id.month_name);
322 
323         setUpHeader();
324         setUpListView();
325         setUpAdapter();
326 
327         // go to today or whichever is close to today min or max date
328         mTempDate.setTimeInMillis(System.currentTimeMillis());
329         if (mTempDate.before(mMinDate)) {
330             goTo(mMinDate, false, true, true);
331         } else if (mMaxDate.before(mTempDate)) {
332             goTo(mMaxDate, false, true, true);
333         } else {
334             goTo(mTempDate, false, true, true);
335         }
336 
337         mDelegator.invalidate();
338     }
339 
340     @Override
setShownWeekCount(int count)341     public void setShownWeekCount(int count) {
342         if (mShownWeekCount != count) {
343             mShownWeekCount = count;
344             mDelegator.invalidate();
345         }
346     }
347 
348     @Override
getShownWeekCount()349     public int getShownWeekCount() {
350         return mShownWeekCount;
351     }
352 
353     @Override
setSelectedWeekBackgroundColor(int color)354     public void setSelectedWeekBackgroundColor(int color) {
355         if (mSelectedWeekBackgroundColor != color) {
356             mSelectedWeekBackgroundColor = color;
357             final int childCount = mListView.getChildCount();
358             for (int i = 0; i < childCount; i++) {
359                 WeekView weekView = (WeekView) mListView.getChildAt(i);
360                 if (weekView.mHasSelectedDay) {
361                     weekView.invalidate();
362                 }
363             }
364         }
365     }
366 
367     @Override
getSelectedWeekBackgroundColor()368     public int getSelectedWeekBackgroundColor() {
369         return mSelectedWeekBackgroundColor;
370     }
371 
372     @Override
setFocusedMonthDateColor(int color)373     public void setFocusedMonthDateColor(int color) {
374         if (mFocusedMonthDateColor != color) {
375             mFocusedMonthDateColor = color;
376             final int childCount = mListView.getChildCount();
377             for (int i = 0; i < childCount; i++) {
378                 WeekView weekView = (WeekView) mListView.getChildAt(i);
379                 if (weekView.mHasFocusedDay) {
380                     weekView.invalidate();
381                 }
382             }
383         }
384     }
385 
386     @Override
getFocusedMonthDateColor()387     public int getFocusedMonthDateColor() {
388         return mFocusedMonthDateColor;
389     }
390 
391     @Override
setUnfocusedMonthDateColor(int color)392     public void setUnfocusedMonthDateColor(int color) {
393         if (mUnfocusedMonthDateColor != color) {
394             mUnfocusedMonthDateColor = color;
395             final int childCount = mListView.getChildCount();
396             for (int i = 0; i < childCount; i++) {
397                 WeekView weekView = (WeekView) mListView.getChildAt(i);
398                 if (weekView.mHasUnfocusedDay) {
399                     weekView.invalidate();
400                 }
401             }
402         }
403     }
404 
405     @Override
getUnfocusedMonthDateColor()406     public int getUnfocusedMonthDateColor() {
407         return mUnfocusedMonthDateColor;
408     }
409 
410     @Override
setWeekNumberColor(int color)411     public void setWeekNumberColor(int color) {
412         if (mWeekNumberColor != color) {
413             mWeekNumberColor = color;
414             if (mShowWeekNumber) {
415                 invalidateAllWeekViews();
416             }
417         }
418     }
419 
420     @Override
getWeekNumberColor()421     public int getWeekNumberColor() {
422         return mWeekNumberColor;
423     }
424 
425     @Override
setWeekSeparatorLineColor(int color)426     public void setWeekSeparatorLineColor(int color) {
427         if (mWeekSeparatorLineColor != color) {
428             mWeekSeparatorLineColor = color;
429             invalidateAllWeekViews();
430         }
431     }
432 
433     @Override
getWeekSeparatorLineColor()434     public int getWeekSeparatorLineColor() {
435         return mWeekSeparatorLineColor;
436     }
437 
438     @Override
setSelectedDateVerticalBar(int resourceId)439     public void setSelectedDateVerticalBar(int resourceId) {
440         Drawable drawable = mDelegator.getContext().getDrawable(resourceId);
441         setSelectedDateVerticalBar(drawable);
442     }
443 
444     @Override
setSelectedDateVerticalBar(Drawable drawable)445     public void setSelectedDateVerticalBar(Drawable drawable) {
446         if (mSelectedDateVerticalBar != drawable) {
447             mSelectedDateVerticalBar = drawable;
448             final int childCount = mListView.getChildCount();
449             for (int i = 0; i < childCount; i++) {
450                 WeekView weekView = (WeekView) mListView.getChildAt(i);
451                 if (weekView.mHasSelectedDay) {
452                     weekView.invalidate();
453                 }
454             }
455         }
456     }
457 
458     @Override
getSelectedDateVerticalBar()459     public Drawable getSelectedDateVerticalBar() {
460         return mSelectedDateVerticalBar;
461     }
462 
463     @Override
setWeekDayTextAppearance(int resourceId)464     public void setWeekDayTextAppearance(int resourceId) {
465         if (mWeekDayTextAppearanceResId != resourceId) {
466             mWeekDayTextAppearanceResId = resourceId;
467             setUpHeader();
468         }
469     }
470 
471     @Override
getWeekDayTextAppearance()472     public int getWeekDayTextAppearance() {
473         return mWeekDayTextAppearanceResId;
474     }
475 
476     @Override
setDateTextAppearance(int resourceId)477     public void setDateTextAppearance(int resourceId) {
478         if (mDateTextAppearanceResId != resourceId) {
479             mDateTextAppearanceResId = resourceId;
480             updateDateTextSize();
481             invalidateAllWeekViews();
482         }
483     }
484 
485     @Override
getDateTextAppearance()486     public int getDateTextAppearance() {
487         return mDateTextAppearanceResId;
488     }
489 
490     @Override
setMinDate(long minDate)491     public void setMinDate(long minDate) {
492         mTempDate.setTimeInMillis(minDate);
493         if (isSameDate(mTempDate, mMinDate)) {
494             return;
495         }
496         mMinDate.setTimeInMillis(minDate);
497         // make sure the current date is not earlier than
498         // the new min date since the latter is used for
499         // calculating the indices in the adapter thus
500         // avoiding out of bounds error
501         Calendar date = mAdapter.mSelectedDate;
502         if (date.before(mMinDate)) {
503             mAdapter.setSelectedDay(mMinDate);
504         }
505         // reinitialize the adapter since its range depends on min date
506         mAdapter.init();
507         if (date.before(mMinDate)) {
508             setDate(mTempDate.getTimeInMillis());
509         } else {
510             // we go to the current date to force the ListView to query its
511             // adapter for the shown views since we have changed the adapter
512             // range and the base from which the later calculates item indices
513             // note that calling setDate will not work since the date is the same
514             goTo(date, false, true, false);
515         }
516     }
517 
518     @Override
getMinDate()519     public long getMinDate() {
520         return mMinDate.getTimeInMillis();
521     }
522 
523     @Override
setMaxDate(long maxDate)524     public void setMaxDate(long maxDate) {
525         mTempDate.setTimeInMillis(maxDate);
526         if (isSameDate(mTempDate, mMaxDate)) {
527             return;
528         }
529         mMaxDate.setTimeInMillis(maxDate);
530         // reinitialize the adapter since its range depends on max date
531         mAdapter.init();
532         Calendar date = mAdapter.mSelectedDate;
533         if (date.after(mMaxDate)) {
534             setDate(mMaxDate.getTimeInMillis());
535         } else {
536             // we go to the current date to force the ListView to query its
537             // adapter for the shown views since we have changed the adapter
538             // range and the base from which the later calculates item indices
539             // note that calling setDate will not work since the date is the same
540             goTo(date, false, true, false);
541         }
542     }
543 
544     @Override
getMaxDate()545     public long getMaxDate() {
546         return mMaxDate.getTimeInMillis();
547     }
548 
549     @Override
setShowWeekNumber(boolean showWeekNumber)550     public void setShowWeekNumber(boolean showWeekNumber) {
551         if (mShowWeekNumber == showWeekNumber) {
552             return;
553         }
554         mShowWeekNumber = showWeekNumber;
555         mAdapter.notifyDataSetChanged();
556         setUpHeader();
557     }
558 
559     @Override
getShowWeekNumber()560     public boolean getShowWeekNumber() {
561         return mShowWeekNumber;
562     }
563 
564     @Override
setFirstDayOfWeek(int firstDayOfWeek)565     public void setFirstDayOfWeek(int firstDayOfWeek) {
566         if (mFirstDayOfWeek == firstDayOfWeek) {
567             return;
568         }
569         mFirstDayOfWeek = firstDayOfWeek;
570         mAdapter.init();
571         mAdapter.notifyDataSetChanged();
572         setUpHeader();
573     }
574 
575     @Override
getFirstDayOfWeek()576     public int getFirstDayOfWeek() {
577         return mFirstDayOfWeek;
578     }
579 
580     @Override
setDate(long date)581     public void setDate(long date) {
582         setDate(date, false, false);
583     }
584 
585     @Override
setDate(long date, boolean animate, boolean center)586     public void setDate(long date, boolean animate, boolean center) {
587         mTempDate.setTimeInMillis(date);
588         if (isSameDate(mTempDate, mAdapter.mSelectedDate)) {
589             return;
590         }
591         goTo(mTempDate, animate, true, center);
592     }
593 
594     @Override
getDate()595     public long getDate() {
596         return mAdapter.mSelectedDate.getTimeInMillis();
597     }
598 
599     @Override
setOnDateChangeListener(CalendarView.OnDateChangeListener listener)600     public void setOnDateChangeListener(CalendarView.OnDateChangeListener listener) {
601         mOnDateChangeListener = listener;
602     }
603 
604     @Override
onConfigurationChanged(Configuration newConfig)605     public void onConfigurationChanged(Configuration newConfig) {
606         setCurrentLocale(newConfig.locale);
607     }
608 
609     /**
610      * Sets the current locale.
611      *
612      * @param locale The current locale.
613      */
614     @Override
setCurrentLocale(Locale locale)615     protected void setCurrentLocale(Locale locale) {
616         super.setCurrentLocale(locale);
617 
618         mTempDate = getCalendarForLocale(mTempDate, locale);
619         mFirstDayOfMonth = getCalendarForLocale(mFirstDayOfMonth, locale);
620         mMinDate = getCalendarForLocale(mMinDate, locale);
621         mMaxDate = getCalendarForLocale(mMaxDate, locale);
622     }
updateDateTextSize()623     private void updateDateTextSize() {
624         TypedArray dateTextAppearance = mDelegator.getContext().obtainStyledAttributes(
625                 mDateTextAppearanceResId, R.styleable.TextAppearance);
626         mDateTextSize = dateTextAppearance.getDimensionPixelSize(
627                 R.styleable.TextAppearance_textSize, DEFAULT_DATE_TEXT_SIZE);
628         dateTextAppearance.recycle();
629     }
630 
631     /**
632      * Invalidates all week views.
633      */
invalidateAllWeekViews()634     private void invalidateAllWeekViews() {
635         final int childCount = mListView.getChildCount();
636         for (int i = 0; i < childCount; i++) {
637             View view = mListView.getChildAt(i);
638             view.invalidate();
639         }
640     }
641 
642     /**
643      * Gets a calendar for locale bootstrapped with the value of a given calendar.
644      *
645      * @param oldCalendar The old calendar.
646      * @param locale The locale.
647      */
getCalendarForLocale(Calendar oldCalendar, Locale locale)648     private static Calendar getCalendarForLocale(Calendar oldCalendar, Locale locale) {
649         if (oldCalendar == null) {
650             return Calendar.getInstance(locale);
651         } else {
652             final long currentTimeMillis = oldCalendar.getTimeInMillis();
653             Calendar newCalendar = Calendar.getInstance(locale);
654             newCalendar.setTimeInMillis(currentTimeMillis);
655             return newCalendar;
656         }
657     }
658 
659     /**
660      * @return True if the <code>firstDate</code> is the same as the <code>
661      * secondDate</code>.
662      */
isSameDate(Calendar firstDate, Calendar secondDate)663     private static boolean isSameDate(Calendar firstDate, Calendar secondDate) {
664         return (firstDate.get(Calendar.DAY_OF_YEAR) == secondDate.get(Calendar.DAY_OF_YEAR)
665                 && firstDate.get(Calendar.YEAR) == secondDate.get(Calendar.YEAR));
666     }
667 
668     /**
669      * Creates a new adapter if necessary and sets up its parameters.
670      */
setUpAdapter()671     private void setUpAdapter() {
672         if (mAdapter == null) {
673             mAdapter = new WeeksAdapter(mContext);
674             mAdapter.registerDataSetObserver(new DataSetObserver() {
675                 @Override
676                 public void onChanged() {
677                     if (mOnDateChangeListener != null) {
678                         Calendar selectedDay = mAdapter.getSelectedDay();
679                         mOnDateChangeListener.onSelectedDayChange(mDelegator,
680                                 selectedDay.get(Calendar.YEAR),
681                                 selectedDay.get(Calendar.MONTH),
682                                 selectedDay.get(Calendar.DAY_OF_MONTH));
683                     }
684                 }
685             });
686             mListView.setAdapter(mAdapter);
687         }
688 
689         // refresh the view with the new parameters
690         mAdapter.notifyDataSetChanged();
691     }
692 
693     /**
694      * Sets up the strings to be used by the header.
695      */
setUpHeader()696     private void setUpHeader() {
697         mDayNamesShort = new String[mDaysPerWeek];
698         mDayNamesLong = new String[mDaysPerWeek];
699         for (int i = mFirstDayOfWeek, count = mFirstDayOfWeek + mDaysPerWeek; i < count; i++) {
700             int calendarDay = (i > Calendar.SATURDAY) ? i - Calendar.SATURDAY : i;
701             mDayNamesShort[i - mFirstDayOfWeek] = DateUtils.getDayOfWeekString(calendarDay,
702                     DateUtils.LENGTH_SHORTEST);
703             mDayNamesLong[i - mFirstDayOfWeek] = DateUtils.getDayOfWeekString(calendarDay,
704                     DateUtils.LENGTH_LONG);
705         }
706 
707         TextView label = (TextView) mDayNamesHeader.getChildAt(0);
708         if (mShowWeekNumber) {
709             label.setVisibility(View.VISIBLE);
710         } else {
711             label.setVisibility(View.GONE);
712         }
713         for (int i = 1, count = mDayNamesHeader.getChildCount(); i < count; i++) {
714             label = (TextView) mDayNamesHeader.getChildAt(i);
715             if (mWeekDayTextAppearanceResId > -1) {
716                 label.setTextAppearance(mWeekDayTextAppearanceResId);
717             }
718             if (i < mDaysPerWeek + 1) {
719                 label.setText(mDayNamesShort[i - 1]);
720                 label.setContentDescription(mDayNamesLong[i - 1]);
721                 label.setVisibility(View.VISIBLE);
722             } else {
723                 label.setVisibility(View.GONE);
724             }
725         }
726         mDayNamesHeader.invalidate();
727     }
728 
729     /**
730      * Sets all the required fields for the list view.
731      */
setUpListView()732     private void setUpListView() {
733         // Configure the listview
734         mListView.setDivider(null);
735         mListView.setItemsCanFocus(true);
736         mListView.setVerticalScrollBarEnabled(false);
737         mListView.setOnScrollListener(new AbsListView.OnScrollListener() {
738             public void onScrollStateChanged(AbsListView view, int scrollState) {
739                 CalendarViewLegacyDelegate.this.onScrollStateChanged(view, scrollState);
740             }
741 
742             public void onScroll(
743                     AbsListView view, int firstVisibleItem, int visibleItemCount,
744                     int totalItemCount) {
745                 CalendarViewLegacyDelegate.this.onScroll(view, firstVisibleItem,
746                         visibleItemCount, totalItemCount);
747             }
748         });
749         // Make the scrolling behavior nicer
750         mListView.setFriction(mFriction);
751         mListView.setVelocityScale(mVelocityScale);
752     }
753 
754     /**
755      * This moves to the specified time in the view. If the time is not already
756      * in range it will move the list so that the first of the month containing
757      * the time is at the top of the view. If the new time is already in view
758      * the list will not be scrolled unless forceScroll is true. This time may
759      * optionally be highlighted as selected as well.
760      *
761      * @param date The time to move to.
762      * @param animate Whether to scroll to the given time or just redraw at the
763      *            new location.
764      * @param setSelected Whether to set the given time as selected.
765      * @param forceScroll Whether to recenter even if the time is already
766      *            visible.
767      *
768      * @throws IllegalArgumentException of the provided date is before the
769      *        range start of after the range end.
770      */
goTo(Calendar date, boolean animate, boolean setSelected, boolean forceScroll)771     private void goTo(Calendar date, boolean animate, boolean setSelected,
772             boolean forceScroll) {
773         if (date.before(mMinDate) || date.after(mMaxDate)) {
774             throw new IllegalArgumentException("Time not between " + mMinDate.getTime()
775                     + " and " + mMaxDate.getTime());
776         }
777         // Find the first and last entirely visible weeks
778         int firstFullyVisiblePosition = mListView.getFirstVisiblePosition();
779         View firstChild = mListView.getChildAt(0);
780         if (firstChild != null && firstChild.getTop() < 0) {
781             firstFullyVisiblePosition++;
782         }
783         int lastFullyVisiblePosition = firstFullyVisiblePosition + mShownWeekCount - 1;
784         if (firstChild != null && firstChild.getTop() > mBottomBuffer) {
785             lastFullyVisiblePosition--;
786         }
787         if (setSelected) {
788             mAdapter.setSelectedDay(date);
789         }
790         // Get the week we're going to
791         int position = getWeeksSinceMinDate(date);
792 
793         // Check if the selected day is now outside of our visible range
794         // and if so scroll to the month that contains it
795         if (position < firstFullyVisiblePosition || position > lastFullyVisiblePosition
796                 || forceScroll) {
797             mFirstDayOfMonth.setTimeInMillis(date.getTimeInMillis());
798             mFirstDayOfMonth.set(Calendar.DAY_OF_MONTH, 1);
799 
800             setMonthDisplayed(mFirstDayOfMonth);
801 
802             // the earliest time we can scroll to is the min date
803             if (mFirstDayOfMonth.before(mMinDate)) {
804                 position = 0;
805             } else {
806                 position = getWeeksSinceMinDate(mFirstDayOfMonth);
807             }
808 
809             mPreviousScrollState = AbsListView.OnScrollListener.SCROLL_STATE_FLING;
810             if (animate) {
811                 mListView.smoothScrollToPositionFromTop(position, mListScrollTopOffset,
812                         GOTO_SCROLL_DURATION);
813             } else {
814                 mListView.setSelectionFromTop(position, mListScrollTopOffset);
815                 // Perform any after scroll operations that are needed
816                 onScrollStateChanged(mListView, AbsListView.OnScrollListener.SCROLL_STATE_IDLE);
817             }
818         } else if (setSelected) {
819             // Otherwise just set the selection
820             setMonthDisplayed(date);
821         }
822     }
823 
824     /**
825      * Called when a <code>view</code> transitions to a new <code>scrollState
826      * </code>.
827      */
onScrollStateChanged(AbsListView view, int scrollState)828     private void onScrollStateChanged(AbsListView view, int scrollState) {
829         mScrollStateChangedRunnable.doScrollStateChange(view, scrollState);
830     }
831 
832     /**
833      * Updates the title and selected month if the <code>view</code> has moved to a new
834      * month.
835      */
onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)836     private void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
837                           int totalItemCount) {
838         WeekView child = (WeekView) view.getChildAt(0);
839         if (child == null) {
840             return;
841         }
842 
843         // Figure out where we are
844         long currScroll =
845                 view.getFirstVisiblePosition() * child.getHeight() - child.getBottom();
846 
847         // If we have moved since our last call update the direction
848         if (currScroll < mPreviousScrollPosition) {
849             mIsScrollingUp = true;
850         } else if (currScroll > mPreviousScrollPosition) {
851             mIsScrollingUp = false;
852         } else {
853             return;
854         }
855 
856         // Use some hysteresis for checking which month to highlight. This
857         // causes the month to transition when two full weeks of a month are
858         // visible when scrolling up, and when the first day in a month reaches
859         // the top of the screen when scrolling down.
860         int offset = child.getBottom() < mWeekMinVisibleHeight ? 1 : 0;
861         if (mIsScrollingUp) {
862             child = (WeekView) view.getChildAt(SCROLL_HYST_WEEKS + offset);
863         } else if (offset != 0) {
864             child = (WeekView) view.getChildAt(offset);
865         }
866 
867         if (child != null) {
868             // Find out which month we're moving into
869             int month;
870             if (mIsScrollingUp) {
871                 month = child.getMonthOfFirstWeekDay();
872             } else {
873                 month = child.getMonthOfLastWeekDay();
874             }
875 
876             // And how it relates to our current highlighted month
877             int monthDiff;
878             if (mCurrentMonthDisplayed == 11 && month == 0) {
879                 monthDiff = 1;
880             } else if (mCurrentMonthDisplayed == 0 && month == 11) {
881                 monthDiff = -1;
882             } else {
883                 monthDiff = month - mCurrentMonthDisplayed;
884             }
885 
886             // Only switch months if we're scrolling away from the currently
887             // selected month
888             if ((!mIsScrollingUp && monthDiff > 0) || (mIsScrollingUp && monthDiff < 0)) {
889                 Calendar firstDay = child.getFirstDay();
890                 if (mIsScrollingUp) {
891                     firstDay.add(Calendar.DAY_OF_MONTH, -DAYS_PER_WEEK);
892                 } else {
893                     firstDay.add(Calendar.DAY_OF_MONTH, DAYS_PER_WEEK);
894                 }
895                 setMonthDisplayed(firstDay);
896             }
897         }
898         mPreviousScrollPosition = currScroll;
899         mPreviousScrollState = mCurrentScrollState;
900     }
901 
902     /**
903      * Sets the month displayed at the top of this view based on time. Override
904      * to add custom events when the title is changed.
905      *
906      * @param calendar A day in the new focus month.
907      */
setMonthDisplayed(Calendar calendar)908     private void setMonthDisplayed(Calendar calendar) {
909         mCurrentMonthDisplayed = calendar.get(Calendar.MONTH);
910         mAdapter.setFocusMonth(mCurrentMonthDisplayed);
911         final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_NO_MONTH_DAY
912                 | DateUtils.FORMAT_SHOW_YEAR;
913         final long millis = calendar.getTimeInMillis();
914         String newMonthName = DateUtils.formatDateRange(mContext, millis, millis, flags);
915         mMonthName.setText(newMonthName);
916         mMonthName.invalidate();
917     }
918 
919     /**
920      * @return Returns the number of weeks between the current <code>date</code>
921      *         and the <code>mMinDate</code>.
922      */
getWeeksSinceMinDate(Calendar date)923     private int getWeeksSinceMinDate(Calendar date) {
924         if (date.before(mMinDate)) {
925             throw new IllegalArgumentException("fromDate: " + mMinDate.getTime()
926                     + " does not precede toDate: " + date.getTime());
927         }
928         long endTimeMillis = date.getTimeInMillis()
929                 + date.getTimeZone().getOffset(date.getTimeInMillis());
930         long startTimeMillis = mMinDate.getTimeInMillis()
931                 + mMinDate.getTimeZone().getOffset(mMinDate.getTimeInMillis());
932         long dayOffsetMillis = (mMinDate.get(Calendar.DAY_OF_WEEK) - mFirstDayOfWeek)
933                 * MILLIS_IN_DAY;
934         return (int) ((endTimeMillis - startTimeMillis + dayOffsetMillis) / MILLIS_IN_WEEK);
935     }
936 
937     /**
938      * Command responsible for acting upon scroll state changes.
939      */
940     private class ScrollStateRunnable implements Runnable {
941         private AbsListView mView;
942 
943         private int mNewState;
944 
945         /**
946          * Sets up the runnable with a short delay in case the scroll state
947          * immediately changes again.
948          *
949          * @param view The list view that changed state
950          * @param scrollState The new state it changed to
951          */
doScrollStateChange(AbsListView view, int scrollState)952         public void doScrollStateChange(AbsListView view, int scrollState) {
953             mView = view;
954             mNewState = scrollState;
955             mDelegator.removeCallbacks(this);
956             mDelegator.postDelayed(this, SCROLL_CHANGE_DELAY);
957         }
958 
run()959         public void run() {
960             mCurrentScrollState = mNewState;
961             // Fix the position after a scroll or a fling ends
962             if (mNewState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE
963                     && mPreviousScrollState != AbsListView.OnScrollListener.SCROLL_STATE_IDLE) {
964                 View child = mView.getChildAt(0);
965                 if (child == null) {
966                     // The view is no longer visible, just return
967                     return;
968                 }
969                 int dist = child.getBottom() - mListScrollTopOffset;
970                 if (dist > mListScrollTopOffset) {
971                     if (mIsScrollingUp) {
972                         mView.smoothScrollBy(dist - child.getHeight(),
973                                 ADJUSTMENT_SCROLL_DURATION);
974                     } else {
975                         mView.smoothScrollBy(dist, ADJUSTMENT_SCROLL_DURATION);
976                     }
977                 }
978             }
979             mPreviousScrollState = mNewState;
980         }
981     }
982 
983     /**
984      * <p>
985      * This is a specialized adapter for creating a list of weeks with
986      * selectable days. It can be configured to display the week number, start
987      * the week on a given day, show a reduced number of days, or display an
988      * arbitrary number of weeks at a time.
989      * </p>
990      */
991     private class WeeksAdapter extends BaseAdapter implements View.OnTouchListener {
992 
993         private int mSelectedWeek;
994 
995         private GestureDetector mGestureDetector;
996 
997         private int mFocusedMonth;
998 
999         private final Calendar mSelectedDate = Calendar.getInstance();
1000 
1001         private int mTotalWeekCount;
1002 
WeeksAdapter(Context context)1003         public WeeksAdapter(Context context) {
1004             mContext = context;
1005             mGestureDetector = new GestureDetector(mContext, new WeeksAdapter.CalendarGestureListener());
1006             init();
1007         }
1008 
1009         /**
1010          * Set up the gesture detector and selected time
1011          */
init()1012         private void init() {
1013             mSelectedWeek = getWeeksSinceMinDate(mSelectedDate);
1014             mTotalWeekCount = getWeeksSinceMinDate(mMaxDate);
1015             if (mMinDate.get(Calendar.DAY_OF_WEEK) != mFirstDayOfWeek
1016                     || mMaxDate.get(Calendar.DAY_OF_WEEK) != mFirstDayOfWeek) {
1017                 mTotalWeekCount++;
1018             }
1019             notifyDataSetChanged();
1020         }
1021 
1022         /**
1023          * Updates the selected day and related parameters.
1024          *
1025          * @param selectedDay The time to highlight
1026          */
setSelectedDay(Calendar selectedDay)1027         public void setSelectedDay(Calendar selectedDay) {
1028             if (selectedDay.get(Calendar.DAY_OF_YEAR) == mSelectedDate.get(Calendar.DAY_OF_YEAR)
1029                     && selectedDay.get(Calendar.YEAR) == mSelectedDate.get(Calendar.YEAR)) {
1030                 return;
1031             }
1032             mSelectedDate.setTimeInMillis(selectedDay.getTimeInMillis());
1033             mSelectedWeek = getWeeksSinceMinDate(mSelectedDate);
1034             mFocusedMonth = mSelectedDate.get(Calendar.MONTH);
1035             notifyDataSetChanged();
1036         }
1037 
1038         /**
1039          * @return The selected day of month.
1040          */
getSelectedDay()1041         public Calendar getSelectedDay() {
1042             return mSelectedDate;
1043         }
1044 
1045         @Override
getCount()1046         public int getCount() {
1047             return mTotalWeekCount;
1048         }
1049 
1050         @Override
getItem(int position)1051         public Object getItem(int position) {
1052             return null;
1053         }
1054 
1055         @Override
getItemId(int position)1056         public long getItemId(int position) {
1057             return position;
1058         }
1059 
1060         @Override
getView(int position, View convertView, ViewGroup parent)1061         public View getView(int position, View convertView, ViewGroup parent) {
1062             WeekView weekView = null;
1063             if (convertView != null) {
1064                 weekView = (WeekView) convertView;
1065             } else {
1066                 weekView = new WeekView(mContext);
1067                 AbsListView.LayoutParams params =
1068                         new AbsListView.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT,
1069                                 FrameLayout.LayoutParams.WRAP_CONTENT);
1070                 weekView.setLayoutParams(params);
1071                 weekView.setClickable(true);
1072                 weekView.setOnTouchListener(this);
1073             }
1074 
1075             int selectedWeekDay = (mSelectedWeek == position) ? mSelectedDate.get(
1076                     Calendar.DAY_OF_WEEK) : -1;
1077             weekView.init(position, selectedWeekDay, mFocusedMonth);
1078 
1079             return weekView;
1080         }
1081 
1082         /**
1083          * Changes which month is in focus and updates the view.
1084          *
1085          * @param month The month to show as in focus [0-11]
1086          */
setFocusMonth(int month)1087         public void setFocusMonth(int month) {
1088             if (mFocusedMonth == month) {
1089                 return;
1090             }
1091             mFocusedMonth = month;
1092             notifyDataSetChanged();
1093         }
1094 
1095         @Override
onTouch(View v, MotionEvent event)1096         public boolean onTouch(View v, MotionEvent event) {
1097             if (mListView.isEnabled() && mGestureDetector.onTouchEvent(event)) {
1098                 WeekView weekView = (WeekView) v;
1099                 // if we cannot find a day for the given location we are done
1100                 if (!weekView.getDayFromLocation(event.getX(), mTempDate)) {
1101                     return true;
1102                 }
1103                 // it is possible that the touched day is outside the valid range
1104                 // we draw whole weeks but range end can fall not on the week end
1105                 if (mTempDate.before(mMinDate) || mTempDate.after(mMaxDate)) {
1106                     return true;
1107                 }
1108                 onDateTapped(mTempDate);
1109                 return true;
1110             }
1111             return false;
1112         }
1113 
1114         /**
1115          * Maintains the same hour/min/sec but moves the day to the tapped day.
1116          *
1117          * @param day The day that was tapped
1118          */
onDateTapped(Calendar day)1119         private void onDateTapped(Calendar day) {
1120             setSelectedDay(day);
1121             setMonthDisplayed(day);
1122         }
1123 
1124         /**
1125          * This is here so we can identify single tap events and set the
1126          * selected day correctly
1127          */
1128         class CalendarGestureListener extends GestureDetector.SimpleOnGestureListener {
1129             @Override
onSingleTapUp(MotionEvent e)1130             public boolean onSingleTapUp(MotionEvent e) {
1131                 return true;
1132             }
1133         }
1134     }
1135 
1136     /**
1137      * <p>
1138      * This is a dynamic view for drawing a single week. It can be configured to
1139      * display the week number, start the week on a given day, or show a reduced
1140      * number of days. It is intended for use as a single view within a
1141      * ListView. See {@link WeeksAdapter} for usage.
1142      * </p>
1143      */
1144     private class WeekView extends View {
1145 
1146         private final Rect mTempRect = new Rect();
1147 
1148         private final Paint mDrawPaint = new Paint();
1149 
1150         private final Paint mMonthNumDrawPaint = new Paint();
1151 
1152         // Cache the number strings so we don't have to recompute them each time
1153         private String[] mDayNumbers;
1154 
1155         // Quick lookup for checking which days are in the focus month
1156         private boolean[] mFocusDay;
1157 
1158         // Whether this view has a focused day.
1159         private boolean mHasFocusedDay;
1160 
1161         // Whether this view has only focused days.
1162         private boolean mHasUnfocusedDay;
1163 
1164         // The first day displayed by this item
1165         private Calendar mFirstDay;
1166 
1167         // The month of the first day in this week
1168         private int mMonthOfFirstWeekDay = -1;
1169 
1170         // The month of the last day in this week
1171         private int mLastWeekDayMonth = -1;
1172 
1173         // The position of this week, equivalent to weeks since the week of Jan
1174         // 1st, 1900
1175         private int mWeek = -1;
1176 
1177         // Quick reference to the width of this view, matches parent
1178         private int mWidth;
1179 
1180         // The height this view should draw at in pixels, set by height param
1181         private int mHeight;
1182 
1183         // If this view contains the selected day
1184         private boolean mHasSelectedDay = false;
1185 
1186         // Which day is selected [0-6] or -1 if no day is selected
1187         private int mSelectedDay = -1;
1188 
1189         // The number of days + a spot for week number if it is displayed
1190         private int mNumCells;
1191 
1192         // The left edge of the selected day
1193         private int mSelectedLeft = -1;
1194 
1195         // The right edge of the selected day
1196         private int mSelectedRight = -1;
1197 
WeekView(Context context)1198         public WeekView(Context context) {
1199             super(context);
1200 
1201             // Sets up any standard paints that will be used
1202             initilaizePaints();
1203         }
1204 
1205         /**
1206          * Initializes this week view.
1207          *
1208          * @param weekNumber The number of the week this view represents. The
1209          *            week number is a zero based index of the weeks since
1210          *            {@link android.widget.CalendarView#getMinDate()}.
1211          * @param selectedWeekDay The selected day of the week from 0 to 6, -1 if no
1212          *            selected day.
1213          * @param focusedMonth The month that is currently in focus i.e.
1214          *            highlighted.
1215          */
init(int weekNumber, int selectedWeekDay, int focusedMonth)1216         public void init(int weekNumber, int selectedWeekDay, int focusedMonth) {
1217             mSelectedDay = selectedWeekDay;
1218             mHasSelectedDay = mSelectedDay != -1;
1219             mNumCells = mShowWeekNumber ? mDaysPerWeek + 1 : mDaysPerWeek;
1220             mWeek = weekNumber;
1221             mTempDate.setTimeInMillis(mMinDate.getTimeInMillis());
1222 
1223             mTempDate.add(Calendar.WEEK_OF_YEAR, mWeek);
1224             mTempDate.setFirstDayOfWeek(mFirstDayOfWeek);
1225 
1226             // Allocate space for caching the day numbers and focus values
1227             mDayNumbers = new String[mNumCells];
1228             mFocusDay = new boolean[mNumCells];
1229 
1230             // If we're showing the week number calculate it based on Monday
1231             int i = 0;
1232             if (mShowWeekNumber) {
1233                 mDayNumbers[0] = String.format(Locale.getDefault(), "%d",
1234                         mTempDate.get(Calendar.WEEK_OF_YEAR));
1235                 i++;
1236             }
1237 
1238             // Now adjust our starting day based on the start day of the week
1239             int diff = mFirstDayOfWeek - mTempDate.get(Calendar.DAY_OF_WEEK);
1240             mTempDate.add(Calendar.DAY_OF_MONTH, diff);
1241 
1242             mFirstDay = (Calendar) mTempDate.clone();
1243             mMonthOfFirstWeekDay = mTempDate.get(Calendar.MONTH);
1244 
1245             mHasUnfocusedDay = true;
1246             for (; i < mNumCells; i++) {
1247                 final boolean isFocusedDay = (mTempDate.get(Calendar.MONTH) == focusedMonth);
1248                 mFocusDay[i] = isFocusedDay;
1249                 mHasFocusedDay |= isFocusedDay;
1250                 mHasUnfocusedDay &= !isFocusedDay;
1251                 // do not draw dates outside the valid range to avoid user confusion
1252                 if (mTempDate.before(mMinDate) || mTempDate.after(mMaxDate)) {
1253                     mDayNumbers[i] = "";
1254                 } else {
1255                     mDayNumbers[i] = String.format(Locale.getDefault(), "%d",
1256                             mTempDate.get(Calendar.DAY_OF_MONTH));
1257                 }
1258                 mTempDate.add(Calendar.DAY_OF_MONTH, 1);
1259             }
1260             // We do one extra add at the end of the loop, if that pushed us to
1261             // new month undo it
1262             if (mTempDate.get(Calendar.DAY_OF_MONTH) == 1) {
1263                 mTempDate.add(Calendar.DAY_OF_MONTH, -1);
1264             }
1265             mLastWeekDayMonth = mTempDate.get(Calendar.MONTH);
1266 
1267             updateSelectionPositions();
1268         }
1269 
1270         /**
1271          * Initialize the paint instances.
1272          */
initilaizePaints()1273         private void initilaizePaints() {
1274             mDrawPaint.setFakeBoldText(false);
1275             mDrawPaint.setAntiAlias(true);
1276             mDrawPaint.setStyle(Paint.Style.FILL);
1277 
1278             mMonthNumDrawPaint.setFakeBoldText(true);
1279             mMonthNumDrawPaint.setAntiAlias(true);
1280             mMonthNumDrawPaint.setStyle(Paint.Style.FILL);
1281             mMonthNumDrawPaint.setTextAlign(Paint.Align.CENTER);
1282             mMonthNumDrawPaint.setTextSize(mDateTextSize);
1283         }
1284 
1285         /**
1286          * Returns the month of the first day in this week.
1287          *
1288          * @return The month the first day of this view is in.
1289          */
getMonthOfFirstWeekDay()1290         public int getMonthOfFirstWeekDay() {
1291             return mMonthOfFirstWeekDay;
1292         }
1293 
1294         /**
1295          * Returns the month of the last day in this week
1296          *
1297          * @return The month the last day of this view is in
1298          */
getMonthOfLastWeekDay()1299         public int getMonthOfLastWeekDay() {
1300             return mLastWeekDayMonth;
1301         }
1302 
1303         /**
1304          * Returns the first day in this view.
1305          *
1306          * @return The first day in the view.
1307          */
getFirstDay()1308         public Calendar getFirstDay() {
1309             return mFirstDay;
1310         }
1311 
1312         /**
1313          * Calculates the day that the given x position is in, accounting for
1314          * week number.
1315          *
1316          * @param x The x position of the touch event.
1317          * @return True if a day was found for the given location.
1318          */
getDayFromLocation(float x, Calendar outCalendar)1319         public boolean getDayFromLocation(float x, Calendar outCalendar) {
1320             final boolean isLayoutRtl = isLayoutRtl();
1321 
1322             int start;
1323             int end;
1324 
1325             if (isLayoutRtl) {
1326                 start = 0;
1327                 end = mShowWeekNumber ? mWidth - mWidth / mNumCells : mWidth;
1328             } else {
1329                 start = mShowWeekNumber ? mWidth / mNumCells : 0;
1330                 end = mWidth;
1331             }
1332 
1333             if (x < start || x > end) {
1334                 outCalendar.clear();
1335                 return false;
1336             }
1337 
1338             // Selection is (x - start) / (pixels/day) which is (x - start) * day / pixels
1339             int dayPosition = (int) ((x - start) * mDaysPerWeek / (end - start));
1340 
1341             if (isLayoutRtl) {
1342                 dayPosition = mDaysPerWeek - 1 - dayPosition;
1343             }
1344 
1345             outCalendar.setTimeInMillis(mFirstDay.getTimeInMillis());
1346             outCalendar.add(Calendar.DAY_OF_MONTH, dayPosition);
1347 
1348             return true;
1349         }
1350 
1351         @Override
onDraw(Canvas canvas)1352         protected void onDraw(Canvas canvas) {
1353             drawBackground(canvas);
1354             drawWeekNumbersAndDates(canvas);
1355             drawWeekSeparators(canvas);
1356             drawSelectedDateVerticalBars(canvas);
1357         }
1358 
1359         /**
1360          * This draws the selection highlight if a day is selected in this week.
1361          *
1362          * @param canvas The canvas to draw on
1363          */
drawBackground(Canvas canvas)1364         private void drawBackground(Canvas canvas) {
1365             if (!mHasSelectedDay) {
1366                 return;
1367             }
1368             mDrawPaint.setColor(mSelectedWeekBackgroundColor);
1369 
1370             mTempRect.top = mWeekSeperatorLineWidth;
1371             mTempRect.bottom = mHeight;
1372 
1373             final boolean isLayoutRtl = isLayoutRtl();
1374 
1375             if (isLayoutRtl) {
1376                 mTempRect.left = 0;
1377                 mTempRect.right = mSelectedLeft - 2;
1378             } else {
1379                 mTempRect.left = mShowWeekNumber ? mWidth / mNumCells : 0;
1380                 mTempRect.right = mSelectedLeft - 2;
1381             }
1382             canvas.drawRect(mTempRect, mDrawPaint);
1383 
1384             if (isLayoutRtl) {
1385                 mTempRect.left = mSelectedRight + 3;
1386                 mTempRect.right = mShowWeekNumber ? mWidth - mWidth / mNumCells : mWidth;
1387             } else {
1388                 mTempRect.left = mSelectedRight + 3;
1389                 mTempRect.right = mWidth;
1390             }
1391             canvas.drawRect(mTempRect, mDrawPaint);
1392         }
1393 
1394         /**
1395          * Draws the week and month day numbers for this week.
1396          *
1397          * @param canvas The canvas to draw on
1398          */
drawWeekNumbersAndDates(Canvas canvas)1399         private void drawWeekNumbersAndDates(Canvas canvas) {
1400             final float textHeight = mDrawPaint.getTextSize();
1401             final int y = (int) ((mHeight + textHeight) / 2) - mWeekSeperatorLineWidth;
1402             final int nDays = mNumCells;
1403             final int divisor = 2 * nDays;
1404 
1405             mDrawPaint.setTextAlign(Paint.Align.CENTER);
1406             mDrawPaint.setTextSize(mDateTextSize);
1407 
1408             int i = 0;
1409 
1410             if (isLayoutRtl()) {
1411                 for (; i < nDays - 1; i++) {
1412                     mMonthNumDrawPaint.setColor(mFocusDay[i] ? mFocusedMonthDateColor
1413                             : mUnfocusedMonthDateColor);
1414                     int x = (2 * i + 1) * mWidth / divisor;
1415                     canvas.drawText(mDayNumbers[nDays - 1 - i], x, y, mMonthNumDrawPaint);
1416                 }
1417                 if (mShowWeekNumber) {
1418                     mDrawPaint.setColor(mWeekNumberColor);
1419                     int x = mWidth - mWidth / divisor;
1420                     canvas.drawText(mDayNumbers[0], x, y, mDrawPaint);
1421                 }
1422             } else {
1423                 if (mShowWeekNumber) {
1424                     mDrawPaint.setColor(mWeekNumberColor);
1425                     int x = mWidth / divisor;
1426                     canvas.drawText(mDayNumbers[0], x, y, mDrawPaint);
1427                     i++;
1428                 }
1429                 for (; i < nDays; i++) {
1430                     mMonthNumDrawPaint.setColor(mFocusDay[i] ? mFocusedMonthDateColor
1431                             : mUnfocusedMonthDateColor);
1432                     int x = (2 * i + 1) * mWidth / divisor;
1433                     canvas.drawText(mDayNumbers[i], x, y, mMonthNumDrawPaint);
1434                 }
1435             }
1436         }
1437 
1438         /**
1439          * Draws a horizontal line for separating the weeks.
1440          *
1441          * @param canvas The canvas to draw on.
1442          */
drawWeekSeparators(Canvas canvas)1443         private void drawWeekSeparators(Canvas canvas) {
1444             // If it is the topmost fully visible child do not draw separator line
1445             int firstFullyVisiblePosition = mListView.getFirstVisiblePosition();
1446             if (mListView.getChildAt(0).getTop() < 0) {
1447                 firstFullyVisiblePosition++;
1448             }
1449             if (firstFullyVisiblePosition == mWeek) {
1450                 return;
1451             }
1452             mDrawPaint.setColor(mWeekSeparatorLineColor);
1453             mDrawPaint.setStrokeWidth(mWeekSeperatorLineWidth);
1454             float startX;
1455             float stopX;
1456             if (isLayoutRtl()) {
1457                 startX = 0;
1458                 stopX = mShowWeekNumber ? mWidth - mWidth / mNumCells : mWidth;
1459             } else {
1460                 startX = mShowWeekNumber ? mWidth / mNumCells : 0;
1461                 stopX = mWidth;
1462             }
1463             canvas.drawLine(startX, 0, stopX, 0, mDrawPaint);
1464         }
1465 
1466         /**
1467          * Draws the selected date bars if this week has a selected day.
1468          *
1469          * @param canvas The canvas to draw on
1470          */
drawSelectedDateVerticalBars(Canvas canvas)1471         private void drawSelectedDateVerticalBars(Canvas canvas) {
1472             if (!mHasSelectedDay) {
1473                 return;
1474             }
1475             mSelectedDateVerticalBar.setBounds(
1476                     mSelectedLeft - mSelectedDateVerticalBarWidth / 2,
1477                     mWeekSeperatorLineWidth,
1478                     mSelectedLeft + mSelectedDateVerticalBarWidth / 2,
1479                     mHeight);
1480             mSelectedDateVerticalBar.draw(canvas);
1481             mSelectedDateVerticalBar.setBounds(
1482                     mSelectedRight - mSelectedDateVerticalBarWidth / 2,
1483                     mWeekSeperatorLineWidth,
1484                     mSelectedRight + mSelectedDateVerticalBarWidth / 2,
1485                     mHeight);
1486             mSelectedDateVerticalBar.draw(canvas);
1487         }
1488 
1489         @Override
onSizeChanged(int w, int h, int oldw, int oldh)1490         protected void onSizeChanged(int w, int h, int oldw, int oldh) {
1491             mWidth = w;
1492             updateSelectionPositions();
1493         }
1494 
1495         /**
1496          * This calculates the positions for the selected day lines.
1497          */
updateSelectionPositions()1498         private void updateSelectionPositions() {
1499             if (mHasSelectedDay) {
1500                 final boolean isLayoutRtl = isLayoutRtl();
1501                 int selectedPosition = mSelectedDay - mFirstDayOfWeek;
1502                 if (selectedPosition < 0) {
1503                     selectedPosition += 7;
1504                 }
1505                 if (mShowWeekNumber && !isLayoutRtl) {
1506                     selectedPosition++;
1507                 }
1508                 if (isLayoutRtl) {
1509                     mSelectedLeft = (mDaysPerWeek - 1 - selectedPosition) * mWidth / mNumCells;
1510 
1511                 } else {
1512                     mSelectedLeft = selectedPosition * mWidth / mNumCells;
1513                 }
1514                 mSelectedRight = mSelectedLeft + mWidth / mNumCells;
1515             }
1516         }
1517 
1518         @Override
onMeasure(int widthMeasureSpec, int heightMeasureSpec)1519         protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
1520             mHeight = (mListView.getHeight() - mListView.getPaddingTop() - mListView
1521                     .getPaddingBottom()) / mShownWeekCount;
1522             setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec), mHeight);
1523         }
1524     }
1525 
1526 }
1527