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1  /*
2   * Copyright 2007, The Android Open Source Project
3   *
4   * Redistribution and use in source and binary forms, with or without
5   * modification, are permitted provided that the following conditions
6   * are met:
7   *  * Redistributions of source code must retain the above copyright
8   *    notice, this list of conditions and the following disclaimer.
9   *  * Redistributions in binary form must reproduce the above copyright
10   *    notice, this list of conditions and the following disclaimer in the
11   *    documentation and/or other materials provided with the distribution.
12   *
13   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
14   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24   */
25  #define LOG_TAG "WebCore"
26  
27  #include "config.h"
28  #include "ScrollView.h"
29  
30  #include "FloatRect.h"
31  #include "FrameView.h"
32  #include "IntRect.h"
33  #include "PlatformBridge.h"
34  #include "SkRegion.h"
35  #include "WebCoreFrameBridge.h"
36  #include "WebCoreViewBridge.h"
37  #include "WebViewCore.h"
38  
39  /*
40      This class implementation does NOT actually emulate the Qt ScrollView.
41      It does provide an implementation that khtml will use to interact with
42      WebKit's WebFrameView documentView and our NSScrollView subclass.
43  
44      ScrollView's view is a NSScrollView (or subclass of NSScrollView)
45      in most cases. That scrollview is a subview of an
46      WebCoreFrameView. The WebCoreFrameView's documentView will also be
47      the scroll view's documentView.
48  
49      The WebCoreFrameView's size is the frame size.  The WebCoreFrameView's documentView
50      corresponds to the frame content size.  The scrollview itself is autosized to the
51      WebCoreFrameView's size (see Widget::resize).
52  */
53  
54  namespace WebCore {
55  
platformVisibleContentRect(bool includeScrollbars) const56  IntRect ScrollView::platformVisibleContentRect(bool includeScrollbars) const
57  {
58      // iframe's visible content rect is relative to its parent, not the viewport.
59      // As we auto expand the iframe, the frame rect is the content rect.
60      if (parent())
61          return IntRect(0, 0, width(), height());
62      else
63          return platformWidget()->getVisibleBounds();
64  }
65  
platformContentsSize() const66  IntSize ScrollView::platformContentsSize() const
67  {
68      return m_contentsSize;
69  }
70  
platformActualWidth() const71  int ScrollView::platformActualWidth() const
72  {
73      if (parent())
74          return width();
75      return platformWidget()->visibleWidth();
76  }
77  
platformActualHeight() const78  int ScrollView::platformActualHeight() const
79  {
80      if (parent())
81          return height();
82      return platformWidget()->visibleHeight();
83  }
84  
platformActualScrollX() const85  int ScrollView::platformActualScrollX() const
86  {
87      if (parent())
88          return scrollX();
89      return platformWidget()->visibleX();
90  }
91  
platformActualScrollY() const92  int ScrollView::platformActualScrollY() const
93  {
94      if (parent())
95          return scrollY();
96      return platformWidget()->visibleY();
97  }
98  
platformSetScrollPosition(const WebCore::IntPoint & pt)99  void ScrollView::platformSetScrollPosition(const WebCore::IntPoint& pt)
100  {
101      if (parent()) // don't attempt to scroll subframes; they're fully visible
102          return;
103      PlatformBridge::setScrollPosition(this, pt.x(), pt.y());
104  }
105  
platformSetScrollbarModes()106  void ScrollView::platformSetScrollbarModes()
107  {
108      if (parent()) // no scrollbar for the subframes
109          return;
110      android::WebViewCore::getWebViewCore(this)->setScrollbarModes(m_horizontalScrollbarMode, m_verticalScrollbarMode);
111  }
112  
platformScrollbarModes(ScrollbarMode & h,ScrollbarMode & v) const113  void ScrollView::platformScrollbarModes(ScrollbarMode& h, ScrollbarMode& v) const
114  {
115      // m_horizontalScrollbarMode and m_verticalScrollbarMode are set in ScrollView::setScrollbarModes()
116      h = m_horizontalScrollbarMode;
117      v = m_verticalScrollbarMode;
118  }
119  
platformRepaintContentRectangle(const IntRect & rect,bool now)120  void ScrollView::platformRepaintContentRectangle(const IntRect &rect, bool now)
121  {
122      android::WebViewCore::getWebViewCore(this)->contentInvalidate(rect);
123  }
124  
125  #ifdef ANDROID_CAPTURE_OFFSCREEN_PAINTS
126  //  Compute the offscreen parts of the drawn rectangle by subtracting
127  //  vis from rect. This can compute up to four rectangular slices.
platformOffscreenContentRectangle(const IntRect & vis,const IntRect & rect)128  void ScrollView::platformOffscreenContentRectangle(const IntRect& vis, const IntRect& rect)
129  {
130      android::WebViewCore* core = android::WebViewCore::getWebViewCore(this);
131      if (!core) // SVG does not instantiate webviewcore
132          return; // and doesn't need to record drawing offscreen
133      SkRegion rectRgn = SkRegion(rect);
134      rectRgn.op(vis, SkRegion::kDifference_Op);
135      SkRegion::Iterator iter(rectRgn);
136      for (; !iter.done(); iter.next()) {
137          const SkIRect& diff = iter.rect();
138          core->offInvalidate(diff);
139      }
140  }
141  #endif
142  
platformIsOffscreen() const143  bool ScrollView::platformIsOffscreen() const
144  {
145      /* other platforms override platformIsOffscreen when the browser
146         window is no longer on screen. We override it to prevent gif
147         animations from queuing up subsequent frames during dragging. */
148      return android::WebViewCore::getWebViewCore(this)->drawIsPaused();
149  }
150  
151  } // namespace WebCore
152