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
54namespace WebCore {
55
56IntRect 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
66IntSize ScrollView::platformContentsSize() const
67{
68    return m_contentsSize;
69}
70
71int ScrollView::platformActualWidth() const
72{
73    if (parent())
74        return width();
75    return platformWidget()->visibleWidth();
76}
77
78int ScrollView::platformActualHeight() const
79{
80    if (parent())
81        return height();
82    return platformWidget()->visibleHeight();
83}
84
85int ScrollView::platformActualScrollX() const
86{
87    if (parent())
88        return scrollX();
89    return platformWidget()->visibleX();
90}
91
92int ScrollView::platformActualScrollY() const
93{
94    if (parent())
95        return scrollY();
96    return platformWidget()->visibleY();
97}
98
99void ScrollView::platformSetScrollPosition(const WebCore::IntPoint& pt)
100{
101    PlatformBridge::setScrollPosition(this, m_scrollOrigin.x() + pt.x(),
102            m_scrollOrigin.y() + pt.y());
103}
104
105void ScrollView::platformSetScrollbarModes()
106{
107    if (parent()) // no scrollbar for the subframes
108        return;
109    android::WebViewCore::getWebViewCore(this)->setScrollbarModes(m_horizontalScrollbarMode, m_verticalScrollbarMode);
110}
111
112void ScrollView::platformScrollbarModes(ScrollbarMode& h, ScrollbarMode& v) const
113{
114    // m_horizontalScrollbarMode and m_verticalScrollbarMode are set in ScrollView::setScrollbarModes()
115    h = m_horizontalScrollbarMode;
116    v = m_verticalScrollbarMode;
117}
118
119void ScrollView::platformRepaintContentRectangle(const IntRect &rect, bool now)
120{
121    IntRect offsetRect = rect;
122    offsetRect.move(m_scrollOrigin.x(), m_scrollOrigin.y());
123    android::WebViewCore::getWebViewCore(this)->contentInvalidate(offsetRect);
124}
125
126#ifdef ANDROID_CAPTURE_OFFSCREEN_PAINTS
127//  Compute the offscreen parts of the drawn rectangle by subtracting
128//  vis from rect. This can compute up to four rectangular slices.
129void ScrollView::platformOffscreenContentRectangle(const IntRect& vis, const IntRect& rect)
130{
131    android::WebViewCore* core = android::WebViewCore::getWebViewCore(this);
132    if (!core) // SVG does not instantiate webviewcore
133        return; // and doesn't need to record drawing offscreen
134    core->offInvalidate(rect);
135}
136#endif
137
138bool ScrollView::platformIsOffscreen() const
139{
140    /* other platforms override platformIsOffscreen when the browser
141       window is no longer on screen. We override it to prevent gif
142       animations from queuing up subsequent frames during dragging. */
143    return android::WebViewCore::getWebViewCore(this)->drawIsPaused();
144}
145
146} // namespace WebCore
147