1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* Copyright (C) 2008, 2011 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ScrollableArea_h
#define ScrollableArea_h
#include "IntRect.h"
#include "Scrollbar.h"
#include <wtf/Vector.h>
namespace WebCore {
class FloatPoint;
class GraphicsContext;
class PlatformGestureEvent;
class PlatformWheelEvent;
class ScrollAnimator;
#if USE(ACCELERATED_COMPOSITING)
class GraphicsLayer;
#endif
class ScrollableArea {
public:
ScrollableArea();
virtual ~ScrollableArea();
bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1);
void scrollToOffsetWithoutAnimation(const FloatPoint&);
void scrollToOffsetWithoutAnimation(ScrollbarOrientation, float offset);
void scrollToXOffsetWithoutAnimation(float x);
void scrollToYOffsetWithoutAnimation(float x);
void handleWheelEvent(PlatformWheelEvent&);
#if ENABLE(GESTURE_EVENTS)
void handleGestureEvent(const PlatformGestureEvent&);
#endif
// Functions for controlling if you can scroll past the end of the document.
bool constrainsScrollingToContentEdge() const { return m_constrainsScrollingToContentEdge; }
void setConstrainsScrollingToContentEdge(bool constrainsScrollingToContentEdge) { m_constrainsScrollingToContentEdge = constrainsScrollingToContentEdge; }
void setVerticalScrollElasticity(ScrollElasticity scrollElasticity) { m_verticalScrollElasticity = scrollElasticity; }
ScrollElasticity verticalScrollElasticity() const { return m_verticalScrollElasticity; }
void setHorizontalScrollElasticity(ScrollElasticity scrollElasticity) { m_horizontalScrollElasticity = scrollElasticity; }
ScrollElasticity horizontalScrollElasticity() const { return m_horizontalScrollElasticity; }
bool inLiveResize() const { return m_inLiveResize; }
void willStartLiveResize();
void willEndLiveResize();
void didAddVerticalScrollbar(Scrollbar*);
void willRemoveVerticalScrollbar(Scrollbar*);
void didAddHorizontalScrollbar(Scrollbar*);
void willRemoveHorizontalScrollbar(Scrollbar*);
bool hasOverlayScrollbars() const;
virtual ScrollbarOverlayStyle recommendedScrollbarOverlayStyle() const { return ScrollbarOverlayStyleDefault; }
ScrollAnimator* scrollAnimator() const { return m_scrollAnimator.get(); }
const IntPoint& scrollOrigin() const { return m_scrollOrigin; }
virtual bool isActive() const = 0;
virtual int scrollSize(ScrollbarOrientation) const = 0;
virtual int scrollPosition(Scrollbar*) const = 0;
void invalidateScrollbar(Scrollbar*, const IntRect&);
virtual bool isScrollCornerVisible() const = 0;
virtual IntRect scrollCornerRect() const = 0;
void invalidateScrollCorner();
virtual void getTickmarks(Vector<IntRect>&) const { }
// This function should be overriden by subclasses to perform the actual
// scroll of the content.
virtual void setScrollOffset(const IntPoint&) = 0;
// Convert points and rects between the scrollbar and its containing view.
// The client needs to implement these in order to be aware of layout effects
// like CSS transforms.
virtual IntRect convertFromScrollbarToContainingView(const Scrollbar* scrollbar, const IntRect& scrollbarRect) const
{
return scrollbar->Widget::convertToContainingView(scrollbarRect);
}
virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntRect& parentRect) const
{
return scrollbar->Widget::convertFromContainingView(parentRect);
}
virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar* scrollbar, const IntPoint& scrollbarPoint) const
{
return scrollbar->Widget::convertToContainingView(scrollbarPoint);
}
virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntPoint& parentPoint) const
{
return scrollbar->Widget::convertFromContainingView(parentPoint);
}
virtual Scrollbar* horizontalScrollbar() const { return 0; }
virtual Scrollbar* verticalScrollbar() const { return 0; }
virtual IntPoint scrollPosition() const { ASSERT_NOT_REACHED(); return IntPoint(); }
virtual IntPoint minimumScrollPosition() const { ASSERT_NOT_REACHED(); return IntPoint(); }
virtual IntPoint maximumScrollPosition() const { ASSERT_NOT_REACHED(); return IntPoint(); }
virtual IntRect visibleContentRect(bool = false) const { ASSERT_NOT_REACHED(); return IntRect(); }
virtual int visibleHeight() const { ASSERT_NOT_REACHED(); return 0; }
virtual int visibleWidth() const { ASSERT_NOT_REACHED(); return 0; }
virtual IntSize contentsSize() const { ASSERT_NOT_REACHED(); return IntSize(); }
virtual IntSize overhangAmount() const { ASSERT_NOT_REACHED(); return IntSize(); }
virtual IntPoint currentMousePosition() const { return IntPoint(); }
virtual void didCompleteRubberBand(const IntSize&) const { ASSERT_NOT_REACHED(); }
virtual bool shouldSuspendScrollAnimations() const { return true; }
virtual void scrollbarStyleChanged() { }
virtual void setVisibleScrollerThumbRect(const IntRect&) { }
virtual void disconnectFromPage() { }
private:
// NOTE: Only called from the ScrollAnimator.
friend class ScrollAnimator;
void setScrollOffsetFromAnimation(const IntPoint&);
OwnPtr<ScrollAnimator> m_scrollAnimator;
bool m_constrainsScrollingToContentEdge;
bool m_inLiveResize;
ScrollElasticity m_verticalScrollElasticity;
ScrollElasticity m_horizontalScrollElasticity;
protected:
virtual void invalidateScrollbarRect(Scrollbar*, const IntRect&) = 0;
virtual void invalidateScrollCornerRect(const IntRect&) = 0;
#if USE(ACCELERATED_COMPOSITING)
virtual GraphicsLayer* layerForHorizontalScrollbar() const { return 0; }
virtual GraphicsLayer* layerForVerticalScrollbar() const { return 0; }
virtual GraphicsLayer* layerForScrollCorner() const { return 0; }
#endif
bool hasLayerForHorizontalScrollbar() const;
bool hasLayerForVerticalScrollbar() const;
bool hasLayerForScrollCorner() const;
// There are 8 possible combinations of writing mode and direction. Scroll origin will be non-zero in the x or y axis
// if there is any reversed direction or writing-mode. The combinations are:
// writing-mode / direction scrollOrigin.x() set scrollOrigin.y() set
// horizontal-tb / ltr NO NO
// horizontal-tb / rtl YES NO
// horizontal-bt / ltr NO YES
// horizontal-bt / rtl YES YES
// vertical-lr / ltr NO NO
// vertical-lr / rtl NO YES
// vertical-rl / ltr YES NO
// vertical-rl / rtl YES YES
IntPoint m_scrollOrigin;
};
} // namespace WebCore
#endif // ScrollableArea_h
|
