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
|
/*
* Copyright (C) 2012 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. AND ITS CONTRIBUTORS ``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 ITS 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 ScrollingTreeScrollingNode_h
#define ScrollingTreeScrollingNode_h
#if ENABLE(ASYNC_SCROLLING)
#include "IntRect.h"
#include "ScrollTypes.h"
#include "ScrollingCoordinator.h"
#include "ScrollingTreeNode.h"
#include <wtf/PassOwnPtr.h>
namespace WebCore {
class ScrollingTree;
class ScrollingStateScrollingNode;
class ScrollingTreeScrollingNode : public ScrollingTreeNode {
public:
virtual ~ScrollingTreeScrollingNode();
WEBCORE_EXPORT virtual void updateBeforeChildren(const ScrollingStateNode&) override;
WEBCORE_EXPORT virtual void updateAfterChildren(const ScrollingStateNode&) override;
WEBCORE_EXPORT virtual void updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta) override;
virtual void handleWheelEvent(const PlatformWheelEvent&) = 0;
WEBCORE_EXPORT virtual void setScrollPosition(const FloatPoint&);
WEBCORE_EXPORT virtual void setScrollPositionWithoutContentEdgeConstraints(const FloatPoint&);
virtual void updateLayersAfterViewportChange(const FloatRect& fixedPositionRect, double scale) = 0;
virtual void updateLayersAfterDelegatedScroll(const FloatPoint&) { }
virtual FloatPoint scrollPosition() const = 0;
#if ENABLE(CSS_SCROLL_SNAP)
const Vector<float>& horizontalSnapOffsets() const { return m_horizontalSnapOffsets; }
const Vector<float>& verticalSnapOffsets() const { return m_verticalSnapOffsets; }
#endif
protected:
ScrollingTreeScrollingNode(ScrollingTree&, ScrollingNodeType, ScrollingNodeID);
WEBCORE_EXPORT virtual FloatPoint minimumScrollPosition() const;
WEBCORE_EXPORT virtual FloatPoint maximumScrollPosition() const;
virtual void setScrollLayerPosition(const FloatPoint&) = 0;
FloatPoint lastCommittedScrollPosition() const { return m_lastCommittedScrollPosition; }
const FloatSize& scrollableAreaSize() const { return m_scrollableAreaSize; }
const FloatSize& totalContentsSize() const { return m_totalContentsSize; }
const FloatSize& reachableContentsSize() const { return m_reachableContentsSize; }
const IntPoint& scrollOrigin() const { return m_scrollOrigin; }
// If the totalContentsSize changes in the middle of a rubber-band, we still want to use the old totalContentsSize for the sake of
// computing the stretchAmount(). Using the old value will keep the animation smooth. When there is no rubber-band in progress at
// all, m_totalContentsSizeForRubberBand should be equivalent to m_totalContentsSize.
const FloatSize& totalContentsSizeForRubberBand() const { return m_totalContentsSizeForRubberBand; }
void setTotalContentsSizeForRubberBand(const FloatSize& totalContentsSizeForRubberBand) { m_totalContentsSizeForRubberBand = totalContentsSizeForRubberBand; }
ScrollElasticity horizontalScrollElasticity() const { return m_scrollableAreaParameters.horizontalScrollElasticity; }
ScrollElasticity verticalScrollElasticity() const { return m_scrollableAreaParameters.verticalScrollElasticity; }
bool hasEnabledHorizontalScrollbar() const { return m_scrollableAreaParameters.hasEnabledHorizontalScrollbar; }
bool hasEnabledVerticalScrollbar() const { return m_scrollableAreaParameters.hasEnabledVerticalScrollbar; }
bool canHaveScrollbars() const { return m_scrollableAreaParameters.horizontalScrollbarMode != ScrollbarAlwaysOff || m_scrollableAreaParameters.verticalScrollbarMode != ScrollbarAlwaysOff; }
private:
FloatSize m_scrollableAreaSize;
FloatSize m_totalContentsSize;
FloatSize m_totalContentsSizeForRubberBand;
FloatSize m_reachableContentsSize;
FloatPoint m_lastCommittedScrollPosition;
IntPoint m_scrollOrigin;
#if ENABLE(CSS_SCROLL_SNAP)
Vector<float> m_horizontalSnapOffsets;
Vector<float> m_verticalSnapOffsets;
#endif
ScrollableAreaParameters m_scrollableAreaParameters;
};
SCROLLING_NODE_TYPE_CASTS(ScrollingTreeScrollingNode, isScrollingNode());
} // namespace WebCore
#endif // ENABLE(ASYNC_SCROLLING)
#endif // ScrollingTreeScrollingNode_h
|
