1/*
2 * Copyright (C) 2012 Apple Inc. All rights reserved.
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 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. 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 APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef ScrollingStateStickyNode_h
27#define ScrollingStateStickyNode_h
28
29#if ENABLE(ASYNC_SCROLLING) || USE(COORDINATED_GRAPHICS)
30
31#include "ScrollingConstraints.h"
32#include "ScrollingStateNode.h"
33
34#include <wtf/Forward.h>
35
36namespace WebCore {
37
38class StickyPositionViewportConstraints;
39
40class ScrollingStateStickyNode final : public ScrollingStateNode {
41public:
42    static PassRefPtr<ScrollingStateStickyNode> create(ScrollingStateTree&, ScrollingNodeID);
43
44    virtual PassRefPtr<ScrollingStateNode> clone(ScrollingStateTree&);
45
46    virtual ~ScrollingStateStickyNode();
47
48    enum {
49        ViewportConstraints = NumStateNodeBits
50    };
51
52    void updateConstraints(const StickyPositionViewportConstraints&);
53    const StickyPositionViewportConstraints& viewportConstraints() const { return m_constraints; }
54
55private:
56    ScrollingStateStickyNode(ScrollingStateTree&, ScrollingNodeID);
57    ScrollingStateStickyNode(const ScrollingStateStickyNode&, ScrollingStateTree&);
58
59    virtual void syncLayerPositionForViewportRect(const LayoutRect& viewportRect) override;
60
61    virtual void dumpProperties(TextStream&, int indent) const override;
62
63    StickyPositionViewportConstraints m_constraints;
64};
65
66SCROLLING_STATE_NODE_TYPE_CASTS(ScrollingStateStickyNode, isStickyNode());
67
68} // namespace WebCore
69
70#endif // ENABLE(ASYNC_SCROLLING) || USE(COORDINATED_GRAPHICS)
71
72#endif // ScrollingStateStickyNode_h
73