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 ScrollingTreeNode_h
27#define ScrollingTreeNode_h
28
29#if ENABLE(THREADED_SCROLLING)
30
31#include "IntRect.h"
32#include "ScrollTypes.h"
33#include "ScrollingCoordinator.h"
34#include <wtf/PassOwnPtr.h>
35
36namespace WebCore {
37
38class ScrollingStateFixedNode;
39class ScrollingStateNode;
40class ScrollingStateScrollingNode;
41
42class ScrollingTreeNode {
43public:
44    explicit ScrollingTreeNode(ScrollingTree*, ScrollingNodeID);
45    virtual ~ScrollingTreeNode();
46
47    virtual void updateBeforeChildren(ScrollingStateNode*) = 0;
48    virtual void updateAfterChildren(ScrollingStateNode*) { }
49
50    virtual void parentScrollPositionDidChange(const IntRect& viewportRect, const FloatSize& cumulativeDelta) = 0;
51
52    ScrollingNodeID scrollingNodeID() const { return m_nodeID; }
53
54    ScrollingTreeNode* parent() const { return m_parent; }
55    void setParent(ScrollingTreeNode* parent) { m_parent = parent; }
56
57    void appendChild(PassOwnPtr<ScrollingTreeNode>);
58    void removeChild(ScrollingTreeNode*);
59
60protected:
61    ScrollingTree* scrollingTree() const { return m_scrollingTree; }
62
63    typedef Vector<OwnPtr<ScrollingTreeNode> > ScrollingTreeChildrenVector;
64    OwnPtr<ScrollingTreeChildrenVector> m_children;
65
66private:
67    ScrollingTree* m_scrollingTree;
68
69    ScrollingNodeID m_nodeID;
70
71    ScrollingTreeNode* m_parent;
72};
73
74} // namespace WebCore
75
76#endif // ENABLE(THREADED_SCROLLING)
77
78#endif // ScrollingTreeNode_h
79