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/*
* 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 ScrollingTreeNode_h
#define ScrollingTreeNode_h
#if ENABLE(THREADED_SCROLLING)
#include "IntRect.h"
#include "ScrollTypes.h"
#include "ScrollingCoordinator.h"
#include <wtf/PassOwnPtr.h>
namespace WebCore {
class ScrollingStateFixedNode;
class ScrollingStateNode;
class ScrollingStateScrollingNode;
class ScrollingTreeNode {
public:
explicit ScrollingTreeNode(ScrollingTree*, ScrollingNodeID);
virtual ~ScrollingTreeNode();
virtual void updateBeforeChildren(ScrollingStateNode*) = 0;
virtual void updateAfterChildren(ScrollingStateNode*) { }
virtual void parentScrollPositionDidChange(const IntRect& viewportRect, const FloatSize& cumulativeDelta) = 0;
ScrollingNodeID scrollingNodeID() const { return m_nodeID; }
ScrollingTreeNode* parent() const { return m_parent; }
void setParent(ScrollingTreeNode* parent) { m_parent = parent; }
void appendChild(PassOwnPtr<ScrollingTreeNode>);
void removeChild(ScrollingTreeNode*);
protected:
ScrollingTree* scrollingTree() const { return m_scrollingTree; }
typedef Vector<OwnPtr<ScrollingTreeNode> > ScrollingTreeChildrenVector;
OwnPtr<ScrollingTreeChildrenVector> m_children;
private:
ScrollingTree* m_scrollingTree;
ScrollingNodeID m_nodeID;
ScrollingTreeNode* m_parent;
};
} // namespace WebCore
#endif // ENABLE(THREADED_SCROLLING)
#endif // ScrollingTreeNode_h
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