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