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(ASYNC_SCROLLING) 30 31#include "IntRect.h" 32#include "ScrollTypes.h" 33#include "ScrollingCoordinator.h" 34#include <wtf/RefCounted.h> 35 36namespace WebCore { 37 38class ScrollingStateFixedNode; 39class ScrollingStateNode; 40class ScrollingStateScrollingNode; 41 42class ScrollingTreeNode : public RefCounted<ScrollingTreeNode> { 43public: 44 virtual ~ScrollingTreeNode(); 45 46 ScrollingNodeType nodeType() const { return m_nodeType; } 47 ScrollingNodeID scrollingNodeID() const { return m_nodeID; } 48 49 bool isFixedNode() const { return nodeType() == FixedNode; } 50 bool isStickyNode() const { return nodeType() == StickyNode; } 51 bool isScrollingNode() const { return nodeType() == FrameScrollingNode || nodeType() == OverflowScrollingNode; } 52 bool isFrameScrollingNode() const { return nodeType() == FrameScrollingNode; } 53 bool isOverflowScrollingNode() const { return nodeType() == OverflowScrollingNode; } 54 55 virtual void updateBeforeChildren(const ScrollingStateNode&) = 0; 56 virtual void updateAfterChildren(const ScrollingStateNode&) { } 57 58 virtual void updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta) = 0; 59 60 ScrollingTreeNode* parent() const { return m_parent; } 61 void setParent(ScrollingTreeNode* parent) { m_parent = parent; } 62 63 typedef Vector<RefPtr<ScrollingTreeNode>> ScrollingTreeChildrenVector; 64 ScrollingTreeChildrenVector* children() { return m_children.get(); } 65 66 void appendChild(PassRefPtr<ScrollingTreeNode>); 67 void removeChild(ScrollingTreeNode*); 68 69protected: 70 ScrollingTreeNode(ScrollingTree&, ScrollingNodeType, ScrollingNodeID); 71 ScrollingTree& scrollingTree() const { return m_scrollingTree; } 72 73 OwnPtr<ScrollingTreeChildrenVector> m_children; 74 75private: 76 ScrollingTree& m_scrollingTree; 77 78 const ScrollingNodeType m_nodeType; 79 const ScrollingNodeID m_nodeID; 80 81 ScrollingTreeNode* m_parent; 82}; 83 84#define SCROLLING_NODE_TYPE_CASTS(ToValueTypeName, predicate) \ 85 TYPE_CASTS_BASE(ToValueTypeName, ScrollingTreeNode, value, value->predicate, value.predicate) 86 87} // namespace WebCore 88 89#endif // ENABLE(ASYNC_SCROLLING) 90 91#endif // ScrollingTreeNode_h 92