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 ScrollingTreeStickyNode_h 27#define ScrollingTreeStickyNode_h 28 29#if ENABLE(THREADED_SCROLLING) 30 31#include "ScrollingConstraints.h" 32#include "ScrollingTreeNode.h" 33#include <wtf/RetainPtr.h> 34 35OBJC_CLASS CALayer; 36 37namespace WebCore { 38 39class StickyPositionViewportConstraints; 40 41class ScrollingTreeStickyNode : public ScrollingTreeNode { 42public: 43 static PassOwnPtr<ScrollingTreeStickyNode> create(ScrollingTree*, ScrollingNodeID); 44 45 virtual ~ScrollingTreeStickyNode(); 46 47private: 48 ScrollingTreeStickyNode(ScrollingTree*, ScrollingNodeID); 49 50 virtual void updateBeforeChildren(ScrollingStateNode*) OVERRIDE; 51 virtual void parentScrollPositionDidChange(const IntRect& viewportRect, const FloatSize& cumulativeDelta) OVERRIDE; 52 53 StickyPositionViewportConstraints m_constraints; 54 RetainPtr<CALayer> m_layer; 55}; 56 57} // namespace WebCore 58 59#endif // ENABLE(THREADED_SCROLLING) 60 61#endif // ScrollingTreeStickyNode_h 62