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 ScrollingStateFixedNode_h 27#define ScrollingStateFixedNode_h 28 29#if ENABLE(THREADED_SCROLLING) || USE(COORDINATED_GRAPHICS) 30 31#include "ScrollingConstraints.h" 32#include "ScrollingStateNode.h" 33 34#include <wtf/Forward.h> 35 36namespace WebCore { 37 38class FixedPositionViewportConstraints; 39 40class ScrollingStateFixedNode : public ScrollingStateNode { 41public: 42 static PassOwnPtr<ScrollingStateFixedNode> create(ScrollingStateTree*, ScrollingNodeID); 43 44 virtual PassOwnPtr<ScrollingStateNode> clone(); 45 46 virtual ~ScrollingStateFixedNode(); 47 48 enum { 49 ViewportConstraints = NumStateNodeBits 50 }; 51 52 void updateConstraints(const FixedPositionViewportConstraints&); 53 const FixedPositionViewportConstraints& viewportConstraints() const { return m_constraints; } 54 55private: 56 ScrollingStateFixedNode(ScrollingStateTree*, ScrollingNodeID); 57 ScrollingStateFixedNode(const ScrollingStateFixedNode&); 58 59 virtual bool isFixedNode() OVERRIDE { return true; } 60 61 virtual void syncLayerPositionForViewportRect(const LayoutRect& viewportRect) OVERRIDE; 62 63 virtual void dumpProperties(TextStream&, int indent) const OVERRIDE; 64 65 FixedPositionViewportConstraints m_constraints; 66}; 67 68inline ScrollingStateFixedNode* toScrollingStateFixedNode(ScrollingStateNode* node) 69{ 70 ASSERT_WITH_SECURITY_IMPLICATION(!node || node->isFixedNode()); 71 return static_cast<ScrollingStateFixedNode*>(node); 72} 73 74// This will catch anyone doing an unnecessary cast. 75void toScrollingStateFixedNode(const ScrollingStateFixedNode*); 76 77} // namespace WebCore 78 79#endif // ENABLE(THREADED_SCROLLING) || USE(COORDINATED_GRAPHICS) 80 81#endif // ScrollingStateFixedNode_h 82