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 ScrollingTreeScrollingNodeMac_h 27#define ScrollingTreeScrollingNodeMac_h 28 29#if ENABLE(THREADED_SCROLLING) 30 31#include "ScrollElasticityController.h" 32#include "ScrollingTreeScrollingNode.h" 33#include <wtf/RetainPtr.h> 34 35OBJC_CLASS CALayer; 36 37namespace WebCore { 38 39class ScrollingTreeScrollingNodeMac : public ScrollingTreeScrollingNode, private ScrollElasticityControllerClient { 40public: 41 explicit ScrollingTreeScrollingNodeMac(ScrollingTree*, ScrollingNodeID); 42 virtual ~ScrollingTreeScrollingNodeMac(); 43 44private: 45 // ScrollingTreeNode member functions. 46 virtual void updateBeforeChildren(ScrollingStateNode*) OVERRIDE; 47 virtual void updateAfterChildren(ScrollingStateNode*) OVERRIDE; 48 virtual void handleWheelEvent(const PlatformWheelEvent&) OVERRIDE; 49 50 // ScrollElasticityController member functions. 51 virtual bool allowsHorizontalStretching() OVERRIDE; 52 virtual bool allowsVerticalStretching() OVERRIDE; 53 virtual IntSize stretchAmount() OVERRIDE; 54 virtual bool pinnedInDirection(const FloatSize&) OVERRIDE; 55 virtual bool canScrollHorizontally() OVERRIDE; 56 virtual bool canScrollVertically() OVERRIDE; 57 virtual bool shouldRubberBandInDirection(ScrollDirection) OVERRIDE; 58 virtual IntPoint absoluteScrollPosition() OVERRIDE; 59 virtual void immediateScrollBy(const FloatSize&) OVERRIDE; 60 virtual void immediateScrollByWithoutContentEdgeConstraints(const FloatSize&) OVERRIDE; 61 virtual void startSnapRubberbandTimer() OVERRIDE; 62 virtual void stopSnapRubberbandTimer() OVERRIDE; 63 virtual void adjustScrollPositionToBoundsIfNecessary() OVERRIDE; 64 65 IntPoint scrollPosition() const; 66 void setScrollPosition(const IntPoint&); 67 void setScrollPositionWithoutContentEdgeConstraints(const IntPoint&); 68 69 void setScrollLayerPosition(const IntPoint&); 70 71 IntPoint minimumScrollPosition() const; 72 IntPoint maximumScrollPosition() const; 73 74 void scrollBy(const IntSize&); 75 void scrollByWithoutContentEdgeConstraints(const IntSize&); 76 77 void updateMainFramePinState(const IntPoint& scrollPosition); 78 79 void logExposedUnfilledArea(); 80 81 ScrollElasticityController m_scrollElasticityController; 82 RetainPtr<CFRunLoopTimerRef> m_snapRubberbandTimer; 83 84 RetainPtr<CALayer> m_scrollLayer; 85 RetainPtr<CALayer> m_counterScrollingLayer; 86 RetainPtr<CALayer> m_headerLayer; 87 RetainPtr<CALayer> m_footerLayer; 88 IntPoint m_probableMainThreadScrollPosition; 89 bool m_lastScrollHadUnfilledPixels; 90}; 91 92} // namespace WebCore 93 94#endif // ENABLE(THREADED_SCROLLING) 95 96#endif // ScrollingTreeScrollingNodeMac_h 97