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/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ScrollingCoordinatorMac_h
#define ScrollingCoordinatorMac_h
#if ENABLE(THREADED_SCROLLING)
#include "ScrollingCoordinator.h"
namespace WebCore {
class ScrollingStateNode;
class ScrollingStateScrollingNode;
class ScrollingStateTree;
class ScrollingCoordinatorMac : public ScrollingCoordinator {
public:
explicit ScrollingCoordinatorMac(Page*);
virtual ~ScrollingCoordinatorMac();
virtual void pageDestroyed();
virtual ScrollingTree* scrollingTree() const;
virtual void commitTreeStateIfNeeded();
// Should be called whenever the given frame view has been laid out.
virtual void frameViewLayoutUpdated(FrameView*);
// Should be called whenever the root layer for the given frame view changes.
virtual void frameViewRootLayerDidChange(FrameView*);
// Should be called whenever the scrollbar layer for the given scrollable area changes.
virtual void scrollableAreaScrollbarLayerDidChange(ScrollableArea*, ScrollbarOrientation);
// Requests that the scrolling coordinator updates the scroll position of the given frame view. If this function returns true, it means that the
// position will be updated asynchronously. If it returns false, the caller should update the scrolling position itself.
virtual bool requestScrollPositionUpdate(FrameView*, const IntPoint&);
// Handle the wheel event on the scrolling thread. Returns whether the event was handled or not.
virtual bool handleWheelEvent(FrameView*, const PlatformWheelEvent&);
// These functions are used to indicate that a layer should be (or should not longer be) represented by a node
// in the scrolling tree.
virtual ScrollingNodeID attachToStateTree(ScrollingNodeType, ScrollingNodeID newNodeID, ScrollingNodeID parentID);
virtual void detachFromStateTree(ScrollingNodeID);
// This function wipes out the current tree.
virtual void clearStateTree();
virtual String scrollingStateTreeAsText() const OVERRIDE;
virtual bool isRubberBandInProgress() const OVERRIDE;
virtual bool rubberBandsAtBottom() const OVERRIDE;
virtual void setRubberBandsAtBottom(bool) OVERRIDE;
virtual bool rubberBandsAtTop() const OVERRIDE;
virtual void setRubberBandsAtTop(bool) OVERRIDE;
virtual void setScrollPinningBehavior(ScrollPinningBehavior) OVERRIDE;
private:
// Return whether this scrolling coordinator can keep fixed position layers fixed to their
// containers while scrolling.
virtual bool supportsFixedPositionLayers() const OVERRIDE { return true; }
// This function will update the ScrollingStateNode for the given viewport constrained object.
virtual void updateViewportConstrainedNode(ScrollingNodeID, const ViewportConstraints&, GraphicsLayer*) OVERRIDE;
virtual void updateScrollingNode(ScrollingNodeID, GraphicsLayer* scrollLayer, GraphicsLayer* counterScrollingLayer) OVERRIDE;
// Called to synch the GraphicsLayer positions for child layers when their CALayers have been moved by the scrolling thread.
virtual void syncChildPositions(const LayoutRect& viewportRect) OVERRIDE;
virtual void recomputeWheelEventHandlerCountForFrameView(FrameView*);
virtual void setShouldUpdateScrollLayerPositionOnMainThread(MainThreadScrollingReasons);
virtual bool hasVisibleSlowRepaintViewportConstrainedObjects(FrameView*) const { return false; }
void ensureRootStateNodeForFrameView(FrameView*);
struct ScrollParameters {
ScrollElasticity horizontalScrollElasticity;
ScrollElasticity verticalScrollElasticity;
bool hasEnabledHorizontalScrollbar;
bool hasEnabledVerticalScrollbar;
ScrollbarMode horizontalScrollbarMode;
ScrollbarMode verticalScrollbarMode;
IntPoint scrollOrigin;
IntRect viewportRect;
IntSize totalContentsSize;
float frameScaleFactor;
int headerHeight;
int footerHeight;
};
void setScrollParametersForNode(const ScrollParameters&, ScrollingStateScrollingNode*);
void setScrollLayerForNode(GraphicsLayer*, ScrollingStateNode*);
void setCounterScrollingLayerForNode(GraphicsLayer*, ScrollingStateScrollingNode*);
void setHeaderLayerForNode(GraphicsLayer*, ScrollingStateScrollingNode*);
void setFooterLayerForNode(GraphicsLayer*, ScrollingStateScrollingNode*);
void setNonFastScrollableRegionForNode(const Region&, ScrollingStateScrollingNode*);
void setWheelEventHandlerCountForNode(unsigned, ScrollingStateScrollingNode*);
void updateMainFrameScrollLayerPosition();
void scheduleTreeStateCommit();
void scrollingStateTreeCommitterTimerFired(Timer<ScrollingCoordinatorMac>*);
void commitTreeState();
OwnPtr<ScrollingStateTree> m_scrollingStateTree;
RefPtr<ScrollingTree> m_scrollingTree;
Timer<ScrollingCoordinatorMac> m_scrollingStateTreeCommitterTimer;
};
} // namespace WebCore
#endif // ENABLE(THREADED_SCROLLING)
#endif // ScrollingCoordinatorMac_h
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