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/*
* Copyright (C) 2011 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 ScrollingCoordinator_h
#define ScrollingCoordinator_h
#include "core/rendering/RenderObject.h"
#include "platform/PlatformWheelEvent.h"
#include "platform/geometry/IntRect.h"
#include "platform/scroll/ScrollTypes.h"
#include "wtf/text/WTFString.h"
namespace blink {
class WebLayer;
class WebScrollbarLayer;
}
namespace WebCore {
typedef unsigned MainThreadScrollingReasons;
class Document;
class Frame;
class FrameView;
class GraphicsLayer;
class Page;
class Region;
class ScrollableArea;
class ViewportConstraints;
class ScrollingCoordinator : public RefCounted<ScrollingCoordinator> {
public:
static PassRefPtr<ScrollingCoordinator> create(Page*);
~ScrollingCoordinator();
void pageDestroyed();
// Return whether this scrolling coordinator handles scrolling for the given frame view.
bool coordinatesScrollingForFrameView(FrameView*) const;
// Called when any frame has done its layout.
void notifyLayoutUpdated();
// Should be called after compositing has been updated.
void updateAfterCompositingChange();
bool needsToUpdateAfterCompositingChange() const { return m_scrollGestureRegionIsDirty || m_touchEventTargetRectsAreDirty || frameViewIsScrollableIsDirty(); }
// Should be called whenever a wheel event handler is added or removed in the
// frame view's underlying document.
void frameViewWheelEventHandlerCountChanged(FrameView*);
// Should be called whenever the slow repaint objects counter changes between zero and one.
void frameViewHasSlowRepaintObjectsDidChange(FrameView*);
// Should be called whenever the set of fixed objects changes.
void frameViewFixedObjectsDidChange(FrameView*);
// Should be called whenever the root layer for the given frame view changes.
void frameViewRootLayerDidChange(FrameView*);
#if OS(MACOSX)
// Dispatched by the scrolling tree during handleWheelEvent. This is required as long as scrollbars are painted on the main thread.
void handleWheelEventPhase(PlatformWheelEventPhase);
#endif
enum MainThreadScrollingReasonFlags {
HasSlowRepaintObjects = 1 << 0,
HasViewportConstrainedObjectsWithoutSupportingFixedLayers = 1 << 1,
HasNonLayerViewportConstrainedObjects = 1 << 2,
};
MainThreadScrollingReasons mainThreadScrollingReasons() const;
bool shouldUpdateScrollLayerPositionOnMainThread() const { return mainThreadScrollingReasons() != 0; }
PassOwnPtr<blink::WebScrollbarLayer> createSolidColorScrollbarLayer(ScrollbarOrientation, int thumbThickness, bool isLeftSideVerticalScrollbar);
void willDestroyScrollableArea(ScrollableArea*);
// Returns true if the coordinator handled this change.
bool scrollableAreaScrollLayerDidChange(ScrollableArea*);
void scrollableAreaScrollbarLayerDidChange(ScrollableArea*, ScrollbarOrientation);
void setLayerIsContainerForFixedPositionLayers(GraphicsLayer*, bool);
void updateLayerPositionConstraint(RenderLayer*);
void touchEventTargetRectsDidChange(const Document*);
void willDestroyRenderLayer(RenderLayer*);
void updateScrollParentForGraphicsLayer(GraphicsLayer* child, RenderLayer* parent);
void updateClipParentForGraphicsLayer(GraphicsLayer* child, RenderLayer* parent);
static String mainThreadScrollingReasonsAsText(MainThreadScrollingReasons);
String mainThreadScrollingReasonsAsText() const;
Region computeShouldHandleScrollGestureOnMainThreadRegion(const Frame*, const IntPoint& frameLocation) const;
void updateTouchEventTargetRectsIfNeeded();
// For testing purposes only. This ScrollingCoordinator is reused between layout test, and must be reset
// for the results to be valid.
void reset();
protected:
explicit ScrollingCoordinator(Page*);
static GraphicsLayer* scrollLayerForScrollableArea(ScrollableArea*);
static GraphicsLayer* horizontalScrollbarLayerForScrollableArea(ScrollableArea*);
static GraphicsLayer* verticalScrollbarLayerForScrollableArea(ScrollableArea*);
bool isForMainFrame(ScrollableArea*) const;
unsigned computeCurrentWheelEventHandlerCount();
GraphicsLayer* scrollLayerForFrameView(FrameView*);
GraphicsLayer* counterScrollingLayerForFrameView(FrameView*);
Page* m_page;
// Dirty flags used to idenfity what really needs to be computed after compositing is updated.
bool m_scrollGestureRegionIsDirty;
bool m_touchEventTargetRectsAreDirty;
private:
void recomputeWheelEventHandlerCountForFrameView(FrameView*);
void setShouldUpdateScrollLayerPositionOnMainThread(MainThreadScrollingReasons);
bool hasVisibleSlowRepaintViewportConstrainedObjects(FrameView*) const;
void updateShouldUpdateScrollLayerPositionOnMainThread();
static blink::WebLayer* scrollingWebLayerForScrollableArea(ScrollableArea*);
bool touchHitTestingEnabled() const;
void setShouldHandleScrollGestureOnMainThreadRegion(const Region&);
void setTouchEventTargetRects(const LayerHitTestRects&);
void computeTouchEventTargetRects(LayerHitTestRects&);
void setWheelEventHandlerCount(unsigned);
blink::WebScrollbarLayer* addWebScrollbarLayer(ScrollableArea*, ScrollbarOrientation, PassOwnPtr<blink::WebScrollbarLayer>);
blink::WebScrollbarLayer* getWebScrollbarLayer(ScrollableArea*, ScrollbarOrientation);
void removeWebScrollbarLayer(ScrollableArea*, ScrollbarOrientation);
bool frameViewIsScrollableIsDirty() const;
typedef HashMap<ScrollableArea*, OwnPtr<blink::WebScrollbarLayer> > ScrollbarMap;
ScrollbarMap m_horizontalScrollbars;
ScrollbarMap m_verticalScrollbars;
HashSet<const RenderLayer*> m_layersWithTouchRects;
bool m_wasFrameScrollable;
// This is retained for testing.
MainThreadScrollingReasons m_lastMainThreadScrollingReasons;
};
} // namespace WebCore
#endif // ScrollingCoordinator_h
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