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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 "GraphicsLayer.h"
#include "IntRect.h"
#include "PlatformWheelEvent.h"
#include "ScrollTypes.h"
#include "Timer.h"
#include <wtf/Forward.h>
#if ENABLE(THREADED_SCROLLING)
#include "ScrollingTreeState.h"
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/Threading.h>
#endif
#if PLATFORM(MAC)
#include <wtf/RetainPtr.h>
#endif
namespace WebCore {
class FrameView;
class GraphicsLayer;
class Page;
class Region;
class ScrollableArea;
class ScrollingCoordinatorPrivate;
class ScrollingTreeState;
#if ENABLE(THREADED_SCROLLING)
class ScrollingTree;
#endif
class ScrollingCoordinator : public ThreadSafeRefCounted<ScrollingCoordinator> {
public:
static PassRefPtr<ScrollingCoordinator> create(Page*);
~ScrollingCoordinator();
void pageDestroyed();
#if ENABLE(THREADED_SCROLLING)
ScrollingTree* scrollingTree() const;
void commitTreeStateIfNeeded();
#endif
// Return whether this scrolling coordinator handles scrolling for the given frame view.
bool coordinatesScrollingForFrameView(FrameView*) const;
// Should be called whenever the given frame view has been laid out.
void frameViewLayoutUpdated(FrameView*);
// 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*);
// Should be called whenever the horizontal scrollbar layer for the given frame view changes.
void frameViewHorizontalScrollbarLayerDidChange(FrameView*, GraphicsLayer* horizontalScrollbarLayer);
// Should be called whenever the vertical scrollbar layer for the given frame view changes.
void frameViewVerticalScrollbarLayerDidChange(FrameView*, GraphicsLayer* verticalScrollbarLayer);
// Should be called whenever the scrollable layer for the given scroll area changes.
void scrollableAreaScrollLayerDidChange(ScrollableArea*, GraphicsLayer*);
// 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.
bool requestScrollPositionUpdate(FrameView*, const IntPoint&);
// Handle the wheel event on the scrolling thread. Returns whether the event was handled or not.
bool handleWheelEvent(FrameView*, const PlatformWheelEvent&);
// Dispatched by the scrolling tree whenever the main frame scroll position changes.
void updateMainFrameScrollPosition(const IntPoint&);
// Dispatched by the scrolling tree whenever the main frame scroll position changes and the scroll layer position needs to be updated as well.
void updateMainFrameScrollPositionAndScrollLayerPosition();
#if PLATFORM(MAC) || (PLATFORM(CHROMIUM) && OS(DARWIN))
// Dispatched by the scrolling tree during handleWheelEvent. This is required as long as scrollbars are painted on the main thread.
void handleWheelEventPhase(PlatformWheelEventPhase);
#endif
// Force all scroll layer position updates to happen on the main thread.
void setForceMainThreadScrollLayerPositionUpdates(bool);
// Return whether this scrolling coordinator can keep fixed position layers fixed to their
// containers while scrolling.
bool supportsFixedPositionLayers() const;
// Mark/unmark a layer as a container for fixed position layers.
void setLayerIsContainerForFixedPositionLayers(GraphicsLayer*, bool);
// Attach/detach layer position to ancestor fixed position container.
void setLayerIsFixedToContainerLayer(GraphicsLayer*, bool);
private:
explicit ScrollingCoordinator(Page*);
void recomputeWheelEventHandlerCount();
bool hasNonLayerViewportConstrainedObjects(FrameView*);
void updateShouldUpdateScrollLayerPositionOnMainThreadReason();
void setScrollLayer(GraphicsLayer*);
void setNonFastScrollableRegion(const Region&);
struct ScrollParameters {
ScrollElasticity horizontalScrollElasticity;
ScrollElasticity verticalScrollElasticity;
bool hasEnabledHorizontalScrollbar;
bool hasEnabledVerticalScrollbar;
ScrollbarMode horizontalScrollbarMode;
ScrollbarMode verticalScrollbarMode;
IntPoint scrollOrigin;
IntRect viewportRect;
IntSize contentsSize;
};
void setScrollParameters(const ScrollParameters&);
void setWheelEventHandlerCount(unsigned);
#if ENABLE(THREADED_SCROLLING)
void setShouldUpdateScrollLayerPositionOnMainThreadReason(ReasonForUpdatingScrollLayerPositionOnMainThreadFlags);
#endif
void updateMainFrameScrollLayerPosition();
Page* m_page;
bool m_forceMainThreadScrollLayerPositionUpdates;
#if ENABLE(THREADED_SCROLLING)
void scheduleTreeStateCommit();
void scrollingTreeStateCommitterTimerFired(Timer<ScrollingCoordinator>*);
void commitTreeState();
OwnPtr<ScrollingTreeState> m_scrollingTreeState;
RefPtr<ScrollingTree> m_scrollingTree;
Timer<ScrollingCoordinator> m_scrollingTreeStateCommitterTimer;
#endif
ScrollingCoordinatorPrivate* m_private;
};
} // namespace WebCore
#endif // ScrollingCoordinator_h
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