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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 ScrollingTreeState_h
#define ScrollingTreeState_h
#if ENABLE(THREADED_SCROLLING)
#include "GraphicsLayer.h"
#include "IntRect.h"
#include "Region.h"
#include "ScrollTypes.h"
#include <wtf/PassOwnPtr.h>
#if PLATFORM(MAC)
#include <wtf/RetainPtr.h>
#endif
namespace WebCore {
// The ScrollingTreeState object keeps track of the current state of scrolling related properties.
// Whenever any properties change, the scrolling coordinator will be informed and will update the state
// and schedule a timer that will clone the new state and send it over to the scrolling thread, avoiding locking.
// FIXME: Once we support fast scrolling in subframes, this will have to become a tree-like structure.
class ScrollingTreeState {
public:
static PassOwnPtr<ScrollingTreeState> create();
~ScrollingTreeState();
enum ChangedProperty {
ViewportRect = 1 << 0,
ContentsSize = 1 << 1,
NonFastScrollableRegion = 1 << 2,
WheelEventHandlerCount = 1 << 3,
ShouldUpdateScrollLayerPositionOnMainThread = 1 << 4,
HorizontalScrollElasticity = 1 << 5,
VerticalScrollElasticity = 1 << 6,
HasEnabledHorizontalScrollbar = 1 << 7,
HasEnabledVerticalScrollbar = 1 << 8,
ScrollLayer = 1 << 9,
};
bool hasChangedProperties() const { return m_changedProperties; }
unsigned changedProperties() const { return m_changedProperties; }
const IntRect& viewportRect() const { return m_viewportRect; }
void setViewportRect(const IntRect&);
const IntSize& contentsSize() const { return m_contentsSize; }
void setContentsSize(const IntSize&);
const Region& nonFastScrollableRegion() const { return m_nonFastScrollableRegion; }
void setNonFastScrollableRegion(const Region&);
unsigned wheelEventHandlerCount() const { return m_wheelEventHandlerCount; }
void setWheelEventHandlerCount(unsigned);
bool shouldUpdateScrollLayerPositionOnMainThread() const { return m_shouldUpdateScrollLayerPositionOnMainThread; }
void setShouldUpdateScrollLayerPositionOnMainThread(bool);
ScrollElasticity horizontalScrollElasticity() const { return m_horizontalScrollElasticity; }
void setHorizontalScrollElasticity(ScrollElasticity);
ScrollElasticity verticalScrollElasticity() const { return m_verticalScrollElasticity; }
void setVerticalScrollElasticity(ScrollElasticity);
bool hasEnabledHorizontalScrollbar() const { return m_hasEnabledHorizontalScrollbar; }
void setHasEnabledHorizontalScrollbar(bool);
bool hasEnabledVerticalScrollbar() const { return m_hasEnabledVerticalScrollbar; }
void setHasEnabledVerticalScrollbar(bool);
PlatformLayer* platformScrollLayer() const;
void setScrollLayer(const GraphicsLayer*);
// Copies the current tree state and clears the changed properties mask in the original.
PassOwnPtr<ScrollingTreeState> commit();
private:
ScrollingTreeState();
unsigned m_changedProperties;
IntRect m_viewportRect;
IntSize m_contentsSize;
Region m_nonFastScrollableRegion;
unsigned m_wheelEventHandlerCount;
bool m_shouldUpdateScrollLayerPositionOnMainThread;
ScrollElasticity m_horizontalScrollElasticity;
ScrollElasticity m_verticalScrollElasticity;
bool m_hasEnabledHorizontalScrollbar;
bool m_hasEnabledVerticalScrollbar;
#if PLATFORM(MAC)
RetainPtr<PlatformLayer> m_platformScrollLayer;
#endif
};
} // namespace WebCore
#endif // ENABLE(THREADED_SCROLLING)
#endif // ScrollingTreeState_h
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