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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 ScrollingTreeScrollingNode_h
#define ScrollingTreeScrollingNode_h
#if ENABLE(THREADED_SCROLLING)
#include "IntRect.h"
#include "ScrollTypes.h"
#include "ScrollingCoordinator.h"
#include "ScrollingTreeNode.h"
#include <wtf/PassOwnPtr.h>
namespace WebCore {
class PlatformWheelEvent;
class ScrollingTree;
class ScrollingStateScrollingNode;
class ScrollingTreeScrollingNode : public ScrollingTreeNode {
public:
static PassOwnPtr<ScrollingTreeScrollingNode> create(ScrollingTree*);
virtual ~ScrollingTreeScrollingNode();
virtual void update(ScrollingStateNode*) OVERRIDE;
virtual void handleWheelEvent(const PlatformWheelEvent&) = 0;
virtual void setScrollPosition(const IntPoint&) = 0;
MainThreadScrollingReasons shouldUpdateScrollLayerPositionOnMainThread() const { return m_shouldUpdateScrollLayerPositionOnMainThread; }
protected:
explicit ScrollingTreeScrollingNode(ScrollingTree*);
const IntRect& viewportRect() const { return m_viewportRect; }
const IntSize& contentsSize() const { return m_contentsSize; }
ScrollElasticity horizontalScrollElasticity() const { return m_horizontalScrollElasticity; }
ScrollElasticity verticalScrollElasticity() const { return m_verticalScrollElasticity; }
bool hasEnabledHorizontalScrollbar() const { return m_hasEnabledHorizontalScrollbar; }
bool hasEnabledVerticalScrollbar() const { return m_hasEnabledVerticalScrollbar; }
bool canHaveScrollbars() const { return m_horizontalScrollbarMode != ScrollbarAlwaysOff || m_verticalScrollbarMode != ScrollbarAlwaysOff; }
const IntPoint& scrollOrigin() const { return m_scrollOrigin; }
private:
IntRect m_viewportRect;
IntSize m_contentsSize;
IntPoint m_scrollOrigin;
MainThreadScrollingReasons m_shouldUpdateScrollLayerPositionOnMainThread;
ScrollElasticity m_horizontalScrollElasticity;
ScrollElasticity m_verticalScrollElasticity;
bool m_hasEnabledHorizontalScrollbar;
bool m_hasEnabledVerticalScrollbar;
ScrollbarMode m_horizontalScrollbarMode;
ScrollbarMode m_verticalScrollbarMode;
};
} // namespace WebCore
#endif // ENABLE(THREADED_SCROLLING)
#endif // ScrollingTreeScrollingNode_h
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