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/*
* Copyright (C) 2020 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.
*/
#pragma once
#if ENABLE(ASYNC_SCROLLING)
#include "ScrollTypes.h"
#include <wtf/Markable.h>
namespace WebCore {
class PlatformWheelEvent;
class ScrollingTree;
// This class tracks state related to MayBegin, Begin, Ended and Canceled wheel events, which
// should propagate to the main thread in order to update overlay scrollbars.
class ScrollingTreeGestureState {
public:
ScrollingTreeGestureState(ScrollingTree&);
void receivedWheelEvent(const PlatformWheelEvent&);
bool handleGestureCancel(const PlatformWheelEvent&);
void nodeDidHandleEvent(ScrollingNodeID, const PlatformWheelEvent&);
private:
void clearAllNodes();
ScrollingTree& m_scrollingTree;
Markable<ScrollingNodeID> m_mayBeginNodeID;
Markable<ScrollingNodeID> m_activeNodeID;
};
}
#endif // ENABLE(ASYNC_SCROLLING)
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