73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
/*
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* Copyright (C) 2020 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(ASYNC_SCROLLING)
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#include "ScrollTypes.h"
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#include <wtf/Lock.h>
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#include <wtf/Markable.h>
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#include <wtf/MonotonicTime.h>
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#include <wtf/OptionSet.h>
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namespace WebCore {
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class PlatformWheelEvent;
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enum class WheelEventProcessingSteps : uint8_t;
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class ScrollingTreeLatchingController {
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public:
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struct ScrollingNodeAndProcessingSteps {
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ScrollingNodeID scrollingNodeID;
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OptionSet<WheelEventProcessingSteps> processingSteps;
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};
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ScrollingTreeLatchingController();
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void receivedWheelEvent(const PlatformWheelEvent&, OptionSet<WheelEventProcessingSteps>, bool allowLatching);
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std::optional<ScrollingNodeAndProcessingSteps> latchingDataForEvent(const PlatformWheelEvent&, bool allowLatching) const;
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void nodeDidHandleEvent(ScrollingNodeID, OptionSet<WheelEventProcessingSteps>, const PlatformWheelEvent&, bool allowLatching);
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std::optional<ScrollingNodeID> latchedNodeID() const;
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std::optional<ScrollingNodeAndProcessingSteps> latchedNodeAndSteps() const;
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void nodeWasRemoved(ScrollingNodeID);
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void clearLatchedNode();
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private:
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bool latchedNodeIsRelevant() const;
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mutable Lock m_latchedNodeLock;
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std::optional<ScrollingNodeAndProcessingSteps> m_latchedNodeAndSteps WTF_GUARDED_BY_LOCK(m_latchedNodeLock);
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std::optional<OptionSet<WheelEventProcessingSteps>> m_processingStepsForCurrentGesture;
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MonotonicTime m_lastLatchedNodeInterationTime;
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};
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}
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#endif // ENABLE(ASYNC_SCROLLING)
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