99 lines
3.3 KiB
C++
99 lines
3.3 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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#include "FloatSize.h"
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#include "ScrollTypes.h"
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#include "Timer.h"
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#include <wtf/RefPtr.h>
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#include <wtf/WeakPtr.h>
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#if ENABLE(WHEEL_EVENT_LATCHING)
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namespace WTF {
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class TextStream;
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}
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namespace WebCore {
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class Element;
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class Frame;
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class PlatformWheelEvent;
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class ScrollableArea;
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class ScrollLatchingController {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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ScrollLatchingController();
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~ScrollLatchingController();
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void clear();
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void receivedWheelEvent(const PlatformWheelEvent&);
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FloatSize cumulativeEventDelta() const { return m_cumulativeEventDelta; }
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// Frame containing latched scroller (may be the frame or some sub-scroller).
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Frame* latchedFrame() const;
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// Returns true if no frame is latched, or latching is in the given frame (in which case latchedScroller will be non-null).
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bool latchingAllowsScrollingInFrame(const Frame&, WeakPtr<ScrollableArea>& latchedScroller) const;
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void updateAndFetchLatchingStateForFrame(Frame&, const PlatformWheelEvent&, RefPtr<Element>& latchedElement, WeakPtr<ScrollableArea>&, bool& isOverWidget);
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void removeLatchingStateForTarget(const Element&);
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void removeLatchingStateForFrame(const Frame&);
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void dump(WTF::TextStream&) const;
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private:
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struct FrameState {
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WeakPtr<Element> wheelEventElement;
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WeakPtr<ScrollableArea> scrollableArea;
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Frame* frame { nullptr };
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bool isOverWidget { false };
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};
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void clearOrScheduleClearIfNeeded(const PlatformWheelEvent&);
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void clearTimerFired();
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bool hasStateForFrame(const Frame&) const;
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FrameState* stateForFrame(const Frame&);
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const FrameState* stateForFrame(const Frame&) const;
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bool shouldLatchToScrollableArea(const Frame&, ScrollableArea*, FloatSize) const;
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FloatSize m_cumulativeEventDelta;
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Vector<FrameState> m_frameStateStack;
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Timer m_clearLatchingStateTimer;
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};
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WTF::TextStream& operator<<(WTF::TextStream&, const ScrollLatchingController&);
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} // namespace WebCore
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#endif // ENABLE(WHEEL_EVENT_LATCHING)
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