74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
/*
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* Copyright (C) 2011, 2015 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 PLATFORM(IOS_FAMILY)
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#include "ScrollAnimator.h"
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#include "IntPoint.h"
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namespace WebCore {
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class PlatformTouchEvent;
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class ScrollAnimatorIOS : public ScrollAnimator {
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public:
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ScrollAnimatorIOS(ScrollableArea&);
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virtual ~ScrollAnimatorIOS();
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#if ENABLE(TOUCH_EVENTS)
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bool handleTouchEvent(const PlatformTouchEvent&) override;
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#endif
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private:
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#if ENABLE(TOUCH_EVENTS)
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void determineScrollableAreaForTouchSequence(const IntSize& touchDelta);
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// State for handling sequences of touches in defaultTouchEventHandler.
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enum AxisLatch {
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AxisLatchNotComputed,
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AxisLatchNone,
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AxisLatchHorizontal,
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AxisLatchVertical
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};
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AxisLatch m_touchScrollAxisLatch;
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bool m_inTouchSequence;
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bool m_committedToScrollAxis;
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bool m_startedScroll;
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IntPoint m_firstTouchPoint;
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IntPoint m_lastTouchPoint;
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// When we're in a touch sequence, this will point to the scrollable area that
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// should actually be scrolled during the sequence.
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ScrollableArea* m_scrollableAreaForTouchSequence;
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#endif
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};
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} // namespace WebCore
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#endif // PLATFORM(IOS_FAMILY)
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