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