/* * Copyright (C) 2011 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. */ #ifndef ScrollAnimatorIOS_h #define ScrollAnimatorIOS_h #include "ScrollAnimator.h" #include "IntPoint.h" namespace WebCore { class PlatformTouchEvent; class ScrollAnimatorIOS : public ScrollAnimator { public: ScrollAnimatorIOS(ScrollableArea*); virtual ~ScrollAnimatorIOS(); virtual bool handleTouchEvent(const PlatformTouchEvent&) OVERRIDE; private: void determineScrollableAreaForTouchSequence(const IntSize& touchDelta); // State for handling sequences of touches in defaultTouchEventHandler. enum AxisLatch { AxisLatchNotComputed, AxisLatchNone, AxisLatchHorizontal, AxisLatchVertical }; AxisLatch m_touchScrollAxisLatch; bool m_inTouchSequence; bool m_committedToScrollAxis; bool m_startedScroll; 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; }; } // namespace WebCore #endif // ScrollAnimatorIOS_h