/* * Copyright (C) 2012 Google 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 WheelFlingPlatformGestureCurve_h #define WheelFlingPlatformGestureCurve_h #include "FloatPoint.h" #include "PlatformGestureCurve.h" #include <wtf/OwnPtr.h> #include <wtf/PassOwnPtr.h> namespace WebCore { class PlatformGestureCurveTarget; // Implementation of PlatformGestureCurve suitable for mouse wheel-based fling // scroll. A Rayleigh distribtution curve is used to define the velocity profile, // so velocity starts at zero, accelerates to a maximum proportional to 'velocity', // then gently tails off to zero again. class WheelFlingPlatformGestureCurve : public PlatformGestureCurve { public: static PassOwnPtr<PlatformGestureCurve> create(const FloatPoint& velocity); virtual ~WheelFlingPlatformGestureCurve(); virtual const char* debugName() const { return "WheelFling"; } virtual bool apply(double time, PlatformGestureCurveTarget*); private: WheelFlingPlatformGestureCurve(const FloatPoint& velocity); FloatPoint m_velocity; IntPoint m_cumulativeScroll; }; } // namespace WebCore #endif