/* * Copyright (C) 2016 Igalia S.L. * * 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 #include "FloatPoint.h" #include "ScrollAnimation.h" #include "Timer.h" #include <wtf/Optional.h> namespace WebCore { class ScrollableArea; class ScrollAnimationKinetic final: public ScrollAnimation { private: class PerAxisData { public: PerAxisData(double lower, double upper, double initialPosition, double initialVelocity); double position() { return m_position; } bool animateScroll(Seconds timeDelta); private: double m_lower { 0 }; double m_upper { 0 }; double m_coef1 { 0 }; double m_coef2 { 0 }; Seconds m_elapsedTime; double m_position { 0 }; double m_velocity { 0 }; }; public: ScrollAnimationKinetic(ScrollableArea&, std::function<void(FloatPoint&&)>&& notifyPositionChangedFunction); virtual ~ScrollAnimationKinetic(); void start(const FloatPoint& initialPosition, const FloatPoint& velocity, bool mayHScroll, bool mayVScroll); private: void stop() override; void animationTimerFired(); std::function<void(FloatPoint&&)> m_notifyPositionChangedFunction; std::optional<PerAxisData> m_horizontalData; std::optional<PerAxisData> m_verticalData; MonotonicTime m_startTime; Timer m_animationTimer; FloatPoint m_position; }; } // namespace WebCore