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/*
* Copyright (C) 2016 Igalia S.L.
* Copyright (C) 2021 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
#include "FloatPoint.h"
#include "ScrollAnimation.h"
#include <wtf/TZoneMalloc.h>
namespace WebCore {
class PlatformWheelEvent;
class ScrollAnimationKinetic final : public ScrollAnimation {
WTF_MAKE_TZONE_ALLOCATED(ScrollAnimationKinetic);
private:
class PerAxisData {
public:
PerAxisData(double lower, double upper, double initialOffset, double initialVelocity);
double offset() { return m_offset; }
double velocity() { return m_velocity; }
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_offset { 0 };
double m_velocity { 0 };
};
public:
ScrollAnimationKinetic(ScrollAnimationClient&);
virtual ~ScrollAnimationKinetic();
bool startAnimatedScrollWithInitialVelocity(const FloatPoint& initialOffset, const FloatSize& velocity, const FloatSize& previousVelocity, bool mayHScroll, bool mayVScroll);
bool retargetActiveAnimation(const FloatPoint& newOffset) final;
void appendToScrollHistory(const PlatformWheelEvent&);
void clearScrollHistory();
FloatSize computeVelocity();
MonotonicTime startTime() { return m_startTime; }
FloatSize initialVelocity() { return m_initialVelocity; }
FloatPoint initialOffset() { return m_initialOffset; }
FloatSize accumulateVelocityFromPreviousGesture(const MonotonicTime, const FloatPoint&, const FloatSize&);
private:
void serviceAnimation(MonotonicTime) final;
String debugDescription() const final;
std::optional<PerAxisData> m_horizontalData;
std::optional<PerAxisData> m_verticalData;
Vector<PlatformWheelEvent> m_scrollHistory;
FloatPoint m_initialOffset;
FloatSize m_initialVelocity;
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_SCROLL_ANIMATION(WebCore::ScrollAnimationKinetic, type() == WebCore::ScrollAnimation::Type::Kinetic)
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