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/*
* 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.
*/
#ifndef ScrollAnimationSmooth_h
#define ScrollAnimationSmooth_h
#include "ScrollAnimation.h"
#if ENABLE(SMOOTH_SCROLLING)
#if !ENABLE(REQUEST_ANIMATION_FRAME)
#error "SMOOTH_SCROLLING requires REQUEST_ANIMATION_FRAME to be enabled."
#endif
#include "Timer.h"
namespace WebCore {
class FloatPoint;
class ScrollableArea;
class ScrollAnimationSmooth final: public ScrollAnimation {
public:
ScrollAnimationSmooth(ScrollableArea&, const FloatPoint&, std::function<void (FloatPoint&&)>&& notifyPositionChangedFunction);
virtual ~ScrollAnimationSmooth();
enum class Curve {
Linear,
Quadratic,
Cubic,
Quartic,
Bounce
};
private:
virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, float multiplier) override;
virtual void stop() override;
virtual void updateVisibleLengths() override;
virtual void setCurrentPosition(const FloatPoint&) override;
#if !USE(REQUEST_ANIMATION_FRAME_TIMER)
virtual void serviceAnimation() override;
#endif
struct PerAxisData {
PerAxisData() = delete;
PerAxisData(float position, int length)
: currentPosition(position)
, desiredPosition(position)
, visibleLength(length)
{
}
float currentPosition { 0 };
double currentVelocity { 0 };
double desiredPosition { 0 };
double desiredVelocity { 0 };
double startPosition { 0 };
double startTime { 0 };
double startVelocity { 0 };
double animationTime { 0 };
double lastAnimationTime { 0 };
double attackPosition { 0 };
double attackTime { 0 };
Curve attackCurve { Curve::Quadratic };
double releasePosition { 0 };
double releaseTime { 0 };
Curve releaseCurve { Curve::Quadratic };
int visibleLength { 0 };
};
bool updatePerAxisData(PerAxisData&, ScrollGranularity, float delta, float minScrollPosition, float maxScrollPosition);
bool animateScroll(PerAxisData&, double currentTime);
#if USE(REQUEST_ANIMATION_FRAME_TIMER)
void requestAnimationTimerFired();
void startNextTimer(double delay);
#else
void startNextTimer();
#endif
void animationTimerFired();
bool animationTimerActive() const;
std::function<void (FloatPoint&&)> m_notifyPositionChangedFunction;
PerAxisData m_horizontalData;
PerAxisData m_verticalData;
double m_startTime { 0 };
#if USE(REQUEST_ANIMATION_FRAME_TIMER)
Timer m_animationTimer;
#else
bool m_animationActive { false };
#endif
};
} // namespace WebCore
#endif // ENABLE(SMOOTH_SCROLLING)
#endif // ScrollAnimationSmooth_h
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