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/*
* Copyright (c) 2011, 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 ScrollAnimatorNone_h
#define ScrollAnimatorNone_h
#if ENABLE(SMOOTH_SCROLLING)
#if !ENABLE(REQUEST_ANIMATION_FRAME)
#error "SMOOTH_SCROLLING requires REQUEST_ANIMATION_FRAME to be enabled."
#endif
#include "FloatPoint.h"
#include "ScrollAnimator.h"
#include "Timer.h"
#include <wtf/OwnPtr.h>
class ScrollAnimatorNoneTest;
namespace WebCore {
class IntPoint;
class ActivePlatformGestureAnimation;
struct ScrollAnimatorParameters;
class ScrollAnimatorNone : public ScrollAnimator {
public:
explicit ScrollAnimatorNone(ScrollableArea*);
virtual ~ScrollAnimatorNone();
virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, float multiplier);
virtual void scrollToOffsetWithoutAnimation(const FloatPoint&);
#if !USE(REQUEST_ANIMATION_FRAME_TIMER)
virtual void cancelAnimations();
virtual void serviceScrollAnimations();
#endif
virtual void willEndLiveResize();
virtual void didAddVerticalScrollbar(Scrollbar*);
virtual void didAddHorizontalScrollbar(Scrollbar*);
enum Curve {
Linear,
Quadratic,
Cubic,
Quartic,
Bounce
};
struct Parameters {
Parameters();
Parameters(bool isEnabled, double animationTime, double repeatMinimumSustainTime, Curve attackCurve, double attackTime, Curve releaseCurve, double releaseTime, Curve coastTimeCurve, double maximumCoastTime);
// Note that the times can be overspecified such that releaseTime or releaseTime and attackTime are greater
// than animationTime. animationTime takes priority over releaseTime, capping it. attackTime is capped at
// whatever time remains, or zero if none.
bool m_isEnabled;
double m_animationTime;
double m_repeatMinimumSustainTime;
Curve m_attackCurve;
double m_attackTime;
Curve m_releaseCurve;
double m_releaseTime;
Curve m_coastTimeCurve;
double m_maximumCoastTime;
};
protected:
virtual void animationWillStart() { }
virtual void animationDidFinish() { }
Parameters parametersForScrollGranularity(ScrollGranularity) const;
friend class ::ScrollAnimatorNoneTest;
struct PerAxisData {
PerAxisData(ScrollAnimatorNone* parent, float* currentPos, int visibleLength);
void reset();
bool updateDataFromParameters(float step, float multiplier, float scrollableSize, double currentTime, Parameters*);
bool animateScroll(double currentTime);
void updateVisibleLength(int visibleLength);
static double curveAt(Curve, double t);
static double attackCurve(Curve, double deltaT, double curveT, double startPos, double attackPos);
static double releaseCurve(Curve, double deltaT, double curveT, double releasePos, double desiredPos);
static double coastCurve(Curve, double factor);
static double curveIntegralAt(Curve, double t);
static double attackArea(Curve, double startT, double endT);
static double releaseArea(Curve, double startT, double endT);
float* m_currentPosition;
double m_currentVelocity;
double m_desiredPosition;
double m_desiredVelocity;
double m_startPosition;
double m_startTime;
double m_startVelocity;
double m_animationTime;
double m_lastAnimationTime;
double m_attackPosition;
double m_attackTime;
Curve m_attackCurve;
double m_releasePosition;
double m_releaseTime;
Curve m_releaseCurve;
int m_visibleLength;
};
#if USE(REQUEST_ANIMATION_FRAME_TIMER)
void animationTimerFired(Timer<ScrollAnimatorNone>*);
void startNextTimer(double delay);
#else
void startNextTimer();
#endif
void animationTimerFired();
void stopAnimationTimerIfNeeded();
bool animationTimerActive();
void updateVisibleLengths();
PerAxisData m_horizontalData;
PerAxisData m_verticalData;
double m_startTime;
#if USE(REQUEST_ANIMATION_FRAME_TIMER)
Timer<ScrollAnimatorNone> m_animationTimer;
#else
bool m_animationActive;
#endif
};
} // namespace WebCore
#endif // ENABLE(SMOOTH_SCROLLING)
#endif // ScrollAnimatorNone_h
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