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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
#include "platform/Timer.h"
#include "platform/geometry/FloatPoint.h"
#include "platform/scroll/ScrollAnimator.h"
class ScrollAnimatorNoneTest;
namespace blink {
class IntPoint;
class ActivePlatformGestureAnimation;
struct ScrollAnimatorParameters;
class PLATFORM_EXPORT ScrollAnimatorNone : public ScrollAnimator {
public:
explicit ScrollAnimatorNone(ScrollableArea*);
virtual ~ScrollAnimatorNone();
virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, float delta) OVERRIDE;
virtual void scrollToOffsetWithoutAnimation(const FloatPoint&) OVERRIDE;
virtual void cancelAnimations() OVERRIDE;
virtual void serviceScrollAnimations() OVERRIDE;
virtual void willEndLiveResize() OVERRIDE;
virtual void didAddVerticalScrollbar(Scrollbar*) OVERRIDE;
virtual void didAddHorizontalScrollbar(Scrollbar*) OVERRIDE;
enum Curve {
Linear,
Quadratic,
Cubic,
Quartic,
Bounce
};
struct PLATFORM_EXPORT 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 PLATFORM_EXPORT PerAxisData {
PerAxisData(ScrollAnimatorNone* parent, float* currentPos, int visibleLength);
void reset();
bool updateDataFromParameters(float step, float delta, 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);
double newScrollAnimationPosition(double deltaTime);
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;
};
void startNextTimer();
void animationTimerFired();
void stopAnimationTimerIfNeeded();
bool animationTimerActive();
void updateVisibleLengths();
PerAxisData m_horizontalData;
PerAxisData m_verticalData;
double m_startTime;
bool m_animationActive;
};
} // namespace blink
#endif // ScrollAnimatorNone_h