ActivePlatformGestureAnimation.h   [plain text]

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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#ifndef ActivePlatformGestureAnimation_h
#define ActivePlatformGestureAnimation_h

#include <wtf/Noncopyable.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>

namespace WebCore {

class PlatformGestureCurve;
class PlatformGestureCurveTarget;

// Implements a gesture animation (fling scroll, etc.) using a curve with a generic interface
// to define the animation parameters as a function of time, and applies the animation
// to a target, again via a generic interface. It is assumed that animate() is called
// on a more-or-less regular basis by the owner.
class ActivePlatformGestureAnimation {
    WTF_MAKE_NONCOPYABLE(ActivePlatformGestureAnimation);
public:
    static PassOwnPtr<ActivePlatformGestureAnimation> create(PassOwnPtr<PlatformGestureCurve>, PlatformGestureCurveTarget*);
    static PassOwnPtr<ActivePlatformGestureAnimation> create(PassOwnPtr<PlatformGestureCurve>, PlatformGestureCurveTarget*, double startTime);
    ~ActivePlatformGestureAnimation();

    bool animate(double time);

private:
    // Assumes a valid PlatformGestureCurveTarget that outlives the animation.
    ActivePlatformGestureAnimation(PassOwnPtr<PlatformGestureCurve>, PlatformGestureCurveTarget*);
    ActivePlatformGestureAnimation(PassOwnPtr<PlatformGestureCurve>, PlatformGestureCurveTarget*, double startTime);

    double m_startTime;
    bool m_waitingForFirstTick;
    OwnPtr<PlatformGestureCurve> m_curve;
    PlatformGestureCurveTarget* m_target;
};

} // namespace WebCore

#endif