TouchpadFlingPlatformGestureCurve.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 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
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#ifndef TouchpadFlingPlatformGestureCurve_h
#define TouchpadFlingPlatformGestureCurve_h

#include "FloatPoint.h"
#include "PlatformGestureCurve.h"
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>

namespace WebCore {

class PlatformGestureCurveTarget;

// Implementation of PlatformGestureCurve suitable for touch pad/screen-based
// fling scroll. Starts with a flat velocity profile based on 'velocity', which
// tails off to zero. Time is scaled to that duration of the fling is proportional
// the initial velocity.
class TouchpadFlingPlatformGestureCurve : public PlatformGestureCurve {
public:
    static PassOwnPtr<PlatformGestureCurve> create(const FloatPoint& velocity, IntPoint cumulativeScroll = IntPoint());
    static PassOwnPtr<PlatformGestureCurve> create(const FloatPoint& velocity, float p0, float p1, float p2, float p3, float p4, float curveDuration, IntPoint cumulativeScroll = IntPoint());
    virtual ~TouchpadFlingPlatformGestureCurve();

    virtual const char* debugName() const { return "TouchpadFling"; }
    virtual bool apply(double monotonicTime, PlatformGestureCurveTarget*);

private:
    TouchpadFlingPlatformGestureCurve(const FloatPoint& velocity, float p0, float p1, float p2, float p3, float p4, float curveDuration, const IntPoint& cumulativeScroll);

    FloatPoint m_displacementRatio;
    IntPoint m_cumulativeScroll;
    float m_coeffs[5];
    float m_timeOffset;
    float m_curveDuration;
    float m_positionOffset;

    static const int m_maxSearchIterations;
};

} // namespace WebCore

#endif