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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef WEBKIT_GLUE_TOUCH_FLING_GESTURE_CURVE_H_
#define WEBKIT_GLUE_TOUCH_FLING_GESTURE_CURVE_H_
#include "third_party/WebKit/public/platform/WebFloatPoint.h"
#include "third_party/WebKit/public/platform/WebFloatSize.h"
#include "third_party/WebKit/public/platform/WebGestureCurve.h"
#include "third_party/WebKit/public/platform/WebSize.h"
#include "webkit/glue/webkit_glue_export.h"
namespace WebKit {
class WebGestureCurveTarget;
}
namespace webkit_glue {
// Implementation of WebGestureCurve 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 to the initial velocity.
class TouchFlingGestureCurve : public WebKit::WebGestureCurve {
public:
WEBKIT_GLUE_EXPORT static WebGestureCurve* Create(
const WebKit::WebFloatPoint& initial_velocity,
float p0, float p1, float p2,
const WebKit::WebSize& cumulativeScroll);
virtual bool apply(double monotonicTime,
WebKit::WebGestureCurveTarget*) OVERRIDE;
private:
TouchFlingGestureCurve(const WebKit::WebFloatPoint& initial_velocity,
float p0,
float p1,
float p2,
const WebKit::WebSize& cumulativeScroll);
virtual ~TouchFlingGestureCurve();
WebKit::WebFloatPoint displacement_ratio_;
WebKit::WebFloatSize cumulative_scroll_;
float coefficients_[3];
float time_offset_;
float curve_duration_;
float position_offset_;
DISALLOW_COPY_AND_ASSIGN(TouchFlingGestureCurve);
};
} // namespace webkit_glue
#endif // WEBKIT_GLUE_TOUCH_FLING_GESTURE_CURVE_H_
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