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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef WEBKIT_CHILD_TOUCH_FLING_GESTURE_CURVE_H_ | |
6 #define WEBKIT_CHILD_TOUCH_FLING_GESTURE_CURVE_H_ | |
7 | |
8 #include "third_party/WebKit/public/platform/WebFloatPoint.h" | |
9 #include "third_party/WebKit/public/platform/WebFloatSize.h" | |
10 #include "third_party/WebKit/public/platform/WebGestureCurve.h" | |
11 #include "third_party/WebKit/public/platform/WebSize.h" | |
12 #include "webkit/child/webkit_child_export.h" | |
13 | |
14 namespace WebKit { | |
15 class WebGestureCurveTarget; | |
16 } | |
17 | |
18 namespace webkit_glue { | |
19 | |
20 // Implementation of WebGestureCurve suitable for touch pad/screen-based | |
21 // fling scroll. Starts with a flat velocity profile based on 'velocity', which | |
22 // tails off to zero. Time is scaled to that duration of the fling is | |
23 // proportional to the initial velocity. | |
24 class TouchFlingGestureCurve : public WebKit::WebGestureCurve { | |
25 public: | |
26 | |
27 WEBKIT_CHILD_EXPORT static WebGestureCurve* Create( | |
28 const WebKit::WebFloatPoint& initial_velocity, | |
29 float p0, float p1, float p2, | |
30 const WebKit::WebSize& cumulativeScroll); | |
31 | |
32 virtual bool apply(double monotonicTime, | |
33 WebKit::WebGestureCurveTarget*) OVERRIDE; | |
34 | |
35 private: | |
36 TouchFlingGestureCurve(const WebKit::WebFloatPoint& initial_velocity, | |
37 float p0, | |
38 float p1, | |
39 float p2, | |
40 const WebKit::WebSize& cumulativeScroll); | |
41 virtual ~TouchFlingGestureCurve(); | |
42 | |
43 WebKit::WebFloatPoint displacement_ratio_; | |
44 WebKit::WebFloatSize cumulative_scroll_; | |
45 float coefficients_[3]; | |
46 float time_offset_; | |
47 float curve_duration_; | |
48 float position_offset_; | |
49 | |
50 DISALLOW_COPY_AND_ASSIGN(TouchFlingGestureCurve); | |
51 }; | |
52 | |
53 } // namespace webkit_glue | |
54 | |
55 #endif // WEBKIT_CHILD_TOUCH_FLING_GESTURE_CURVE_H_ | |
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