edge_effect.h revision eb525c5499e34cc9c4b825d6d9e75bb07cc06ace 
1// Copyright (c) 2013 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 CONTENT_BROWSER_ANDROID_EDGE_EFFECT_H_
6#define CONTENT_BROWSER_ANDROID_EDGE_EFFECT_H_
7
8#include "base/basictypes.h"
9#include "base/memory/ref_counted.h"
10#include "base/time/time.h"
11#include "ui/gfx/size_f.h"
12
13namespace cc {
14class Layer;
15}
16
17namespace content {
18
19/* |EdgeEffect| mirrors its Android counterpart, EdgeEffect.java.
20 * The primary difference is ownership; the Android version manages render
21 * resources directly, while this version simply applies the effect to
22 * existing resources. Conscious tradeoffs were made to align this as closely
23 * as possible with the original Android java version.
24 */
25class EdgeEffect {
26public:
27  enum Edge {
28    EDGE_TOP = 0,
29    EDGE_LEFT,
30    EDGE_BOTTOM,
31    EDGE_RIGHT,
32    EDGE_COUNT
33  };
34
35  EdgeEffect(scoped_refptr<cc::Layer> edge, scoped_refptr<cc::Layer> glow);
36  ~EdgeEffect();
37
38  void Pull(base::TimeTicks current_time, float delta_distance);
39  void Absorb(base::TimeTicks current_time, float velocity);
40  bool Update(base::TimeTicks current_time);
41  void Release(base::TimeTicks current_time);
42
43  void Finish();
44  bool IsFinished() const;
45
46  void ApplyToLayers(gfx::SizeF size, Edge edge);
47
48private:
49
50  enum State {
51    STATE_IDLE = 0,
52    STATE_PULL,
53    STATE_ABSORB,
54    STATE_RECEDE,
55    STATE_PULL_DECAY
56  };
57
58  scoped_refptr<cc::Layer> edge_;
59  scoped_refptr<cc::Layer> glow_;
60
61  float edge_alpha_;
62  float edge_scale_y_;
63  float glow_alpha_;
64  float glow_scale_y_;
65
66  float edge_alpha_start_;
67  float edge_alpha_finish_;
68  float edge_scale_y_start_;
69  float edge_scale_y_finish_;
70  float glow_alpha_start_;
71  float glow_alpha_finish_;
72  float glow_scale_y_start_;
73  float glow_scale_y_finish_;
74
75  base::TimeTicks start_time_;
76  base::TimeDelta duration_;
77
78  State state_;
79
80  float pull_distance_;
81
82  float dpi_scale_;
83
84  DISALLOW_COPY_AND_ASSIGN(EdgeEffect);
85};
86
87}  // namespace content
88
89#endif  // CONTENT_BROWSER_ANDROID_EDGE_EFFECT_H_
90