content/browser/android/edge_effect.h

   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
  13 namespace cc {
  14 class Layer;
  15 }
  16
  17 namespace 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  */
  25 class EdgeEffect {
  26 public:
  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
  48 private:
  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_