content/browser/android/edge_effect_base.h

   1 // Copyright 2014 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_BASE_H_
   6 #define CONTENT_BROWSER_ANDROID_EDGE_EFFECT_BASE_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/time/time.h"
  10 #include "ui/gfx/geometry/size_f.h"
  11 #include "ui/gfx/transform.h"
  12
  13 namespace cc {
  14 class Layer;
  15 }
  16
  17 namespace content {
  18
  19 // A base class for overscroll-related Android effects.
  20 class EdgeEffectBase {
  21  public:
  22   enum State {
  23     STATE_IDLE = 0,
  24     STATE_PULL,
  25     STATE_ABSORB,
  26     STATE_RECEDE,
  27     STATE_PULL_DECAY
  28   };
  29
  30   virtual ~EdgeEffectBase() {}
  31
  32   virtual void Pull(base::TimeTicks current_time,
  33                     float delta_distance,
  34                     float displacement) = 0;
  35   virtual void Absorb(base::TimeTicks current_time, float velocity) = 0;
  36   virtual bool Update(base::TimeTicks current_time) = 0;
  37   virtual void Release(base::TimeTicks current_time) = 0;
  38
  39   virtual void Finish() = 0;
  40   virtual bool IsFinished() const = 0;
  41   virtual float GetAlpha() const = 0;
  42
  43   virtual void ApplyToLayers(const gfx::SizeF& size,
  44                              const gfx::Transform& transform) = 0;
  45   virtual void SetParent(cc::Layer* parent) = 0;
  46 };
  47
  48 }  // namespace content
  49
  50 #endif  // CONTENT_BROWSER_ANDROID_EDGE_EFFECT_BASE_H_