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      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 
     42   virtual void ApplyToLayers(const gfx::SizeF& size,
     43                              const gfx::Transform& transform) = 0;
     44   virtual void SetParent(cc::Layer* parent) = 0;
     45 };
     46 
     47 }  // namespace content
     48 
     49 #endif  // CONTENT_BROWSER_ANDROID_EDGE_EFFECT_BASE_H_
     50