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      1 // Copyright 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 CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_
      6 #define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_
      7 
      8 #include "base/memory/scoped_ptr.h"
      9 #include "cc/animation/scrollbar_animation_controller.h"
     10 #include "cc/base/cc_export.h"
     11 
     12 namespace cc {
     13 class LayerImpl;
     14 
     15 class CC_EXPORT ScrollbarAnimationControllerLinearFade
     16     : public ScrollbarAnimationController {
     17  public:
     18   static scoped_ptr<ScrollbarAnimationControllerLinearFade> Create(
     19       LayerImpl* scroll_layer,
     20       base::TimeDelta fadeout_delay,
     21       base::TimeDelta fadeout_length);
     22 
     23   virtual ~ScrollbarAnimationControllerLinearFade();
     24 
     25   // ScrollbarAnimationController overrides.
     26   virtual bool IsAnimating() const OVERRIDE;
     27   virtual base::TimeDelta DelayBeforeStart(base::TimeTicks now) const OVERRIDE;
     28 
     29   virtual bool Animate(base::TimeTicks now) OVERRIDE;
     30   virtual void DidScrollGestureBegin() OVERRIDE;
     31   virtual void DidScrollGestureEnd(base::TimeTicks now) OVERRIDE;
     32   virtual void DidMouseMoveOffScrollbar(base::TimeTicks now) OVERRIDE;
     33   virtual bool DidScrollUpdate(base::TimeTicks now) OVERRIDE;
     34   virtual bool DidMouseMoveNear(base::TimeTicks now, float distance) OVERRIDE;
     35 
     36  protected:
     37   ScrollbarAnimationControllerLinearFade(LayerImpl* scroll_layer,
     38                                          base::TimeDelta fadeout_delay,
     39                                          base::TimeDelta fadeout_length);
     40 
     41  private:
     42   float OpacityAtTime(base::TimeTicks now);
     43   void ApplyOpacityToScrollbars(float opacity);
     44 
     45   LayerImpl* scroll_layer_;
     46 
     47   base::TimeTicks last_awaken_time_;
     48   bool scroll_gesture_in_progress_;
     49   bool scroll_gesture_has_scrolled_;
     50 
     51   base::TimeDelta fadeout_delay_;
     52   base::TimeDelta fadeout_length_;
     53 
     54   DISALLOW_COPY_AND_ASSIGN(ScrollbarAnimationControllerLinearFade);
     55 };
     56 
     57 }  // namespace cc
     58 
     59 #endif  // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_
     60