cc/animation/scrollbar_animation_controller_linear_fade.h

   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       ScrollbarAnimationControllerClient* client,
  21       base::TimeDelta delay_before_starting,
  22       base::TimeDelta duration);
  23
  24   virtual ~ScrollbarAnimationControllerLinearFade();
  25
  26   virtual void DidScrollUpdate() OVERRIDE;
  27
  28  protected:
  29   ScrollbarAnimationControllerLinearFade(
  30       LayerImpl* scroll_layer,
  31       ScrollbarAnimationControllerClient* client,
  32       base::TimeDelta delay_before_starting,
  33       base::TimeDelta duration);
  34
  35   virtual void RunAnimationFrame(float progress) OVERRIDE;
  36
  37  private:
  38   float OpacityAtTime(base::TimeTicks now) const;
  39   void ApplyOpacityToScrollbars(float opacity);
  40
  41   LayerImpl* scroll_layer_;
  42
  43   DISALLOW_COPY_AND_ASSIGN(ScrollbarAnimationControllerLinearFade);
  44 };
  45
  46 }  // namespace cc
  47
  48 #endif  // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_