cc/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_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_
   6 #define CC_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "cc/cc_export.h"
  10 #include "cc/scrollbar_animation_controller.h"
  11
  12 namespace cc {
  13 class LayerImpl;
  14
  15 class CC_EXPORT ScrollbarAnimationControllerLinearFade : public ScrollbarAnimationController {
  16 public:
  17     static scoped_ptr<ScrollbarAnimationControllerLinearFade> create(LayerImpl* scrollLayer, double fadeoutDelay, double fadeoutLength);
  18
  19     virtual ~ScrollbarAnimationControllerLinearFade();
  20
  21     // ScrollbarAnimationController overrides.
  22     virtual bool animate(base::TimeTicks) OVERRIDE;
  23     virtual void didPinchGestureUpdate(base::TimeTicks) OVERRIDE;
  24     virtual void didPinchGestureEnd(base::TimeTicks) OVERRIDE;
  25     virtual void didUpdateScrollOffset(base::TimeTicks) OVERRIDE;
  26
  27 protected:
  28     ScrollbarAnimationControllerLinearFade(LayerImpl* scrollLayer, double fadeoutDelay, double fadeoutLength);
  29
  30 private:
  31     float opacityAtTime(base::TimeTicks);
  32
  33     LayerImpl* m_scrollLayer;
  34
  35     base::TimeTicks m_lastAwakenTime;
  36     bool m_pinchGestureInEffect;
  37
  38     double m_fadeoutDelay;
  39     double m_fadeoutLength;
  40
  41     double m_currentTimeForTesting;
  42 };
  43
  44 } // namespace cc
  45
  46 #endif  // CC_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_