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 "cc/cc_export.h"
   9 #include "cc/scrollbar_animation_controller.h"
  10
  11 namespace cc {
  12
  13 class CC_EXPORT ScrollbarAnimationControllerLinearFade : public ScrollbarAnimationController {
  14 public:
  15     static scoped_ptr<ScrollbarAnimationControllerLinearFade> create(LayerImpl* scrollLayer, double fadeoutDelay, double fadeoutLength);
  16
  17     virtual ~ScrollbarAnimationControllerLinearFade();
  18
  19     virtual bool animate(double monotonicTime) OVERRIDE;
  20
  21     virtual void didPinchGestureUpdateAtTime(double monotonicTime) OVERRIDE;
  22     virtual void didPinchGestureEndAtTime(double monotonicTime) OVERRIDE;
  23     virtual void updateScrollOffsetAtTime(LayerImpl* scrollLayer, double monotonicTime) OVERRIDE;
  24
  25 protected:
  26     ScrollbarAnimationControllerLinearFade(LayerImpl* scrollLayer, double fadeoutDelay, double fadeoutLength);
  27
  28 private:
  29     float opacityAtTime(double monotonicTime);
  30
  31     double m_lastAwakenTime;
  32     bool m_pinchGestureInEffect;
  33
  34     double m_fadeoutDelay;
  35     double m_fadeoutLength;
  36 };
  37
  38 } // namespace cc
  39
  40 #endif  // CC_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_