| // Copyright 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_ |
| #define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_ |
| |
| #include "base/memory/scoped_ptr.h" |
| #include "cc/animation/scrollbar_animation_controller.h" |
| #include "cc/base/cc_export.h" |
| |
| namespace cc { |
| class LayerImpl; |
| |
| class CC_EXPORT ScrollbarAnimationControllerLinearFade |
| : public ScrollbarAnimationController { |
| public: |
| static scoped_ptr<ScrollbarAnimationControllerLinearFade> Create( |
| LayerImpl* scroll_layer, |
| base::TimeDelta fadeout_delay, |
| base::TimeDelta fadeout_length); |
| |
| virtual ~ScrollbarAnimationControllerLinearFade(); |
| |
| // ScrollbarAnimationController overrides. |
| virtual bool IsScrollGestureInProgress() const OVERRIDE; |
| virtual bool IsAnimating() const OVERRIDE; |
| virtual base::TimeDelta DelayBeforeStart(base::TimeTicks now) const OVERRIDE; |
| |
| virtual bool Animate(base::TimeTicks now) OVERRIDE; |
| virtual void DidScrollGestureBegin() OVERRIDE; |
| virtual void DidScrollGestureEnd(base::TimeTicks now) OVERRIDE; |
| virtual void DidProgrammaticallyUpdateScroll(base::TimeTicks now) OVERRIDE; |
| |
| protected: |
| ScrollbarAnimationControllerLinearFade(LayerImpl* scroll_layer, |
| base::TimeDelta fadeout_delay, |
| base::TimeDelta fadeout_length); |
| |
| private: |
| float OpacityAtTime(base::TimeTicks now); |
| |
| LayerImpl* scroll_layer_; |
| |
| base::TimeTicks last_awaken_time_; |
| bool scroll_gesture_in_progress_; |
| |
| base::TimeDelta fadeout_delay_; |
| base::TimeDelta fadeout_length_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScrollbarAnimationControllerLinearFade); |
| }; |
| |
| } // namespace cc |
| |
| #endif // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_ |