| // Copyright 2013 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_THINNING_H_ |
| #define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_ |
| |
| #include "base/memory/scoped_ptr.h" |
| #include "cc/animation/scrollbar_animation_controller.h" |
| #include "cc/base/cc_export.h" |
| |
| namespace cc { |
| class LayerImpl; |
| |
| // Scrollbar animation that partially fades and thins after an idle delay. |
| class CC_EXPORT ScrollbarAnimationControllerThinning |
| : public ScrollbarAnimationController { |
| public: |
| static scoped_ptr<ScrollbarAnimationControllerThinning> Create( |
| LayerImpl* scroll_layer); |
| |
| static scoped_ptr<ScrollbarAnimationControllerThinning> CreateForTest( |
| LayerImpl* scroll_layer, |
| base::TimeDelta animation_delay, |
| base::TimeDelta animation_duration); |
| |
| virtual ~ScrollbarAnimationControllerThinning(); |
| |
| // ScrollbarAnimationController overrides. |
| 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 bool DidScrollUpdate(base::TimeTicks now) OVERRIDE; |
| |
| protected: |
| ScrollbarAnimationControllerThinning(LayerImpl* scroll_layer, |
| base::TimeDelta animation_delay, |
| base::TimeDelta animation_duration); |
| |
| private: |
| // Returns how far through the animation we are as a progress value from |
| // 0 to 1. |
| float AnimationProgressAtTime(base::TimeTicks now); |
| float OpacityAtAnimationProgress(float progress); |
| float ThumbThicknessScaleAtAnimationProgress(float progress); |
| void ApplyOpacityAndThumbThicknessScale(float opacity, |
| float thumb_thickness_scale); |
| |
| LayerImpl* scroll_layer_; |
| |
| base::TimeTicks last_awaken_time_; |
| bool scroll_gesture_in_progress_; |
| |
| base::TimeDelta animation_delay_; |
| base::TimeDelta animation_duration_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScrollbarAnimationControllerThinning); |
| }; |
| |
| } // namespace cc |
| |
| #endif // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_ |