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 base::TimeDelta fadeout_delay, 21 base::TimeDelta fadeout_length); 22 23 virtual ~ScrollbarAnimationControllerLinearFade(); 24 25 // ScrollbarAnimationController overrides. 26 virtual bool IsScrollGestureInProgress() const OVERRIDE; 27 virtual bool IsAnimating() const OVERRIDE; 28 virtual base::TimeDelta DelayBeforeStart(base::TimeTicks now) const OVERRIDE; 29 30 virtual bool Animate(base::TimeTicks now) OVERRIDE; 31 virtual void DidScrollGestureBegin() OVERRIDE; 32 virtual void DidScrollGestureEnd(base::TimeTicks now) OVERRIDE; 33 virtual void DidProgrammaticallyUpdateScroll(base::TimeTicks now) OVERRIDE; 34 35 protected: 36 ScrollbarAnimationControllerLinearFade(LayerImpl* scroll_layer, 37 base::TimeDelta fadeout_delay, 38 base::TimeDelta fadeout_length); 39 40 private: 41 float OpacityAtTime(base::TimeTicks now); 42 43 LayerImpl* scroll_layer_; 44 45 base::TimeTicks last_awaken_time_; 46 bool scroll_gesture_in_progress_; 47 48 base::TimeDelta fadeout_delay_; 49 base::TimeDelta fadeout_length_; 50 51 DISALLOW_COPY_AND_ASSIGN(ScrollbarAnimationControllerLinearFade); 52 }; 53 54 } // namespace cc 55 56 #endif // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_ 57
