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_H_ 6#define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_ 7 8#include "base/cancelable_callback.h" 9#include "base/memory/weak_ptr.h" 10#include "base/time/time.h" 11#include "cc/base/cc_export.h" 12#include "ui/gfx/vector2d_f.h" 13 14namespace cc { 15 16class CC_EXPORT ScrollbarAnimationControllerClient { 17 public: 18 virtual ~ScrollbarAnimationControllerClient() {} 19 20 virtual void PostDelayedScrollbarFade(const base::Closure& start_fade, 21 base::TimeDelta delay) = 0; 22 virtual void SetNeedsScrollbarAnimationFrame() = 0; 23}; 24 25// This abstract class represents the compositor-side analogy of 26// ScrollbarAnimator. Individual platforms should subclass it to provide 27// specialized implementation. 28class CC_EXPORT ScrollbarAnimationController { 29 public: 30 virtual ~ScrollbarAnimationController(); 31 32 void Animate(base::TimeTicks now); 33 34 virtual void DidScrollBegin(); 35 virtual void DidScrollUpdate(); 36 virtual void DidScrollEnd(); 37 virtual void DidMouseMoveOffScrollbar() {} 38 virtual void DidMouseMoveNear(float distance) {} 39 40 protected: 41 ScrollbarAnimationController(ScrollbarAnimationControllerClient* client, 42 base::TimeDelta delay_before_starting, 43 base::TimeDelta duration); 44 45 virtual void RunAnimationFrame(float progress) = 0; 46 47 void StartAnimation(); 48 void StopAnimation(); 49 50 private: 51 // Returns how far through the animation we are as a progress value from 52 // 0 to 1. 53 float AnimationProgressAtTime(base::TimeTicks now); 54 55 void PostDelayedFade(); 56 57 ScrollbarAnimationControllerClient* client_; 58 base::TimeTicks last_awaken_time_; 59 base::TimeDelta delay_before_starting_; 60 base::TimeDelta duration_; 61 bool is_animating_; 62 63 bool currently_scrolling_; 64 bool scroll_gesture_has_scrolled_; 65 base::CancelableClosure delayed_scrollbar_fade_; 66 67 base::WeakPtrFactory<ScrollbarAnimationController> weak_factory_; 68}; 69 70} // namespace cc 71 72#endif // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_ 73