| // Copyright (c) 2010 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 APP_ANIMATION_H_ |
| #define APP_ANIMATION_H_ |
| #pragma once |
| |
| #include "app/animation_container_element.h" |
| #include "base/ref_counted.h" |
| #include "base/time.h" |
| |
| namespace gfx { |
| class Rect; |
| } |
| |
| class AnimationContainer; |
| class AnimationDelegate; |
| |
| // Base class used in implementing animations. You only need use this class if |
| // you're implementing a new animation type, otherwise you'll likely want one of |
| // LinearAnimation, SlideAnimation, ThrobAnimation or MultiAnimation. |
| // |
| // To subclass override Step, which is invoked as the animation progresses and |
| // GetCurrentValue() to return the value appropriate to the animation. |
| class Animation : public AnimationContainerElement { |
| public: |
| explicit Animation(base::TimeDelta timer_interval); |
| virtual ~Animation(); |
| |
| // Starts the animation. Does nothing if the animation is already running. |
| void Start(); |
| |
| // Stops the animation. Does nothing if the animation is not running. |
| void Stop(); |
| |
| // Gets the value for the current state, according to the animation |
| // curve in use. |
| virtual double GetCurrentValue() const = 0; |
| |
| // Convenience for returning a value between |start| and |target| based on |
| // the current value. This is (target - start) * GetCurrentValue() + start. |
| double CurrentValueBetween(double start, double target) const; |
| int CurrentValueBetween(int start, int target) const; |
| gfx::Rect CurrentValueBetween(const gfx::Rect& start_bounds, |
| const gfx::Rect& target_bounds) const; |
| |
| // Sets the delegate. |
| void set_delegate(AnimationDelegate* delegate) { delegate_ = delegate; } |
| |
| // Sets the container used to manage the timer. A value of NULL results in |
| // creating a new AnimationContainer. |
| void SetContainer(AnimationContainer* container); |
| |
| bool is_animating() const { return is_animating_; } |
| |
| base::TimeDelta timer_interval() const { return timer_interval_; } |
| |
| // Returns true if rich animations should be rendered. |
| // Looks at session type (e.g. remote desktop) and accessibility settings |
| // to give guidance for heavy animations such as "start download" arrow. |
| static bool ShouldRenderRichAnimation(); |
| |
| protected: |
| // Invoked from Start to allow subclasses to prepare for the animation. |
| virtual void AnimationStarted() {} |
| |
| // Invoked from Stop after we're removed from the container but before the |
| // delegate has been invoked. |
| virtual void AnimationStopped() {} |
| |
| // Invoked from stop to determine if cancel should be invoked. If this returns |
| // true the delegate is notified the animation was canceled, otherwise the |
| // delegate is notified the animation stopped. |
| virtual bool ShouldSendCanceledFromStop() { return false; } |
| |
| AnimationContainer* container() { return container_.get(); } |
| base::TimeTicks start_time() const { return start_time_; } |
| AnimationDelegate* delegate() { return delegate_; } |
| |
| // AnimationContainer::Element overrides |
| virtual void SetStartTime(base::TimeTicks start_time); |
| virtual void Step(base::TimeTicks time_now) = 0; |
| virtual base::TimeDelta GetTimerInterval() const { return timer_interval_; } |
| |
| private: |
| // Interval for the animation. |
| const base::TimeDelta timer_interval_; |
| |
| // If true we're running. |
| bool is_animating_; |
| |
| // Our delegate; may be null. |
| AnimationDelegate* delegate_; |
| |
| // Container we're in. If non-null we're animating. |
| scoped_refptr<AnimationContainer> container_; |
| |
| // Time we started at. |
| base::TimeTicks start_time_; |
| |
| DISALLOW_COPY_AND_ASSIGN(Animation); |
| }; |
| |
| #endif // APP_ANIMATION_H_ |