| // Copyright (c) 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 ASH_WM_WORKSPACE_DESKTOP_BACKGROUND_FADE_CONTROLLER_H_ |
| #define ASH_WM_WORKSPACE_DESKTOP_BACKGROUND_FADE_CONTROLLER_H_ |
| |
| #include "ash/ash_export.h" |
| #include "base/basictypes.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "ui/compositor/layer_animation_observer.h" |
| |
| namespace aura { |
| class Window; |
| } |
| |
| namespace base { |
| class TimeDelta; |
| } |
| |
| namespace ash { |
| namespace internal { |
| |
| class ColoredWindowController; |
| |
| // DesktopBackgroundFadeController handles fading in or out the desktop. It is |
| // used when maximizing or restoring a window. It is implemented as a colored |
| // layer whose opacity varies. This results in fading in or out all the windows |
| // the DesktopBackgroundFadeController is placed on top of. This is used |
| // instead of varying the opacity for two reasons: |
| // . The window showing background and the desktop workspace do not have a |
| // common parent that can be animated. This could be fixed, but wouldn't |
| // address the following. |
| // . When restoring the window is moved back to the desktop workspace. If we |
| // animated the opacity of the desktop workspace the cross fade would be |
| // effected. |
| class ASH_EXPORT DesktopBackgroundFadeController |
| : public ui::ImplicitAnimationObserver { |
| public: |
| // Direction to fade. |
| enum Direction { |
| FADE_IN, |
| FADE_OUT, |
| }; |
| |
| // Creates a new DesktopBackgroundFadeController. |parent| is the Window to |
| // parent the newly created window to. The newly created window is stacked |
| // directly on top of |position_above|. The window animating the fade is |
| // destroyed as soon as the animation completes. |
| DesktopBackgroundFadeController(aura::Window* parent, |
| aura::Window* position_above, |
| base::TimeDelta duration, |
| Direction direction); |
| virtual ~DesktopBackgroundFadeController(); |
| |
| private: |
| // ImplicitAnimationObserver overrides: |
| virtual void OnImplicitAnimationsCompleted() OVERRIDE; |
| |
| scoped_ptr<ColoredWindowController> window_controller_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundFadeController); |
| }; |
| |
| } // namespace internal |
| } // namespace ash |
| |
| #endif // ASH_WM_WORKSPACE_DESKTOP_BACKGROUND_FADE_CONTROLLER_H_ |