1 // Copyright (c) 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 ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_ 6 #define ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_ 7 8 #include "ash/ash_export.h" 9 #include "base/memory/scoped_ptr.h" 10 #include "ui/aura/window.h" 11 #include "ui/compositor/layer.h" 12 #include "ui/views/widget/widget.h" 13 #include "ui/views/widget/widget_observer.h" 14 15 namespace ash { 16 class RootWindowController; 17 18 // This class implements a widget-based wallpaper. 19 // DesktopBackgroundWidgetController is owned by RootWindowController. 20 // When the animation completes the old DesktopBackgroundWidgetController is 21 // destroyed. Exported for tests. 22 class ASH_EXPORT DesktopBackgroundWidgetController 23 : public views::WidgetObserver { 24 public: 25 // Create 26 explicit DesktopBackgroundWidgetController(views::Widget* widget); 27 28 virtual ~DesktopBackgroundWidgetController(); 29 30 // Overridden from views::WidgetObserver. 31 virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE; 32 33 // Set bounds of component that draws background. 34 void SetBounds(gfx::Rect bounds); 35 36 // Move component from |src_container| in |root_window| to |dest_container|. 37 // It is required for lock screen, when we need to move background so that 38 // it hides user's windows. Returns true if there was something to reparent. 39 bool Reparent(aura::Window* root_window, 40 int src_container, 41 int dest_container); 42 43 // Starts wallpaper fade in animation. |root_window_controller| is 44 // the root window where the animation will happen. (This is 45 // necessary this as |layer_| doesn't have access to the root window). 46 void StartAnimating(RootWindowController* root_window_controller); 47 48 views::Widget* widget() { return widget_; } 49 50 private: 51 views::Widget* widget_; 52 53 DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundWidgetController); 54 }; 55 56 // This class wraps a DesktopBackgroundWidgetController pointer. It is owned 57 // by RootWindowController. The instance of DesktopBackgroundWidgetController is 58 // moved to this RootWindowController when the animation completes. 59 // Exported for tests. 60 class ASH_EXPORT AnimatingDesktopController { 61 public: 62 explicit AnimatingDesktopController( 63 DesktopBackgroundWidgetController* component); 64 ~AnimatingDesktopController(); 65 66 // Stops animation and makes sure OnImplicitAnimationsCompleted() is called if 67 // current animation is not finished yet. 68 // Note we have to make sure this function is called before we set 69 // kAnimatingDesktopController to a new controller. If it is not called, the 70 // animating widget/layer is closed immediately and the new one is animating 71 // from the widget/layer before animation. For instance, if a user quickly 72 // switches between red, green and blue wallpapers. The green wallpaper will 73 // first fade in from red wallpaper. And in the middle of the animation, blue 74 // wallpaper also wants to fade in. If the green wallpaper animation does not 75 // finish immediately, the green wallpaper widget will be removed and the red 76 // widget will show again. As a result, the blue wallpaper fades in from red 77 // wallpaper. This is a bad user experience. See bug http://crbug.com/156542 78 // for more details. 79 void StopAnimating(); 80 81 // Gets the wrapped DesktopBackgroundWidgetController pointer. Caller should 82 // take ownership of the pointer if |pass_ownership| is true. 83 DesktopBackgroundWidgetController* GetController(bool pass_ownership); 84 85 private: 86 scoped_ptr<DesktopBackgroundWidgetController> controller_; 87 88 DISALLOW_COPY_AND_ASSIGN(AnimatingDesktopController); 89 }; 90 91 } // namespace ash 92 93 #endif // ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_ 94
