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 namespace internal { 17 class RootWindowController; 18 19 // This class implements a widget-based wallpaper. 20 // DesktopBackgroundWidgetController is owned by RootWindowController. 21 // When the animation completes the old DesktopBackgroundWidgetController is 22 // destroyed. Exported for tests. 23 class ASH_EXPORT DesktopBackgroundWidgetController 24 : public views::WidgetObserver { 25 public: 26 // Create 27 explicit DesktopBackgroundWidgetController(views::Widget* widget); 28 29 virtual ~DesktopBackgroundWidgetController(); 30 31 // Overridden from views::WidgetObserver. 32 virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE; 33 34 // Set bounds of component that draws background. 35 void SetBounds(gfx::Rect bounds); 36 37 // Move component from |src_container| in |root_window| to |dest_container|. 38 // It is required for lock screen, when we need to move background so that 39 // it hides user's windows. Returns true if there was something to reparent. 40 bool Reparent(aura::Window* root_window, 41 int src_container, 42 int dest_container); 43 44 // Starts wallpaper fade in animation. |root_window_controller| is 45 // the root window where the animation will happen. (This is 46 // necessary this as |layer_| doesn't have access to the root window). 47 void StartAnimating(RootWindowController* root_window_controller); 48 49 views::Widget* widget() { return widget_; } 50 51 private: 52 views::Widget* widget_; 53 54 DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundWidgetController); 55 }; 56 57 // This class wraps a DesktopBackgroundWidgetController pointer. It is owned 58 // by RootWindowController. The instance of DesktopBackgroundWidgetController is 59 // moved to this RootWindowController when the animation completes. 60 // Exported for tests. 61 class ASH_EXPORT AnimatingDesktopController { 62 public: 63 explicit AnimatingDesktopController( 64 DesktopBackgroundWidgetController* component); 65 ~AnimatingDesktopController(); 66 67 // Stops animation and makes sure OnImplicitAnimationsCompleted() is called if 68 // current animation is not finished yet. 69 // Note we have to make sure this function is called before we set 70 // kAnimatingDesktopController to a new controller. If it is not called, the 71 // animating widget/layer is closed immediately and the new one is animating 72 // from the widget/layer before animation. For instance, if a user quickly 73 // switches between red, green and blue wallpapers. The green wallpaper will 74 // first fade in from red wallpaper. And in the middle of the animation, blue 75 // wallpaper also wants to fade in. If the green wallpaper animation does not 76 // finish immediately, the green wallpaper widget will be removed and the red 77 // widget will show again. As a result, the blue wallpaper fades in from red 78 // wallpaper. This is a bad user experience. See bug http://crbug.com/156542 79 // for more details. 80 void StopAnimating(); 81 82 // Gets the wrapped DesktopBackgroundWidgetController pointer. Caller should 83 // take ownership of the pointer if |pass_ownership| is true. 84 DesktopBackgroundWidgetController* GetController(bool pass_ownership); 85 86 private: 87 scoped_ptr<DesktopBackgroundWidgetController> controller_; 88 89 DISALLOW_COPY_AND_ASSIGN(AnimatingDesktopController); 90 }; 91 92 } // namespace internal 93 } // namespace ash 94 95 #endif // ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_ 96
