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.
5 #ifndef ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_
6 #define ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_
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"
17 class RootWindowController;
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 {
27 explicit DesktopBackgroundWidgetController(views::Widget* widget);
29 virtual ~DesktopBackgroundWidgetController();
31 // Overridden from views::WidgetObserver.
32 virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
34 // Set bounds of component that draws background.
35 void SetBounds(gfx::Rect bounds);
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::RootWindow* root_window,
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);
49 views::Widget* widget() { return widget_; }
52 views::Widget* widget_;
54 DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundWidgetController);
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 {
63 explicit AnimatingDesktopController(
64 DesktopBackgroundWidgetController* component);
65 ~AnimatingDesktopController();
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
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);
87 scoped_ptr<DesktopBackgroundWidgetController> controller_;
89 DISALLOW_COPY_AND_ASSIGN(AnimatingDesktopController);
92 } // namespace internal
95 #endif // ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_