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// 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_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_
#define ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_
#include "ash/ash_export.h"
#include "base/memory/scoped_ptr.h"
#include "ui/aura/window.h"
#include "ui/compositor/layer.h"
#include "ui/views/widget/widget.h"
#include "ui/views/widget/widget_observer.h"
namespace ash {
namespace internal {
class RootWindowController;
// This class implements a widget-based wallpaper.
// DesktopBackgroundWidgetController is owned by RootWindowController.
// When the animation completes the old DesktopBackgroundWidgetController is
// destroyed. Exported for tests.
class ASH_EXPORT DesktopBackgroundWidgetController
: public views::WidgetObserver {
public:
// Create
explicit DesktopBackgroundWidgetController(views::Widget* widget);
virtual ~DesktopBackgroundWidgetController();
// Overridden from views::WidgetObserver.
virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
// Set bounds of component that draws background.
void SetBounds(gfx::Rect bounds);
// Move component from |src_container| in |root_window| to |dest_container|.
// It is required for lock screen, when we need to move background so that
// it hides user's windows. Returns true if there was something to reparent.
bool Reparent(aura::Window* root_window,
int src_container,
int dest_container);
// Starts wallpaper fade in animation. |root_window_controller| is
// the root window where the animation will happen. (This is
// necessary this as |layer_| doesn't have access to the root window).
void StartAnimating(RootWindowController* root_window_controller);
views::Widget* widget() { return widget_; }
private:
views::Widget* widget_;
DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundWidgetController);
};
// This class wraps a DesktopBackgroundWidgetController pointer. It is owned
// by RootWindowController. The instance of DesktopBackgroundWidgetController is
// moved to this RootWindowController when the animation completes.
// Exported for tests.
class ASH_EXPORT AnimatingDesktopController {
public:
explicit AnimatingDesktopController(
DesktopBackgroundWidgetController* component);
~AnimatingDesktopController();
// Stops animation and makes sure OnImplicitAnimationsCompleted() is called if
// current animation is not finished yet.
// Note we have to make sure this function is called before we set
// kAnimatingDesktopController to a new controller. If it is not called, the
// animating widget/layer is closed immediately and the new one is animating
// from the widget/layer before animation. For instance, if a user quickly
// switches between red, green and blue wallpapers. The green wallpaper will
// first fade in from red wallpaper. And in the middle of the animation, blue
// wallpaper also wants to fade in. If the green wallpaper animation does not
// finish immediately, the green wallpaper widget will be removed and the red
// widget will show again. As a result, the blue wallpaper fades in from red
// wallpaper. This is a bad user experience. See bug http://crbug.com/156542
// for more details.
void StopAnimating();
// Gets the wrapped DesktopBackgroundWidgetController pointer. Caller should
// take ownership of the pointer if |pass_ownership| is true.
DesktopBackgroundWidgetController* GetController(bool pass_ownership);
private:
scoped_ptr<DesktopBackgroundWidgetController> controller_;
DISALLOW_COPY_AND_ASSIGN(AnimatingDesktopController);
};
} // namespace internal
} // namespace ash
#endif // ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_
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