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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_WM_ROOT_WINDOW_LAYOUT_MANAGER_H_
#define ASH_WM_ROOT_WINDOW_LAYOUT_MANAGER_H_
#pragma once
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "ui/aura/layout_manager.h"
namespace aura {
class Window;
}
namespace gfx {
class Rect;
}
namespace ui {
class Layer;
}
namespace views {
class Widget;
}
namespace ash {
namespace internal {
// A layout manager for the root window.
// Resizes all of its immediate children to fill the bounds of the root window.
class RootWindowLayoutManager : public aura::LayoutManager {
public:
explicit RootWindowLayoutManager(aura::Window* owner);
virtual ~RootWindowLayoutManager();
views::Widget* background_widget() { return background_widget_; }
ui::Layer* background_layer() { return background_layer_.get(); }
// Sets the background to |widget|. Closes and destroys the old widget if it
// exists and differs from the new widget.
void SetBackgroundWidget(views::Widget* widget);
// Sets a background layer, taking ownership of |layer|. This is provided as
// a lightweight alternative to SetBackgroundWidget(); layers can be simple
// colored quads instead of being textured.
void SetBackgroundLayer(ui::Layer* layer);
// Overridden from aura::LayoutManager:
virtual void OnWindowResized() OVERRIDE;
virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE;
virtual void OnChildWindowVisibilityChanged(aura::Window* child,
bool visible) OVERRIDE;
virtual void SetChildBounds(aura::Window* child,
const gfx::Rect& requested_bounds) OVERRIDE;
private:
aura::Window* owner_;
// May be NULL if we're not painting a background.
views::Widget* background_widget_;
scoped_ptr<ui::Layer> background_layer_;
DISALLOW_COPY_AND_ASSIGN(RootWindowLayoutManager);
};
} // namespace internal
} // namespace ash
#endif // ASH_WM_ROOT_WINDOW_LAYOUT_MANAGER_H_
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