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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_SYSTEM_BACKGROUND_CONTROLLER_H_
#define ASH_WM_SYSTEM_BACKGROUND_CONTROLLER_H_
#include <string>
#include "ash/ash_export.h"
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/aura/window_observer.h"
namespace ui {
class Layer;
}
namespace ash {
// SystemBackgroundController manages a ui::Layer that's stacked at the bottom
// of an aura::RootWindow's children. It exists solely to obscure portions of
// the root layer that aren't covered by any other layers (e.g. before the
// desktop background image is loaded at startup, or when we scale down all of
// the other layers as part of a power-button or window-management animation).
// It should never be transformed or restacked.
class SystemBackgroundController : public aura::WindowObserver {
public:
SystemBackgroundController(aura::Window* root_window, SkColor color);
virtual ~SystemBackgroundController();
void SetColor(SkColor color);
// aura::WindowObserver overrides:
virtual void OnWindowBoundsChanged(aura::Window* root,
const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds) override;
private:
class HostContentLayerDelegate;
aura::Window* root_window_; // not owned
scoped_ptr<ui::Layer> layer_;
DISALLOW_COPY_AND_ASSIGN(SystemBackgroundController);
};
} // namespace ash
#endif // ASH_WM_SYSTEM_BACKGROUND_CONTROLLER_H_
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