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      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_WM_SYSTEM_BACKGROUND_CONTROLLER_H_
      6 #define ASH_WM_SYSTEM_BACKGROUND_CONTROLLER_H_
      7 
      8 #include <string>
      9 
     10 #include "ash/ash_export.h"
     11 #include "base/basictypes.h"
     12 #include "base/memory/scoped_ptr.h"
     13 #include "third_party/skia/include/core/SkColor.h"
     14 #include "ui/aura/window_observer.h"
     15 
     16 namespace ui {
     17 class Layer;
     18 }
     19 
     20 namespace ash {
     21 namespace internal {
     22 
     23 // SystemBackgroundController manages a ui::Layer that's stacked at the bottom
     24 // of an aura::RootWindow's children.  It exists solely to obscure portions of
     25 // the root layer that aren't covered by any other layers (e.g. before the
     26 // desktop background image is loaded at startup, or when we scale down all of
     27 // the other layers as part of a power-button or window-management animation).
     28 // It should never be transformed or restacked.
     29 class SystemBackgroundController : public aura::WindowObserver {
     30  public:
     31   SystemBackgroundController(aura::Window* root_window, SkColor color);
     32   virtual ~SystemBackgroundController();
     33 
     34   void SetColor(SkColor color);
     35 
     36   // aura::WindowObserver overrides:
     37   virtual void OnWindowBoundsChanged(aura::Window* root,
     38                                      const gfx::Rect& old_bounds,
     39                                      const gfx::Rect& new_bounds) OVERRIDE;
     40 
     41  private:
     42   class HostContentLayerDelegate;
     43 
     44   aura::Window* root_window_;  // not owned
     45 
     46   scoped_ptr<ui::Layer> layer_;
     47 
     48   DISALLOW_COPY_AND_ASSIGN(SystemBackgroundController);
     49 };
     50 
     51 }  // namespace internal
     52 }  // namespace ash
     53 
     54 #endif  // ASH_WM_SYSTEM_BACKGROUND_CONTROLLER_H_
     55