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