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