ash/wm/boot_splash_screen.h

   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_BOOT_SPLASH_SCREEN_H_
   6 #define ASH_WM_BOOT_SPLASH_SCREEN_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/time.h"
  13
  14 namespace aura {
  15 class RootWindow;
  16 }
  17
  18 namespace ui {
  19 class Layer;
  20 class LayerDelegate;
  21 }
  22
  23 namespace ash {
  24 namespace internal {
  25
  26 // BootSplashScreen manages a ui::Layer, stacked at the top of the root layer's
  27 // children, that displays a copy of the initial contents of the host window.
  28 // This allows us to continue displaying the Chrome OS boot splash screen (which
  29 // is displayed before Ash starts) after the compositor has taken over so we can
  30 // animate the transition between the splash screen and the login screen.
  31 class BootSplashScreen {
  32  public:
  33   explicit BootSplashScreen(aura::RootWindow* root_window);
  34   ~BootSplashScreen();
  35
  36   // Begins animating |layer_|'s opacity to 0 over |duration|.
  37   void StartHideAnimation(base::TimeDelta duration);
  38
  39  private:
  40   class CopyHostContentLayerDelegate;
  41
  42   // Copies the host window's content to |layer_|.
  43   scoped_ptr<CopyHostContentLayerDelegate> layer_delegate_;
  44
  45   scoped_ptr<ui::Layer> layer_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(BootSplashScreen);
  48 };
  49
  50 }  // namespace internal
  51 }  // namespace ash
  52
  53 #endif  // ASH_WM_BOOT_SPLASH_SCREEN_H_