ash/wm/boot_splash_screen_chromeos.h

   1 // Copyright 2013 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_CHROMEOS_H_
   6 #define ASH_WM_BOOT_SPLASH_SCREEN_CHROMEOS_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/time/time.h"
  13
  14 namespace aura {
  15 class WindowTreeHost;
  16 }
  17
  18 namespace ui {
  19 class Layer;
  20 class LayerDelegate;
  21 }
  22
  23 namespace ash {
  24
  25 // BootSplashScreen manages a ui::Layer, stacked at the top of the root layer's
  26 // children, that displays a copy of the initial contents of the host window.
  27 // This allows us to continue displaying the Chrome OS boot splash screen (which
  28 // is displayed before Ash starts) after the compositor has taken over so we can
  29 // animate the transition between the splash screen and the login screen.
  30 class BootSplashScreen {
  31  public:
  32   explicit BootSplashScreen(aura::WindowTreeHost* host);
  33   ~BootSplashScreen();
  34
  35   // Begins animating |layer_|'s opacity to 0 over |duration|.
  36   void StartHideAnimation(base::TimeDelta duration);
  37
  38  private:
  39   class CopyHostContentLayerDelegate;
  40
  41   // Copies the host window's content to |layer_|.
  42   scoped_ptr<CopyHostContentLayerDelegate> layer_delegate_;
  43
  44   scoped_ptr<ui::Layer> layer_;
  45
  46   DISALLOW_COPY_AND_ASSIGN(BootSplashScreen);
  47 };
  48
  49 }  // namespace ash
  50
  51 #endif  // ASH_WM_BOOT_SPLASH_SCREEN_CHROMEOS_H_