text: // Copyright 2014 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef APPS_SHELL_BROWSER_SHELL_DESKTOP_CONTROLLER_H_
  #define APPS_SHELL_BROWSER_SHELL_DESKTOP_CONTROLLER_H_
  
  #include "base/basictypes.h"
  #include "base/compiler_specific.h"
  #include "base/memory/scoped_ptr.h"
  #include "ui/aura/window_tree_host_observer.h"
  #include "ui/gfx/geometry/size.h"
  
  #if defined(OS_CHROMEOS) && defined(USE_X11)
  #include "ui/display/chromeos/output_configurator.h"
  #endif
  
  namespace aura {
  class TestScreen;
  class WindowTreeHost;
  }
  
  namespace wm {
  class WMTestHelper;
  }
  
  namespace apps {
  
  // Handles desktop-related tasks for app_shell.
  class ShellDesktopController
  #if defined(OS_CHROMEOS) && defined(USE_X11)
      : public ui::OutputConfigurator::Observer
  #endif
      {
   public:
    ShellDesktopController();
    virtual ~ShellDesktopController();
  
    // Returns the host for the Aura window tree.
    aura::WindowTreeHost* GetWindowTreeHost();
  
  #if defined(OS_CHROMEOS) && defined(USE_X11)
    // ui::OutputConfigurator::Observer overrides.
    virtual void OnDisplayModeChanged(
        const std::vector<ui::OutputConfigurator::DisplayState>& outputs)
        OVERRIDE;
  #endif
  
   private:
    // Creates the window that hosts the app.
    void CreateRootWindow();
  
    // Closes and destroys the root window hosting the app.
    void DestroyRootWindow();
  
    // Returns the dimensions (in pixels) of the primary display, or an empty size
    // if the dimensions can't be determined or no display is connected.
    gfx::Size GetPrimaryDisplaySize();
  
  #if defined(OS_CHROMEOS) && defined(USE_X11)
    scoped_ptr<ui::OutputConfigurator> output_configurator_;
  #endif
  
    // Enable a minimal set of views::corewm to be initialized.
    scoped_ptr<wm::WMTestHelper> wm_test_helper_;
  
    scoped_ptr<aura::TestScreen> test_screen_;
  
    DISALLOW_COPY_AND_ASSIGN(ShellDesktopController);
  };
  
  }  // namespace apps
  
  #endif  // APPS_SHELL_BROWSER_SHELL_DESKTOP_CONTROLLER_H_
  