text: // Copyright 2013 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 CHROME_BROWSER_UI_VIEWS_FRAME_GLOBAL_MENU_BAR_REGISTRAR_X11_H_
  #define CHROME_BROWSER_UI_VIEWS_FRAME_GLOBAL_MENU_BAR_REGISTRAR_X11_H_
  
  #include <map>
  #include <string>
  
  #include "base/macros.h"
  #include "base/memory/ref_counted.h"
  #include "base/memory/singleton.h"
  #include "base/memory/weak_ptr.h"
  
  namespace dbus {
  class Bus;
  class ObjectProxy;
  }  // namespace dbus
  
  class GlobalMenuBarX11;
  
  // Advertises our menu bars to com.canonical.AppMenu.Registrar.
  //
  // GlobalMenuBarRegistrarX11 is responsible for managing the dbus::Bus shared by
  // each menu. We need a separate object to own the dbus channel and to
  // register/unregister the mapping between a menu and the com.canonical.dbusmenu
  // instance we are offering.
  class GlobalMenuBarRegistrarX11 {
   public:
    static GlobalMenuBarRegistrarX11* GetInstance();
  
    void OnMenuBarCreated(GlobalMenuBarX11* menu);
    void OnMenuBarDestroyed(GlobalMenuBarX11* menu);
  
    dbus::Bus* bus() { return bus_.get(); }
  
   private:
    friend struct base::DefaultSingletonTraits<GlobalMenuBarRegistrarX11>;
  
    enum MenuState {
      // Initialize() hasn't been called.
      kUninitialized,
  
      // Initialize() has been called and we're waiting for an async result.
      kInitializing,
  
      // Initialize() failed, and the window will not be registered.
      kInitializeFailed,
  
      // Initialize() succeeded and we will register the window once the appmenu
      // registrar has an owner.
      kInitializeSucceeded,
  
      // Initialize() succeeded and RegisterMenu has been sent.
      kRegistered,
    };
  
    GlobalMenuBarRegistrarX11();
    ~GlobalMenuBarRegistrarX11();
  
    void InitializeMenu(GlobalMenuBarX11* menu);
  
    // Sends the actual message.
    void RegisterMenu(GlobalMenuBarX11* menu);
  
    void OnMenuInitialized(GlobalMenuBarX11* menu, bool success);
  
    void OnNameOwnerChanged(const std::string& service_owner);
  
    scoped_refptr<dbus::Bus> bus_;
    dbus::ObjectProxy* registrar_proxy_;
    bool service_has_owner_ = false;
  
    // Maps menus to flags that indicate if the menu has been successfully
    // initialized.
    std::map<GlobalMenuBarX11*, MenuState> menus_;
  
    base::WeakPtrFactory<GlobalMenuBarRegistrarX11> weak_ptr_factory_{this};
  
    DISALLOW_COPY_AND_ASSIGN(GlobalMenuBarRegistrarX11);
  };
  
  #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_GLOBAL_MENU_BAR_REGISTRAR_X11_H_
  