Add LoginState class to src/chromeos/login

chromeos/login/login_state.h

+// Copyright (c) 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 CHROMEOS_LOGIN_LOGIN_STATE_H_
+#define CHROMEOS_LOGIN_LOGIN_STATE_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/observer_list.h"
+#include "chromeos/chromeos_export.h"
+
+namespace chromeos {
+
+// Tracks the login state of chrome, accessible to Ash and other chromeos code.
+class CHROMEOS_EXPORT LoginState {
+ public:
+  enum LoggedInState {
+    LOGGED_IN_OOBE,    // Out of box experience not completed
+    LOGGED_IN_NONE,    // Not logged in
+    LOGGED_IN_ACTIVE   // A user has logged in

[Nikita (slow), 2013/04/10 08:09:22]

I like that it is now called "active". In my multi-profiles change I'll be
replacing GetLoggedInUser() to GetActiveUser().

[stevenjb, 2013/04/10 16:32:17]

Good to hear. I struggled with the name for a bit; LOGGED_IN_LOGGED_IN seemed
pretty strange, and _COMPLETE seemed potentially misleading / confusing.

+  };
+
+  enum LoggedInUserType {
+    LOGGED_IN_USER_NONE,             // User is not logged in
+    LOGGED_IN_USER_REGULAR,          // A regular user is logged in
+    LOGGED_IN_USER_OWNER,            // The owner of the device is logged in
+    LOGGED_IN_USER_GUEST,            // A guest is logged in (i.e. incognito)
+    LOGGED_IN_USER_RETAIL_MODE,      // Is in retail mode
+    LOGGED_IN_USER_PUBLIC_ACCOUNT,   // A public account is logged in
+    LOGGED_IN_USER_LOCALLY_MANAGED,  // A locally managed user is logged in
+    LOGGED_IN_USER_KIOSK_APP         // Is in kiosk app mode
+  };
+
+  class Observer {
+   public:
+    // Called when the login state changes.
+    virtual void LoggedInStateChanged(LoggedInState state) = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  // Manage singleton instance.
+  static void Initialize();
+  static void Shutdown();
+  static LoginState* Get();
+  static bool IsInitialized();
+
+  // Add/remove observers.
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+  // Set the logged in state and user type.
+  void SetLoggedInState(LoggedInState state, LoggedInUserType type);
+
+  // Get the logged in state / user type.
+  LoggedInState GetLoggedInState() const;
+  LoggedInUserType GetLoggedInUserType() const;
+
+  // Returns true if |logged_in_state_| is active.
+  bool IsUserLoggedIn() const;
+
+ private:
+  LoginState();
+  virtual ~LoginState();
+
+  void NotifyObservers();
+
+  LoggedInState logged_in_state_;
+  LoggedInUserType logged_in_user_type_;
+  ObserverList<Observer> observer_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(LoginState);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_LOGIN_LOGIN_STATE_H_