Add LoginState class to src/chromeos/login

chromeos/login/login_state.cc

+// 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.
+
+#include "chromeos/login/login_state.h"
+
+#include "chromeos/dbus/dbus_thread_manager.h"
+
+namespace chromeos {
+
+static LoginState* g_login_state = NULL;
+
+// static
+void LoginState::Initialize() {
+  CHECK(!g_login_state);

[bartfab (slow), 2013/04/03 08:21:36]

#include "base/logging.h"

[stevenjb, 2013/04/03 17:21:42]

Done.

+  g_login_state = new LoginState();
+}
+
+// static
+void LoginState::Shutdown() {
+  CHECK(g_login_state);
+  delete g_login_state;
+  g_login_state = NULL;
+}
+
+// static
+LoginState* LoginState::Get() {
+  CHECK(g_login_state) << "LoginState::Get() called before Initialize()";
+  return g_login_state;
+}
+
+void LoginState::AddObserver(Observer* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void LoginState::RemoveObserver(Observer* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
+void LoginState::SetLoginState(LoginState::State state) {
+  if (state == state_)
+    return;
+  VLOG(1) << "Login State: " << state;
+  state_ = state;
+  NotifyObservers();
+}
+
+LoginState::State LoginState::GetLoginState() const {
+  if (screen_locked_)
+    return LOGGED_IN_LOCKED;
+  return state_;
+}
+
+bool LoginState::IsLoggedIn() {
+  if (state_ == LOGGED_IN_OOBE ||
+      state_ == LOGGED_IN_NONE) {
+    return false;
+  }
+  return true;
+}
+
+// Private methods
+
+LoginState::LoginState() : state_(LOGGED_IN_OOBE),
+                           screen_locked_(false) {
+  DBusThreadManager::Get()->GetSessionManagerClient()->AddObserver(this);
+}
+
+LoginState::~LoginState() {
+  DBusThreadManager::Get()->GetSessionManagerClient()->RemoveObserver(this);
+}
+
+void LoginState::LockScreen() {
+  screen_locked_ = true;
+  NotifyObservers();
+}
+
+void LoginState::UnlockScreen() {
+  screen_locked_ = false;
+  NotifyObservers();
+}
+
+void LoginState::NotifyObservers() {
+  FOR_EACH_OBSERVER(LoginState::Observer, observer_list_,
+                    LoginStateChanged(GetLoginState()));
+}
+
+}  // namespace chromeos