Implement the auto-logout on idle feature for Kiosk mode.

chrome/browser/chromeos/kiosk_mode/kiosk_mode_idle_logout.cc

+// Copyright (c) 2012 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 "chrome/browser/chromeos/kiosk_mode/kiosk_mode_idle_logout.h"
+
+#include "base/bind.h"
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+#include "base/message_loop.h"
+#include "chrome/browser/chromeos/dbus/dbus_thread_manager.h"
+#include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_helper.h"
+#include "chrome/browser/chromeos/dbus/power_manager_client.h"
+#include "chrome/browser/ui/webui/chromeos/idle_logout_dialog.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/notification_service.h"
+
+namespace {
+
+const int64 kLoginIdleTimeout = 100; // seconds
+
+}  // namespace
+
+namespace browser {
+
+void ShowIdleLogoutDialog() {
+  IdleLogoutDialog::ShowIdleLogoutDialog();
+}
+
+void CloseIdleLogoutDialog() {
+  IdleLogoutDialog::CloseIdleLogoutDialog();
+}
+
+}  // namespace browser
+
+namespace chromeos {
+
+KioskModeIdleLogout::KioskModeIdleLogout() {
+  if (chromeos::KioskModeHelper::Get()->is_initialized())
+    Setup();
+  else
+    chromeos::KioskModeHelper::Get()->Initialize(
+        base::Bind(&KioskModeIdleLogout::Setup,
+                   base::Unretained(this)));
+}
+
+void KioskModeIdleLogout::Setup() {
+  registrar_.Add(this, chrome::NOTIFICATION_LOGIN_USER_CHANGED,
+                 content::NotificationService::AllSources());
+}
+
+void KioskModeIdleLogout::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  if (type == chrome::NOTIFICATION_LOGIN_USER_CHANGED) {
+    // Register our observers only when a user logs on.
+    chromeos::PowerManagerClient* power_manager =
+        chromeos::DBusThreadManager::Get()->GetPowerManagerClient();
+    if (!power_manager->HasObserver(this))
+      power_manager->AddObserver(this);
+
+    // Register for the next Idle for kLoginIdleTimeout event.
+    chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->
+        RequestIdleNotification(
+            chromeos::KioskModeHelper::Get()->GetIdleLogoutTimeout() * 1000);
+  }
+}
+
+void KioskModeIdleLogout::IdleNotify(int64 threshold) {
+  // We're idle, next time we go active, we need to know so we can remove
+  // the logout dialog if it's still up.
+  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->
+      RequestActiveNotification();
+
+  browser::ShowIdleLogoutDialog();
+}
+
+void KioskModeIdleLogout::ActiveNotify() {
+  // Before anything else, close the logout dialog to prevent restart
+  browser::CloseIdleLogoutDialog();
+
+  // Now that we're active, register a request for notification for
+  // the next time we go idle for kLoginIdleTimeout seconds.
+  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->
+      RequestIdleNotification(
+          chromeos::KioskModeHelper::Get()->GetIdleLogoutTimeout() * 1000);
+}
+
+static base::LazyInstance<KioskModeIdleLogout>
+    g_kiosk_mode_idle_logout = LAZY_INSTANCE_INITIALIZER;
+
+void InitializeKioskModeIdleLogout() {
+  g_kiosk_mode_idle_logout.Get();
+}
+
+}  // namespace chromeos