gdm: add a power button

Making users have to log in to power off the machine isn't a good idea.

This commit adds a power menu similar to the one in the fallback greeter
which offers 3 items:

- Suspend
- Restart
- Power off

https://bugzilla.gnome.org/show_bug.cgi?id=657822

js/Makefile.am

@@ -3,7 +3,9 @@ jsdir = $(pkgdatadir)/js
 
 nobase_dist_js_DATA = 	\
 	gdm/batch.js		\
+	gdm/consoleKit.js	\
 	gdm/loginDialog.js	\
+	gdm/powerMenu.js	\
 	misc/config.js		\
 	misc/docInfo.js		\
 	misc/fileUtils.js	\

js/gdm/consoleKit.js

@@ -0,0 +1,32 @@
+// -*- mode: js2; indent-tabs-mode: nil; js2-basic-offset: 4 -*-
+
+const DBus = imports.dbus;
+
+const ConsoleKitManagerIface = {
+    name: 'org.freedesktop.ConsoleKit.Manager',
+    methods: [{ name: 'CanRestart',
+                inSignature: '',
+                outSignature: 'b' },
+              { name: 'CanStop',
+                inSignature: '',
+                outSignature: 'b' },
+              { name: 'Restart',
+                inSignature: '',
+                outSignature: '' },
+              { name: 'Stop',
+                inSignature: '',
+                outSignature: '' }]
+};
+
+function ConsoleKitManager() {
+    this._init();
+};
+
+ConsoleKitManager.prototype = {
+    _init: function() {
+        DBus.system.proxifyObject(this,
+                                  'org.freedesktop.ConsoleKit',
+                                  '/org/freedesktop/ConsoleKit/Manager');
+    }
+};
+DBus.proxifyPrototype(ConsoleKitManager.prototype, ConsoleKitManagerIface);

js/gdm/powerMenu.js

@@ -0,0 +1,146 @@
+/* -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*-
+ *
+ * Copyright 2011 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+const Lang = imports.lang;
+const UPowerGlib = imports.gi.UPowerGlib;
+
+const ConsoleKit = imports.gdm.consoleKit;
+const PanelMenu = imports.ui.panelMenu;
+const PopupMenu = imports.ui.popupMenu;
+
+function PowerMenuButton() {
+    this._init();
+}
+
+PowerMenuButton.prototype = {
+    __proto__: PanelMenu.SystemStatusButton.prototype,
+
+    _init: function() {
+        PanelMenu.SystemStatusButton.prototype._init.call(this, 'system-shutdown', null);
+        this._consoleKitManager = new ConsoleKit.ConsoleKitManager();
+        this._upClient = new UPowerGlib.Client();
+
+        this._createSubMenu();
+
+        this._upClient.connect('notify::can-suspend',
+                               Lang.bind(this, this._updateHaveSuspend));
+        this._updateHaveSuspend();
+
+        // ConsoleKit doesn't send notifications when shutdown/reboot
+        // are disabled, so we update the menu item each time the menu opens
+        this.menu.connect('open-state-changed', Lang.bind(this,
+            function(menu, open) {
+                if (open) {
+                    this._updateHaveShutdown();
+                    this._updateHaveRestart();
+                }
+            }));
+        this._updateHaveShutdown();
+        this._updateHaveRestart();
+    },
+
+    _updateVisibility: function() {
+        if (!this._haveSuspend && !this._haveShutdown && !this._haveRestart)
+            this.actor.hide();
+        else
+            this.actor.show();
+    },
+
+    _updateHaveShutdown: function() {
+        this._consoleKitManager.CanStopRemote(Lang.bind(this,
+            function(result, error) {
+                if (!error)
+                    this._haveShutdown = result;
+                else
+                    this._haveShutdown = false;
+
+                if (this._haveShutdown) {
+                    this._powerOffItem.actor.show();
+                } else {
+                    this._powerOffItem.actor.hide();
+                }
+
+                this._updateVisibility();
+            }));
+    },
+
+    _updateHaveRestart: function() {
+        this._consoleKitManager.CanRestartRemote(Lang.bind(this,
+            function(result, error) {
+                if (!error)
+                    this._haveRestart = result;
+                else
+                    this._haveRestart = false;
+
+                if (this._haveRestart) {
+                    this._restartItem.actor.show();
+                } else {
+                    this._restartItem.actor.hide();
+                }
+
+                this._updateVisibility();
+            }));
+    },
+
+    _updateHaveSuspend: function() {
+        this._haveSuspend = this._upClient.get_can_suspend();
+
+        if (this._haveSuspend)
+            this._suspendItem.actor.show();
+        else
+            this._suspendItem.actor.hide();
+
+        this._updateVisibility();
+    },
+
+    _createSubMenu: function() {
+        let item;
+
+        item = new PopupMenu.PopupMenuItem(_("Suspend"));
+        item.connect('activate', Lang.bind(this, this._onActivateSuspend));
+        this.menu.addMenuItem(item);
+        this._suspendItem = item;
+
+        item = new PopupMenu.PopupMenuItem(_("Restart"));
+        item.connect('activate', Lang.bind(this, this._onActivateRestart));
+        this.menu.addMenuItem(item);
+        this._restartItem = item;
+
+        item = new PopupMenu.PopupMenuItem(_("Power Off"));
+        item.connect('activate', Lang.bind(this, this._onActivatePowerOff));
+        this.menu.addMenuItem(item);
+        this._powerOffItem = item;
+    },
+
+    _onActivateSuspend: function() {
+        if (this._haveSuspend)
+            this._upClient.suspend_sync(null);
+    },
+
+    _onActivateRestart: function() {
+        if (this._haveRestart)
+            this._consoleKitManager.RestartRemote();
+    },
+
+    _onActivatePowerOff: function() {
+        if (this._haveShutdown)
+            this._consoleKitManager.StopRemote();
+    }
+};

js/ui/panel.js

@@ -45,12 +45,13 @@ try {
     log('NMApplet is not supported. It is possible that your NetworkManager version is too old');
 }
 
-const GDM_STATUS_AREA_ORDER = ['a11y', 'display', 'keyboard', 'volume', 'battery'];
+const GDM_STATUS_AREA_ORDER = ['a11y', 'display', 'keyboard', 'volume', 'battery', 'powerMenu'];
 const GDM_STATUS_AREA_SHELL_IMPLEMENTATION = {
     'a11y': imports.ui.status.accessibility.ATIndicator,
     'volume': imports.ui.status.volume.Indicator,
     'battery': imports.ui.status.power.Indicator,
-    'keyboard': imports.ui.status.keyboard.XKBIndicator
+    'keyboard': imports.ui.status.keyboard.XKBIndicator,
+    'powerMenu': imports.gdm.powerMenu.PowerMenuButton
 };
 
 // To make sure the panel corners blend nicely with the panel,