Delegate mode information to a dedicated object

Rather than accessing global.session_type / global.session_mode
all over the place, delegate mode information to a dedicated
sessionMode object. While not very useful for now, we will replace
checks for a particular mode with checks for particular properties
that sessionMode defines based on global.session_mode.

https://bugzilla.gnome.org/show_bug.cgi?id=676156

js/Makefile.am

@@ -67,6 +67,7 @@ nobase_dist_js_DATA = 	\
 	ui/messageTray.js	\
 	ui/modalDialog.js	\
 	ui/networkAgent.js	\
+	ui/sessionMode.js	\
 	ui/shellEntry.js	\
 	ui/shellMountOperation.js \
 	ui/notificationDaemon.js \

js/ui/main.js

@@ -30,6 +30,7 @@ const NetworkAgent = imports.ui.networkAgent;
 const NotificationDaemon = imports.ui.notificationDaemon;
 const WindowAttentionHandler = imports.ui.windowAttentionHandler;
 const Scripting = imports.ui.scripting;
+const SessionMode = imports.ui.sessionMode;
 const ShellDBus = imports.ui.shellDBus;
 const TelepathyClient = imports.ui.telepathyClient;
 const WindowManager = imports.ui.windowManager;
@@ -56,6 +57,7 @@ let windowAttentionHandler = null;
 let telepathyClient = null;
 let ctrlAltTabManager = null;
 let recorder = null;
+let sessionMode = null;
 let shellDBusService = null;
 let modalCount = 0;
 let modalActorFocusStack = [];
@@ -159,6 +161,7 @@ function start() {
 
     Gio.DesktopAppInfo.set_desktop_env('GNOME');
 
+    sessionMode = new SessionMode.SessionMode();
     shellDBusService = new ShellDBus.GnomeShell();
 
     // Ensure ShellWindowTracker and ShellAppUsage are initialized; this will
@@ -210,7 +213,7 @@ function start() {
     xdndHandler = new XdndHandler.XdndHandler();
     ctrlAltTabManager = new CtrlAltTab.CtrlAltTabManager();
     // This overview object is just a stub for non-user sessions
-    overview = new Overview.Overview({ isDummy: global.session_type != Shell.SessionType.USER });
+    overview = new Overview.Overview({ isDummy: sessionMode.sessionType != Shell.SessionType.USER });
     magnifier = new Magnifier.Magnifier();
     statusIconDispatcher = new StatusIconDispatcher.StatusIconDispatcher();
     panel = new Panel.Panel();
@@ -220,9 +223,9 @@ function start() {
     notificationDaemon = new NotificationDaemon.NotificationDaemon();
     windowAttentionHandler = new WindowAttentionHandler.WindowAttentionHandler();
 
-    if (global.session_type == Shell.SessionType.USER)
+    if (sessionMode.sessionType == Shell.SessionType.USER)
         _createUserSession();
-    else if (global.session_type == Shell.SessionType.GDM)
+    else if (sessionMode.sessionType == Shell.SessionType.GDM)
         _createGDMSession();
 
     panel.startStatusArea();
@@ -231,7 +234,7 @@ function start() {
     keyboard.init();
     overview.init();
 
-    if (global.session_type == Shell.SessionType.USER)
+    if (sessionMode.sessionType == Shell.SessionType.USER)
         _initUserSession();
     statusIconDispatcher.start(messageTray.actor);
 
@@ -491,7 +494,7 @@ function loadTheme() {
 
     let theme = new St.Theme ({ application_stylesheet: cssStylesheet });
 
-    if (global.session_type == Shell.SessionType.GDM)
+    if (sessionMode.sessionType == Shell.SessionType.GDM)
         theme.load_stylesheet(_gdmCssStylesheet);
 
     if (previousTheme) {
@@ -566,7 +569,7 @@ function _globalKeyPressHandler(actor, event) {
 
     // Other bindings are only available to the user session when the overview is up and
     // no modal dialog is present.
-    if (global.session_type == Shell.SessionType.USER && (!overview.visible || modalCount > 1))
+    if (sessionMode.sessionType == Shell.SessionType.USER && (!overview.visible || modalCount > 1))
         return false;
 
     // This isn't a Meta.KeyBindingAction yet
@@ -582,7 +585,7 @@ function _globalKeyPressHandler(actor, event) {
     }
 
     // None of the other bindings are relevant outside of the user's session
-    if (global.session_type != Shell.SessionType.USER)
+    if (sessionMode.sessionType != Shell.SessionType.USER)
         return false;
 
     switch (action) {

js/ui/panel.js

@@ -962,7 +962,7 @@ const Panel = new Lang.Class({
         this.actor.connect('button-press-event', Lang.bind(this, this._onButtonPress));
 
         /* Button on the left side of the panel. */
-        if (global.session_type == Shell.SessionType.USER) {
+        if (Main.sessionMode.sessionType == Shell.SessionType.USER) {
             this._activitiesButton = new ActivitiesButton();
             this._activities = this._activitiesButton.actor;
             this._leftBox.add(this._activities);
@@ -976,7 +976,7 @@ const Panel = new Lang.Class({
         }
 
         /* center */
-        if (global.session_type == Shell.SessionType.USER)
+        if (Main.sessionMode.sessionType == Shell.SessionType.USER)
             this._dateMenu = new DateMenu.DateMenuButton({ showEvents: true });
         else
             this._dateMenu = new DateMenu.DateMenuButton({ showEvents: false });
@@ -984,7 +984,7 @@ const Panel = new Lang.Class({
         this._menus.addMenu(this._dateMenu.menu);
 
         /* right */
-        if (global.session_type == Shell.SessionType.GDM) {
+        if (Main.sessionMode.sessionType == Shell.SessionType.GDM) {
             this._status_area_order = GDM_STATUS_AREA_ORDER;
             this._status_area_shell_implementation = GDM_STATUS_AREA_SHELL_IMPLEMENTATION;
         } else {

js/ui/popupMenu.js

@@ -889,7 +889,7 @@ const PopupMenuBase = new Lang.Class({
 
     addSettingsAction: function(title, desktopFile) {
         // Don't allow user settings to get edited unless we're in a user session
-        if (global.session_type != Shell.SessionType.USER)
+        if (Main.sessionMode.sessionType != Shell.SessionType.USER)
             return null;
 
         let menuItem = this.addAction(title, function() {

js/ui/sessionMode.js

@@ -0,0 +1,25 @@
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+
+const Lang = imports.lang;
+const Shell = imports.gi.Shell;
+
+const Params = imports.misc.params;
+
+const DEFAULT_MODE = 'user';
+
+const _modes = {
+    'gdm': { sessionType: Shell.SessionType.GDM },
+
+    'user': { sessionType: Shell.SessionType.USER }
+};
+
+const SessionMode = new Lang.Class({
+    Name: 'SessionMode',
+
+    _init: function() {
+        let params = _modes[global.session_mode];
+
+        params = Params.parse(params, _modes[DEFAULT_MODE]);
+        Lang.copyProperties(params, this);
+    }
+});

js/ui/status/keyboard.js

@@ -63,7 +63,7 @@ const XKBIndicator = new Lang.Class({
 
         this._syncConfig();
 
-        if (global.session_type == Shell.SessionType.USER) {
+        if (Main.sessionMode.sessionType == Shell.SessionType.USER) {
             this.menu.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());
             this.menu.addAction(_("Show Keyboard Layout"), Lang.bind(this, function() {
                 Main.overview.hide();