Calendar: only show events when configured in Evolution

When no calendars are enabled, hide the events pane completely instead
of showing it empty.

https://bugzilla.gnome.org/show_bug.cgi?id=680083

js/ui/calendar.js

@@ -170,6 +170,7 @@ const EmptyEventSource = new Lang.Class({
     _init: function() {
         this.isLoading = false;
         this.isDummy = true;
+        this.hasCalendars = false;
     },
 
     destroy: function() {
@@ -196,6 +197,7 @@ const CalendarServerIface = <interface name="org.gnome.Shell.CalendarServer">
     <arg type="b" direction="in" />
     <arg type="a(sssbxxa{sv})" direction="out" />
 </method>
+<property name="HasCalendars" type="b" access="read" />
 <signal name="Changed" />
 </interface>;
 
@@ -206,8 +208,7 @@ function CalendarServer() {
                                g_interface_name: CalendarServerInfo.name,
                                g_interface_info: CalendarServerInfo,
                                g_name: 'org.gnome.Shell.CalendarServer',
-                               g_object_path: '/org/gnome/Shell/CalendarServer',
-                               g_flags: Gio.DBusProxyFlags.DO_NOT_LOAD_PROPERTIES });
+                               g_object_path: '/org/gnome/Shell/CalendarServer' });
 }
 
 function _datesEqual(a, b) {
@@ -256,7 +257,12 @@ const DBusEventSource = new Lang.Class({
                     this._onNameVanished();
             }));
 
+            this._dbusProxy.connect('g-properties-changed', Lang.bind(this, function() {
+                this.emit('notify::has-calendars');
+            }));
+
             this._initialized = true;
+            this.emit('notify::has-calendars');
             this._onNameAppeared();
         }));
     },
@@ -265,6 +271,13 @@ const DBusEventSource = new Lang.Class({
         this._dbusProxy.run_dispose();
     },
 
+    get hasCalendars() {
+        if (this._initialized)
+            return this._dbusProxy.HasCalendars;
+        else
+            return false;
+    },
+
     _resetCache: function() {
         this._events = [];
         this._lastRequestBegin = null;

js/ui/dateMenu.js

@@ -161,8 +161,10 @@ const DateMenuButton = new Lang.Class({
         this._openClocksItem.actor.visible = app !== null;
     },
 
-    _setEventsVisibility: function(visible) {
+    _updateEventsVisibility: function() {
+        let visible = this._eventSource.hasCalendars;
         this._openCalendarItem.actor.visible = visible;
+        this._openClocksItem.actor.visible = visible;
         this._separator.visible = visible;
         if (visible) {
           let alignment = 0.25;
@@ -184,6 +186,9 @@ const DateMenuButton = new Lang.Class({
         this._eventList.setEventSource(eventSource);
 
         this._eventSource = eventSource;
+        this._eventSource.connect('notify::has-calendars', Lang.bind(this, function() {
+            this._updateEventsVisibility();
+        }));
     },
 
     _sessionUpdated: function() {
@@ -195,7 +200,7 @@ const DateMenuButton = new Lang.Class({
             eventSource = new Calendar.EmptyEventSource();
         }
         this._setEventSource(eventSource);
-        this._setEventsVisibility(showEvents);
+        this._updateEventsVisibility();
 
         // This needs to be handled manually, as the code to
         // autohide separators doesn't work across the vbox