[gnome-shell] Add indicator for location service being used

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit d163b92e0bd8662aa42afc518726c5ce93e5a61e
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Tue Jan 28 17:41:26 2014 +0000

    Add indicator for location service being used
    
    If an application is accessing location through geoclue, show an
    indicator in the panel for that so that user knows.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=709372

 js/js-resources.gresource.xml |    1 +
 js/ui/panel.js                |    2 +
 js/ui/status/location.js      |   58 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 61 insertions(+), 0 deletions(-)
---
diff --git a/js/js-resources.gresource.xml b/js/js-resources.gresource.xml
index 0369708..6d9d585 100644
--- a/js/js-resources.gresource.xml
+++ b/js/js-resources.gresource.xml
@@ -101,6 +101,7 @@
 
     <file>ui/status/accessibility.js</file>
     <file>ui/status/brightness.js</file>
+    <file>ui/status/location.js</file>
     <file>ui/status/keyboard.js</file>
     <file>ui/status/network.js</file>
     <file>ui/status/power.js</file>
diff --git a/js/ui/panel.js b/js/ui/panel.js
index 5ffd7b9..a545552 100644
--- a/js/ui/panel.js
+++ b/js/ui/panel.js
@@ -825,8 +825,10 @@ const AggregateMenu = new Lang.Class({
         this._brightness = new imports.ui.status.brightness.Indicator();
         this._system = new imports.ui.status.system.Indicator();
         this._screencast = new imports.ui.status.screencast.Indicator();
+        this._location = new imports.ui.status.location.Indicator();
 
         this._indicators.add_child(this._screencast.indicators);
+        this._indicators.add_child(this._location.indicators);
         this._indicators.add_child(this._network.indicators);
         if (this._bluetooth) {
             this._indicators.add_child(this._bluetooth.indicators);
diff --git a/js/ui/status/location.js b/js/ui/status/location.js
new file mode 100644
index 0000000..4a46014
--- /dev/null
+++ b/js/ui/status/location.js
@@ -0,0 +1,58 @@
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+
+const Gio = imports.gi.Gio;
+const Lang = imports.lang;
+
+const PanelMenu = imports.ui.panelMenu;
+
+var GeoclueIface = '<node> \
+  <interface name="org.freedesktop.GeoClue2.Manager"> \
+    <property name="InUse" type="b" access="read"/> \
+  </interface> \
+</node>';
+
+const GeoclueManager = Gio.DBusProxy.makeProxyWrapper(GeoclueIface);
+
+const Indicator = new Lang.Class({
+    Name: 'LocationIndicator',
+    Extends: PanelMenu.SystemIndicator,
+
+    _init: function() {
+        this.parent();
+
+        this._indicator = this._addIndicator();
+        this._indicator.icon_name = 'find-location-symbolic';
+        this._sync();
+
+        this._watchId = Gio.bus_watch_name(Gio.BusType.SYSTEM,
+                                           'org.freedesktop.GeoClue2',
+                                           0,
+                                           Lang.bind(this, this._onGeoclueAppeared),
+                                           Lang.bind(this, this._onGeoclueVanished));
+    },
+
+    _sync: function() {
+        if (this._proxy == null) {
+            this._indicator.visible = false;
+            return;
+        }
+
+        this._indicator.visible = this._proxy.InUse;
+    },
+
+    _onGeoclueAppeared: function() {
+        // FIXME: This should be done async
+        this._proxy = new GeoclueManager(Gio.DBus.system,
+                                         'org.freedesktop.GeoClue2',
+                                         '/org/freedesktop/GeoClue2/Manager');
+        this._proxy.connect('g-properties-changed', Lang.bind(this, this._sync));
+
+        this._sync();
+    },
+
+    _onGeoclueVanished: function() {
+        this._proxy = null;
+
+        this._sync();
+    }
+});