[gnome-shell] VolumeStatus: track PulseAudio state and hide when disconnected

[Giovanni Campagna <gcampagna src gnome org>]

commit a64e0e1f49a058eb41583f631bfc71e2731dddf9
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Mon Mar 28 16:10:11 2011 +0200

    VolumeStatus: track PulseAudio state and hide when disconnected
    
    Only show the menu when the associated GvcMixerControl is ready, as
    the connection can fail or PulseAudio may not be installed.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=645708

 js/ui/status/volume.js |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)
---
diff --git a/js/ui/status/volume.js b/js/ui/status/volume.js
index 0c02a9e..98e8d30 100644
--- a/js/ui/status/volume.js
+++ b/js/ui/status/volume.js
@@ -29,7 +29,7 @@ Indicator.prototype = {
         PanelMenu.SystemStatusButton.prototype._init.call(this, 'audio-volume-muted', null);
 
         this._control = new Gvc.MixerControl({ name: 'GNOME Shell Volume Control' });
-        this._control.connect('ready', Lang.bind(this, this._onControlReady));
+        this._control.connect('state-changed', Lang.bind(this, this._onControlStateChanged));
         this._control.connect('default-sink-changed', Lang.bind(this, this._readOutput));
         this._control.connect('default-source-changed', Lang.bind(this, this._readInput));
         this._control.connect('stream-added', Lang.bind(this, this._maybeShowInput));
@@ -102,9 +102,14 @@ Indicator.prototype = {
         this._notifyVolumeChange();
     },
 
-    _onControlReady: function() {
-        this._readOutput();
-        this._readInput();
+    _onControlStateChanged: function() {
+        if (this._control.get_state() == Gvc.MixerControlState.READY) {
+            this._readOutput();
+            this._readInput();
+            this.actor.show();
+        } else {
+            this.actor.hide();
+        }
     },
 
     _readOutput: function() {