[gnome-shell] VolumeMenu: show headphone icon when headphones are plugged in

[Giovanni Campagna <gcampagna src gnome org>]

commit 784b04b191022b3b4e349ed123a2976ccb4007bb
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Thu Oct 18 19:42:17 2012 +0200

    VolumeMenu: show headphone icon when headphones are plugged in
    
    This will show the user where sound will come out, and should
    help if he forgets them plugged, or forgets to plug them before
    playing music.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=675902

 js/ui/status/volume.js |   41 +++++++++++++++++++++++++++++++++++++++--
 1 files changed, 39 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/status/volume.js b/js/ui/status/volume.js
index 7f91e66..99b003b 100644
--- a/js/ui/status/volume.js
+++ b/js/ui/status/volume.js
@@ -2,6 +2,7 @@
 
 const Clutter = imports.gi.Clutter;
 const Lang = imports.lang;
+const Gio = imports.gi.Gio;
 const Gvc = imports.gi.Gvc;
 const St = imports.gi.St;
 
@@ -32,6 +33,8 @@ const VolumeMenu = new Lang.Class({
     _init: function(control) {
         this.parent();
 
+        this.hasHeadphones = false;
+
         this._control = control;
         this._control.connect('state-changed', Lang.bind(this, this._onControlStateChanged));
         this._control.connect('default-sink-changed', Lang.bind(this, this._readOutput));
@@ -98,20 +101,47 @@ const VolumeMenu = new Lang.Class({
         }
     },
 
+    _findHeadphones: function(sink) {
+        // This only works for external headphones (e.g. bluetooth)
+        if (sink.get_form_factor() == 'headset' ||
+            sink.get_form_factor() == 'headphone')
+            return true;
+
+        // a bit hackish, but ALSA/PulseAudio have a number
+        // of different identifiers for headphones, and I could
+        // not find the complete list
+        let port = sink.get_port();
+        if (port)
+            return port.port.indexOf('headphone') >= 0;
+
+        return false;
+    },
+
+    _portChanged: function() {
+        this.hasHeadphones = this._findHeadphones(this._output);
+        this.emit('headphones-changed');
+    },
+
     _readOutput: function() {
         if (this._outputVolumeId) {
             this._output.disconnect(this._outputVolumeId);
             this._output.disconnect(this._outputMutedId);
+            this._output.disconnect(this._outputPortId);
             this._outputVolumeId = 0;
             this._outputMutedId = 0;
+            this._outputPortId = 0;
         }
         this._output = this._control.get_default_sink();
         if (this._output) {
             this._outputMutedId = this._output.connect('notify::is-muted', Lang.bind(this, this._mutedChanged, '_output'));
             this._outputVolumeId = this._output.connect('notify::volume', Lang.bind(this, this._volumeChanged, '_output'));
-            this._mutedChanged (null, null, '_output');
-            this._volumeChanged (null, null, '_output');
+            this._outputPortId = this._output.connect('notify::port', Lang.bind(this, this._portChanged));
+
+            this._mutedChanged(null, null, '_output');
+            this._volumeChanged(null, null, '_output');
+            this._portChanged();
         } else {
+            this.hasHeadphones = false;
             this._outputSlider.setValue(0);
             this.emit('icon-changed', 'audio-volume-muted-symbolic');
         }
@@ -227,6 +257,12 @@ const Indicator = new Lang.Class({
             this.setIcon(icon);
             this._syncVisibility();
         }));
+        this._volumeMenu.connect('headphones-changed', Lang.bind(this, function() {
+            this._syncVisibility();
+        }));
+
+        this._headphoneIcon = this.addIcon(new Gio.ThemedIcon({ name: 'headphones-symbolic' }));
+        this._headphoneIcon.visible = false;
 
         this.menu.addMenuItem(this._volumeMenu);
 
@@ -239,6 +275,7 @@ const Indicator = new Lang.Class({
     _syncVisibility: function() {
         this.actor.visible = this._hasPulseAudio;
         this.mainIcon.visible = this._hasPulseAudio;
+        this._headphoneIcon.visible = this._hasPulseAudio && this._volumeMenu.hasHeadphones;
     },
 
     _onScrollEvent: function(actor, event) {