Add a custom text to GNOME panel

Simple Gnome extension may be worth to try. (I'm not sure about naming, in Ubuntu 14.04: Gnome classic uses same Gnome shell extensions, Where old classic renamed to Gnome Fallback)

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Gnome Classic & Mate

1. Download panel-applet-generator

2. Generate a new applet:

   python panel-applet-generator.py -n mylabel -d "my custom label"
   

3. Modify mylabelApplet.py

   try:
       from gi.repository import Gtk
   except: # Can't use ImportError, as gi.repository isn't quite that nice...
       import gtk as Gtk
   
   def applet_factory(applet, iid, data = None):
       button = Gtk.Button("It works!")
       label = Gtk.Label("It works!")
       applet.add(label)
       applet.show_all()
       return True
   

   I added label = Gtk.Label("It works!") and modified applet.add(label) (It was applet.add(button))

4. Compress mylabel folder as tar.gz then rename it to mylabel_1.0.orig.tar.gz

5. Build Debian package

   cd mylabel/
   debuild -us -uc
   

6. Install package

   sudo dpkg -i ../*.deb
   

7. Alt+Right Click or Super+Alt+Right Click on panel, then add to panel

8. Look for mylabel applet, then add

References:

• Making panel applets for Gnome 2 and 3
• IntroDebianPackaging

Note:

• If for any reason unable to install, It is possible to do it manually:

  sudo cp org.gnome.applets.mylabel.panel-applet /usr/share/gnome-panel/4.0/applets/
  sudo cp org.gnome.panel.applet.mylabel.service /usr/share/dbus-1/services/
  sudo cp *.py /usr/lib/gnome-applets/
  

  32bit system:

  sudo cp mylabel.server /usr/lib/bonobo/servers/ 
  

  64bit system:

  sudo cp mylabel.server /usr/lib/x86_64-linux-gnu/bonobo/servers/
  

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Gnome Shell

I have tested it with Gnome 3.10:

1. Install Gnome tweak tool

   sudo apt-get install gnome-tweak-tool
   

2. Create new extension:

   gnome-shell-extension-tool --create-extension
   

3. Enter requested info: name My Label, description Extension shows my custom text, uuid mylabel@yourname or leave as default mylabel@hostname

   Extension created in /home/username/.local/share/gnome-shell/extensions/mylabel@hostname

4. extension.js is auto opened. Replace Icon with your custom label. As below:

   function init() {
       button = new St.Bin({ style_class: 'panel-button',
                             reactive: true,
                             can_focus: true,
                             x_fill: true,
                             y_fill: false,
                             track_hover: true });
       let icon = new St.Icon({ icon_name: 'system-run-symbolic',
                                style_class: 'system-status-icon' });
   
       let label = new St.Label({ text: "Hello, world!" });
       button.set_child(label);
       button.connect('button-press-event', _showHello);
   }
   

   I added let label = new St.Label({ text: "Hello, world!" }); and modified 'button.set_child(label); (It was button.set_child(icon);)

5. Save, Restart Gnome-Shell using Alt+F2, enter r then Enter

6. Launch Gnome Tweak Tool → Extensions → Enable My Label extension.

7. Restart Gnome-Shell again.

   

References:

• Step by step tutorial to create extensions
• St Reference Manual
• Documentation for writing Gnome shell extensions
• Making GNOME Shell Extensions