How to write an application for the system tray in Linux

Question

The Qt framework contains a QSystemTrayIcon class. This means that you can write an application in C++ or Python (or any other language with Qt bindings, including C#, Ada, Pascal, Perl, PHP and Ruby) and run your application on Windows, Linux, Mac or any other supported Qt operating system. I should add that Qt applications generally do a pretty good job of looking native on whatever operating system you are using without very much effort (even between Gnome/KDE on Linux). Qt also has excellent documentation, lots of sample code, a generous license and is well-maintained.

python-eggtrayicon

here's the example that comes with the debian package python-eggtrayicon in debian/testing...

#!/usr/bin/python
import pygtk
pygtk.require("2.0")
import gtk
import egg.trayicon
t = egg.trayicon.TrayIcon("MyFirstTrayIcon")
t.add(gtk.Label("Hello"))
t.show_all()
gtk.main()

It just shows a label in the notification area . (Search on that, and you'll probably get much better hits...)

Qt is cross platform and has support for the system tray. Its Python bindings are pretty good as well. See the example application for further details.

From a python prompt try this.

import gtk

icon = gtk.StatusIcon()
icon.set_from_stock(gtk.STOCK_ABOUT)

gtk.main()

You should see an icon in the system tray.

See this snippet for a bigger example.