Just add it :).

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import gtk
import cairo
import gobject

class TransparentWindow(gtk.Window):

    @staticmethod
    def _transparent_expose(widget, event):
        cr = widget.window.cairo_create()
        cr.set_operator(cairo.OPERATOR_CLEAR)
        region = gtk.gdk.region_rectangle(event.area)
        cr.region(region)
        cr.fill()
        return False

    def __init__(self, *args, **kwargs):
        gtk.Window.__init__(self, *args, **kwargs)
        rgba = self.get_screen().get_rgba_colormap()
        self.set_colormap(rgba)
        self.set_app_paintable(True)
        self.connect("expose-event", self._transparent_expose)

if __name__ == "__main__":
    window = TransparentWindow()
    box = gtk.VBox()
    window.add(box)

    label = gtk.Label("This is a transparent window.")
    box.add(label)

    button = gtk.Button("Click me!")
    box.add(button)

    window.show_all()
    gobject.MainLoop().run()

Philippe Lawrence (France)

(Note: I will probably not be able to work on this for a week because of some school work…)

Remember that setting the DOCK hint for some (probably totally obvious) reason does so you can’t move the widget with the window manager (Alt+mouse button).