python GTK3 limit label width

So here is a solution (still not the exact pixel width) You can use Gtk.Widget.set_halign to force no horizontal expansion.

Here is the part of the code:

    lbl=gtk.Label(label)
    lbl.set_max_width_chars(5)
    lbl.set_ellipsize(pango.EllipsizeMode.END)
    lbl.set_halign(gtk.Align.CENTER)
    self.add(lbl)

This is what it looks like:

I hope I did not miss anything this time.

You do have another option: use a custom GtkContainer implementation that limits its children to exact pixel widths. According to Erick Pérez Castellanos on irc.gimp.net/#gtk+, GNOME Contacts has one; here it is. It's in Vala, but it shouldn't be too hard to wrap your head around alongside some reading of the GtkWidget and GtkContainer (and GtkBin) semantics. Unfortunately I do not know how to create new GObjects in Python, sorry.

If you do use the approach in GNOME Contacts, the custom container (which derives from GtkBin, a convenience for single-child GtkContainers) will hold just your GtkLabel, and you add that to the flowbox item's GtkVBox.

Hopefully that helps.