Re: changing a combo's popdown strings from select-list callback?

[Skip Montanaro <skip pobox com>]

    John> Hi Skip, I don't know if this is still true for 1.3, but with gtk
    John> 1.2 you got a core if you removed the item with focus from a popup
    John> list. I worked around this by doing a gtk_widget_grab_focus()
    John> somewhere else before doing the delete.

FWIW, I wound up subclassing the Combo widget (in Python) and making the
set_popdown_strings method a bit smarter.  It checks to see if its list
widget's toplevel window is visible, and if so, connects to that widget's
unmap signal to defer the actual setting:

    def deferred_popdown_cb(self, *args):
        self.list_parent.disconnect(self.popdown_id)
        gtk.Combo.set_popdown_strings(self, self.popdown_strings)

    def set_popdown_strings(self, strings):
        self.popdown_strings = strings
        self.list_parent = self.list.get_toplevel()
        if self.list_parent and (self.list_parent.flags() & gtk.MAPPED):
            self.popdown_id = self.list_parent.connect("unmap",
                                                  self.deferred_popdown_cb)
        else:
            gtk.Combo.set_popdown_strings(self, self.popdown_strings)

I'm not sure that's the best way to do it, but it worked for me.  Perhaps
gtk_combo_set_popdown_strings should do something like this by default.
Alternatively, it would be nice if the GtkCombo documentation warned about
the potential problems of mucking with the list while it's active.

-- 
Skip Montanaro (skip pobox com)
http://www.mojam.com/
http://www.musi-cal.com/