pygtk: overriding gtk.Paned.compute_position

Question

I have a HPaned that one of its children changes its size requirement frequently, since its text changes. The result is that the pane moves every time the text is changed. I'd like to override the Paned.compute_position method so that the size of the child will not decrease, just increase. However, I can't find a way to override it. Even

class MyHPaned(gtk.HPaned):
    def do_compute_position(self, allocation, child1_req, child2_req):
        print "Hi"
        return gtk.HPaned.compute_position(self, allocation, child1_req, child2_req)
gobject.type_register(MyHPaned)

doesn't work. Do you have a suggestion? Thanks!

Answer 1

Overriding gtk_paned_compute_position is not possible, since that function is not virtual in GTK itself. Also, gtk_paned_compute_position is marked as internal and deprecated and is not called anywhere from GTK+-2.24.x sources. I suspect it was only exported so that you could find out the position of the separator, not to affect it through overriding.

Instead of attempting to override HPaned.compute_position, you should place into the paned a single-child container (e.g. a child of gtk.Bin) that implements the desired resizing policy by hooking into the size-allocate signal and calling set_size_request with the desired size. This will be automatically respected by HPaned.