Verifying Entry inputs

Hi all,

I'd like to have Entry widgets that allow only numbers (float) as inputs, and 
only
in a certain range. This verification should be done as soon as the user is done
with editing. I tried the focus-out-event, but pygtk didn't like me bringing up 
a
modal (error) dialog in the callback. Second try was with an insert-text handler
which just ignored invalid inputs. It looks like this:

def myInsertText(self, widget, new_text, new_text_length, position):
        oldtext = widget.get_text()
        # Avoid recursion
        widget.handler_block(widget.mySigHandID)
        # Insert text and check for validity
        pos = widget.get_position()
        widget.insert_text(new_text, pos)
        newtext = widget.get_text()
        try:
            value = float(newtext)
        except ValueError:
            # Restore previous contents
            widget.delete_text(pos, pos + new_text_length)
            # XXX Something like a beep might be nice here
        else:
            widget.set_position(pos + new_text_length)
        widget.handler_unblock(widget.mySigHandID)

        # Keep normal handler from running
        widget.stop_emission("insert-text")

In this version I simply can't get the cursor to appear *after* the
inserted text, the widget.set_position() call seems to do just nothing.

Is there a fundamental flaw in my routine or my whole concept?
I'd be really glad to get some recommendations.

Thanks,
Hans-J. Widmaier
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