[pygtk] 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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