Hi,
On Fri, 22 Feb 2013 01:50:45 -0800 (PST)
lansman <codel...@gmail.com> wrote:
> Anybody know why it happens?
this is a common issue. To illustrate what's going on, I changed your
validate callback a little into:
def _validate(self, d, i, P, s, S, v, V, W):
print '"%s"' % P, P.isdigit()
return P.isdigit()
then I ran the program and got:
$ python test8.py
"111" True # -> program start
"111" True # -> selected the 111 with the mouse
"" False # -> pressed the 9 key
"9111" True
So we see, what happens is that when the selected "111" is overwritten
with "9" the Entry is *emptied first*, the empty string validates to
False and is therefore not accepted by the widget and so the 111 remains
in the widget when the 9 is inserted.
So the trick here is to let the widget accept the empty string, as in:
def _validate(self, d, i, P, s, S, v, V, W):
if P == '':
return True
return P.isdigit()
Regards
Michael
.-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-.
Lots of people drink from the wrong bottle sometimes.
-- Edith Keeler, "The City on the Edge of Forever",
stardate unknown
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