Francesco Bochicchio wrote:
> One thing I don't understand, is why you need to 'poll' continuously
> for changes, except for demo purpose.
You can give the user immediate feedback on changes he makes. I'd argue that
e. g. an "auto-apply" dialog with a revert button is much more usable and am
surprised that this style hasn't caught on.
> If this is supposed to be a window for user to enter data into the
> program, the standard practice is to have a
> separate window (not the main one), with apply and cancel buttons,
> where both buttons close the window but only
> the apply button register the change. So you need to do the stuff you
> do in the poll_exams function only in the
> callback of the apply button.
If you want live updates you can also use StringVar.trace() instead of
polling:
from functools import partial
def grade_changed(name, index, var, *args):
new_grade = to_int(var.get())
if new_grade != exam_grades[index]:
exam_grades[index] = new_grade
print name, "-->", new_grade
pairs = zip(names, exam_grades_string)
for index, (name, var) in enumerate(pairs):
var.trace("w", partial(grade_changed, name, index, var))
See also http://effbot.org/tkinterbook/variable.htm
Peter
--
http://mail.python.org/mailman/listinfo/python-list
