sandbox_mail wrote:
> Hi folks,
> in my GUI I have an entry where the user is supposed to enter an
> expression according to a specific syntax.
> If the user makes a mistake, the entry turn red.
>
> This works quite well but there is one usability flaw:
> Right now I use the "changed" signal to invoke checking of the contents.
> Therefore the entry turns red right after the first character has been
> entered.
>
> Is there an elegant way (maybe another signal) to delay the checking?
> Like in a wordprocessor I would like to change the color only after no
> further typing was done for ~1 sec. or if the entry loses focus.
>
> Thanks for any hints!
I have used code that looks roughly like this:
class DelayedCall(object):
def __init__(self, delay, callback):
self._delay = delay
self._callback = callback
self._id = 0
def call(self):
if self._id != 0:
gobject.source_remove(self._id)
self._id = gobject.timeout_add(self._delay, self._timeout)
def _timeout(self):
self._id = 0
self._callback()
return False
Call 'call()' whenever the entry changes. Your callback will be called
when nothing has happened in the last 'delay' milliseconds. You may
need something to force an early check on focus-out-event for the entry
or when the user clicks an "Ok" button for example.
--
Tim Evans
Applied Research Associates NZ
http://www.aranz.com/
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