[pygtk] A "delayed changed" signal for text entries?

[sandbox_mail]

@Tim, this looks like a good solution, I'll try it out.

@Tobias, I did not quite get it. What do you mean by "do an idle_add"?

Thanks,
freddy

Tim Evans wrote:
> 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.
>