QTimer and PyQt

Adrian Casey news at outbacklinux.com
Thu Jul 22 12:56:37 CEST 2004

Jim wrote:

> Phil Thompson wrote:
>> On Tuesday 20 July 2004 12:41 pm, Adrian Casey wrote:
>>> 2.  At timeout, check if any fields have changed (using the isChanged()
>>> method.) and if so, reset the timer.
>> For 2., you would have to iterate over each widget.
> Most input widgets emit a signal when their value changes ("textChanged",
> "currentChanged", "valueChanged", "clicked", etc). You could connect all
> of the signals from the widgets to a single slot which resets the timer.
> See both the Qt and PyQt docs on signals and slots.
> I liked the suggestion about revalidating the user when the user presses
> "ok" better though.
> Jim

So do I Jim.  I settled on Phil's suggestion and implemented an eventFilter
for each QLineEdit object (using queryList("QLineEdit")) and the
installEventFilter method.  Works like a champ!

Essentially, the eventFilter checks the events registered by each field and,
if they are keystrokes, a self.timer.changeinterval(120000) is done to
restart the timer with a 2 minute timeout.

Thanks again for your responses.


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