[PyKDE] GUI not updateing ?

[Andreas Pakulat]

On 24.09.06 14:38:13, Detlev Offenbach wrote:
> On Sunday 24 September 2006 13:44, Andreas Pakulat wrote:
> > On 24.09.06 13:16:11, Detlev Offenbach wrote:
> > > On Sunday 24 September 2006 12:55, Dave S wrote:
> > > > My main window has a progress bar in it. When I click a button my
> > > > script starts a thread for a backend script that takes some time to
> > > > run.
> > > >
> > > > The backend script passes data including its progress to my main script
> > > > via a FIFO, now I have a problem.
> > > >
> > > > The FIFO is providing progress data that is being written to the GUI
> > > > with self.progressBar1.setProgress(pc, 100) but nothing is being shown
> > > > until my script exits.
> > > >
> > > > So the GUI is not updated while I am in a while loop looking for FIFO
> > > > data ? If so how do you guys get around this ?
> > >
> > > Try QApplication.processEvents() after the setProgress call.
> >
> > Or use events to communicate the progress. I haven't had the experience
> > yet, but many qt and kde developers say that processEvents is evil and
> > should be avoided, it might have mysterious side effects.
> 
> Which ones?

Thought that would obvious: I don't know any, apart from crashes because
objects get deleted under your feet, I think there are also GUI things
that can go wrong. Try to use the lists.kde.org search interface and
check kde-devel and kde-core-devel, eventually also qt-interest.

Andreas

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