[PyKDE] Window refresh from another process

[Phil Thompson]

On Wednesday 02 July 2003 4:47 pm, Albert Cervera Areny wrote:
> > On Wed, Jul 02, 2003 at 12:07:56PM +0200, Albert Cervera Areny wrote:
> >> >>   The problem is that when the event occurs the window isn't
> >>
> >> refreshed
> >>
> >> >> until I move the mouse cursor. The XML-RPC process calls the window
> >> >> addEvent function (I've written) and the last thing it does is
> >>
> >> calling
> >>
> >> >> self.repaint(0) but it doesn't work.
> >> >>
> >> >>   Does somebody have a clue of how I could solve this?
> >> >
> >> > Is self.update() any better?
> >>
> >> No. It's exactly the same
> >
> > I suppose that you're running the XML-RPC server at one thread and the
> > graphic front-end at another. If that's the case, are you aware that you
> > can't simply update the graphics from the XML-RPC thread, but only from
> > the main, graphics, thread (it is, if you want immediate results)? It's
> > the same you can see with Java's SWING, and others.
>
> Then, how could I do this? The XML-RPC server is blocking and can't think
> how I could make it run in the same thread.
> Another possibility would be repainting from the GUI thread, I imagine,
> but I can't see how could I do this at regular intervals once the
> exec_loop() function is called. Is there a way of doing the loop myself
> and calling some qt function at each iteration?

What about the technique used in the semaphore.py example? Define a 
QCustomEvent that describes the GUI changes the XML-RPC thread wants and call 
QApplication.postEvent() - which is thread safe. Your main GUI thread 
processes the event and updates the GUI as required.

Phil