[Qt-interest] repaint()

[phil prentice]

Hi Andre

  I will certainly bear that in mind.  At the moment I do visit the event loop 
via QCoreApplication::processEvents(); inside the continuos loop.  Its all 
actually working very well for me at the moment???
  I did not want to go to the extra effort of yet another thread in my 
application when what I am doing seems to work well as it is It just keeps it 
so simple!!
  Also when my application goes into the continuos loop only a subset of 
widgets are enabled. Its almost a special state where the user selects a 
button in order to get continuos feedback from the hardware (drawn as 
graphs). 

  However I will let you know if things go badly for me, but at the moment as 
I say it seems to work fine.

I will keep you posted
Thankyou very much

Phil
On Tuesday 21 September 2010 19:07, Andre Somers wrote:
>   Op 21-9-2010 21:03, phil prentice schreef:
> > On Tuesday 21 September 2010 17:49, Frank Lutz wrote:
> >> As i can remamber you do not need to repaint(), or update. The
> >> Application updates by itself.
> >> _______________________________________________
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> >
> > What I am doing is a bit different in that my App is stuck in a continuos
> > for loop (talking to the hardware) and I have to force a repaint in order
> > to update the screen.
>
> That is probably not a good idea. Qt needs the eventloop to run with
> some frequency to make the app behave properly. For instance, your app
> needs to respond to user interaction. In your design, that will not work
> properly. Perhaps you should rethink your design a bit. If you really
> need to talk to the hardware continuously, you might use a separate
> thread. You can then use signals from the worker object running in the
> thread to the GUI to update your graphs.
>
> André
>
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