Re: Application redrawing

["A B" <alvinbeach hotmail com>]

I have removed my pthread and decided to just call:


	/* computation going on */
         while (gtk_events_pending ())
	  gtk_main_iteration ();
	/* computation continued */

at the appropriate times. However, when I use gtk_progress_bar_pulse() the 
Progress Bar does redraw to a new pulse location. However, if I use 
gtk_progress_bar_set_fraction() with a new fraction for each call, it does 
not redraw. However, once the application is finished processing (the method 
returns) then the Progress Bar redraw to 100%.

So basically, my question is, why do _pulse() and _set_fraction() behaving 
differently?

Thanks,

-------
Alvin Beach
Email: alvinbeach@hotmail.com
Website: http://www.vianet.ca/~abeach




>From: Roland Smith <rsmith@xs4all.nl>
>Reply-To: rsmith@xs4all.nl
>To: gtk-app-devel-list@gnome.org
>Subject: Re: Application redrawing
>Date: Tue, 8 Apr 2003 19:44:31 +0200
>
>On Sun, 06 Apr 2003 16:53:41 -0400
>"A B" <alvinbeach@hotmail.com> wrote:
>
> > Hello,
> >
> > I am experimenting with GTK+. I am creating an app that does a lot of
> > processing. What I am having problems with is having the application 
>redraw
> > itself. I thought that if I put all the processing in a pthread that 
>would
> > help. But, this isn't the case.
> >
> > What do GTK+ programmers do to work around this?
>
>There are a couple of alternatives. Using threads is one of them (but not 
>the
>best IMHO). GTK+ depends on a regular flow of events. That means you 
>should:
>
>1 - split you calculation in little pieces that can be invoked via timeouts 
>or
>     idle functions.
>2 - allow GTK+ to process events from within your calculation
>3 - use a separate calculation program, that communicates with the GUI via 
>pipes
>4 - use threads. But do not issue gTK+ calls from the thread that does the
>     processing.
>
>For 1 see gtk_timeout_add() and gtk_idle_add().
>
>for 2 use something like:
>
>	/* computation going on */
>         while (gtk_events_pending ())
>	  gtk_main_iteration ();
>	/* computation continued */
>
>For 3 see g_spawn_async_with_pipes()
>
>Roland
>--
>R.F. Smith                           /"\    ASCII Ribbon Campaign
>r s m i t h @ x s 4 a l l . n l      \ /    No HTML/RTF in email
>http://www.xs4all.nl/~rsmith/         X     No Word docs in email
>                                      / \    Respect for open standards
><< attach3 >>


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