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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