Re: gtk progress bar and gdk_flush()

[Tristan Van Berkom <vantr touchtunes com>]

Hi Tom,

   In order to avoid hijacking of the main
event loop you could take an approach like this:

/***************************************************/
cooperative_loop_source_id =
   g_timeout_add(interval/* itteration frequency in millisecs */,
                           cooperative_loop, NULL);

gboolean cooperative_loop(gpointer data)
{
   static int i = 0;
   if (i == 0) {
       // initialize loop stuff ...
       // allocate resources...
   }
   if (i < MAX_ITTERATIONS) {
       // loop body
   }
   if (i >= MAX_ITTERATIONS) {
       // free resources
       // and maybe notify end of loop processing.
       return FALSE;
   }
   return TRUE;
}
/***************************************************/

And now you should have no problems updateing your UI.

Cheers,
                                       -Tristan


Tom Liu wrote:

> Thank you for your answer, But the thing is that you update the progress
> bar in a time_out call back.
>
> I have to put the progress bar in a long loop, didn't return to
> gtk_main.
> Which most progress bar should been used in a long loop task to show how
> many percentage is done, after the task finish, return to main loop.
>
> Thanks.
>
>
> -----Original Message-----
> From: gtk-app-devel-list-admin gnome org
> [mailto:gtk-app-devel-list-admin gnome org] On Behalf Of Carlos Pereira
> Sent: Friday, October 24, 2003 12:22 PM
> To: gtk-app-devel-list gnome org
> Subject: Re: gtk progress bar and gdk_flush()
>
>  
>
> > I am working on the progress bar, I can't my progress bar updated in a
> > loop:
> > Even the gdk_flush() can't make it update on screen.
> >    
>
> This works on Gtk1.2 (continuous mode):
> Carlos
>
> ----------------------------------------
> int app_gtk_statusbar_progress (gpointer data)
> {
> double new_value;
> GtkAdjustment *adj;
>
> new_value = gtk_progress_get_value (GTK_PROGRESS (data)) + 1;
> adj = GTK_PROGRESS (data)->adjustment;
> if (new_value > adj->upper) new_value = adj->lower;
> gtk_progress_set_value (GTK_PROGRESS (data), new_value);
>
> return TRUE;
> }
>
> timer_progress = gtk_timeout_add (100,
> app_gtk_statusbar_progress, progress_bar);
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