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Re: Gtk ProgressBar problem

Tristan Van Berkom wrote:

christophe meyer wrote:

Hi all,
In my glade designed project i need to update a progressbar when a callback function is called like in this short example:

void on_button_clicked (GtkButton * button, gpointer user_data)
{
GtkWidget *Progress_Bar = lookup_widget (GTK_WIDGET (button), "progressbar");

   action_function1();
   gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (Progress_Bar), 0.2);
   action_function2();
   gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (Progress_Bar), 0.4);
   action_function3();
   gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (Progress_Bar), 0.6);
   action_function4();
   gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (Progress_Bar), 0.8);
   action_function5();
   gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (Progress_Bar), 1.0);
}

Each action_function() takes 2 or 3 seconds to finish.
The matter is that when the callback function is called, nothing happens between the action_functions() with the bar, and at the end, once action_function5() is finished the progressbar updates directly to 100%.
Home can i gradualy update my progressbar while executing my callback function ?


while (gtk_events_pending()) gtk_main_iteration_do(FALSE);

This pretty line of code will process all gtk pending events by
nesting the mainloop (as opposed to simply returning to it).

You could go about this in a number of ways, here are a few:
- you could start a timout func that calls your action_func() once every
timout and then you wouldn't need to nest the main loop
- you could insert that handy afore mentioned line between action_func()s
- if you want to be really meticulous and have your UI responsive
*during* the action func's, then you could use threads.
- if you want your ui to stay responsive but want to avoid the trouble
and/or complexity that comes with using threads, then you could open up
action_func.c and scatter that afore mentioned handy line all over the place.

Cheers,
                              -Tristan

Hi,

Here's an example I put together to help myself understand how to use threads and
progressbars together. Hopefully, it will help you too :-)

http://severna.homeip.net/source/examples/progress-5-21-2004.tar.gz

-todd


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