Re: Progress_bar failing to change

[Hrvoje Niksic <hrvoje niksic avl com>]

On 12/16/2014 09:12 PM, Ian Chapman wrote:
> Spot on Hrvoje, that's my problem, many thanks for the help.  I'll have
> to change the way I'm thinking.

The classic hack to update the progress bar without returning to the 
main loop is by running:

while (gtk_events_pending())
  gtk_main_iteration()

Still, be careful with this code because it can also trigger other 
queued events, such as user input, in places where you don't expect it.

A better approach is to structure your code so that a long-standing task 
is done in a separate thread, which uses idle_add to tell the GUI thread 
to update the progress bar (and anything else that might need updating).