Re: Progress Bar question

[muppet <scott asofyet org>]

On Aug 21, 2005, at 8:48 PM, Gergely Korodi wrote:

> I need a progress bar to display some status information inside a  
> callback function, but it only reacts once the function exists.  In  
> the following code the progress bar works fine if the button's  
> "clicked" signal is connected to cb2, but it bogs down with cb1.   
> How is it possible to do this?
[...]
> sub cb1 {
>     foreach $k (1..20) {
>         $fraction += 0.05;
>         $fraction = 0 if $fraction > 1;
>         print "+++ $k +++\n";
>         system "sleep 1";
>         $progress -> set_fraction ($fraction);
>     }
> }

The call to system() blocks, so the main loop cannot run, and  
therefore the gui does not update or respond to input.  Don't do that.

I assume you have real work happening in the place of "sleep 1"...   
either fork the child asynchronously, or break the job up into  
smaller chunks.  If you fork asynchronously, you can either just let  
it go, or use a pipe open to read its output back.

"How do i keep my gui updating during a long file read?"
http://live.gnome.org/ 
GTK2_2dPerl_2fFrequentlyAskedQuestions#head-3b88c68683fd189b09455a462d5e 
41669b7b1142

and

perldoc perlipc



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