Sorry it didn't work for you, but I noticed I didn't quite show the code correctly, neglecting to define $timer, after declaring it as a global. That's maybe why your script dosn't cancel. Also, there is a method DoOneEvent which is very useful to force Tk to update everything before proceeding.

Here is a little something for you to play with, for waitVariable 

#!/usr/bin/perl
use warnings;
use strict;
use Tk;

$|=1;

my $count = 0;
my $loop  = 0;
my $mw    = new MainWindow();

$mw->Label( -textvariable => \$count )->pack;

$mw->Button( -text => 'Start', -command => \&long_job )
  ->pack( -side => 'left' );

$mw->Button( -text => 'Stop', -command => sub { $loop = 0; print "$cou
+nt\n"; } )
  ->pack( -side => 'left' );

MainLoop();




sub long_job {

my $var;
my $timer = $mw->repeat(100, sub{$var++} ); 

   $loop =1;       
   while($loop){
          $loop++;
          $mw->waitVariable(\$var);
          $count++;
         }
  DoOneEvent();  #must call or will block gui
}

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I'm not really a human, but I play one on earth.
Old Perl Programmer Haiku ................... flash japh

In reply to Re^3: Perl/Tk repeat method, callback doesn't work if... by zentara
in thread Perl/Tk repeat method, callback doesn't work if... by NewMonkMark

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