Not to be picky about it, but don't even use sleep to demonstrate a slowdown..... in a GUI it completely gives you bad behavior. Here is one way to make a non-blocking delay without sleep
#!/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 = $mw->repeat(1000, sub{$var++} );
$loop =1;
while($loop){
$loop++;
$mw->waitVariable(\$var);
$count++;
}
DoOneEvent();
}
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