#!/usr/bin/perl
use warnings;
use strict;
use Tk;
my $mw = new MainWindow;

my $current_size = $mw->reqwidth . "x" . $mw->reqheight;
my $old_current_size = $current_size;

$mw->bind( '<Configure>', sub{ &OnResize });

my $leave = 0;
$mw->bind( '<Leave>',sub { $leave = 1; } );

$mw->bind( '<Enter>',sub { $leave = 0; 
                           &OnResize;
			 } );

MainLoop;

sub OnResize {
      
    my $current_size = $mw->width . "x" . $mw->height;
    if( $leave == 1) {return }
    if($old_current_size eq $current_size){return}


     ## Resize has occurred do something:
     printf( "Resize happened - old size: %s, new size: %s\n",
                             $old_current_size, $current_size );
    ## set the old size to the new size
    $old_current_size = $current_size;
}