#!/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;

my $canvas = $mw->Canvas(-width => 300, -height => 300,
                -bg => 'black',
	   )->pack();

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

my $leave = 0;

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

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


$mw->bind( '<3>',sub { 
        print "1\n";
        my $width = $mw->width - 10;
        my $height = $mw->height - 10;;
           $canvas->configure(-width=> $width, -height => $height);
           $mw->update;
         } );


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;
}