#!/usr/bin/perl
use warnings;
use strict;
use Tk;
use Tie::Watch;

my $mw = MainWindow->new;

$mw->fontCreate('big',
   -weight=>'bold',
   -size=> 18
   );


my $foo='neutrino';

my $watch = Tie::Watch->new(-variable => \$foo, -store => \&store_callback);

my $entry = $mw->Entry(-textvariable => \$foo,
                -bg => 'white',
                -font => 'big')->pack;
$entry->icursor('end');
$entry->focus;

my $testbutton;
$testbutton = $mw->Button(-text => 'Foo Watcher', 
              -state => 'disabled',   
              -command => sub{ print "$foo\n";
               $testbutton->configure(-state => 'disabled', 
               -bg=>'white',
               -activebackground => 'white',
               );     
              
                },
               -bg => 'white',
               -font => 'big',
            )->pack;

my $quit = $mw->Button(-text => 'Quit', -command => sub {
    print "Final value=$foo.\n";
    exit;
})->pack;


# a simple


MainLoop;

sub store_callback {
    print "In store_callback, self=$_[0], new_value=$_[1].\n";
    
    $testbutton->configure( -state => 'normal', 
    -bg => 'yellow',
    -activebackground => 'yellow',
     );

    $_[0]->Store($_[1]);
}