#!/usr/local/bin/perl -w
use strict;
use Tk;
my $mw = MainWindow->new;
my $text = '0123456789';
my $e = $mw->Entry(-validate => 'all', -textvariable => \$text,
-vcmd => \&validate,
-invcmd => sub { $mw->bell })->pack;
my $l = $mw->Label(-textvariable => \$text)->pack;
$mw->Button(-text => 'Set', -command => sub { $text = '0123456789' })->pack;
$mw->Button(-text => 'MisSet', -command => sub { $text = 'A012345678' })->pack;
$mw->Button(-text => 'Quit', -command => [destroy => $mw])->pack;
MainLoop;
sub validate
{
my @args = @_;
foreach (@args)
{
$_ = defined ($_) ? "'$_'" : 'undef';
}
print 'validate ',join(',',@args),"\n";
return $_[0] =~ /^\d*$/;
}