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#!/usr/local/bin/perl -w
use Tk;
use strict;
{
package Tk::LimitEntry;
require Tk::Entry;
@Tk::LimitEntry::ISA = qw(Tk::Entry);
Construct Tk::Widget 'LimitEntry';
sub Insert
{
my ($w,$char) = @_;
my $width = $w->cget('-width');
my $len = $w->index('end');
if ($len >= $width)
{
$w->bell;
}
else
{
$w->SUPER::Insert($char);
}
}
}
my $mw = MainWindow->new;
my $var = "";
my $e = $mw->LimitEntry(-width => 8, -textvariable => \$var)->pack;
$mw->update;
$e->focus;
MainLoop;
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