If you don't feel like patching Tk ( probably somewhere here), you can check for the selection periodically using a timer:
#! /usr/bin/perl
use strict;
use warnings;
use Tk;
my $mw = 'MainWindow'->new;
my $lbox = $mw->Listbox->pack;
my @list = qw( a b c d e f );
$lbox->insert(end => @list);
$lbox->selectionSet(1);
my @selection;
$lbox->repeat(100, sub {
my @current = $lbox->curselection;
warn "Listbox changed!\n" if "@selection" ne "@current";
@selection = @current;
});
my $f = $mw->Frame->pack;
$f->Button(-text => 'Add',
-command => sub { $lbox->selectionSet(2) })->pack(-side =>
+'left');
$f->Button(-text => 'Clear',
-command => sub { $lbox->selectionClear(0, 'end') })->pack;
MainLoop();
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
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