#!/usr/local/bin/perl -w
use strict;
use Tk;
my $mw = MainWindow->new;
my $pick = $mw->Label(-text => 'Pick', -relief => 'raised')->pack;
$mw->Button(-text => 'Quit', -command => [destroy => $mw])->pack;
$pick->bind('<1>', \&PickStart);
$pick->bind('<ButtonRelease-1>', [\&PickWin,Ev('X'),Ev('Y')]);
MainLoop;
sub PickStart
{
 my $w = shift;
 $w->grabGlobal;
 $w->configure(-cursor => 'hand2', -relief => 'sunken');
}
sub PickWin
{
 my ($w,$x,$y) = @_;
 $w->grabRelease;
 $w->configure(-cursor => undef, -relief => 'raised');
 my $id = $w->PointToWindow($x,$y);
 my $depth = 0;
 while ($id)
  {
   my @props = $w->property(list => $id);
   printf("%s%08X %s\n",' ' x $depth,$id,join(' ',@props));
   $depth++;
   $id = $w->PointToWindow($x,$y,$id);
  }
}