#!/usr/bin/perl -w
use strict;
use Tk;

my $mw = MainWindow->new();

my $canv = $mw->Canvas(-bg => 'lightsteelblue',
     -relief => 'sunken',
     -width => 500,
     -height => 400)->pack(-expand => 1, -fill => 'both');

my $xtermWidth = 400;
my $xtermHeight = 300;

## this Frame is needed for including the xterm in Tk::Zinc 
my $xtermContainer = $canv->Frame(-container => 1);
my $xtid = $xtermContainer->id();
print "$xtid\n";

# converting the id from HEX to decimal as xterm requires a decimal Id 
my ($xtId) = sprintf hex $xtid;
print "$xtId\n";

my $label = $canv->createText( 250,10,
       -text => "Hide xterm",
       );


my $dcontitem = $canv->createWindow(250,175,
   -window => $xtermContainer,
   -width => $xtermWidth+4,
   -height => $xtermHeight+4,
   -state => 'normal');


$canv->bind($label, '<1>', \&hideShow);

sub hideShow {
    if ($canv->itemcget($label, -text) =~ /Hide/) {
          $canv->itemconfigure($label,
                    -fill => 'yellow',
                    -text => "Show xterm");
       $canv->itemconfigure($dcontitem, -state => 'hidden');
    } else {
         $canv->itemconfigure($label,
                    -fill => 'black',
                    -text => "Hide xterm");
       $canv->itemconfigure($dcontitem, -state => 'normal');
    }
    }

    my $width = $xtermWidth/10;
    my $height = $xtermHeight/20;

$mw->Button(-text => "Toplevel", -command => \&do_Toplevel)->pack(  );

system("xterm -fn 10x20 -geometry ${width}x${height} -into $xtId &");

MainLoop();


sub do_Toplevel {

   my $tl = $mw->Toplevel(-use=>$xtId );
    $tl->title("Toplevel");
    $tl->Button(-text => "Close",
                -command => sub { $tl->withdraw })->pack;
}
__END__