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

# Idea ripped from a script by Christophe Mertz of the 
# Tk::Zinc module, to work with a plain canvas. 
# The Zinc module has much more flexibility in how 
# you can hide windows. I had to mask the xterm with a 
# toplevel to hide it in the plain old canvas. 
#  

my $mw = MainWindow->new();

my $canv = $mw->Canvas(-bg => 'lightsteelblue',
     -relief => 'sunken',
     -width => 550,
     -height => 350)->pack(-expand => 1, -fill => 'both');

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

## this Frame is needed for including the xterm in Tk::Canvas 
my $xtermContainer = $canv->Frame(-container => 1);
my $xtid = $xtermContainer->id();
# converting the id from HEX to decimal as xterm requires a decimal Id
+ 
my ($xtId) = sprintf hex $xtid;

my $dcontitem = $canv->createWindow(275,175,
   -window => $xtermContainer,
   -width => $xtermWidth+100,
   -height => $xtermHeight,
   -state => 'normal');

my $label = $canv->createText( 275,10,
       -text => "Hide xterm",
       );

$canv->Tk::bind("<Button-1>", \&hideShow);

my $width = $xtermWidth;
my $height = $xtermHeight;

$mw->Button(-text => "Exit", -command => [sub{Tk::exit}] )->pack(  );

my $tl; #used to mask xterm 
system("xterm -into $xtId &");

MainLoop();

sub hideShow {
    if ($canv->itemcget($label, -text) =~ /Hide/) {
             $canv->itemconfigure($label,
                    -fill => 'white',
                    -text => "Show xterm");

             $tl = $mw->Toplevel(-use=>$xtId );
           } else {
             $canv->itemconfigure($label,
                    -fill => 'black',
                    -text => "Hide xterm");
             $tl->withdraw;
        }
}
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