#!/usr/bin/perl -w

# Strict
use strict;
use warnings;

# Libraries
use Tk;


# Main program
create_gui();


# Subroutines
sub create_gui {
    my $mw = new MainWindow(-title => 'Type "Escape" to exit...');
    $mw->bind('<Escape>' => sub { $mw->destroy() });
    my $frame = $mw->Frame(-background => 'blue');
    $frame->pack(-expand => 0, -fill => 'both');

    # Note:  288 = 256 + 16 + 16
    canvas($frame, 'hotpink', 'left',   16,   256 + 16 + 16);
    canvas($frame, 'gold',    'right',  16,   256 + 16 + 16);
    canvas($frame, 'maroon',  'top',    256,  16);
    canvas($frame, 'white',   'top',    256,  256);
    canvas($frame, 'purple',  'bottom', 256,  16);
    MainLoop;
}


sub canvas {
    my ($w, $background, $side, $width, $height) = @_;
    my $canvas = $w->Canvas(-background => $background);
    $canvas->configure(-width  => $width);
    $canvas->configure(-height => $height);
    $canvas->pack(-expand => 1, -fill => 'both', -side => $side);
    return $canvas;
}

#
#  Key:  H = Hotpink,  M = Maroon, P = Purple,  G = Gold,  . = White
#
#   The GUI I'm actually getting:     The GUI I'd *LIKE* to get:
#
#  +------------------------------+  +------------------------------+
#  |Tk Type "Escape" to exit..."  |  |Tk Type "Escape" to exit..."  |
#  +------------------------------+  +------------------------------+
#  |H  MMMMMMMMMMMMMMMMMMMMMMMM  G|  |HMMMMMMMMMMMMMMMMMMMMMMMMMMMMG|
#  |H                            G|  |H............................G|
#  |H  ........................  G|  |H............................G|
#  |H  ........................  G|  |H............................G|
#  |H  ........................  G|  |H............................G|
#  |H  ........................  G|  |H............................G|
#  |H  ........................  G|  |H............................G|
#  |H  ........................  G|  |H............................G|
#  |H  ........................  G|  |H............................G|
#  |H  ........................  G|  |H............................G|
#  |H                            G|  |H............................G|
#  |H  PPPPPPPPPPPPPPPPPPPPPPPP  G|  |HPPPPPPPPPPPPPPPPPPPPPPPPPPPPG|
#  +------------------------------+  +------------------------------+
#