#!/usr/bin/perl 
use warnings;
use strict;
use Tk;
use Tk::JPEG;
use Tk::PNG;

#demonstrates need for subwidget method
#on Scrolled Canvas, to use lower or raise

my $mw = new MainWindow;

my $canvas  = $mw->Scrolled('Canvas', 
       -bg  => 'white',
       -xscrollincrement => 1,
       -yscrollincrement => 1,
       -confine => 1,
       -scrollbars => 'se',
       -width => 200,
       -height => 200,
       -closeenough =>3,
       -scrollregion => [ 0, 0, 500, 500 ], 
)->pack(qw/ -fill both -expand 1 -side top/);


my $realcanvas = $canvas->Subwidget('scrolled');

$mw->Button(-text=>"Raise Bunny",
            -command => sub{
     # $canvas->lower( 'bunny' ,'tux' ); # will cause error
     # need subwidget of the scrolled canvas

     $realcanvas->raise( 'bunny' ,'tux' );
	    })->pack();

$mw->Button(-text=>"Lower Bunny",
            -command => sub{
         $realcanvas->lower( 'bunny' ,'tux' );
	    })->pack();



my $tux = $mw->Photo(-file => 'tux.jpg' );

$canvas->createImage( 0, 0, -image => $tux, 
                            -anchor => 'nw',
			    -tags => ['tux'],
			     );

my $bunny = $mw->Photo(-file => 'bunny.jpg' );
$canvas->createImage( 40, 40, -image => $bunny, 
                            -anchor => 'nw',
			    -tags => ['bunny'],
			     );


my $lineseg = $canvas->createLine(
         1,1,200,200, 
         -fill => 'red',
         -tags => ['line']
     );

# $canvas->lower( 'bunny' ,'tux' ); # will cause error
# need subwidget
$realcanvas->lower( 'bunny' ,'tux' );

MainLoop;