#!/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' ,'background' );
	    })->pack();

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


my $rect = $canvas->createRectangle(0,0,500, 500, 
                 -fill => 'orange',
                 -tags => ['background'],
                 ); 


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


my $window = $canvas->Checkbutton(-text=> 'Foo');
my $win = $canvas->createWindow(20,20,
          -window=> $window,
          );

$canvas->move($win,-1000,-1000);  #dx, dy

$mw->Button(-text=>"Show Checkbox",
            -command => sub{
         $canvas->move($win, 1000,1000 );
	    })->pack();


$mw->Button(-text=>"Hide Checkbox",
            -command => sub{
         $canvas->move($win, -1000,-1000 );
	    })->pack();


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

MainLoop;


sub get_bunny{

return  
'iVBORw0KGgoAAAANSUhEUgAAAB4AAAAjEAIAAABcJvHFAAAACXBIWXMAAAsSAAALEgHS3X78AAAD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';
}