use Tk;
use Tk::JPEG;
use File::Glob ':glob';

my $automode = 0;

my @jpgs = bsd_glob("9???.jpg");
my $index = -1;

my $mw = MainWindow->new(title => "JPEG");
$mw->geometry("800x800"); 
my $f = $mw->Frame()->pack(-fill => "both");
$f->Button(-text => "Load", -command => \&load)->pack(-side => "left", -fill => "both");
my $pattern = $f->Entry(-width => 10, -text => '*')->pack(-side => "left", -fill => "both");
my $step;
$f->Button(-text => "<<", -command => sub {prev_image($step->get())})->pack(-side => "left", -fill => "both");
$f->Button(-text => "<", -command => sub {prev_image(0)})->pack(-side => "left", -fill => "both");
$step = $f->Entry(-width => 3, -text => 10)->pack(-side => "left", -fill => "both");
$f->Button(-text => ">", -command => sub {next_image(0)})->pack(-side => "left", -fill => "both");
$f->Button(-text => ">>", -command => sub {next_image($step->get())})->pack(-side => "left", -fill => "both");
$f->Checkbutton(-text => "Auto Mode", -onvalue => 1, -offvalue => 0, -variable => \$automode, -command => sub {if ($automode) {print $automode; next_image()}})->pack(-side => "left", -fill => "both");
$f->Label(-text => "Delay")->pack(-side => "left", -fill => "both");
my $delay = $f->Entry(-width => 4, -text => 1000)->pack(-side => "left", -fill => "both");
$f->Label(-text => "milli-second(s)")->pack(-side => "left", -fill => "both");
my $image = $mw->Photo();
next_image(0);
my $button = $mw->Label(-image => $image)->pack(-side => "top", -fill => "both");

MainLoop;

sub load {
	@jpgs = bsd_glob($pattern->get());
	$index = -1;
	next_image(0);
}

sub next_image {
	$index += shift;
	$index = $#jpgs if ($index > $#jpgs);
	while ((($index + 1)<= $#jpgs) && !eval {$image->read($jpgs[++ $index], -shrink); 1}) {
	}
	if ($automode) {
		$mw->after($delay->get(), \&next_image) if (($index + 1) <= $#jpgs);
	}
	$mw->configure(-title => $jpgs[$index]);
	$std = undef;
}

sub prev_image {
	$index -= shift;
	$index = 0 if ($index < 0);
	$automode = 0;
	while ((($index - 1) >= 0) && !eval {$image->read($jpgs[-- $index], -shrink); 1}) {
	}
	if ($index >= 0) {
		$mw->configure(-title => $jpgs[$index]);
		$std = undef;
	} 
}