#!/usr/bin/perl
use Tk;

#also check out the Pane widget.

use Tk::Frame;
use Tk::Canvas;
use Tk::Button;

my $mw = new MainWindow;
my $sc = $mw->Scrolled(
    'Canvas',
    -bg => 'black',
    -scrollbars => 'w',
);

my $sf = $sc->Frame( -background => 'Yellow' );

foreach ( 1 .. 100 ) {
    my $subframe = $sf->Frame();
    my $lbl      =
      $subframe->Label( -text => "Entry $_" )
      ->pack( -side => 'left', -fill => 'x' );
    my $txt = $subframe->Entry()->pack( -side => 'right', -fill => 'x' );
    $subframe->pack( -side => 'top', -fill => 'x' );
}

# Find the required width / height of our frame...

$sf->update;    # forces geometry requests to propagate
my $f_req_w = $sf->reqwidth;
my $f_req_h = $sf->reqheight;

print "- Frame needs $f_req_w by $f_req_h\n";

# Configure the scrolled canvas for a best fit...

$sc->configure(
    -scrollregion => [ 0, 0, $f_req_w, $f_req_h ],
    -width        => $f_req_w
);

$sc->createWindow(
    0, 0,
    -anchor => 'nw',
    -window => $sf,
    -height => $f_req_h,
    -width  => $f_req_w,
);

$sc->pack( -expand => 1, -fill => 'both' );

Tk::MainLoop;
__END__

##</code><code>##

#!/usr/bin/perl
use warnings;
use strict;
use Tk;

my $list;
my $parent;

my $mw = MainWindow->new();
$mw->title("Listbox");
$mw->geometry("600x300+100+100");

$mw->Button(
    -text    => "Exit",
    -command => sub { exit }
)->pack( -side => 'bottom', -fill => 'x' );

$parent = $mw->Listbox()->pack( -side => 'left', -fill => 'y', -expand => 1 );

my $yscroll = $parent->Scrollbar(-orient => 'vertical');

my $listboxes = [
    $parent->Listbox(), $parent->Listbox(),
    $parent->Listbox(), $parent->Listbox(),
    ];


foreach $list (@$listboxes) {
    $list->configure(
         -yscrollcommand => [ \&scroll_listboxes, $yscroll, $list, $listboxes ],
    );
}


$yscroll->configure(
    -command => sub {
        foreach $list (@$listboxes) {
            $list->yview(@_);
        }
    }
);


$yscroll->pack( -side => 'left', -fill => 'y' );


my $count = 0;
foreach $list (@$listboxes) {
    $list->insert(
        'end',     "one-$count",       "two-$count",      "three-$count",
        "four-$count",    "five-$count",      "six-$count",      "seven-$count",
        "eight-$count",   "nine-$count",      "ten-$count",      "eleven-$count",
        "twelve-$count",  "thirteen-$count",  "fourteen-$count", "fifteen-$count",
        "sixteen-$count", "seventeen-$count", "eighteen-$count", "nineteen-$count",
        "twenty-$count"
    );
$count++;

    $list->pack( -side => 'left', -fill => 'y', -expand => 1 );
}


MainLoop;

sub scroll_listboxes {
    my ( $sb, $scrolled, $lbs, @args ) = @_;
    $sb->set(@args);
    my ( $top, $bottom ) = $scrolled->yview();
    foreach $list (@$lbs) {
        $list->yviewMoveto($top);
    }
}
__END__