#!/usr/bin/perl
use strict; # https://perlmonks.org/?node_id=11118320
use warnings;
use Tk;
{ # for package
package Tk::ListBox3;
use List::Util qw( first );
use base qw/ Tk::Frame /; # Frame-based composite
Construct Tk::Widget 'ListBox3'; # install MyNewWidget in pTk namespac
+e
sub ClassInit # called once to initialize new class
{
my($class, $mw) = @_;
$class->SUPER::ClassInit($mw);
}
sub Populate # called to build each widget instance
{
my($self, $args) = @_;
$self->SUPER::Populate($args);
my $search = '';
my $frame = $self->Frame(
-borderwidth => 5, -relief => 'ridge',
)->pack(-fill=> 'both', -expand=> 1);
my $label = $frame->Label( -fg => 'blue', -font => 30,
)->pack(-fill => 'x');
my $lbox = $frame->Scrolled(Listbox => -scrollbars => 'se',
-height => 20,
-selectforeground => 'orange',
-selectbackground => 'steelblue4',
-exportselection => 0,
)->pack(-side => 'bottom', -fill => 'both', -expand=> 1);
my $entry = $frame->Entry(-textvariable => \$search,
-validate => 'key', -validatecommand => sub
{
my ($want) = @_;
length $want or return 1;
my @list = $lbox->get(0 , "end");
my $item = first { $list[$_] =~ /^\Q$want\E/ } 0 .. $#list;
defined $item or return 0;
$lbox->selectionClear( 0 , "end" );
$lbox->selectionSet($item);
$lbox->see($item);
1 # to allow
},
)->pack(-fill => 'x');
$self->ConfigSpecs( DEFAULT => [$lbox], text => [$label] );
$self->Delegates( Construct => $lbox, insert => $lbox );
}
} # end package
my @choices = sort qw /alpha beta charlie delta echo foxtrot hotel ind
+ia juliet
kilo lima motel nancy oscar papa quebec radio sierra tango uniform v
+ictor
whiskey xray yankee zulu oin gloin beorn gandalf elr ond eowyn/;
my $header_msg = "ENTER a KEY name: ";
my $mw = MainWindow->new;
$mw->geometry( '+900+250' );
$mw->title( 'Listbox' );
my $lb = $mw->ListBox3( -text => $header_msg,
)->pack(-fill => 'both', -expand => 1, -side => 'left');
$lb->insert( 'end', @choices );
my $lb2 = $mw->ListBox3( -text => $header_msg,
)->pack(-fill => 'both', -expand => 1, -side => 'left');
$lb2->insert( 'end', @choices );
MainLoop;
Demos two of them to show no interference.
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