#!/usr/local/bin/perl

use strict;
use warnings;
use Tk;
use Tk::EntryCheck;

my $entry_val;

my $mw = MainWindow->new;
$mw->geometry("500x200");
$mw->title("Value Entry");

my $mf = $mw->Frame()->pack(-side => 'top', -fill => 'x');
my $tf = $mf->Frame(-background => "red")->pack(-side => 'top',
                                         -fill =>'x');
my $lf = $mf->Frame(-background => "black")->pack(-side => 'left',
                                         -fill => 'y');
my $rf = $mf->Frame(-background => "white")->pack(-side => "right");
$tf->Label(-text => "Value Entry",
           -background => "red")->pack(-side =>"top");
$lf->Label(-text => "Enter value:", -background => "black",
           -foreground => "yellow")->pack(-side => "left");

my $entry = $lf->EntryCheck( -validate => "all"
)->pack(-side => "left");

my $copy_button = $lf->Button(-text => "Copy Value",
           -command => \&copy_values)->pack(-side => "right");
my $clear_entries = $rf->Button(-text => "Clear Value",
           -command => \&clear_entries)->pack(-side => "top");
my $paste_entries = $rf->Text(-background => "black",
           -foreground => "green")->pack(-side => "top");

sub handleEvent {
   my ($new_val, $chars_2_change, $curr_val, $index, $action) = @_;
   if (!$chars_2_change && $action != -1) {
      return;
   }
   print $new_val."\n";
}

sub clear_entries {
    $paste_entries->delete('0.0', 'end');
}

sub copy_values {
    my $copied_text = $entry->get();
    $paste_entries->insert("end", $copied_text);
}

MainLoop;