# http://poe.perl.org/?POE_Cookbook/Tk_Interfaces
#
# This sample program creates a very simple Tk counter.  Its interface
# consists of three widgets: A rapidly increasing counter, and a
# button to reset that counter.

use warnings;
use strict;

# Tk support is enabled if the Tk module is used before POE itself.

use Tk;
use POE;

# Create the session that will drive the user interface.

POE::Session->create
  ( inline_states =>
      { _start => \&ui_start,
        ev_count => \&ui_count,
        ev_clear => \&ui_clear,
      }
  );

# Run the program until it is exited.

$poe_kernel->run();
exit 0;

sub ui_start {
    my ( $kernel, $session, $heap ) = @_[ KERNEL, SESSION, HEAP ];

    if(! defined($poe_main_window)) { die "\$poe_main_window not defined" };

    $poe_main_window->Label( -text => "Counter" )->pack;

    $heap->{counter_widget} =
      $poe_main_window->Label( -textvariable => \$heap->{counter} )->pack;

    $poe_main_window->Button
      ( -text => "Clear",
        -command => $session->postback("ev_clear")
      )->pack;

    $poe_main_window->update;
    $kernel->yield("ev_count");
}

# Handle the "ev_count" event by increasing a counter and displaying
# its new value.

sub ui_count {
    $_[HEAP]->{counter}++;
    $poe_main_window->update;
    sleep(1);
    $_[KERNEL]->yield("ev_count");
}

# Handle the "ev_clear" event by clearing and redisplaying the
# counter.

sub ui_clear {
    $_[HEAP]->{counter} = 0;
}

##</code><code>##

perlapp --add "POE::Wheel" --add "POE::Loop::Tk" --add "POE::Loop::Select" --add "POE::Resource::Aliases" --add "POE::Resource::Events" --add "POE::Resource::Extrefs" --add "POE::Resource::FileHandles" --add "POE::Resource::SIDs" --add "POE::Resource::Sessions" --add "POE::Resource::Signals" --add "POE::Resource::Statistics" --add "POE::Session" --add "POE::Driver::SysRW" --add "POE::Filter::Line" --verbose --clean --force --lib lib --exe tst121.exe tst121.pl

##</code><code>##

# WHY DO I HAVE TO DO THIS????
 my $top = $poe_main_window || MainWindow->new();