Gtk2 X11 GrabKey

[basiliscos]

Hello! I need to show my Gtk2 application, when some "global" hotkey is been pressed. I tried to do that way, but it doesn't work:

#!/usr/bin/env perl

use 5.12.0;
use strict;
use warnings;

use AnyEvent;
use Carp;
use Devel::Comments;
use Gtk2 -init;
use X11::Protocol;
use X11::Keyboard;

my $window = Gtk2::Window->new ('toplevel');
my $button = Gtk2::Button->new ('Quit');
$button->signal_connect (clicked => sub { Gtk2->main_quit });


$window->add ($button);

$window->show_all;

my $x = X11::Protocol->new;
my $k = X11::Keyboard->new($x);
my $mask = $x->pack_event_mask('KeyPress');
$x->ChangeWindowAttributes($x->root, event_mask => $mask);
$x->event_handler(sub { say "z"; });

my $seq = $x->GrabKey($k->KeysymToKeycode("z"),
                      'AnyModifier', $x->root, 1, 'Asynchronous', 'Asy
+nchronous');

Gtk2->main;

I need to get the global key press asynchronously; when I fetch them directly/synchronously, than it works:

$x->event_handler ('queue');
my %event = $x->next_event;

The problem with the last piece of code, that it blocks all my GUI. The guys in Internet offered an solution to use separate pthread in such a blocking manner, but it's OK for C, and not OK for perl. Thanks a lot for any suggestions!