Respected Monks,

Starting with MCE 1.828 and MCE::Shared 1.825, running MCE with Prima is possible. The following is based on the Tk + MCE::Hobo demonstration (2nd example in the post). I tested Prima + MCE on Linux using CentOS 7.x and Windows with Strawberry Perl 5.22.x.

use strict;
use warnings;

use MCE::Hobo;
use MCE::Shared;

use Prima qw( Application Buttons Label );

my $que  = MCE::Shared->queue();
my $msg  = MCE::Shared->scalar("Start");
my $hobo = MCE::Hobo->create("bg_task");

my $wm = Prima::MainWindow->new(
   size => [ 250, 200 ], text => 'Hello world!', onDestroy => \&quit
);

my $lbl1 = Prima::Label->create(
   owner => $wm, size => [ 220, 50 ], text => 'Prima + MCE Demo',
   alignment => ta::Center, valignment => ta::Middle,
   pack => {}
);

my $btn1 = Prima::Button->new(
   owner => $wm, size => [ 120, 50 ], text => $msg->get,
   onClick => \&fun,
   pack => {}
);

my $btn2 = Prima::Button->new(
   owner => $wm, size => [ 120, 50 ], text => 'Quit',
   onClick => sub { $::application->close },
   pack => {}
);

my $timer = Prima::Timer->create(
   timeout => 100, onTick => sub {
      my $new_text = $msg->get;
      if ($new_text ne $btn1->text) {
         $btn1->set( text => $msg->get );
      }
   }
);

$timer->start;

run Prima;

sub fun {
   $que->enqueue("some event");
   return;
}

sub quit {
   $timer->stop;
   $hobo->exit->join;
   $::application->close;
}

sub bg_task {
   while ( my $event = $que->dequeue ) {
      $msg->set("Step One");
      sleep 1;
      $msg->set("Step Two");
      sleep 1;
      $msg->set("Step Three");
   }
}
[download]

So that the quit function isn't called twice, I'm only calling $::application->close inside the Quit handler. That closes the window which then triggers the MainWindow's onDestroy handler.

Regards, Mario

Update: Updated the timer handler. Thanks zentara.

Update: On the Mac, mouse clicks between windows is greatly improved by setting an option in XQuartz -> Preferences -> Windows -> Click-through Inactive Windows. When enabled, clicking on an inactive window will cause that mouse click to pass through to that window in addition to activating it.

Update: To improve performance on the Mac, set XQuartz -> Preferences -> Output -> Colors to Thousands. Then relaunch XQuartz for the option to take effect. Prima for the most part runs very well. Thank you, Dmitry.