/**
  * Handle the event.
  *
  * @param Container $container
  */
 public function handle(Container $container)
 {
     if ($this->builder->hasFormErrors()) {
         return;
     }
     $handler = $this->builder->getHandler();
     if ($handler && !str_contains($handler, '@')) {
         $handler .= '@handle';
     }
     $container->call($handler, ['builder' => $this->builder]);
 }