code: public function addListener($name, $listener, $priority = 0)
  	{
  		if (is_string($listener) && !is_callable($listener)) {
  			$listener = [$listener, 'handle'];
  		}
  
  		if (is_array($listener) && is_string($listener[0])) {
  			list($class, $method) = $listener;
  			$listener = function($event) use($class, $method) {
  				return $this->resolver->resolve($class)
  					->$method($event);
  			};
  		}
  
  		parent::addListener($name, $listener, $priority);
  	}
docs: {@inheritdoc}
  
  The listener can be a string of 'Class:method' or just 'Class'. If no
  method is provided, the method 'handle' is used.