code: @Api
  	public Set<Listener> getListeners() {
  		Set<ListenerController> controllers = graphics.getListeners();
  		Set<Listener> listeners = new LinkedHashSet<Listener>();
  		for (ListenerController controller : controllers) {
  			listeners.add(controller.getListener());
  		}
  		return listeners;
  	}
docs: Get the currently active set of listeners on the map. These listeners passively listen to mouse events on the
  map, without actually interfering with these events. The difference with a {@link GraphicsController} is that
  controllers can do whatever they want, while a listener is not allowed to interfere with the mouse events in any
  way.
  
  @return Returns the full set of currently active listeners.
  @since 1.8.0