code: public void addPrimaryListener(InputListener listener) {
  		removeListener(listener);
  		
  		keyListeners.add(0, listener);
  		mouseListeners.add(0, listener);
  		controllerListeners.add(0, listener);
  		
  		allListeners.add(listener);
  	}
docs: Add a listener to be notified of input events. This listener
  will get events before others that are currently registered
  
  @param listener The listener to be notified