how can I set up multiple listeners for one event?

Question

I want to set up multiple listeners for one event, and have found that using composite listener is the key.

Could anyone give me an example?

Answer 1

class CompositeListener implements OnEventListener {
   private List<OnEventListener> registeredListeners = new ArrayList<OnEventListener>();

   public void registerListener (OnEventListener listener) {
      registeredListeners.add(listener);
   }

   public void onEvent(Event e) {
      for(OnEventListener listener:registeredListeners) {
         listener.onEvent(e);
      }
   }
}

.....

CompositeListener composite = new CompositeListener();
composite.registerListener(listener1);
composite.registerListener(listener2);
component.setOnEventListener(composite);