[java] Implementing Custom Event Model

Sound simple to me,
you need your broadcaster to have three methods for each event. One to register listeners, one to remoeve a listener and one to fire events. You need a set of listeners for each event and an interface for each event.

--> for the broadcaster:

public void regAnEventListener(AnEventListener el){
anEventSet.add(el);
}

public void removeAnEventListener(AnEventListener el){
anEventSet.remove(el);
}

private void fireAnEvent(){
//Psudeo code, loop through the set and call the method defined in the appropriate interface for each registrant in turn.
}

Each class that wants to listen to events has to implement the appropriate interface and register with the broadcaster passing itself as a parameter. You can use the eventInterfaces to define exacly what information will be passed for each event.

I might be over simplifying things (this aint multithreaded etc), but it'll work.

[edited by - fractionMan on January 15, 2004 9:25:50 AM]

I have no idea of how you could create your own event, what I would do is that I would catch events caused my the system (MouseMotion, Mouse, Keyboard etc) and then in their implementing methods I would trigger maybe a Move event or whatever depending on certain contditions. So bacially

class Chess implements MouseListener {
  public EventDispatcher listener;
  // contructor and other methods

  public Chess(EventDispatcher plugin){
    listener=plugin;
  }

  public void mousePressed(MouseEvent evt){
    if (moving) {
      listener.moveEvent();
    }
  }
}

I have no idea how this is going to work out but u might wanna give it a try....