Refinements and Improvements - Pro Unity Game Development with C# - page 303

//------------------------------------
public class NotificationsManager : MonoBehaviour
{
//Define even types here...
public enum EVENT_TYPE {ON_ENEMYDESTROYED = 0, ON_LEVELRESTARTED = 1,
ON_POWERUPCOLLECTED = 2, ON_KEYPRESS=3};
//Collection of listeners
private List<IListener> Listeners = new List<IListener>();
//------------------------------------
//Function to add listener
public void AddListener(IListener lObject)
{
//Add listener to list
Listeners.Add(lObject);
}
//------------------------------------
void PostEvent(EVENT_TYPE EType = EVENT_TYPE.ON_ENEMYDESTROYED, int Param = 0)
{
//Notify all listeners
for(int i=0; i<Listeners.Count; i++)
Listeners[i].OnEventOccured(EType, Param);
}
//------------------------------------
void Update()
{
if(Input.anyKeyDown)
{
//Post key press event to all listeners
PostEvent(EVENT_TYPE.ON_KEYPRESS,0);
}
}
//------------------------------------
}
//------------------------------------
Listing 10-7. Listener.cs: Sample Listener Object
using UnityEngine;
using System.Collections;
public class Listener : MonoBehaviour, IListener
{
private NotificationsManager NM = null;
void Start()
{
//Get notifications manager
NM = GetComponent<NotificationsManager>();
//Add as listener
NM.AddListener(this);
}