EventManager

gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Events
{
    class EventManager
    {
        private static EventManager instance = null;
        public static EventManager Instance
        {
            get
            {
                if (instance == null)
                    instance = new EventManager();
                return instance;
            }
        }

        private EventManager()
        {
        }

        private Dictionary<Type, MulticastDelegate> listeners = new Dictionary<Type, MulticastDelegate>();

        public void SendEvent<T>(T eventData)
        {
            MulticastDelegate d;
            if (listeners.TryGetValue(typeof(T), out d))
            {
                System.Action<T> e = (System.Action<T>)d;
                e(eventData);
            }
        }

        public void RegisterListener<T>(System.Action<T> listener)
        {
            MulticastDelegate d;
            if (listeners.TryGetValue(typeof(T), out d))
            {
                var e = (System.Action<T>)d;
                e += listener;
                listeners[typeof(T)] = e;
            }
            else
            {
                listeners[typeof(T)] = listener;
            }
        }

        public void RemoveListener<T>(System.Action<T> listener)
        {
            MulticastDelegate d;
            if (listeners.TryGetValue(typeof(T), out d))
            {
                var e = (System.Action<T>)d;
                e -= listener;
                listeners[typeof(T)] = e;
            }
        }

        public void Clear()
        {
            listeners.Clear();
        }
    }
}