public static void AddHandler(IDoubleActionProvider provider, DoubleActionEventHandler handler)
 {
     DoubleActionDispatcher dispatcher;
     if (map.ContainsKey(provider))
     {
         dispatcher = map[provider];
     }
     else
     {
         dispatcher = new DoubleActionDispatcher(provider);
         map.Add(provider, dispatcher);
     }
     dispatcher.DoubleActionEvent += handler;
 }
        public static void RemoveHandler(IDoubleActionProvider provider, DoubleActionEventHandler handler)
        {
            if (!map.ContainsKey(provider))
            {
                return;
            }

            DoubleActionDispatcher dispatcher = map[provider];
            dispatcher.DoubleActionEvent -= handler;
            if (dispatcher.DoubleActionEvent.GetInvocationList().Length == 0)
            {
                dispatcher.Release();
                map.Remove(provider);
            }
        }
 /// <summary>
 /// Initializes a new instance of the <see cref="ActionDispatcher"/> class.
 /// </summary>
 /// <param name="provider">The provider.</param>
 protected DoubleActionDispatcher(IDoubleActionProvider provider)
     : base(provider)
 {
     provider.DoubleAction = ObjectiveCRuntime.Selector("doDoubleAction:");
 }