示例#1
0
        /// <summary>
        /// Gets the existing <see cref="InterfaceEventListener"/> for the given <see cref="Action"/>.
        /// </summary>
        /// <param name="dispatcher"></param>
        /// <param name="eventType"></param>
        /// <param name="capture"></param>
        /// <param name="action"></param>
        /// <returns></returns>
        public static InterfaceEventListener GetListener(EventTarget dispatcher, string eventType, bool capture, Action<Event> action)
        {
            Contract.Requires<ArgumentNullException>(dispatcher != null);
            Contract.Requires<ArgumentNullException>(!string.IsNullOrWhiteSpace(eventType));
            Contract.Requires<ArgumentNullException>(action != null);
            Contract.Requires<ArgumentException>(action.Target != null, "Action must have target.");
            Contract.Requires<ArgumentException>(action.Method != null, "Action must have method.");
            Contract.Requires<ArgumentException>(action.Target is ElementExtension, "Action.Target must be a ElementExtension.");
            Contract.Requires<ArgumentException>(IsValidMethodInfo(action.Method));

            var handler = action.Target;
            var method = action.Method;

            return GetListener(dispatcher, eventType, capture, ((ElementExtension)handler).Element, handler.GetType(), method);
        }
示例#2
0
        /// <summary>
        /// Gets the existing <see cref="InterfaceEventListener"/> registered on the target.
        /// </summary>
        /// <param name="dispatcher"></param>
        /// <param name="eventType"></param>
        /// <param name="capture"></param>
        /// <param name="handler"></param>
        /// <param name="interfaceType"></param>
        /// <param name="methodInfo"></param>
        /// <returns></returns>
        public static InterfaceEventListener GetListener(EventTarget dispatcher, string eventType, bool capture, XObject handler, Type interfaceType, MethodInfo methodInfo)
        {
            Contract.Requires<ArgumentNullException>(dispatcher != null);
            Contract.Requires<ArgumentNullException>(!string.IsNullOrWhiteSpace(eventType));
            Contract.Requires<ArgumentNullException>(handler != null);
            Contract.Requires<ArgumentNullException>(interfaceType != null);
            Contract.Requires<ArgumentNullException>(methodInfo != null);
            Contract.Requires<ArgumentException>(IsValidMethodInfo(methodInfo));

            var host = handler.Exports().GetExportedValue<Func<Document>>()();
            if (host == null)
                throw new InvalidOperationException();

            // find existing listener
            var listener = Enumerable.Empty<EventListenerRegistration>()
                .Concat(dispatcher.GetRegistrations())
                .OfType<InterfaceEventListener>()
                .Where(i => i.GetHandler(host) == handler)
                .Where(i => i.InterfaceType == interfaceType)
                .FirstOrDefault();

            return listener;
        }