Light12306/Web12306/js/platform/EventObject.js

define(function () {
	function EventObject() {
		var that = this;

		var handles = {};

		this.on = function (name, callback, once) {
			var handleQueue = handles[name] || [];
			handles[name] = handleQueue;
			handleQueue.push(callback);

			return this;
		};

		this.off = function (name, callback) {
			var handleQueue = handles[name] || [];
			if (callback) {
				for (var i = handleQueue.length - 1; i >= 0; i--) {
					if (handleQueue[i] === callback || (handleQueue[i].hasOwnProperty("__rawFn") && handleQueue[i].__rawFn === callback)) {
						if (handleQueue[i].hasOwnProperty("__rawFn"))
							delete handleQueue[i].__rawFn;

						handleQueue.splice(i, 1);
					}
				}
			} else {
				handleQueue.length = 0;
			}
			handles[name] = handleQueue;

			return this;
		};

		this.fireEvent = function (type) {
			var ev = typeof (type) === "string" ? new CustomEvent(type) : type.type;
			ev.target = ev.target || this;
			ev.data = arguments[1] || null;

			var handleQueue = handles[type];
			if (!handleQueue) return;

			var args = [].slice.call(arguments, 1);
			args.unshift(ev);
			handleQueue = handleQueue.slice();

			for (var i in handleQueue) {
				var handle = handleQueue[i];
				if (!handle) continue;

				if (handle.apply(this, args) === false) {
					ev.defaultPrevented = true;
					break;
				}
			}

			return !ev.defaultPrevented;
		};
		this.once = function (name, fn) {
			var ptr = Function.prototype.apply.bind(fn.bind(this));
			var nCallback = function () {
				delete nCallback.__rawFn;
				that.off(name, fn);
				return ptr([].slice.call(arguments));
			};
			nCallback.__rawFn = fn;
			that.on(name, nCallback);
		};
		this.addEventListener = this.on;
		this.removeEventListener = this.off;
		this.dispatchEvent = this.fireEvent;


		return this;
	}

	return EventObject;
});