2 * Expose the _EventTarget class.
4 module.exports = _EventTarget;
6 function _EventTarget() {
7 // Do nothing if called for a native EventTarget object..
8 if (typeof this.addEventListener === 'function') {
14 this.addEventListener = _addEventListener;
15 this.removeEventListener = _removeEventListener;
16 this.dispatchEvent = _dispatchEvent;
19 Object.defineProperties(_EventTarget.prototype, {
22 return this._listeners;
27 function _addEventListener(type, newListener) {
32 if (!type || !newListener) {
36 listenersType = this._listeners[type];
37 if (listenersType === undefined) {
38 this._listeners[type] = listenersType = [];
41 for (i = 0; !!(listener = listenersType[i]); i++) {
42 if (listener === newListener) {
47 listenersType.push(newListener);
50 function _removeEventListener(type, oldListener) {
55 if (!type || !oldListener) {
59 listenersType = this._listeners[type];
60 if (listenersType === undefined) {
64 for (i = 0; !!(listener = listenersType[i]); i++) {
65 if (listener === oldListener) {
66 listenersType.splice(i, 1);
71 if (listenersType.length === 0) {
72 delete this._listeners[type];
76 function _dispatchEvent(event) {
81 stopImmediatePropagation = false,
84 if (!event || typeof event.type !== 'string') {
85 throw new Error('`event` must have a valid `type` property');
88 // Do some stuff to emulate DOM Event behavior (just if this is not a
92 event.cancelable = true;
95 // Attempt to override the stopImmediatePropagation() method
97 event.stopImmediatePropagation = function () {
98 stopImmediatePropagation = true;
103 listenersType = (this._listeners[type] || []);
105 dummyListener = this['on' + type];
106 if (typeof dummyListener === 'function') {
107 dummyListener.call(this, event);
110 for (i = 0; !!(listener = listenersType[i]); i++) {
111 if (stopImmediatePropagation) {
115 listener.call(this, event);
118 return !event.defaultPrevented;