sg-event-emitter/lib/EventEmitter.js

Simple service registry

'use strict';

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var PublicEventEmitter = function () {
    function PublicEventEmitter() {
        _classCallCheck(this, PublicEventEmitter);

        this.listeners = {};
    }

    _createClass(PublicEventEmitter, [{
        key: 'addEventListener',
        value: function addEventListener(name, listener) {
            if (!this.listeners[name]) {
                this.listeners[name] = [];
            }
            this.listeners[name].push(listener);
        }
    }, {
        key: 'removeEventListener',
        value: function removeEventListener(name, listener) {
            var listenerIndex = this.listeners[name].indexOf(listener);

            this.listeners[name].splice(listenerIndex, 1);
        }
    }]);

    return PublicEventEmitter;
}();

var EventEmitter = function (_PublicEventEmitter) {
    _inherits(EventEmitter, _PublicEventEmitter);

    function EventEmitter() {
        _classCallCheck(this, EventEmitter);

        return _possibleConstructorReturn(this, Object.getPrototypeOf(EventEmitter).call(this));
    }

    _createClass(EventEmitter, [{
        key: 'dispatchEvent',
        value: function dispatchEvent(name) {
            var additionalData = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];

            if (this.listeners[name]) {
                this.listeners[name].forEach(function (listener) {
                    listener(additionalData);
                });
            }
        }
    }, {
        key: 'settle',
        value: function settle(host) {
            host.addEventListener = this.addEventListener.bind(this);
            host.removeEventListener = this.removeEventListener.bind(this);
        }
    }]);

    return EventEmitter;
}(PublicEventEmitter);

module.exports = {
    PublicEventEmitter: PublicEventEmitter,
    EventEmitter: EventEmitter
};