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66 lines
1.7 KiB
66 lines
1.7 KiB
var Class = require('./Class');
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var has = require('./has');
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var each = require('./each');
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var slice = require('./slice');
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var once = require('./once');
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exports = Class(
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{
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initialize: function Emitter() {
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this._events = this._events || {};
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},
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on: function(event, listener) {
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this._events[event] = this._events[event] || [];
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this._events[event].push(listener);
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return this;
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},
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off: function(event, listener) {
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var events = this._events;
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if (!has(events, event)) return;
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var idx = events[event].indexOf(listener);
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if (idx > -1) {
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events[event].splice(idx, 1);
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}
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return this;
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},
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once: function(event, listener) {
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this.on(event, once(listener));
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return this;
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},
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emit: function(event) {
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if (!has(this._events, event)) return;
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var args = slice(arguments, 1);
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each(
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this._events[event],
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function(val) {
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val.apply(this, args);
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},
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this
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);
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return this;
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},
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removeAllListeners: function(event) {
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if (!event) {
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this._events = {};
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} else {
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delete this._events[event];
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}
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return this;
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}
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},
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{
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mixin: function(obj) {
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each(['on', 'off', 'once', 'emit'], function(val) {
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obj[val] = exports.prototype[val];
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});
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obj._events = obj._events || {};
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}
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}
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);
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module.exports = exports;
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