/** * EvEmitter v1.0.3 * Lil' event emitter * MIT License */ /* jshint unused: true, undef: true, strict: true */ ( function( global, factory ) { // universal module definition /* jshint strict: false */ /* globals define, module, window */ if ( typeof define == 'function' && define.amd ) { // AMD - RequireJS define( factory ); } else if ( typeof module == 'object' && module.exports ) { // CommonJS - Browserify, Webpack module.exports = factory(); } else { // Browser globals global.EvEmitter = factory(); } }( typeof window != 'undefined' ? window : this, function() { "use strict"; function EvEmitter() {} var proto = EvEmitter.prototype; proto.on = function( eventName, listener ) { if ( !eventName || !listener ) { return; } // set events hash var events = this._events = this._events || {}; // set listeners array var listeners = events[ eventName ] = events[ eventName ] || []; // only add once if ( listeners.indexOf( listener ) == -1 ) { listeners.push( listener ); } return this; }; proto.once = function( eventName, listener ) { if ( !eventName || !listener ) { return; } // add event this.on( eventName, listener ); // set once flag // set onceEvents hash var onceEvents = this._onceEvents = this._onceEvents || {}; // set onceListeners object var onceListeners = onceEvents[ eventName ] = onceEvents[ eventName ] || {}; // set flag onceListeners[ listener ] = true; return this; }; proto.off = function( eventName, listener ) { var listeners = this._events && this._events[ eventName ]; if ( !listeners || !listeners.length ) { return; } var index = listeners.indexOf( listener ); if ( index != -1 ) { listeners.splice( index, 1 ); } return this; }; proto.emitEvent = function( eventName, args ) { var listeners = this._events && this._events[ eventName ]; if ( !listeners || !listeners.length ) { return; } var i = 0; var listener = listeners[i]; args = args || []; // once stuff var onceListeners = this._onceEvents && this._onceEvents[ eventName ]; while ( listener ) { var isOnce = onceListeners && onceListeners[ listener ]; if ( isOnce ) { // remove listener // remove before trigger to prevent recursion this.off( eventName, listener ); // unset once flag delete onceListeners[ listener ]; } // trigger listener listener.apply( this, args ); // get next listener i += isOnce ? 0 : 1; listener = listeners[i]; } return this; }; return EvEmitter; }));