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/**
* EvEmitter v1.0.1
* Lil' event emitter
* MIT License
*/
/* jshint unused: true, undef: true, strict: true */
( function( global, factory ) {
// universal module definition
/* jshint strict: false */ /* globals define, module */
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();
}
}( 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 array
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;
}));
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