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EventEmitter.js
111 lines (94 loc) · 2.56 KB
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EventEmitter.js
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var EventEmitter = new Function ();
EventEmitter.prototype.initEventEmitter = function () {
this._listeners = {};
};
EventEmitter.prototype.initEventEmitterType = function (type) {
if (!type) {
return;
}
this._listeners[type] = [];
};
EventEmitter.prototype.hasEventListener = function (type, fn) {
if (!this.listener) {
return false;
}
if (type && !this.listener[type]) {
return false;
}
return true;
};
EventEmitter.prototype.addListener = function (type, fn) {
if (!this._listeners) {
this.initEventEmitter();
}
if (!this._listeners[type]) {
this.initEventEmitterType(type);
}
this._listeners[type].push(fn);
this.emit('newListener', type, fn);
};
EventEmitter.prototype.on = EventEmitter.prototype.addListener;
EventEmitter.prototype.one = function (type, fn) {
fn._oneTimeListener = true;
this.addListener(type, fn);
};
EventEmitter.prototype.removeListener = function (type, fn) {
if (!this._listeners) {
return;
}
if (!this._listeners[type]) {
return;
}
if (isNaN(this._listeners[type].length)) {
return;
}
if (!type) {
this.initEventEmitter();
this.emit('removeListener', type, fn);
return;
}
if (!fn) {
this.initEventEmitterType(type);
this.emit('removeListener', type, fn);
return;
}
var self = this;
for (var i = 0; i < this._listeners[type].length; i++) {
(function (listener, index) {
if (listener === fn) {
self._listeners[type].splice(index, 1);
}
})(this._listeners[type][i], i);
}
this.emit('removeListener', type, fn);
};
EventEmitter.prototype.emit = function (type) {
if (!this._listeners) {
return;
}
if (!this._listeners[type]) {
return;
}
if (isNaN(this._listeners[type].length)) {
return;
}
var self = this,
args = [].slice.call(arguments, 1);
for (var i = 0; i < this._listeners[type].length; i++) {
(function (listener) {
listener.apply(self, args);
if (listener._oneTimeListener) {
self.removeListener(type, listener);
}
})(this._listeners[type][i]);
}
};
EventEmitter.prototype.listeners = function (type) {
if (!type) {
return undefined;
}
return this._listeners[type];
};
// jquery style alias
EventEmitter.prototype.trigger = EventEmitter.prototype.emit;
EventEmitter.prototype.off = EventEmitter.prototype.removeListener;