51 lines
1.3 KiB
JavaScript
51 lines
1.3 KiB
JavaScript
//Copyright (c) 2010 Nicholas C. Zakas. All rights reserved.
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//MIT License
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function EventTarget(){
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this._listeners = {};
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}
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EventTarget.prototype = {
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constructor: EventTarget,
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addListener: function(type, listener){
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if (typeof this._listeners[type] == "undefined"){
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this._listeners[type] = [];
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}
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this._listeners[type].push(listener);
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},
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fire: function(event){
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if (typeof event == "string"){
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event = { type: event };
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}
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if (!event.target){
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event.target = this;
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}
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if (!event.type){ //falsy
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throw new Error("Event object missing 'type' property.");
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}
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if (this._listeners[event.type] instanceof Array){
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var listeners = this._listeners[event.type];
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for (var i=0, len=listeners.length; i < len; i++){
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listeners[i].call(this, event);
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}
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}
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},
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removeListener: function(type, listener){
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if (this._listeners[type] instanceof Array){
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var listeners = this._listeners[type];
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for (var i=0, len=listeners.length; i < len; i++){
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if (listeners[i] === listener){
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listeners.splice(i, 1);
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break;
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}
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}
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}
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}
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}; |