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<h1 class="file-heading">File: src/pixi/utils/EventTarget.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* https://github.com/mrdoob/eventtarget.js/
* THankS mr DOob!
*/
/**
* Adds event emitter functionality to a class
*
* @class EventTarget
* @example
* function MyEmitter() {
* PIXI.EventTarget.call(this); //mixes in event target stuff
* }
*
* var em = new MyEmitter();
* em.emit({ type: 'eventName', data: 'some data' });
*/
PIXI.EventTarget = function () {
/**
* Holds all the listeners
*
* @property listeners
* @type Object
*/
var listeners = {};
/**
* Adds a listener for a specific event
*
* @method addEventListener
* @param type {string} A string representing the event type to listen for.
* @param listener {function} The callback function that will be fired when the event occurs
*/
this.addEventListener = this.on = function ( type, listener ) {
if ( listeners[ type ] === undefined ) {
listeners[ type ] = [];
}
if ( listeners[ type ].indexOf( listener ) === - 1 ) {
listeners[ type ].unshift( listener );
}
};
/**
* Fires the event, ie pretends that the event has happened
*
* @method dispatchEvent
* @param event {Event} the event object
*/
this.dispatchEvent = this.emit = function ( event ) {
if ( !listeners[ event.type ] || !listeners[ event.type ].length ) {
return;
}
for(var i = listeners[ event.type ].length-1; i >= 0; i--) {
// for(var i = 0, l=listeners[ event.type ].length; i < l; i++) {
listeners[ event.type ][ i ]( event );
}
};
/**
* Removes the specified listener that was assigned to the specified event type
*
* @method removeEventListener
* @param type {string} A string representing the event type which will have its listener removed
* @param listener {function} The callback function that was be fired when the event occured
*/
this.removeEventListener = this.off = function ( type, listener ) {
if ( listeners[ type ] === undefined ) return;
var index = listeners[ type ].indexOf( listener );
if ( index !== - 1 ) {
listeners[ type ].splice( index, 1 );
}
};
/**
* Removes all the listeners that were active for the specified event type
*
* @method removeAllEventListeners
* @param type {string} A string representing the event type which will have all its listeners removed
*/
this.removeAllEventListeners = function( type ) {
var a = listeners[type];
if (a)
a.length = 0;
};
};
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