97 lines
1.5 KiB
JavaScript
97 lines
1.5 KiB
JavaScript
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/**
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* @author mrdoob / http://mrdoob.com/
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*/
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var EventDispatcher = function () {};
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Object.assign( EventDispatcher.prototype, {
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addEventListener: function ( type, listener ) {
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if ( this._listeners === undefined ) this._listeners = {};
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var listeners = this._listeners;
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if ( listeners[ type ] === undefined ) {
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listeners[ type ] = [];
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}
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if ( listeners[ type ].indexOf( listener ) === - 1 ) {
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listeners[ type ].push( listener );
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}
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},
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hasEventListener: function ( type, listener ) {
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if ( this._listeners === undefined ) return false;
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var listeners = this._listeners;
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if ( listeners[ type ] !== undefined && listeners[ type ].indexOf( listener ) !== - 1 ) {
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return true;
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}
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return false;
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},
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removeEventListener: function ( type, listener ) {
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if ( this._listeners === undefined ) return;
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var listeners = this._listeners;
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var listenerArray = listeners[ type ];
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if ( listenerArray !== undefined ) {
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var index = listenerArray.indexOf( listener );
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if ( index !== - 1 ) {
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listenerArray.splice( index, 1 );
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}
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}
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},
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dispatchEvent: function ( event ) {
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if ( this._listeners === undefined ) return;
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var listeners = this._listeners;
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var listenerArray = listeners[ event.type ];
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if ( listenerArray !== undefined ) {
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event.target = this;
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var array = [], i = 0;
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var length = listenerArray.length;
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for ( i = 0; i < length; i ++ ) {
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array[ i ] = listenerArray[ i ];
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}
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for ( i = 0; i < length; i ++ ) {
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array[ i ].call( this, event );
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}
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}
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}
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} );
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