    /** * @private */Ext.define('Ext.fx.easing.Abstract', {     config: {        startTime: 0,        startValue: 0    },     isEasing: true,     isEnded: false,     constructor: function(config) {        this.initConfig(config);         return this;    },     applyStartTime: function(startTime) {        if (!startTime) {            startTime = Ext.Date.now();        }         return startTime;    },     updateStartTime: function(startTime) {        this.reset();    },     reset: function() {        this.isEnded = false;    },     getValue: Ext.emptyFn});