code: function(oEvent){
  		var iCurrentX = oEvent.pageX;
  		var iDiff = this._bRTL ? (this._iStartDragX - iCurrentX) : (iCurrentX - this._iStartDragX);
  		setWidth(this, this._iStartWidth + iDiff);
  	}
docs: Handles the MouseMove event during resizing @see sap.ui.ux3.ExactList.prototype.onmousedown