How can I get the cell index (or dataIndex) of the cell that triggered this itemcontextmenu of a grid view?

Code:
  listeners: {
    itemcontextmenu: function (view, record, el, index, e, eOpts) {
        e.preventDefault();
        //how can I get the cell index (or dataIndex) of the cell that triggered this itemcontextmenu?
    }
   }