code: public void onBrowserEvent(Context context, Element elem, final T object, NativeEvent event) {
          final int index = context.getIndex();
          ValueUpdater<C> valueUpdater = (fieldUpdater == null) ? null : (ValueUpdater<C>) value -> {
              fieldUpdater.update(index, object, value);
          };
          cell.onBrowserEvent(context, elem, getValue(object), event, valueUpdater);
      }
docs: Handle a browser event that took place within the column.
  
  @param context the cell context
  @param elem the parent Element
  @param object the base object to be updated
  @param event the native browser event