efl/src/lib/elementary/efl_ui_progressbar_part.eo

class Efl.Ui.Progressbar.Part (Efl.Ui.Layout.Part, Efl.Ui.Range)
{
   [[Elementary progressbar internal part class]]
   data: null;
   implements {
      Efl.Container.content { set; }
      Efl.Ui.Range.range_value { set; get; }
   }
}