How to get all the ui component ‘s  default  theme file?​  I want  to know  component part  such as “elm.swallow.content”  at a particular style . 

 If I want to use index , I must  create a layout  and   elm_layout_theme_set(layout, “layout”, “application”, “fastscroll”);​  and then  elm_object_part_content_set(layout, “elm.swallow.fastscroll”, index);​  if I don’t know  “elm.swallow.fastscroll” part , the index  will not be showed . So how  to get component’t default theme  .edc file ?