The Expandable Category acts like a dropdown with custom content. Any Tagged User Widget - Base Class of all Editor Controls is grouped into some of them. It can be expanded/collapsed on runtime by clicking on the header. If there is any control nested in them with “CanBeRandomized” set to true, the expansion can only happen on the right half of the header, while the left half of the header is reserved for a randomize button.
The randomize functionality can be nested between level 0 and 1. E.g., the face controls have several level 1 categories with separate randomize buttons and one level 0 randomize button that controls all subcategories.
- Header sets the header text in caps.
- Level defines either Level 0 or Level 1, which alters the styling.
- Expanded defines the default expansion state and is set on runtime.
- Top Padding defines the pixel spacing above the header.
- Bottom Padding when Expanded defines pixel spacing below the content when expanded.
The expansion state is a bit tricky in the UMG editor, thus sometimes you need to recompile the widget hosting an Expandable Category. Especially, if the categories are nested within other categories or scroll boxes.