Egui

StyledPart — a meta-only Widget stand-in for UI painted in place (menu rows, title-bar tab cards): code that calls ctx.interact / ui.interact directly with painter calls instead of living through Ui#add. Without a Widget instance the inspector records NO meta for those interacts — the widget is unpickable and shows nothing to edit.

A StyledPart carries exactly what the inspector needs (kind, style class, property declarations, label) plus public cascade readers so the site reads its keys through the SAME layers real widgets use (class rules + per-element inspector overrides — Widget#style_vars is protected, so the readers live here on the part itself):

part = TabPart.new(title) ctx.with_inspector_widget(part) { ctx.interact(id, rect, Sense.click) } vars = part.vars(ctx, id) # class + per-id override hover = part.vars(ctx, id, "hover") # … with the state overlay