Function onExpandedChange

packages/react-aria-components/src/Disclosure.tsx:187–193

(isExpanded)

    ...props,
    isExpanded,
    onExpandedChange(isExpanded) {
      if (groupState) {
        groupState.toggleKey(id);
      }

      props.onExpandedChange?.(isExpanded);
    }
  });

  let panelRef = React.useRef<HTMLDivElement | null>(null);