onTapBefore property
A callback function to be called before dropdown button tapped. Note that the returned future will be awaited, so use Future.microtask if necessary.
Implementation
final FutureOr<void> Function()? onTapBefore;
A callback function to be called before dropdown button tapped. Note that the returned future will be awaited, so use Future.microtask if necessary.
final FutureOr<void> Function()? onTapBefore;