open method

void open()

Get the tap region group ID used by this dropdown. Use this ID to group control buttons with the dropdown so they won't trigger the onTapOutside handler. Wrap your buttons with TapRegion(groupId: tapRegionGroupId, ...) This ID is available immediately and doesn't require state attachment.

Implementation

// Object? get tapRegionGroupId => _state?.tapRegionID;

void open() {
  _state?._openFromController();
}