CheckedPopupMenuItem<T> class

PopupMenuButton<Commands>(
  onSelected: (Commands result) {
    switch (result) {
      case Commands.heroAndScholar:
        setState(() { _heroAndScholar = !_heroAndScholar; });
      case Commands.hurricaneCame:
        // ...handle hurricane option
        break;
      // ...other items handled here
    }
  },
  itemBuilder: (BuildContext context) => <PopupMenuEntry<Commands>>[
    CheckedPopupMenuItem<Commands>(
      checked: _heroAndScholar,
      value: Commands.heroAndScholar,
      child: const Text('Hero and scholar'),
    ),
    const PopupMenuDivider(),
    const PopupMenuItem<Commands>(
      value: Commands.hurricaneCame,
      child: ListTile(leading: Icon(null), title: Text('Bring hurricane')),
    ),
    // ...other items listed here
  ],
)