Confirming a Flutter Dismissible swipe event

dismissible_swipe_confirm.dart

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(),
    body: ListView.builder(
      itemCount: items.length,
      itemBuilder: (context, index) {
        var item = items[index];
        return Dismissible(
        ...
        confirmDismiss: (direction) => promptUser(direction));
      },
    ),
  );
}

Future<bool> promptUser(DismissDirection direction) async {
  String action;
  if (direction == DismissDirection.startToEnd) {
    // This is a delete action
    action = "delete";
  } else {
    archiveItem();
    // This is an archive action
    action = "archive";
  }

  return await showCupertinoDialog<bool>(
        context: context,
        builder: (context) => CupertinoAlertDialog(
          content: Text("Are you sure you want to $action?"),
          actions: <Widget>[
            CupertinoDialogAction(
              child: Text("Ok"),
              onPressed: () {
                // Dismiss the dialog and
                // also dismiss the swiped item
                Navigator.of(context).pop(true);
              },
            ),
            CupertinoDialogAction(
              child: Text('Cancel'),
              onPressed: () {
                // Dismiss the dialog but don't
                // dismiss the swiped item
                return Navigator.of(context).pop(false);
              },
            )
          ],
        ),
      ) ??
      false; // In case the user dismisses the dialog by clicking away from it
}