onConfirmTap method
Pops the dialog from the navigation stack and returns the selected values. Calls the onConfirm function if one was provided.
Implementation
void onConfirmTap(
BuildContext ctx, List<T> selectedValues, Function(List<T>)? onConfirm) {
Navigator.pop(ctx, selectedValues);
if (onConfirm != null) {
onConfirm(selectedValues);
}
}