key property
String?
key
Unique key per list item
Implementation
String? get key {
if (this is ListHeaderItem) {
final header = (this as ListHeaderItem).heading;
return 'HEADER-${header.toLowerCase()}';
}
if (this is ListUserItem) {
final user = (this as ListUserItem).user;
return 'USER-${user.id}';
}
return null;
}