Provider architecture

A useful architecture separates presentation from application state and infrastructure. Provider can expose state objects to the widget tree without making every widget responsible for data access.

class InventoryProvider extends ChangeNotifier {
  final InventoryRepository repository;
  List<Item> items = [];

  Future<void> load() async {
    items = await repository.load();
    notifyListeners();
  }
}

Practical structure

• models/ — immutable or serializable domain objects
• providers/ — ChangeNotifier state and commands
• services/ — storage, notifications and integrations
• screens/ — page-level composition
• widgets/ — reusable visual components