View controller

view_controller.dart

class ViewController<T> extends ComputableSubscriber<T> {
  ViewController({
    super.initialValue,
    super.broadcast,
  });

  T get model {
    return get();
  }
}

class ViewControllerBuilder<T extends ViewController<S>, S>
    extends StatefulWidget {
  final T Function() factory;
  final Widget Function(
    BuildContext context,
    S viewModel,
    T controller,
  ) builder;

  const ViewControllerBuilder({
    required this.factory,
    required this.builder,
  });

  @override
  ViewControllerBuilderState<T, S> createState() =>
      ViewControllerBuilderState<T, S>();
}

class ViewControllerBuilderState<T extends ViewController<S>, S>
    extends State<ViewControllerBuilder<T, S>> {
  late final T controller;

  @override
  initState() {
    super.initState();
    controller = widget.factory();
  }

  @override
  dispose() {
    super.dispose();
    controller.dispose();
  }

  @override
  build(context) {
    return ComputableBuilder(
      computable: controller,
      builder: (context, viewModel) {
        return widget.builder(context, viewModel, controller);
      },
    );
  }
}