thesis_shop/lib/screens/product_list/product_list_screen.dart

import 'package:flutter/material.dart';
import 'package:thesis_shop/models/remote_resource.dart';
import 'package:thesis_shop/screens/product_list/cart_button_overlay.dart';
import 'package:thesis_shop/screens/product_list/product_list.dart';
import 'package:thesis_shop/stores/product_store.dart';
import 'package:thesis_shop/widgets/user_switch.dart';

class ProductListScreen extends StatelessWidget {
  const ProductListScreen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Thesis Shop'),
        actions: const [UserSwitch()],
      ),
      body: const _ProductStateSwitch(),
    );
  }
}

class _ProductStateSwitch extends StatelessWidget {
  const _ProductStateSwitch({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final remoteProducts = ProductStore.of(context).products;
    if (remoteProducts is FinishedRemoteResource) {
      final products = remoteProducts.asFinished().value;
      return CartButtonOverlay(
        child: ProductList(
          products: products,
        ),
      );
    } else if (remoteProducts is ErrorRemoteResource) {
      return Center(child: Text(remoteProducts.asError().errorMessage));
    } else if (remoteProducts is LoadingRemoteResource) {
      return const Center(child: CircularProgressIndicator.adaptive());
    } else {
      throw UnimplementedError();
    }
  }
}