Tienda: Eliminar artículos

Parte de la sección Proyectos del Journey de Flutter de Coddy. Lección 26 de 36.

La gente cambia de opinión. Cada fila del carrito tiene un botón para quitar una unidad de ese producto, y la fila desaparece cuando ya no queda ninguna unidad.

void remove(Product product) {
  if (quantityOf(product) > 1) {
    _quantities[product] = quantityOf(product) - 1;
  } else {
    _quantities.remove(product);
  }
  notifyListeners();
}

Quitar la clave del mapa cuando la cantidad es 1, en lugar de establecerla en 0, es lo que hace que desaparezca la fila: items son las claves del mapa.

Ahora una fila termina con dos elementos: el total y el botón. trailing acepta un widget, así que coloca ambos en un Row con mainAxisSize: MainAxisSize.min, que hace que la fila solo tenga el ancho de su contenido.

Un carrito vacío merece un estado vacío, como el que tenía la lista de tareas pendientes: un icono de carrito tenue y una línea de texto en lugar de la lista.

Desafío

Intermedio

Permite que las personas quiten artículos:

añade el método remove a CartModel
haz que el trailing de cada fila sea un Row con su total y un IconButton con Icons.remove_circle_outline que quite una unidad
cuando el carrito esté vacío, muestra un Icons.shopping_cart_outlined centrado (tamaño 64, color outline del tema), 12 píxeles de espacio y Your cart is empty

Pruébalo tú mismo

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:provider/provider.dart';

void main() {
  runApp(
    ChangeNotifierProvider(
      create: (context) => CartModel(),
      child: const MyApp(),
    ),
  );
}

final money = NumberFormat.currency(locale: 'en_US', symbol: '\$');

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.orange),
      ),
      home: const ShopScreen(),
    );
  }
}

class Product {
  const Product({
    required this.name,
    required this.price,
    required this.icon,
    required this.color,
    required this.description,
  });

  final String name;
  final double price;
  final IconData icon;
  final MaterialColor color;
  final String description;
}

const List<Product> products = [
  Product(
    name: 'Headphones',
    price: 59,
    icon: Icons.headphones,
    color: Colors.indigo,
    description: 'Wireless headphones with 30 hours of battery.',
  ),
  Product(
    name: 'Watch',
    price: 129,
    icon: Icons.watch,
    color: Colors.teal,
    description: 'A smart watch that counts your steps.',
  ),
  Product(
    name: 'Backpack',
    price: 45.5,
    icon: Icons.backpack,
    color: Colors.orange,
    description: 'Room for a laptop, a lunch and a jacket.',
  ),
  Product(
    name: 'Mug',
    price: 12,
    icon: Icons.coffee,
    color: Colors.brown,
    description: 'Holds a big coffee and keeps it warm.',
  ),
  Product(
    name: 'Camera',
    price: 1299,
    icon: Icons.photo_camera,
    color: Colors.blueGrey,
    description: 'A mirrorless camera for sharp photos.',
  ),
  Product(
    name: 'Sneakers',
    price: 89.99,
    icon: Icons.directions_run,
    color: Colors.red,
    description: 'Light running shoes for every day.',
  ),
];

class CartModel extends ChangeNotifier {
  final Map<Product, int> _quantities = {};

  List<Product> get items => _quantities.keys.toList();
  int quantityOf(Product product) => _quantities[product] ?? 0;
  int get count => _quantities.values.fold(0, (sum, quantity) => sum + quantity);
  double get total => items.fold(0, (sum, product) => sum + product.price * quantityOf(product));

  void add(Product product) {
    _quantities[product] = quantityOf(product) + 1;
    notifyListeners();
  }
}

class ShopScreen extends StatelessWidget {
  const ShopScreen({super.key});

  @override
  Widget build(BuildContext context) {
    final count = context.watch<CartModel>().count;
    return Scaffold(
      appBar: AppBar(
        title: const Text('Coddy Shop'),
        actions: [
          Padding(
            padding: const EdgeInsets.only(right: 8),
            child: IconButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => const CartScreen()),
                );
              },
              icon: Badge(
                isLabelVisible: count > 0,
                label: Text('$count'),
                child: const Icon(Icons.shopping_cart),
              ),
            ),
          ),
        ],
      ),
      body: GridView.count(
        crossAxisCount: 2,
        padding: const EdgeInsets.all(16),
        mainAxisSpacing: 12,
        crossAxisSpacing: 12,
        childAspectRatio: 0.8,
        children: [
          for (Product product in products) ProductCard(product: product),
        ],
      ),
    );
  }
}

class ProductCard extends StatelessWidget {
  const ProductCard({super.key, required this.product});

  final Product product;

  @override
  Widget build(BuildContext context) {
    return Card(
      clipBehavior: Clip.antiAlias,
      child: InkWell(
        onTap: () {
          Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) => ProductScreen(product: product),
            ),
          );
        },
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Expanded(
              child: Container(
                width: double.infinity,
                alignment: Alignment.center,
                color: product.color.shade50,
                child: Icon(product.icon, size: 56, color: product.color),
              ),
            ),
            Padding(
              padding: const EdgeInsets.all(12),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    product.name,
                    style: Theme.of(context).textTheme.titleMedium,
                  ),
                  const SizedBox(height: 4),
                  Text(
                    money.format(product.price),
                    style: TextStyle(
                      fontWeight: FontWeight.bold,
                      color: Theme.of(context).colorScheme.primary,
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class ProductScreen extends StatelessWidget {
  const ProductScreen({super.key, required this.product});

  final Product product;

  @override
  Widget build(BuildContext context) {
    final textTheme = Theme.of(context).textTheme;
    return Scaffold(
      appBar: AppBar(title: Text(product.name)),
      body: ListView(
        padding: const EdgeInsets.all(24),
        children: [
          Container(
            height: 240,
            alignment: Alignment.center,
            decoration: BoxDecoration(
              color: product.color.shade50,
              borderRadius: BorderRadius.circular(24),
            ),
            child: Icon(product.icon, size: 120, color: product.color),
          ),
          const SizedBox(height: 24),
          Text(
            money.format(product.price),
            style: textTheme.headlineSmall?.copyWith(
              fontWeight: FontWeight.bold,
              color: Theme.of(context).colorScheme.primary,
            ),
          ),
          const SizedBox(height: 12),
          Text(product.description, style: textTheme.bodyLarge),
          const SizedBox(height: 32),
          FilledButton.icon(
            onPressed: () {
              context.read<CartModel>().add(product);
              ScaffoldMessenger.of(context).hideCurrentSnackBar();
              ScaffoldMessenger.of(context).showSnackBar(
                SnackBar(content: Text('Added ${product.name} to your cart')),
              );
            },
            icon: const Icon(Icons.add_shopping_cart),
            label: const Text('Add to cart'),
          ),
        ],
      ),
    );
  }
}

class CartScreen extends StatelessWidget {
  const CartScreen({super.key});

  @override
  Widget build(BuildContext context) {
    final cart = context.watch<CartModel>();
    return Scaffold(
      appBar: AppBar(title: const Text('Your Cart')),
      bottomNavigationBar: SafeArea(
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Row(
            children: [
              Text('Total', style: Theme.of(context).textTheme.titleLarge),
              const Spacer(),
              Text(
                money.format(cart.total),
                style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
              ),
            ],
          ),
        ),
      ),
      body: ListView(
        children: [
          for (Product product in cart.items)
            ListTile(
              leading: CircleAvatar(
                backgroundColor: product.color.shade50,
                child: Icon(product.icon, color: product.color),
              ),
              title: Text(product.name),
              subtitle: Text('${cart.quantityOf(product)} × ${money.format(product.price)}'),
              trailing: Text(money.format(product.price * cart.quantityOf(product))),
            ),
        ],
      ),
    );
  }
}