Store: Quantities

Part of the Projects section of Coddy's Flutter journey. Lesson 25 of 36.

Add the mug twice and the cart lists it twice. Real carts show it once, with "2 ×". The cart should store how many of each product, which is a Map from product to quantity:

final Map<Product, int> _quantities = {};

int quantityOf(Product product) => _quantities[product] ?? 0;

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

Reading a key the map does not have gives null, so ?? 0 turns "not in the cart" into 0. A map remembers the order keys were added, so the rows keep the order you shopped in.

The getters change with it. items becomes the map's keys, count adds up the quantities, and total multiplies each price by its quantity:

List<Product> get items => _quantities.keys.toList();
int get count => _quantities.values.fold(0, (sum, quantity) => sum + quantity);

The cart screen still loops over cart.items. Because the getters kept their names, only the model and the row change.

Challenge

Hard

Count each product once:

in CartModel, replace the list with the _quantities map, quantityOf and the new add, items and count
make total add product.price * quantityOf(product) for each item
in each cart row, show 2 × $12.00 as the subtitle, and the row's own total (price times quantity) as trailing

Try it yourself

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 List<Product> _items = [];

  List<Product> get items => _items;
  int get count => _items.length;
  double get total => _items.fold(0, (sum, product) => sum + product.price);

  void add(Product product) {
    _items.add(product);
    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),
              trailing: Text(money.format(product.price)),
            ),
        ],
      ),
    );
  }
}