README.md updated and models added.

README.md

@@ -2,3 +2,8 @@
 
 An app that uses 'Business Logic Component' design pattern and bloc state management.
 
+## Through this project, I've learned:
+
+-   bloc design pattern and state management.
+-   singleton and factory design pattern.
+-   

lib/data/cart_service.dart

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+import 'package:bloc_shopping/models/cart_item.dart';
+
+class CartService {
+  static List<CartItem> cartItems = List<CartItem>();
+
+  static CartService _singleton = CartService._internal();
+
+  factory CartService() {
+    return _singleton;
+  }
+
+  CartService._internal();
+
+  static void addToCart(CartItem cartItem) {
+    cartItems.add(cartItem);
+  }
+
+  static void removeFromCart(CartItem cartItem) {
+    cartItems.remove(cartItem);
+  }
+
+  static List<CartItem> getCart() {
+    return cartItems;
+  }
+}

lib/data/product_service.dart

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+import 'package:bloc_shopping/models/product.dart';
+
+class ProductService {
+  static List<Product> products = new List<Product>();
+
+  static ProductService _singleton = ProductService._internal();
+
+  factory ProductService() {
+    return _singleton;
+  }
+
+  ProductService._internal();
+
+  static List<Product> getAll() {
+    products.add(Product(1, "Acer Laptop", 6000));
+    products.add(Product(2, "MSI Laptop", 9000));
+    products.add(Product(3, "Asus Laptop", 8000));
+    return products;
+  }
+}

lib/models/cart_item.dart

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+import 'package:bloc_shopping/models/product.dart';
+
+class CartItem {
+  Product product;
+  int quantity;
+
+  CartItem(this.product, this.quantity);
+}

lib/models/product.dart

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+class Product {
+  int id;
+  String name;
+  double price;
+
+  Product(this.id, this.name, this.price);
+}