Flutter小功能实现-咖啡店

1 导航栏实现

效果图：

1.Package

google_nav_bar: ^5.0.6

使用文档：

google_nav_bar | Flutter Package

2.Code

//MyBottomNavBar

class MyBottomNavBar extends StatelessWidget {void Function(int)? onTabChange;MyBottomNavBar({super.key, required this.onTabChange});@overrideWidget build(BuildContext context) {return Container(margin: const EdgeInsets.all(25),child: GNav(onTabChange: (value) => onTabChange!(value),color: Colors.grey[400],mainAxisAlignment: MainAxisAlignment.center,activeColor: Colors.grey[700],tabBackgroundColor: Colors.grey.shade300,tabBorderRadius: 24,tabActiveBorder: Border.all(color: Colors.white),tabs: const [GButton(icon: Icons.home, text: 'Shop'),GButton(icon: Icons.shopping_bag_outlined, text: 'Cart'),]),);}
}

//HomePage

class HomePage extends StatefulWidget {const HomePage({super.key});@overrideState<HomePage> createState() => _HomePageState();
}class _HomePageState extends State<HomePage> {int _selectPage = 0;final List<Widget> _pages = [ShopPage(), CartPage()];@overrideWidget build(BuildContext context) {return Scaffold(backgroundColor: backgroundColor,bottomNavigationBar: MyBottomNavBar(onTabChange: (index) => navigateBottomBar(index),),body: _pages[_selectPage],);}///点击底部按钮响切换///navigateBottomBar(int index) {setState(() {_selectPage = index;});}
}

2 商品列表实现

1.Package

provider

使用文档：

provider | Flutter Package

2.Code

Models 数据模型

Coffee 咖啡数据模型：名称、价格、图片

CoffeeShop 咖啡售卖数据模型：coffeeShop 在售咖啡种类，userCart用户购物车，addItemToCart添加到购物车方法，removeItemFromCart从购物车移除方法

class Coffee {final String name;final String price;final String imagePath;Coffee({required this.name, required this.price, required this.imagePath});
}class CoffeeShop extends ChangeNotifier {//sale listfinal List<Coffee> _shop = [Coffee(name: 'Long Black',price: '4.10',imagePath: 'lib/images/coffee-cup.png'),Coffee(name: 'Espresso', price: '4.10', imagePath: 'lib/images/espresso.png'),Coffee(name: 'Frappe', price: '4.10', imagePath: 'lib/images/frappe.png'),Coffee(name: 'Iced', price: '4.10', imagePath: 'lib/images/iced.png'),Coffee(name: 'Latte', price: '4.10', imagePath: 'lib/images/latte.png'),];//user cartfinal List<Coffee> _userCart = [];//get coffee listList<Coffee> get coffeeShop => _shop;//get user cartList<Coffee> get userCart => _userCart;//add item to cartvoid addItemToCart(Coffee coffee) {_userCart.add(coffee);notifyListeners();}//remove item from cartvoid removeItemFromCart(Coffee coffee) {_userCart.remove(coffee);notifyListeners();}
}

商品展示Tile组件

class CoffeeTile extends StatelessWidget {final Coffee coffee;final Icon icon;void Function()? onPressed;CoffeeTile({super.key,required this.coffee,required this.onPressed,required this.icon,});@overrideWidget build(BuildContext context) {return Container(decoration: BoxDecoration(color: Colors.grey[200], borderRadius: BorderRadius.circular(12)),margin: const EdgeInsets.only(bottom: 10),padding: const EdgeInsets.symmetric(vertical: 25, horizontal: 10),child: ListTile(title: Text(coffee.name),subtitle: Text(coffee.price),leading: Image.asset(coffee.imagePath),trailing: IconButton(icon: icon,onPressed: onPressed,),),);}
}