以下是购物车页面的代码：
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import '../models/cart.dart';
import '../services/api_service.dart';
class CartPage extends StatefulWidget {
@override
_CartPageState createState() => _CartPageState();
}
class _CartPageState extends State {
List _carts = [];
double _totalPrice = 0;
@override
void initState() {
super.initState();
_loadCart();
}
void _loadCart() async {
List jsonData = await ApiService.getShoppingCart();
List carts = [];
_totalPrice = jsonData.removeLast();
jsonData.forEach((cartJson) {
Cart cart = Cart.fromJson(cartJson);
carts.add(cart);
});
setState(() {
_carts = carts;
});
}
void _updateCart(int productId, int quantity) async {
List jsonData =
await ApiService.updateCart(productId: productId, quantity: quantity);
_totalPrice = jsonData.removeAt(0);
int index = _carts.indexWhere((cart) => cart.product.id == productId);
_carts[index] = Cart.fromJson(jsonData[0]);
setState(() {});
}
void _deleteCart(int productId) async {
double totalPrice = await ApiService.deleteCart(productId: productId);
Fluttertoast.showToast(
msg: "删除成功",
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.CENTER,
timeInSecForIosWeb: 1,
backgroundColor: Colors.grey[600],
textColor: Colors.white,
fontSize: 16.0);
_totalPrice = totalPrice;
_carts.removeWhere((cart) => cart.product.id == productId);
setState(() {});
}
void _showPayDialog() {
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text('请选择支付方式'),
content: Column(
mainAxisSize: MainAxisSize.min,
children: [
Row(
children: [
Radio(
value: 1,
groupValue: 0,
onChanged: (int? value) {},
),
Text('支付宝'),
],
),
Row(
children: [
Radio(
value: 2,
groupValue: 0,
onChanged: (int? value) {},
),
Text('微信'),
],
),
],
),
actions: [
FlatButton(
child: Text('取消'),
onPressed: () {
Navigator.of(context).pop();
},
),
FlatButton(
child: Text('确认'),
onPressed: () {
Navigator.of(context).pop();
_submitOrder();
},
),
],
);
});
}
void _submitOrder() async {
List jsonData = await ApiService.getAddresses();
if (jsonData.isEmpty) {
Fluttertoast.showToast(
msg: "请先添加地址",
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.CENTER,
timeInSecForIosWeb: 1,
backgroundColor: Colors.grey[600],
textColor: Colors.white,
fontSize: 16.0);
return;
}
int addressId;
for (dynamic json in jsonData) {
if (json['isDefault'] == 1) {
addressId = json['id'];
break;
}
}
if (addressId == null) {
addressId = jsonData[0]['id'];
}
await ApiService.submitOrder(
addressId: addressId, paymentMethod: '支付宝');
Fluttertoast.showToast(
msg: "下单成功",
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.CENTER,
timeInSecForIosWeb: 1,
backgroundColor: Colors.grey[600],
textColor: Colors.white,
fontSize: 16.0);
Navigator.of(context).pop();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('购物车')),
body: Column(
children: [
Expanded(
child: ListView.builder(
itemCount: _carts.length,
itemBuilder: (BuildContext context, int index) {
final cart = _carts[index];
return ListTile(
leading: Image.network(cart.product.imageUrl),
title: Text(cart.product.name),
subtitle: Text('单价: ¥${cart.product.price}'),
trailing: Row(
mainAxisSize: MainAxisSize.min,
children: [
IconButton(
icon: Icon(Icons.remove),
onPressed: () {
if (cart.quantity > 1) {
_updateCart(cart.product.id, cart.quantity - 1);
} else {
_deleteCart(cart.product.id);
}
},
),
Text('${cart.quantity}'),
IconButton(
icon: Icon(Icons.add),
onPressed: () {
_updateCart(cart.product.id, cart.quantity + 1);
},
),
],
),
);
},
),
),
Container(
padding: EdgeInsets.symmetric(horizontal: 16),
height: 50,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text('总价: ¥${_totalPrice.toStringAsFixed(2)}'),
RaisedButton(
child: Text('结算'),
onPressed: _showPayDialog,
),
],
),
),
],
),
);
}
