Created
November 10, 2016 09:08
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| import 'dart:io'; | |
| import 'dart:async'; | |
| import 'dart:convert'; | |
| import 'package:csv/csv.dart'; | |
| import 'package:flutter/material.dart'; | |
| import 'package:flutter/services.dart' show rootBundle; | |
| class Product { | |
| const Product({this.name}); | |
| final String name; | |
| } | |
| typedef void CartChangedCallback(Product product, bool inCart); | |
| class ShoppingListItem extends StatelessWidget { | |
| ShoppingListItem({Product product, this.inCart, this.onCartChanged}) | |
| : product = product, | |
| super(key: new ObjectKey(product)); | |
| final Product product; | |
| final bool inCart; | |
| final CartChangedCallback onCartChanged; | |
| Color _getColor(BuildContext context) { | |
| return inCart ? Colors.black54 : Theme.of(context).primaryColor; | |
| } | |
| TextStyle _getTextStyle(BuildContext context) { | |
| if (!inCart) return null; | |
| return new TextStyle( | |
| color: Colors.black54, | |
| decoration: TextDecoration.lineThrough, | |
| ); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return new ListItem( | |
| onTap: () { | |
| onCartChanged(product, !inCart); | |
| }, | |
| leading: new CircleAvatar( | |
| backgroundColor: _getColor(context), | |
| child: new Text(product.name[0]), | |
| ), | |
| title: new Text(product.name, style: _getTextStyle(context)), | |
| ); | |
| } | |
| } | |
| class ShoppingList extends StatefulWidget { | |
| ShoppingList({Key key, this.products}) : super(key: key); | |
| var products; | |
| @override | |
| _ShoppingListState createState() => new _ShoppingListState(); | |
| } | |
| class _ShoppingListState extends State<ShoppingList> { | |
| Set<Product> _shoppingCart = new Set<Product>(); | |
| @override | |
| void initState() { | |
| super.initState(); | |
| final builder = new ProductBuilder(); | |
| builder.build().then((List<Product> list) { | |
| setState(() { | |
| config.products = list; | |
| }); | |
| }); | |
| } | |
| void _handleCartChanged(Product product, bool inCart) { | |
| setState(() { | |
| if (inCart) | |
| _shoppingCart.add(product); | |
| else | |
| _shoppingCart.remove(product); | |
| }); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return new Scaffold( | |
| appBar: new AppBar( | |
| title: new Text('Shopping List'), | |
| ), | |
| body: new MaterialList( | |
| type: MaterialListType.oneLineWithAvatar, | |
| children: config.products.map((Product product) { | |
| return new ShoppingListItem( | |
| product: product, | |
| inCart: _shoppingCart.contains(product), | |
| onCartChanged: _handleCartChanged, | |
| ); | |
| }), | |
| ), | |
| ); | |
| } | |
| } | |
| class ProductBuilder { | |
| Future<List<Product>> build() async { | |
| final csvStr = await rootBundle.loadString('assets/csv/all.csv'); | |
| final csv = await new CsvToListConverter().convert(csvStr, eol: "\n"); | |
| var _kProducts = <Product>[]; | |
| csv.forEach((List<String> list) { | |
| _kProducts.add(new Product(name: list[0])); | |
| }); | |
| return _kProducts; | |
| } | |
| } | |
| void main() { | |
| runApp(new MaterialApp( | |
| title: 'Shopping List', | |
| home: new ShoppingList(products: []), | |
| )); | |
| } |
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