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c121b2d2a6
* Upgrade to pkg:provider 4.0 * Follow best practice of ProxyProvider updating The addresses feedback from https://github.com/flutter/samples/issues/245. Instead of constructing a new `CartModel`, we merely update the `catalog` field. We no longer need a fancy constructor, and `CartModel._catalog` cannot be final any more.
49 lines
1.6 KiB
Dart
49 lines
1.6 KiB
Dart
// Copyright 2019 The Flutter team. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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import 'package:provider_shopper/common/theme.dart';
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import 'package:provider_shopper/models/cart.dart';
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import 'package:provider_shopper/models/catalog.dart';
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import 'package:provider_shopper/screens/cart.dart';
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import 'package:provider_shopper/screens/catalog.dart';
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void main() {
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runApp(MyApp());
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}
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class MyApp extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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// Using MultiProvider is convenient when providing multiple objects.
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return MultiProvider(
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providers: [
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// In this sample app, CatalogModel never changes, so a simple Provider
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// is sufficient.
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Provider(create: (context) => CatalogModel()),
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// CartModel is implemented as a ChangeNotifier, which calls for the use
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// of ChangeNotifierProvider. Moreover, CartModel depends
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// on CatalogModel, so a ProxyProvider is needed.
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ChangeNotifierProxyProvider<CatalogModel, CartModel>(
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create: (context) => CartModel(),
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update: (context, catalog, cart) {
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cart.catalog = catalog;
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return cart;
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},
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),
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],
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child: MaterialApp(
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title: 'Provider Demo',
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theme: appTheme,
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initialRoute: '/',
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routes: {
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'/': (context) => MyCatalog(),
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'/cart': (context) => MyCart(),
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},
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),
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);
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}
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}
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