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samples/provider_shopper/lib/main.dart

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2.5 KiB

// Copyright 2019 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:provider_shopper/common/theme.dart';
import 'package:provider_shopper/models/cart.dart';
import 'package:provider_shopper/models/catalog.dart';
import 'package:provider_shopper/screens/cart.dart';
import 'package:provider_shopper/screens/catalog.dart';
import 'package:provider_shopper/screens/login.dart';
import 'package:window_size/window_size.dart';
void main() {
setupWindow();
runApp(const MyApp());
}
const double kWindowWidth = 400;
const double kWindowHeight = 800;
void setupWindow() {
if (!kIsWeb && (Platform.isWindows || Platform.isLinux || Platform.isMacOS)) {
WidgetsFlutterBinding.ensureInitialized();
setWindowTitle('Provider Demo');
setWindowMinSize(const Size(kWindowWidth, kWindowHeight));
setWindowMaxSize(const Size(kWindowWidth, kWindowHeight));
getCurrentScreen().then((screen) {
setWindowFrame(Rect.fromCenter(
center: screen!.frame.center,
width: kWindowWidth,
height: kWindowHeight,
));
});
}
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
// Using MultiProvider is convenient when providing multiple objects.
return MultiProvider(
providers: [
// In this sample app, CatalogModel never changes, so a simple Provider
// is sufficient.
Provider(create: (context) => CatalogModel()),
// CartModel is implemented as a ChangeNotifier, which calls for the use
// of ChangeNotifierProvider. Moreover, CartModel depends
// on CatalogModel, so a ProxyProvider is needed.
ChangeNotifierProxyProvider<CatalogModel, CartModel>(
create: (context) => CartModel(),
update: (context, catalog, cart) {
if (cart == null) throw ArgumentError.notNull('cart');
cart.catalog = catalog;
return cart;
},
),
],
child: MaterialApp(
title: 'Provider Demo',
theme: appTheme,
initialRoute: '/',
routes: {
'/': (context) => const MyLogin(),
'/catalog': (context) => const MyCatalog(),
'/cart': (context) => const MyCart(),
},
),
);
}
}