149 lines
5.9 KiB
Dart
149 lines
5.9 KiB
Dart
import 'package:flutter/material.dart';
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import 'ffi.dart' if (dart.library.html) 'ffi_web.dart';
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void main() {
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runApp(const MyApp());
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}
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class MyApp extends StatelessWidget {
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const MyApp({Key? key}) : super(key: key);
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// This widget is the root of your application.
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Flutter Demo',
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theme: ThemeData(
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// This is the theme of your application.
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//
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// Try running your application with "flutter run". You'll see the
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// application has a blue toolbar. Then, without quitting the app, try
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// changing the primarySwatch below to Colors.green and then invoke
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// "hot reload" (press "r" in the console where you ran "flutter run",
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// or simply save your changes to "hot reload" in a Flutter IDE).
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// Notice that the counter didn't reset back to zero; the application
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// is not restarted.
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primarySwatch: Colors.blue,
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),
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home: const MyHomePage(title: 'Flutter Demo Home Page'),
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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const MyHomePage({Key? key, required this.title}) : super(key: key);
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// This widget is the home page of your application. It is stateful, meaning
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// that it has a State object (defined below) that contains fields that affect
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// how it looks.
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// This class is the configuration for the state. It holds the values (in this
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// case the title) provided by the parent (in this case the App widget) and
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// used by the build method of the State. Fields in a Widget subclass are
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// always marked "final".
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final String title;
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@override
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State<MyHomePage> createState() => _MyHomePageState();
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}
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class _MyHomePageState extends State<MyHomePage> {
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// These futures belong to the state and are only initialized once,
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// in the initState method.
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late Future<Platform> platform;
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late Future<bool> isRelease;
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@override
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void initState() {
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super.initState();
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platform = api.platform();
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isRelease = api.rustReleaseMode();
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}
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@override
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Widget build(BuildContext context) {
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// This method is rerun every time setState is called.
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//
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// The Flutter framework has been optimized to make rerunning build methods
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// fast, so that you can just rebuild anything that needs updating rather
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// than having to individually change instances of widgets.
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return Scaffold(
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appBar: AppBar(
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// Here we take the value from the MyHomePage object that was created by
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// the App.build method, and use it to set our appbar title.
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title: Text(widget.title),
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),
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body: Center(
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// Center is a layout widget. It takes a single child and positions it
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// in the middle of the parent.
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child: Column(
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// Column is also a layout widget. It takes a list of children and
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// arranges them vertically. By default, it sizes itself to fit its
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// children horizontally, and tries to be as tall as its parent.
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//
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// Invoke "debug painting" (press "p" in the console, choose the
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// "Toggle Debug Paint" action from the Flutter Inspector in Android
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// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
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// to see the wireframe for each widget.
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//
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// Column has various properties to control how it sizes itself and
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// how it positions its children. Here we use mainAxisAlignment to
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// center the children vertically; the main axis here is the vertical
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// axis because Columns are vertical (the cross axis would be
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// horizontal).
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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const Text("You're running on"),
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// To render the results of a Future, a FutureBuilder is used which
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// turns a Future into an AsyncSnapshot, which can be used to
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// extract the error state, the loading state and the data if
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// available.
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//
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// Here, the generic type that the FutureBuilder manages is
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// explicitly named, because if omitted the snapshot will have the
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// type of AsyncSnapshot<Object?>.
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FutureBuilder<List<dynamic>>(
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// We await two unrelated futures here, so the type has to be
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// List<dynamic>.
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future: Future.wait([platform, isRelease]),
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builder: (context, snap) {
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final style = Theme.of(context).textTheme.headlineMedium;
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if (snap.error != null) {
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// An error has been encountered, so give an appropriate response and
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// pass the error details to an unobstructive tooltip.
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debugPrint(snap.error.toString());
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return Tooltip(
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message: snap.error.toString(),
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child: Text('Unknown OS', style: style),
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);
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}
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// Guard return here, the data is not ready yet.
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final data = snap.data;
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if (data == null) return const CircularProgressIndicator();
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// Finally, retrieve the data expected in the same order provided
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// to the FutureBuilder.future.
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final Platform platform = data[0];
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final release = data[1] ? 'Release' : 'Debug';
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final text = const {
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Platform.AndroidBish: 'Android, bish',
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Platform.Ios: 'iOS',
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Platform.MacApple: 'MacOS with Apple Silicon',
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Platform.MacIntel: 'MacOS',
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Platform.Windows: 'Windows',
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Platform.Unix: 'Unix',
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Platform.Wasm: 'the Web',
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}[platform] ??
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'Unknown OS';
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return Text('$text ($release)', style: style);
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},
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)
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],
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),
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),
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);
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}
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}
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