| // Copyright 2014 The Flutter Authors. 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:async'; |
| |
| import 'package:flutter/material.dart'; |
| import 'package:flutter_driver/driver_extension.dart'; |
| |
| import 'component1.dart' deferred as component1; |
| |
| void main() { |
| enableFlutterDriverExtension(); |
| runApp(const MyApp()); |
| } |
| |
| class MyApp extends StatelessWidget { |
| const MyApp({super.key}); |
| |
| @override |
| Widget build(BuildContext context) { |
| return MaterialApp( |
| title: 'Flutter Deferred Components Example', |
| theme: ThemeData( |
| primarySwatch: Colors.blue, |
| visualDensity: VisualDensity.adaptivePlatformDensity, |
| ), |
| home: const MyHomePage(), |
| ); |
| } |
| } |
| |
| class MyHomePage extends StatefulWidget { |
| const MyHomePage({super.key}); |
| |
| @override |
| MyHomePageState createState() => MyHomePageState(); |
| } |
| |
| class MyHomePageState extends State<MyHomePage> { |
| Future<void>? libraryFuture; |
| |
| Widget postLoadDisplayWidget = const Text( |
| 'placeholder', |
| key: Key('PlaceholderText'), |
| ); |
| |
| @override |
| void initState() { |
| // Automatically trigger load for release test without driver. |
| Future<void>.delayed(const Duration(milliseconds: 3000), () { |
| _pressHandler(); |
| }); |
| super.initState(); |
| } |
| |
| void _pressHandler() { |
| if (libraryFuture == null) { |
| setState(() { |
| libraryFuture = component1.loadLibrary().then((dynamic _) { |
| // Delay to give debug runs more than one frame to capture |
| // the placeholder text. |
| Future<void>.delayed(const Duration(milliseconds: 750), () { |
| setState(() { |
| postLoadDisplayWidget = component1.LogoScreen(); |
| }); |
| }); |
| }); |
| }); |
| } |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| final Widget testWidget = libraryFuture == null ? const Text('preload', key: Key('PreloadText')) : |
| FutureBuilder<void>( |
| future: libraryFuture, |
| builder: (BuildContext context, AsyncSnapshot<void> snapshot) { |
| if (snapshot.connectionState == ConnectionState.done) { |
| if (snapshot.hasError) { |
| return Text('Error: ${snapshot.error}'); |
| } |
| return postLoadDisplayWidget; |
| } |
| return postLoadDisplayWidget; |
| }, |
| ); |
| return Scaffold( |
| appBar: AppBar( |
| title: const Text('Deferred components test'), |
| ), |
| body: Center( |
| child: testWidget, |
| ), |
| floatingActionButton: FloatingActionButton( |
| key: const Key('FloatingActionButton'), |
| onPressed: _pressHandler, |
| tooltip: 'Load', |
| child: const Icon(Icons.add), |
| ), |
| ); |
| } |
| } |