// 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 'dart:io'; import 'dart:math'; import 'package:flutter/material.dart'; import 'package:flutter/services.dart'; /// An example that sets up local http server for serving single /// image, creates single flutter widget with five copies of requested /// image and prints how long the loading took. /// /// This is used in [$FH/flutter/devicelab/bin/tasks/image_list_reported_duration.dart] test. /// /// /// To generate new certificate: /// /// $ openssl req -new -out image_list.csr /// Generating a 2048 bit RSA private key /// Enter PEM pass phrase: <random string> /// ... /// Common Name (eg, fully qualified host name) []:localhost /// /// Copy content of the privateKey below into image_list.key file, then /// $ openssl x509 -req -sha256 -days 3650 -in image_list.csr -signkey image_list.key -out image_list.crt /// /// Copy content of the image_list.crt into certificate string below. String certificate = ''' -----BEGIN CERTIFICATE----- MIICpDCCAYwCCQD1kfAz8IhbazANBgkqhkiG9w0BAQsFADAUMRIwEAYDVQQDDAls b2NhbGhvc3QwHhcNMjAwODI0MjE1MTUwWhcNMzAwODIyMjE1MTUwWjAUMRIwEAYD VQQDDAlsb2NhbGhvc3QwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCi /fmozdYuCIZbJS7y4zYPp2NRboLXrpUcUzzvzz+24k/TYUPNeRvf6wiNXHvr1ijM g1j3wQP72RphxI7cY7XCwzRiM5QeQy3EtRz4ETYBzOev3mHLLEgZ9RnSq/u42siS S9CNjoz97liPyQUq8h37/09qhYG0hR/2pRN+YB9g7sNYoGe2B7zkh3azRS0/Ltgl tXwHUId7QzJc15W9Q7adsNVTpOCo7dOj2KWz6sEtFGkYfwLV5uiTslRdWCCOUD9i ZjCtlPqALkGnWyhNiFJESLbVNC6MURyMngcALW0JTMwc2oDjMxtdNkMl0cdzPlhX MDKIKpY9bWbRKUUdsfOnAgMBAAEwDQYJKoZIhvcNAQELBQADggEBAHZo/Io7hE9P jDhSSP+4iSwx6xjnkRjBHReoea+XwSCv1s9Alwe1Nub6u5jUBhCpGCyU4diKFV1W zhunXKY+zRGGtr09nYoN9UVizS5fAFb+h2x3Tw8lsxs4JpPQeWTbGK9Ci+jyfuZu xPvdU8I8oxiTRPoWa1KpPm6UVvcrjyftvbqJ4l7cZ8KZN4JNSZlphX8lIM14xR4H 12sFFTcYWPNDTqO1A9MSflG4OkG59LDHV36JAEqB61pP8hipowVp48+rzD2DVpqb r/Mw+0x0HENUTMVExSA5rj/3fxNMggUSl2YsujVJjkb1LiQNPORX7rBndcjknAMt TvaTkrwwZA4= -----END CERTIFICATE----- '''; String privateKey = ''' -----BEGIN PRIVATE KEY----- MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCi/fmozdYuCIZb JS7y4zYPp2NRboLXrpUcUzzvzz+24k/TYUPNeRvf6wiNXHvr1ijMg1j3wQP72Rph xI7cY7XCwzRiM5QeQy3EtRz4ETYBzOev3mHLLEgZ9RnSq/u42siSS9CNjoz97liP yQUq8h37/09qhYG0hR/2pRN+YB9g7sNYoGe2B7zkh3azRS0/LtgltXwHUId7QzJc 15W9Q7adsNVTpOCo7dOj2KWz6sEtFGkYfwLV5uiTslRdWCCOUD9iZjCtlPqALkGn WyhNiFJESLbVNC6MURyMngcALW0JTMwc2oDjMxtdNkMl0cdzPlhXMDKIKpY9bWbR KUUdsfOnAgMBAAECggEADUStiS9Qayjofwz02HLkmLugmyVq41Hj841XHZJ6dlHP +74kPdrJCR5h8NgBgn5JjfR3TpvYziyrOCA/HPPE/RjU79WRDjGbzTKNLCiCg/0B M1DgFyEAsZRBSOQVNsQgpcAkNxHOqnE3pmTP1eIlzLjI5zv9Bgv8QSDJCHWcuFA2 NrvGudq3dlFnZwjipx0k0E1hCsaClqLsi5jEXIBA6TX7RTeeXjC+j2/DlmTpBxo0 c34o/sSoCl+mfJDQ3QApXLFuycBl7nauO0M+VsUWrKYqHHr4NIcgoIpIX28QjWc/ Y2+iooMSBO1ToK2nPD8hZQwNDF8xz6Xf7QNkTOpnqQKBgQDNgfNYkEvgWxhSMmW7 cK06supZC/isj2JfQmlJc80JcAvf8rpynZLi4XWZWRo0PykM4szI91h3YHTG27VX YVHSsFs+6FwP7fLAHR7FYn65p/bwTuqpWGjcmQhc0HWx7y45HRIoSK/m+Z7lNA/J QxnCp1khTmhPqCNglo+38vZSzQKBgQDLCeBhji0K/BOmCrhNxRxrCvHYEd6gqRtC +rKhco6mMrxma/UmggRKoGXg0yMcya3199y3pDkumHSlcMdUb+I9b+3j8R6ivoqN TI1ned5K1uq3FyZpD0dZQWuunVeqYXuUQw5y5GxvK7haohbVpUG6lC3qYq2ubiYC D0ENUfNoQwKBgEGucOozZCzWsJVEykL4JkWGfWPscZQlV5l+jkwNmNCVYRY4a+LJ /fJJgN58HeXo8ePOcQkiFMJCr9AG1JSS5CXke6VFencU4+sG45jOfBY2WrQ/ZLyv JwSqXIPdlGBEQ4+5fN4nLSEzUteKpij7KzaNae09NBWRdY0fUdvG6XdZAoGAf02S /TfKsB97JlmEU2aqOcdj+WjC4JMG/8j2JVoRbM1U6Rb5X4qXrD7DgeKAGnWteBJP tmjmXXvDb1O19xArlv/N9WRiJAI6FvwPkPiNUvlLsz51m9uzjZgCLzqCE9cJR91/ erQT9ORBs7n7fTsfah+sZlA2u65ecF4mGHbwmccCgYAqHNRHnx1iHrYfr97cmXc9 fNjJ7e1NHhVdgpGjaOiBSKj2rHNRy6iwCNbs5wjmRWlgqnFEM5r0VfFn9L0PvcQK 7iExMTm/PkSqHUntpy82Q8zRWmhw0G5p9DYyIPtaeW1NIKpIlCw6dTlf750BiGkr mhBKvYQc85gja0s1c+1VXA== -----END PRIVATE KEY----- '''; class MyHttpOverrides extends HttpOverrides { @override HttpClient createHttpClient(SecurityContext? context) { return super.createHttpClient( (context ?? SecurityContext())..setTrustedCertificatesBytes(certificate.codeUnits), ); } } Future<void> main() async { HttpOverrides.global = MyHttpOverrides(); final SecurityContext serverContext = SecurityContext() ..useCertificateChainBytes(certificate.codeUnits) ..usePrivateKeyBytes(privateKey.codeUnits); final HttpServer httpServer = await HttpServer.bindSecure('localhost', 0, serverContext); final int port = httpServer.port; debugPrint('Listening on port $port.'); // Initializes bindings before using any platform channels. WidgetsFlutterBinding.ensureInitialized(); final ByteData byteData = await rootBundle.load('images/coast.jpg'); httpServer.listen((HttpRequest request) async { const int chunk_size = 2048; int offset = byteData.offsetInBytes; while (offset < byteData.lengthInBytes) { final int length = min(byteData.lengthInBytes - offset, chunk_size); final Uint8List bytes = byteData.buffer.asUint8List(offset, length); offset += length; request.response.add(bytes); // Let other isolates and microtasks to run. await Future<void>.delayed(Duration.zero); } request.response.close(); }); runApp(MyApp(port)); } const int IMAGES = 50; @immutable class MyApp extends StatelessWidget { const MyApp(this.port, {super.key}); final int port; @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, ), home: MyHomePage(title: 'Flutter Demo Home Page', port: port), ); } } class MyHomePage extends StatefulWidget { const MyHomePage({super.key, required this.title, required this.port}); final String title; final int port; @override State<MyHomePage> createState() => _MyHomePageState(); } class _MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin { int _counter = 0; void _incrementCounter() { setState(() { _counter++; }); } Widget createImage(final int index, final Completer<bool> completer) { return Image.network( 'https://localhost:${widget.port}/${_counter * IMAGES + index}', frameBuilder: ( BuildContext context, Widget child, int? frame, bool wasSynchronouslyLoaded, ) { if (frame == 0 && !completer.isCompleted) { completer.complete(true); } return child; }, ); } @override Widget build(BuildContext context) { final List<AnimationController> controllers = <AnimationController>[ for (int i = 0; i < IMAGES; i++) AnimationController( duration: const Duration(milliseconds: 3600), vsync: this, )..repeat(), ]; final List<Completer<bool>> completers = <Completer<bool>>[ for (int i = 0; i < IMAGES; i++) Completer<bool>(), ]; final List<Future<bool>> futures = completers.map( (Completer<bool> completer) => completer.future, ).toList(); final DateTime started = DateTime.now(); Future.wait(futures).then((_) { debugPrint( '===image_list=== all loaded in ${DateTime.now().difference(started).inMilliseconds}ms.', ); }); return Scaffold( appBar: AppBar( title: Text(widget.title), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Row(children: createImageList(IMAGES, completers, controllers)), const Text( 'You have pushed the button this many times:', ), Text( '$_counter', style: Theme.of(context).textTheme.headlineMedium, ), ], ), ), floatingActionButton: FloatingActionButton( onPressed: _incrementCounter, tooltip: 'Increment', child: const Icon(Icons.add), ), ); } List<Widget> createImageList( int count, List<Completer<bool>> completers, List<AnimationController> controllers, ) { final List<Widget> list = <Widget>[]; for (int i = 0; i < count; i++) { list.add(Flexible( fit: FlexFit.tight, flex: i + 1, child: RotationTransition( turns: controllers[i], child: createImage(i + 1, completers[i]), ), )); } return list; } }