// 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 '../test_utils.dart'; import 'project.dart'; class HotReloadProject extends Project { HotReloadProject({super.indexHtml}); @override final String pubspec = ''' name: test environment: sdk: '>=3.2.0-0 <4.0.0' dependencies: flutter: sdk: flutter '''; @override final String main = r''' import 'package:flutter/material.dart'; import 'package:flutter/scheduler.dart'; import 'package:flutter/services.dart'; import 'package:flutter/widgets.dart'; import 'package:flutter/foundation.dart'; void main() async { WidgetsFlutterBinding.ensureInitialized(); final ByteData message = const StringCodec().encodeMessage('AppLifecycleState.resumed')!; await ServicesBinding.instance!.defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { }); // See https://github.com/flutter/flutter/issues/86202 if (kIsWeb) { while (true) { runApp(MyApp()); await Future.delayed(const Duration(seconds: 1)); } } else { runApp(MyApp()); } } int count = 1; class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { // This method gets called each time we hot reload, during reassemble. // Do not remove the next line, it's uncommented by a test to verify that // hot reloading worked: // printHotReloadWorked(); print('((((TICK $count))))'); // tick 1 = startup warmup frame // tick 2 = hot reload warmup reassemble frame // after that there's a post-hot-reload frame scheduled by the tool that // doesn't trigger this to rebuild, but does trigger the first callback // below, then that callback schedules another frame on which we do the // breakpoint. // tick 3 = second hot reload warmup reassemble frame (pre breakpoint) if (count == 2) { SchedulerBinding.instance!.scheduleFrameCallback((Duration timestamp) { SchedulerBinding.instance!.scheduleFrameCallback((Duration timestamp) { print('breakpoint line'); // SCHEDULED BREAKPOINT }); }); } count += 1; return MaterialApp( // BUILD BREAKPOINT title: 'Flutter Demo', home: Container(), ); } } void printHotReloadWorked() { // The call to this function is uncommented by a test to verify that hot // reloading worked. print('(((((RELOAD WORKED)))))'); } '''; Uri get scheduledBreakpointUri => mainDart; int get scheduledBreakpointLine => lineContaining(main, '// SCHEDULED BREAKPOINT'); Uri get buildBreakpointUri => mainDart; int get buildBreakpointLine => lineContaining(main, '// BUILD BREAKPOINT'); void uncommentHotReloadPrint() { final String newMainContents = main.replaceAll( '// printHotReloadWorked();', 'printHotReloadWorked();', ); writeFile( fileSystem.path.join(dir.path, 'lib', 'main.dart'), newMainContents, writeFutureModifiedDate: true, ); } }