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same as previous but with soft transition on modalroute ## Pre-launch Checklist - [ ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [ ] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [ ] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [ ] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [ ] I updated/added relevant documentation (doc comments with `///`). - [ ] I added new tests to check the change I am making, or this PR is [test-exempt]. - [ ] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [ ] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/wiki/Tree-hygiene#overview [Tree Hygiene]: https://github.com/flutter/flutter/wiki/Tree-hygiene [test-exempt]: https://github.com/flutter/flutter/wiki/Tree-hygiene#tests [Flutter Style Guide]: https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo [Features we expect every widget to implement]: https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/wiki/Tree-hygiene#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/wiki/Chat [Data Driven Fixes]: https://github.com/flutter/flutter/wiki/Data-driven-Fixes
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| // 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. | ||
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| // This sample demonstrates how to use a PopScope to wrap a widget that | ||
| // may pop the page with a result. | ||
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| import 'package:flutter/material.dart'; | ||
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| void main() => runApp(const NavigatorPopHandlerApp()); | ||
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| class NavigatorPopHandlerApp extends StatelessWidget { | ||
| const NavigatorPopHandlerApp({super.key}); | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return MaterialApp( | ||
| initialRoute: '/home', | ||
| onGenerateRoute: (RouteSettings settings) { | ||
| return switch (settings.name) { | ||
| '/two' => MaterialPageRoute<FormData>( | ||
| builder: (BuildContext context) => const _PageTwo(), | ||
| ), | ||
| _ => MaterialPageRoute<void>( | ||
| builder: (BuildContext context) => const _HomePage(), | ||
| ), | ||
| }; | ||
| }, | ||
| ); | ||
| } | ||
| } | ||
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| class _HomePage extends StatefulWidget { | ||
| const _HomePage(); | ||
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| @override | ||
| State<_HomePage> createState() => _HomePageState(); | ||
| } | ||
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| class _HomePageState extends State<_HomePage> { | ||
| FormData? _formData; | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return Scaffold( | ||
| body: Center( | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: <Widget>[ | ||
| const Text('Page One'), | ||
| if (_formData != null) | ||
| Text('Hello ${_formData!.name}, whose favorite food is ${_formData!.favoriteFood}.'), | ||
| TextButton( | ||
| onPressed: () async { | ||
| final FormData formData = | ||
| await Navigator.of(context).pushNamed<FormData?>('/two') | ||
| ?? const FormData(); | ||
| if (formData != _formData) { | ||
| setState(() { | ||
| _formData = formData; | ||
| }); | ||
| } | ||
| }, | ||
| child: const Text('Next page'), | ||
| ), | ||
| ], | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
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| class _PopScopeWrapper extends StatelessWidget { | ||
| const _PopScopeWrapper({required this.child}); | ||
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| final Widget child; | ||
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| Future<bool?> _showBackDialog(BuildContext context) { | ||
| return showDialog<bool>( | ||
| context: context, | ||
| builder: (BuildContext context) { | ||
| return AlertDialog( | ||
| title: const Text('Are you sure?'), | ||
| content: const Text( | ||
| 'Are you sure you want to leave this page?', | ||
| ), | ||
| actions: <Widget>[ | ||
| TextButton( | ||
| style: TextButton.styleFrom( | ||
| textStyle: Theme.of(context).textTheme.labelLarge, | ||
| ), | ||
| child: const Text('Never mind'), | ||
| onPressed: () { | ||
| Navigator.pop(context, false); | ||
| }, | ||
| ), | ||
| TextButton( | ||
| style: TextButton.styleFrom( | ||
| textStyle: Theme.of(context).textTheme.labelLarge, | ||
| ), | ||
| child: const Text('Leave'), | ||
| onPressed: () { | ||
| Navigator.pop(context, true); | ||
| }, | ||
| ), | ||
| ], | ||
| ); | ||
| }, | ||
| ); | ||
| } | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return PopScope<FormData>( | ||
| canPop: false, | ||
| // The result argument contains the pop result that is defined in `_PageTwo`. | ||
| onPopInvokedWithResult: (bool didPop, FormData? result) async { | ||
| if (didPop) { | ||
| return; | ||
| } | ||
| final bool shouldPop = await _showBackDialog(context) ?? false; | ||
| if (context.mounted && shouldPop) { | ||
| Navigator.pop(context, result); | ||
| } | ||
| }, | ||
| child: child, | ||
| ); | ||
| } | ||
| } | ||
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| // This is a PopScope wrapper over _PageTwoBody | ||
| class _PageTwo extends StatelessWidget { | ||
| const _PageTwo(); | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return const _PopScopeWrapper( | ||
| child: _PageTwoBody(), | ||
| ); | ||
| } | ||
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| } | ||
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| class _PageTwoBody extends StatefulWidget { | ||
| const _PageTwoBody(); | ||
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| @override | ||
| State<_PageTwoBody> createState() => _PageTwoBodyState(); | ||
| } | ||
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| class _PageTwoBodyState extends State<_PageTwoBody> { | ||
| FormData _formData = const FormData(); | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return Scaffold( | ||
| body: Center( | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: <Widget>[ | ||
| const Text('Page Two'), | ||
| Form( | ||
| child: Column( | ||
| children: <Widget>[ | ||
| TextFormField( | ||
| decoration: const InputDecoration( | ||
| hintText: 'Enter your name.', | ||
| ), | ||
| onChanged: (String value) { | ||
| _formData = _formData.copyWith( | ||
| name: value, | ||
| ); | ||
| }, | ||
| ), | ||
| TextFormField( | ||
| decoration: const InputDecoration( | ||
| hintText: 'Enter your favorite food.', | ||
| ), | ||
| onChanged: (String value) { | ||
| _formData = _formData.copyWith( | ||
| favoriteFood: value, | ||
| ); | ||
| }, | ||
| ), | ||
| ], | ||
| ), | ||
| ), | ||
| TextButton( | ||
| onPressed: () async { | ||
| Navigator.maybePop(context, _formData); | ||
| }, | ||
| child: const Text('Go back'), | ||
| ), | ||
| ], | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
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| @immutable | ||
| class FormData { | ||
| const FormData({ | ||
| this.name = '', | ||
| this.favoriteFood = '', | ||
| }); | ||
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| final String name; | ||
| final String favoriteFood; | ||
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| FormData copyWith({String? name, String? favoriteFood}) { | ||
| return FormData( | ||
| name: name ?? this.name, | ||
| favoriteFood: favoriteFood ?? this.favoriteFood, | ||
| ); | ||
| } | ||
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| @override | ||
| bool operator ==(Object other) { | ||
| if (identical(this, other)) { | ||
| return true; | ||
| } | ||
| if (other.runtimeType != runtimeType) { | ||
| return false; | ||
| } | ||
| return other is FormData | ||
| && other.name == name | ||
| && other.favoriteFood == favoriteFood; | ||
| } | ||
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| @override | ||
| int get hashCode => Object.hash(name, favoriteFood); | ||
| } |
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