Created
April 11, 2023 20:54
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Predictive back with go_router working without modifications to go_router
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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. | |
import 'package:flutter/scheduler.dart'; | |
import 'package:go_router/go_router.dart'; | |
import 'package:flutter/material.dart'; | |
import 'package:flutter/services.dart'; | |
void main() => runApp(_MyApp()); | |
class _MyApp extends StatefulWidget { | |
@override | |
State<_MyApp> createState() => _MyAppState(); | |
} | |
class _MyAppState extends State<_MyApp> { | |
final GoRouter _router = GoRouter( | |
routes: <RouteBase>[ | |
GoRoute( | |
path: '/', | |
builder: (BuildContext context, GoRouterState state) => _LinksPage( | |
title: 'Home page', | |
backgroundColor: Colors.indigo, | |
buttons: <Widget>[ | |
TextButton( | |
onPressed: () { | |
context.push('/one'); | |
}, | |
child: const Text('Go to one'), | |
), | |
], | |
), | |
), | |
GoRoute( | |
path: '/one', | |
builder: (BuildContext context, GoRouterState state) => _LinksPage( | |
title: 'Page one', | |
backgroundColor: Colors.indigo.withRed(255), | |
buttons: <Widget>[ | |
TextButton( | |
onPressed: () { | |
context.push('/one/two'); | |
}, | |
child: const Text('Go to one/two'), | |
), | |
], | |
), | |
), | |
GoRoute( | |
path: '/one/two', | |
builder: (BuildContext context, GoRouterState state) => _LinksPage( | |
title: 'Page one/two', | |
backgroundColor: Colors.indigo.withBlue(255), | |
), | |
), | |
], | |
); | |
void _routerChanged() { | |
SchedulerBinding.instance.addPostFrameCallback((Duration duration) { | |
SystemNavigator.updateNavigationStackStatus(_router.canPop()); | |
}); | |
} | |
@override | |
void initState() { | |
super.initState(); | |
_router.addListener(_routerChanged); | |
} | |
@override | |
void dispose() { | |
_router.removeListener(_routerChanged); | |
super.dispose(); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return MaterialApp.router( | |
routerConfig: _router, | |
); | |
} | |
} | |
class _LinksPage extends StatelessWidget { | |
const _LinksPage ({ | |
required this.backgroundColor, | |
this.buttons = const <Widget>[], | |
this.onBack, | |
required this.title, | |
}); | |
final Color backgroundColor; | |
final List<Widget> buttons; | |
final VoidCallback? onBack; | |
final String title; | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
backgroundColor: backgroundColor, | |
body: Center( | |
child: Column( | |
mainAxisAlignment: MainAxisAlignment.center, | |
children: <Widget>[ | |
Text(title), | |
...buttons, | |
if (GoRouter.of(context).canPop()) | |
TextButton( | |
onPressed: onBack ?? () { | |
context.pop(); | |
}, | |
child: const Text('Go back'), | |
), | |
], | |
), | |
), | |
); | |
} | |
} |
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