1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
// 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/material.dart';
/// Flutter code sample for [RestorableRouteFuture].
void main() => runApp(const RestorableRouteFutureExampleApp());
class RestorableRouteFutureExampleApp extends StatelessWidget {
const RestorableRouteFutureExampleApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
restorationScopeId: 'app',
home: Scaffold(
appBar: AppBar(title: const Text('RestorableRouteFuture Example')),
body: const MyHome(),
),
);
}
}
class MyHome extends StatefulWidget {
const MyHome({super.key});
@override
State<MyHome> createState() => _MyHomeState();
}
class _MyHomeState extends State<MyHome> with RestorationMixin {
final RestorableInt _lastCount = RestorableInt(0);
late RestorableRouteFuture<int> _counterRoute;
@override
String get restorationId => 'home';
@override
void initState() {
super.initState();
_counterRoute = RestorableRouteFuture<int>(onPresent: (NavigatorState navigator, Object? arguments) {
// Defines what route should be shown (and how it should be added
// to the navigator) when `RestorableRouteFuture.present` is called.
return navigator.restorablePush(
_counterRouteBuilder,
arguments: arguments,
);
}, onComplete: (int count) {
// Defines what should happen with the return value when the route
// completes.
setState(() {
_lastCount.value = count;
});
});
}
@override
void restoreState(RestorationBucket? oldBucket, bool initialRestore) {
// Register the `RestorableRouteFuture` with the state restoration framework.
registerForRestoration(_counterRoute, 'route');
registerForRestoration(_lastCount, 'count');
}
@override
void dispose() {
super.dispose();
_lastCount.dispose();
_counterRoute.dispose();
}
// A static `RestorableRouteBuilder` that can re-create the route during
// state restoration.
@pragma('vm:entry-point')
static Route<int> _counterRouteBuilder(BuildContext context, Object? arguments) {
return MaterialPageRoute<int>(
builder: (BuildContext context) => MyCounter(
title: arguments!.toString(),
),
);
}
@override
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text('Last count: ${_lastCount.value}'),
ElevatedButton(
onPressed: () {
// Show the route defined by the `RestorableRouteFuture`.
_counterRoute.present('Awesome Counter');
},
child: const Text('Open Counter'),
),
],
),
);
}
}
// Widget for the route pushed by the `RestorableRouteFuture`.
class MyCounter extends StatefulWidget {
const MyCounter({super.key, required this.title});
final String title;
@override
State<MyCounter> createState() => _MyCounterState();
}
class _MyCounterState extends State<MyCounter> with RestorationMixin {
final RestorableInt _count = RestorableInt(0);
@override
String get restorationId => 'counter';
@override
void restoreState(RestorationBucket? oldBucket, bool initialRestore) {
registerForRestoration(_count, 'count');
}
@override
void dispose() {
super.dispose();
_count.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
leading: BackButton(
onPressed: () {
// Return the current count of the counter from this route.
Navigator.of(context).pop(_count.value);
},
),
),
body: Center(
child: Text('Count: ${_count.value}'),
),
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.add),
onPressed: () {
setState(() {
_count.value++;
});
},
),
);
}
}