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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/widgets.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('restartAndRestore', (WidgetTester tester) async {
await tester.pumpWidget(
const RootRestorationScope(
restorationId: 'root-child',
child: _RestorableWidget(
restorationId: 'restorable-widget',
),
),
);
final _RestorableWidgetState state = tester.state(find.byType(_RestorableWidget));
expect(find.text('Hello World 100'), findsOneWidget);
expect(state.doubleValue, 1.0);
state.setValues('Guten Morgen', 200, 33.4);
await tester.pump();
expect(find.text('Guten Morgen 200'), findsOneWidget);
expect(state.doubleValue, 33.4);
await tester.restartAndRestore();
expect(find.text('Guten Morgen 200'), findsOneWidget);
expect(find.text('Hello World 100'), findsNothing);
final _RestorableWidgetState restoredState = tester.state(find.byType(_RestorableWidget));
expect(restoredState, isNot(same(state)));
expect(restoredState.doubleValue, 1.0);
});
testWidgets('restore from previous restoration data', (WidgetTester tester) async {
await tester.pumpWidget(
const RootRestorationScope(
restorationId: 'root-child',
child: _RestorableWidget(
restorationId: 'restorable-widget',
),
),
);
final _RestorableWidgetState state = tester.state(find.byType(_RestorableWidget));
expect(find.text('Hello World 100'), findsOneWidget);
expect(state.doubleValue, 1.0);
state.setValues('Guten Morgen', 200, 33.4);
await tester.pump();
expect(find.text('Guten Morgen 200'), findsOneWidget);
expect(state.doubleValue, 33.4);
final TestRestorationData data = await tester.getRestorationData();
state.setValues('See you later!', 400, 123.5);
await tester.pump();
expect(find.text('See you later! 400'), findsOneWidget);
expect(state.doubleValue, 123.5);
await tester.restoreFrom(data);
expect(tester.state(find.byType(_RestorableWidget)), same(state));
expect(find.text('Guten Morgen 200'), findsOneWidget);
expect(state.doubleValue, 123.5);
});
}
class _RestorableWidget extends StatefulWidget {
const _RestorableWidget({this.restorationId});
final String? restorationId;
@override
State<_RestorableWidget> createState() => _RestorableWidgetState();
}
class _RestorableWidgetState extends State<_RestorableWidget> with RestorationMixin {
final RestorableString stringValue = RestorableString('Hello World');
final RestorableInt intValue = RestorableInt(100);
double doubleValue = 1.0; // Not restorable.
@override
void restoreState(RestorationBucket? oldBucket, bool initialRestore) {
registerForRestoration(stringValue, 'string');
registerForRestoration(intValue, 'int');
}
void setValues(String s, int i, double d) {
setState(() {
stringValue.value = s;
intValue.value = i;
doubleValue = d;
});
}
@override
Widget build(BuildContext context) {
return Text('${stringValue.value} ${intValue.value}', textDirection: TextDirection.ltr);
}
@override
String? get restorationId => widget.restorationId;
}