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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/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('Nested Localizations', (WidgetTester tester) async {
await tester.pumpWidget(MaterialApp( // Creates the outer Localizations widget.
home: ListView(
children: <Widget>[
const LocalizationTracker(key: ValueKey<String>('outer')),
Localizations(
locale: const Locale('zh', 'CN'),
delegates: GlobalMaterialLocalizations.delegates,
child: const LocalizationTracker(key: ValueKey<String>('inner')),
),
],
),
));
final LocalizationTrackerState outerTracker = tester.state(find.byKey(const ValueKey<String>('outer'), skipOffstage: false));
expect(outerTracker.captionFontSize, 12.0);
final LocalizationTrackerState innerTracker = tester.state(find.byKey(const ValueKey<String>('inner'), skipOffstage: false));
expect(innerTracker.captionFontSize, 13.0);
});
testWidgets('Localizations is compatible with ChangeNotifier.dispose() called during didChangeDependencies', (WidgetTester tester) async {
// PageView calls ScrollPosition.dispose() during didChangeDependencies.
await tester.pumpWidget(
MaterialApp(
supportedLocales: const <Locale>[
Locale('en', 'US'),
Locale('es', 'ES'),
],
localizationsDelegates: <LocalizationsDelegate<dynamic>>[
_DummyLocalizationsDelegate(),
GlobalMaterialLocalizations.delegate,
],
home: PageView(),
)
);
await tester.binding.setLocale('es', 'US');
await tester.pump();
await tester.pumpWidget(Container());
});
testWidgets('Locale without coutryCode', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/pull/16782
await tester.pumpWidget(
MaterialApp(
localizationsDelegates: const <LocalizationsDelegate<dynamic>>[
GlobalMaterialLocalizations.delegate,
],
supportedLocales: const <Locale>[
Locale('es', 'ES'),
Locale('zh'),
],
home: Container(),
)
);
await tester.binding.setLocale('zh', null);
await tester.pump();
await tester.binding.setLocale('es', 'US');
await tester.pump();
});
}
/// A localizations delegate that does not contain any useful data, and is only
/// used to trigger didChangeDependencies upon locale change.
class _DummyLocalizationsDelegate extends LocalizationsDelegate<DummyLocalizations> {
@override
Future<DummyLocalizations> load(Locale locale) async => DummyLocalizations();
@override
bool isSupported(Locale locale) => true;
@override
bool shouldReload(_DummyLocalizationsDelegate old) => true;
}
class DummyLocalizations {}
class LocalizationTracker extends StatefulWidget {
const LocalizationTracker({Key key}) : super(key: key);
@override
State<StatefulWidget> createState() => LocalizationTrackerState();
}
class LocalizationTrackerState extends State<LocalizationTracker> {
double captionFontSize;
@override
Widget build(BuildContext context) {
captionFontSize = Theme.of(context).textTheme.caption.fontSize;
return Container();
}
}