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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/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:intl/intl.dart' as intl;
class FooMaterialLocalizations extends MaterialLocalizationEn {
FooMaterialLocalizations(
Locale localeName,
this.backButtonTooltip,
) : super(
localeName: localeName.toString(),
fullYearFormat: intl.DateFormat.y(),
compactDateFormat: intl.DateFormat.yMd(),
shortDateFormat: intl.DateFormat.yMMMd(),
mediumDateFormat: intl.DateFormat('E, MMM\u00a0d'),
longDateFormat: intl.DateFormat.yMMMMEEEEd(),
yearMonthFormat: intl.DateFormat.yMMMM(),
shortMonthDayFormat: intl.DateFormat.MMMd(),
decimalFormat: intl.NumberFormat.decimalPattern(),
twoDigitZeroPaddedFormat: intl.NumberFormat('00'),
);
@override
final String backButtonTooltip;
}
class FooMaterialLocalizationsDelegate extends LocalizationsDelegate<MaterialLocalizations> {
const FooMaterialLocalizationsDelegate({
this.supportedLanguage = 'en',
this.backButtonTooltip = 'foo',
});
final String supportedLanguage;
final String backButtonTooltip;
@override
bool isSupported(Locale locale) {
return supportedLanguage == 'allLanguages' || locale.languageCode == supportedLanguage;
}
@override
Future<FooMaterialLocalizations> load(Locale locale) {
return SynchronousFuture<FooMaterialLocalizations>(FooMaterialLocalizations(locale, backButtonTooltip));
}
@override
bool shouldReload(FooMaterialLocalizationsDelegate old) => false;
}
Widget buildFrame({
Locale? locale,
Iterable<LocalizationsDelegate<dynamic>> delegates = GlobalMaterialLocalizations.delegates,
required WidgetBuilder buildContent,
LocaleResolutionCallback? localeResolutionCallback,
Iterable<Locale> supportedLocales = const <Locale>[
Locale('en', 'US'),
Locale('es', 'ES'),
],
}) {
return MaterialApp(
color: const Color(0xFFFFFFFF),
locale: locale,
supportedLocales: supportedLocales,
localizationsDelegates: delegates,
localeResolutionCallback: localeResolutionCallback,
onGenerateRoute: (RouteSettings settings) {
return MaterialPageRoute<void>(
builder: (BuildContext context) {
return buildContent(context);
}
);
},
);
}
void main() {
testWidgets('Locale fallbacks', (WidgetTester tester) async {
final Key textKey = UniqueKey();
await tester.pumpWidget(
buildFrame(
buildContent: (BuildContext context) {
return Text(
MaterialLocalizations.of(context).backButtonTooltip,
key: textKey,
);
}
)
);
expect(tester.widget<Text>(find.byKey(textKey)).data, 'Back');
// Unrecognized locale falls back to 'en'
await tester.binding.setLocale('foo', 'BAR');
await tester.pump();
expect(tester.widget<Text>(find.byKey(textKey)).data, 'Back');
// Spanish Bolivia locale, falls back to just 'es'
await tester.binding.setLocale('es', 'BO');
await tester.pump();
expect(tester.widget<Text>(find.byKey(textKey)).data, 'Atrás');
});
testWidgets("Localizations.override widget tracks parent's locale", (WidgetTester tester) async {
Widget buildLocaleFrame(Locale locale) {
return buildFrame(
locale: locale,
supportedLocales: <Locale>[locale],
buildContent: (BuildContext context) {
return Localizations.override(
context: context,
child: Builder(
builder: (BuildContext context) {
// No MaterialLocalizations are defined for the first Localizations
// ancestor, so we should get the values from the default one, i.e.
// the one created by WidgetsApp via the LocalizationsDelegate
// provided by MaterialApp.
return Text(MaterialLocalizations.of(context).backButtonTooltip);
},
),
);
},
);
}
await tester.pumpWidget(buildLocaleFrame(const Locale('en', 'US')));
expect(find.text('Back'), findsOneWidget);
await tester.pumpWidget(buildLocaleFrame(const Locale('de', 'DE')));
expect(find.text('Zurück'), findsOneWidget);
await tester.pumpWidget(buildLocaleFrame(const Locale('zh', 'CN')));
expect(find.text('返回'), findsOneWidget);
});
testWidgets('Localizations.override widget with hardwired locale', (WidgetTester tester) async {
Widget buildLocaleFrame(Locale locale) {
return buildFrame(
locale: locale,
buildContent: (BuildContext context) {
return Localizations.override(
context: context,
locale: const Locale('en', 'US'),
child: Builder(
builder: (BuildContext context) {
// No MaterialLocalizations are defined for the Localizations.override
// ancestor, so we should get all values from the default one, i.e.
// the one created by WidgetsApp via the LocalizationsDelegate
// provided by MaterialApp.
return Text(MaterialLocalizations.of(context).backButtonTooltip);
},
),
);
},
);
}
await tester.pumpWidget(buildLocaleFrame(const Locale('en', 'US')));
expect(find.text('Back'), findsOneWidget);
await tester.pumpWidget(buildLocaleFrame(const Locale('de', 'DE')));
expect(find.text('Back'), findsOneWidget);
await tester.pumpWidget(buildLocaleFrame(const Locale('zh', 'CN')));
expect(find.text('Back'), findsOneWidget);
});
testWidgets('MaterialApp adds MaterialLocalizations for additional languages', (WidgetTester tester) async {
final Key textKey = UniqueKey();
await tester.pumpWidget(
buildFrame(
delegates: <LocalizationsDelegate<dynamic>>[
const FooMaterialLocalizationsDelegate(supportedLanguage: 'fr', backButtonTooltip: 'FR'),
const FooMaterialLocalizationsDelegate(supportedLanguage: 'de', backButtonTooltip: 'DE'),
GlobalCupertinoLocalizations.delegate,
],
supportedLocales: const <Locale>[
Locale('en'),
Locale('fr'),
Locale('de'),
],
buildContent: (BuildContext context) {
return Text(
MaterialLocalizations.of(context).backButtonTooltip,
key: textKey,
);
},
)
);
expect(tester.widget<Text>(find.byKey(textKey)).data, 'Back');
await tester.binding.setLocale('fr', 'CA');
await tester.pump();
expect(find.text('FR'), findsOneWidget);
await tester.binding.setLocale('de', 'DE');
await tester.pump();
expect(find.text('DE'), findsOneWidget);
});
testWidgets('MaterialApp overrides MaterialLocalizations for all locales', (WidgetTester tester) async {
final Key textKey = UniqueKey();
await tester.pumpWidget(
buildFrame(
// Accept whatever locale we're given
localeResolutionCallback: (Locale? locale, Iterable<Locale> supportedLocales) => locale,
delegates: <LocalizationsDelegate<dynamic>>[
const FooMaterialLocalizationsDelegate(supportedLanguage: 'allLanguages'),
GlobalCupertinoLocalizations.delegate,
],
buildContent: (BuildContext context) {
// Should always be 'foo', no matter what the locale is
return Text(
MaterialLocalizations.of(context).backButtonTooltip,
key: textKey,
);
},
)
);
expect(tester.widget<Text>(find.byKey(textKey)).data, 'foo');
await tester.binding.setLocale('zh', 'CN');
await tester.pump();
expect(find.text('foo'), findsOneWidget);
await tester.binding.setLocale('de', 'DE');
await tester.pump();
expect(find.text('foo'), findsOneWidget);
});
testWidgets('MaterialApp overrides MaterialLocalizations for default locale', (WidgetTester tester) async {
final Key textKey = UniqueKey();
await tester.pumpWidget(
buildFrame(
delegates: <LocalizationsDelegate<dynamic>>[
const FooMaterialLocalizationsDelegate(),
GlobalCupertinoLocalizations.delegate,
],
// supportedLocales not specified, so all locales resolve to 'en'
buildContent: (BuildContext context) {
return Text(
MaterialLocalizations.of(context).backButtonTooltip,
key: textKey,
);
},
)
);
// Unsupported locale '_' (the widget tester's default) resolves to 'en'.
expect(tester.widget<Text>(find.byKey(textKey)).data, 'foo');
// Unsupported locale 'zh' resolves to 'en'.
await tester.binding.setLocale('zh', 'CN');
await tester.pump();
expect(find.text('foo'), findsOneWidget);
// Unsupported locale 'de' resolves to 'en'.
await tester.binding.setLocale('de', 'DE');
await tester.pump();
expect(find.text('foo'), findsOneWidget);
});
testWidgets('deprecated Android/Java locales are modernized', (WidgetTester tester) async {
final Key textKey = UniqueKey();
await tester.pumpWidget(
buildFrame(
supportedLocales: <Locale>[
const Locale('en', 'US'),
const Locale('he', 'IL'),
const Locale('yi', 'IL'),
const Locale('id', 'JV'),
],
buildContent: (BuildContext context) {
return Text(
'${Localizations.localeOf(context)}',
key: textKey,
);
},
)
);
expect(tester.widget<Text>(find.byKey(textKey)).data, 'en_US');
// Hebrew was iw (ISO-639) is he (ISO-639-1)
await tester.binding.setLocale('iw', 'IL');
await tester.pump();
expect(tester.widget<Text>(find.byKey(textKey)).data, 'he_IL');
// Yiddish was ji (ISO-639) is yi (ISO-639-1)
await tester.binding.setLocale('ji', 'IL');
await tester.pump();
expect(tester.takeException(), "Warning: This application's locale, yi_IL, is not supported by all of its localization delegates.");
expect(tester.widget<Text>(find.byKey(textKey)).data, 'yi_IL');
// Indonesian was in (ISO-639) is id (ISO-639-1)
await tester.binding.setLocale('in', 'JV');
await tester.pump();
expect(tester.widget<Text>(find.byKey(textKey)).data, 'id_JV');
});
}