84 lines
2.3 KiB
Dart
84 lines
2.3 KiB
Dart
import 'dart:convert';
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import 'package:flutter/services.dart';
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import 'package:flutter/material.dart';
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class AppLocalizations {
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static const chinese = Locale('zh', 'CN');
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static const english = Locale('en', 'US');
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static const supportedLocales = [chinese, english];
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static Locale localeForLanguage(String? languageCode) =>
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languageCode == 'zh' ? chinese : english;
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static final _placeholderPattern = RegExp(r'\{(\w+)\}');
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final Locale locale;
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Map<String, dynamic> _localizedStrings = {};
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AppLocalizations(this.locale);
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static AppLocalizations of(BuildContext context) {
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return Localizations.of<AppLocalizations>(context, AppLocalizations)!;
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}
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static const LocalizationsDelegate<AppLocalizations> delegate =
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_AppLocalizationsDelegate();
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Future<bool> load() async {
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try {
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final assetLocale = localeForLanguage(locale.languageCode);
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final jsonString = await rootBundle.loadString(
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'assets/languages/${assetLocale.toLanguageTag()}.json',
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);
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Map<String, dynamic> jsonMap = json.decode(jsonString);
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_localizedStrings = jsonMap;
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return true;
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} catch (e) {
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debugPrint('❌ [AppLocalizations] 加载语言文件失败: $e');
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return false;
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}
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}
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String translate(String key, [Map<String, Object?> values = const {}]) {
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final keys = key.split('.');
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dynamic value = _localizedStrings;
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for (final k in keys) {
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if (value is Map<String, dynamic>) {
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value = value[k];
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} else {
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return key;
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}
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}
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final text = value?.toString() ?? key;
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if (values.isEmpty) return text;
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return text.replaceAllMapped(
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_placeholderPattern,
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(match) => values[match[1]]?.toString() ?? match[0]!,
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);
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}
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}
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class _AppLocalizationsDelegate
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extends LocalizationsDelegate<AppLocalizations> {
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const _AppLocalizationsDelegate();
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@override
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bool isSupported(Locale locale) {
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return AppLocalizations.supportedLocales.any(
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(supported) => supported.languageCode == locale.languageCode,
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);
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}
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@override
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Future<AppLocalizations> load(Locale locale) async {
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final localizations = AppLocalizations(locale);
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await localizations.load();
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return localizations;
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}
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@override
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bool shouldReload(_AppLocalizationsDelegate old) => false;
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}
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