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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 'dart:async';
import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
/// Localized values for widgets.
///
/// Currently this class just maps [locale] to [textDirection]. All locales
/// are [TextDirection.ltr] except for locales with the following
/// [Locale.languageCode] values, which are [TextDirection.rtl]:
///
/// * ar - Arabic
/// * fa - Farsi
/// * he - Hebrew
/// * ps - Pashto
/// * sd - Sindhi
/// * ur - Urdu
class GlobalWidgetsLocalizations implements WidgetsLocalizations {
/// Construct an object that defines the localized values for the widgets
/// library for the given `locale`.
///
/// [LocalizationsDelegate] implementations typically call the static [load]
/// function, rather than constructing this class directly.
GlobalWidgetsLocalizations(this.locale) {
final String language = locale.languageCode.toLowerCase();
_textDirection = _rtlLanguages.contains(language) ? TextDirection.rtl : TextDirection.ltr;
}
// See http://en.wikipedia.org/wiki/Right-to-left
static const List<String> _rtlLanguages = <String>[
'ar', // Arabic
'fa', // Farsi
'he', // Hebrew
'ps', // Pashto
'ur', // Urdu
];
/// The locale for which the values of this class's localized resources
/// have been translated.
final Locale locale;
@override
TextDirection get textDirection => _textDirection;
TextDirection _textDirection;
/// Creates an object that provides localized resource values for the
/// lowest levels of the Flutter framework.
///
/// This method is typically used to create a [LocalizationsDelegate].
/// The [WidgetsApp] does so by default.
static Future<WidgetsLocalizations> load(Locale locale) {
return SynchronousFuture<WidgetsLocalizations>(GlobalWidgetsLocalizations(locale));
}
/// A [LocalizationsDelegate] that uses [GlobalWidgetsLocalizations.load]
/// to create an instance of this class.
///
/// [WidgetsApp] automatically adds this value to [WidgetApp.localizationsDelegates].
static const LocalizationsDelegate<WidgetsLocalizations> delegate = _WidgetsLocalizationsDelegate();
}
class _WidgetsLocalizationsDelegate extends LocalizationsDelegate<WidgetsLocalizations> {
const _WidgetsLocalizationsDelegate();
@override
bool isSupported(Locale locale) => true;
@override
Future<WidgetsLocalizations> load(Locale locale) => GlobalWidgetsLocalizations.load(locale);
@override
bool shouldReload(_WidgetsLocalizationsDelegate old) => false;
@override
String toString() => 'GlobalWidgetsLocalizations.delegate(all locales)';
}