flutter/packages/flutter_localizations/lib/src/widgets_localizations.dart
Ian Hickson 449f4a6673
License update (#45373)
* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs
2019-11-27 15:04:02 -08:00

81 lines
2.7 KiB
Dart

// 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)';
}