app_locale_resolution.dart
1.28 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
import 'package:flutter/widgets.dart';
Locale resolveAppLocale(
Locale? deviceLocale, Iterable<Locale> supportedLocales) {
return const Locale('en');
if (deviceLocale == null) return const Locale('en');
for (final locale in supportedLocales) {
if (locale == deviceLocale) {
return locale;
}
}
if (deviceLocale.languageCode == 'zh') {
final script = deviceLocale.scriptCode?.toLowerCase();
final country = deviceLocale.countryCode?.toUpperCase();
final isHant = script == 'hant' ||
country == 'TW' ||
country == 'HK' ||
country == 'MO';
return supportedLocales.firstWhere(
(locale) =>
locale.languageCode == 'zh' &&
locale.scriptCode == (isHant ? 'Hant' : 'Hans'),
orElse: () => Locale.fromSubtags(
languageCode: 'zh',
scriptCode: isHant ? 'Hant' : 'Hans',
),
);
}
if (deviceLocale.countryCode != null) {
for (final locale in supportedLocales) {
if (locale.languageCode == deviceLocale.languageCode &&
locale.countryCode == deviceLocale.countryCode) {
return locale;
}
}
}
for (final locale in supportedLocales) {
if (locale.languageCode == deviceLocale.languageCode) {
return locale;
}
}
return const Locale('en');
}