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新增 Flutter weekly widget ValueListenableBuilder
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68 changes: 68 additions & 0 deletions
68
...roject/example/flutter_widget_of_the_week/lib/widget/week30_value_listenable_builder.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| import 'package:flutter/material.dart'; | ||
|
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| class Week30 extends StatelessWidget { | ||
| final ValueNotifier<int> _counter = ValueNotifier(0); | ||
| final ColorProvider _colorProvider = ColorProvider(ColorModel()); | ||
|
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| @override | ||
| Widget build(BuildContext context) { | ||
| return Scaffold( | ||
| body: Center( | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| crossAxisAlignment: CrossAxisAlignment.center, | ||
| children: <Widget>[ | ||
| ValueListenableBuilder( | ||
| valueListenable: _counter, | ||
| builder: (context, int value, _) { | ||
| return Text('current counter is : $value'); | ||
| }), | ||
| ValueListenableBuilder<ColorModel>( | ||
| valueListenable: _colorProvider, | ||
| builder: (context, model, _) { | ||
| return Container( | ||
| height: 100, | ||
| width: 100, | ||
| color: model.color, | ||
| ); | ||
| }, | ||
| ), | ||
| ], | ||
| ), | ||
| ), | ||
| floatingActionButton: FloatingActionButton(onPressed: () { | ||
| _counter.value++; | ||
| _colorProvider.changeColor(); | ||
| }), | ||
| ); | ||
| } | ||
| } | ||
|
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| class ColorModel { | ||
| final List<Color> _colors = [ | ||
| Colors.redAccent, | ||
| Colors.lightGreen, | ||
| Colors.pinkAccent, | ||
| Colors.tealAccent, | ||
| Colors.blue, | ||
| ]; | ||
| int _currentColor = 0; | ||
|
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| get color => _colors[_currentColor]; | ||
|
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| changeColor() { | ||
| if (_currentColor != _colors.length - 1) | ||
| _currentColor++; | ||
| else | ||
| _currentColor = 0; | ||
| } | ||
| } | ||
|
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| class ColorProvider extends ValueNotifier<ColorModel> { | ||
| ColorProvider(ColorModel value) : super(value); | ||
|
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| changeColor() { | ||
| value.changeColor(); | ||
| notifyListeners(); | ||
| } | ||
| } |
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122 changes: 122 additions & 0 deletions
122
mecury_project/example/provider_example/lib/generated/i18n.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| import 'dart:async'; | ||
|
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| import 'package:flutter/foundation.dart'; | ||
| import 'package:flutter/material.dart'; | ||
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| // ignore_for_file: non_constant_identifier_names | ||
| // ignore_for_file: camel_case_types | ||
| // ignore_for_file: prefer_single_quotes | ||
|
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| // This file is automatically generated. DO NOT EDIT, all your changes would be lost. | ||
| class S implements WidgetsLocalizations { | ||
| const S(); | ||
|
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| static const GeneratedLocalizationsDelegate delegate = | ||
| GeneratedLocalizationsDelegate(); | ||
|
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| static S of(BuildContext context) => Localizations.of<S>(context, S); | ||
|
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| @override | ||
| TextDirection get textDirection => TextDirection.ltr; | ||
|
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| } | ||
|
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| class $en extends S { | ||
| const $en(); | ||
| } | ||
|
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| class GeneratedLocalizationsDelegate extends LocalizationsDelegate<S> { | ||
| const GeneratedLocalizationsDelegate(); | ||
|
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| List<Locale> get supportedLocales { | ||
| return const <Locale>[ | ||
| Locale("en", ""), | ||
| ]; | ||
| } | ||
|
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| LocaleListResolutionCallback listResolution({Locale fallback, bool withCountry = true}) { | ||
| return (List<Locale> locales, Iterable<Locale> supported) { | ||
| if (locales == null || locales.isEmpty) { | ||
| return fallback ?? supported.first; | ||
| } else { | ||
| return _resolve(locales.first, fallback, supported, withCountry); | ||
| } | ||
| }; | ||
| } | ||
|
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| LocaleResolutionCallback resolution({Locale fallback, bool withCountry = true}) { | ||
| return (Locale locale, Iterable<Locale> supported) { | ||
| return _resolve(locale, fallback, supported, withCountry); | ||
| }; | ||
| } | ||
|
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| @override | ||
| Future<S> load(Locale locale) { | ||
| final String lang = getLang(locale); | ||
| if (lang != null) { | ||
| switch (lang) { | ||
| case "en": | ||
| return SynchronousFuture<S>(const $en()); | ||
| default: | ||
| // NO-OP. | ||
| } | ||
| } | ||
| return SynchronousFuture<S>(const S()); | ||
| } | ||
|
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| @override | ||
| bool isSupported(Locale locale) => _isSupported(locale, true); | ||
|
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| @override | ||
| bool shouldReload(GeneratedLocalizationsDelegate old) => false; | ||
|
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| /// | ||
| /// Internal method to resolve a locale from a list of locales. | ||
| /// | ||
| Locale _resolve(Locale locale, Locale fallback, Iterable<Locale> supported, bool withCountry) { | ||
| if (locale == null || !_isSupported(locale, withCountry)) { | ||
| return fallback ?? supported.first; | ||
| } | ||
|
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| final Locale languageLocale = Locale(locale.languageCode, ""); | ||
| if (supported.contains(locale)) { | ||
| return locale; | ||
| } else if (supported.contains(languageLocale)) { | ||
| return languageLocale; | ||
| } else { | ||
| final Locale fallbackLocale = fallback ?? supported.first; | ||
| return fallbackLocale; | ||
| } | ||
| } | ||
|
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| /// | ||
| /// Returns true if the specified locale is supported, false otherwise. | ||
| /// | ||
| bool _isSupported(Locale locale, bool withCountry) { | ||
| if (locale != null) { | ||
| for (Locale supportedLocale in supportedLocales) { | ||
| // Language must always match both locales. | ||
| if (supportedLocale.languageCode != locale.languageCode) { | ||
| continue; | ||
| } | ||
|
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| // If country code matches, return this locale. | ||
| if (supportedLocale.countryCode == locale.countryCode) { | ||
| return true; | ||
| } | ||
|
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| // If no country requirement is requested, check if this locale has no country. | ||
| if (true != withCountry && (supportedLocale.countryCode == null || supportedLocale.countryCode.isEmpty)) { | ||
| return true; | ||
| } | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
| } | ||
|
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| String getLang(Locale l) => l == null | ||
| ? null | ||
| : l.countryCode != null && l.countryCode.isEmpty | ||
| ? l.languageCode | ||
| : l.toString(); |
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