109 lines
2.8 KiB
Dart
109 lines
2.8 KiB
Dart
import 'dart:convert';
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import 'package:features/features.dart';
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import 'package:flutter/material.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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void main() => runApp(MyApp());
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class MyApp extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Flutter Demo',
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debugShowCheckedModeBanner: false,
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theme: ThemeData(primarySwatch: Colors.blue),
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darkTheme: ThemeData.dark(),
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home: MyHomePage(title: 'Flutter Demo Home Page'),
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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MyHomePage({Key? key, this.title}) : super(key: key);
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final String? title;
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@override
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_MyHomePageState createState() => _MyHomePageState();
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}
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class _MyHomePageState extends State<MyHomePage> {
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int _counter = 0;
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final _counterFeature = Feature('counter'); //..defaultValue(false)
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late SharedPreferences _prefs;
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@override
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void initState() {
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SharedPreferences.getInstance().then((prefs) {
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_prefs = prefs;
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_restoreFromCache();
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});
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super.initState();
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}
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void _restoreFromCache() {
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final _savedCache = _prefs.getString('cache');
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final Map<String, dynamic> _cache = json.decode(_savedCache ?? '{}');
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_counterFeature.enabled = _cache[_counterFeature.key];
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}
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void _saveToCache() {
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final _cache = <String, dynamic>{};
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_cache[_counterFeature.key] = _counterFeature.enabled;
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_prefs.setString('cache', json.encode(_cache));
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}
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void _incrementCounter() {
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if (mounted)
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setState(() {
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_counter++;
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});
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(title: Text(widget.title ?? '')),
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body: Center(
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child: Container(
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width: 250,
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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Text(
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'You have pushed the button this many times:',
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),
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Text(
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'$_counter',
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style: Theme.of(context).textTheme.headlineMedium,
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),
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FeatureBuilder(
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feature: _counterFeature,
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builder: (context, enabled, child) => SwitchListTile(
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title: Text('Enable Counter'),
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value: enabled,
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onChanged: (val) {
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_counterFeature.enabled = val;
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_saveToCache();
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},
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),
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),
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],
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),
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),
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),
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floatingActionButton: FeatureBuilder(
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feature: _counterFeature,
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hideOnInactive: true,
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builder: (context, enabled, child) => FloatingActionButton(
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onPressed: _incrementCounter,
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tooltip: 'Increment',
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child: Icon(Icons.add),
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),
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),
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);
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}
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}
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