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Change flutter Theme using valueNotifier

Enchanting Eland answered on April 5, 2023 Popularity 1/10 Helpfulness 1/10

answer Change flutter Theme using valueNotifier

Change flutter Theme using valueNotifier

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import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

final darkNotifier = ValueNotifier<bool>(false);

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ValueListenableBuilder<bool>(
        valueListenable: darkNotifier,
        builder: (BuildContext context, bool isDark, Widget? child) {
          return MaterialApp(
            title: 'Flutter Demo',
            themeMode: isDark ? ThemeMode.dark : ThemeMode.light,
            theme: ThemeData(primaryColor: Colors.blue),
            darkTheme: ThemeData.dark(),
            home: MyHomePage(
              title: 'Homepage',
            ),
          );
        });
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  void dispose() {
    // TODO: implement dispose
    darkNotifier.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    bool isDark = darkNotifier.value;
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              _darkNotifier.value ? 'DarkMode' : 'LightMode',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          isDark = !isDark;
          darkNotifier.value = isDark;
        },
        tooltip: 'Increment',
        child: Icon(isDark ? Icons.wb_sunny_outlined : Icons.bubble_chart),
      ),
    );
  }
}

Popularity 1/10 Helpfulness 1/10 Language whatever

Source: stackoverflow.com

Tags: flutter-theme using whatever

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Contributed on Apr 05 2023

Enchanting Eland

0 Answers Avg Quality 2/10

Change flutter Theme using valueNotifier

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