adaptive_chameleon_theme 2024.8.1

Adds support for managing theme modes (light, dark, system) and switching theme colors.

example/lib/main.dart

import 'package:adaptive_chameleon_theme/adaptive_chameleon_theme.dart';
import 'package:example/themes.dart';
import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return AdaptiveChameleonThemeWidget(
      themeCollection: AppThemes.themeCollection,
      darkThemeCollection: AppThemes.darkThemeCollection,
      defaultThemeId: AppThemes.aokiji,
      builder: (context, theme, darkTheme, themeMode) {
        return MaterialApp(
          title: 'Flutter Demo',
          theme: theme,
          darkTheme: darkTheme,
          themeMode: themeMode,
          home: const MyHomePage(title: 'Adaptive Chameleon Theme'),
        );
      },
    );
  }
}

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

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int dropdownValue = 0;
  ThemeMode themeModeDropdownValue = ThemeMode.system;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    dropdownValue = AdaptiveChameleonTheme.of(context).themeId;
    themeModeDropdownValue = AdaptiveChameleonTheme.of(context).themeMode!;

    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Padding(
              padding: EdgeInsets.only(top: 24, bottom: 12),
              child: Text('Select your theme color here:'),
            ),
            DropdownButton(
              icon: const Icon(Icons.arrow_downward),
              value: dropdownValue,
              items: [
                DropdownMenuItem(
                  value: AppThemes.akainu,
                  child: Text(AppThemes.toStr(AppThemes.akainu)),
                ),
                DropdownMenuItem(
                  value: AppThemes.aokiji,
                  child: Text(AppThemes.toStr(AppThemes.aokiji)),
                ),
                DropdownMenuItem(
                  value: AppThemes.kizaru,
                  child: Text(AppThemes.toStr(AppThemes.kizaru)),
                ),
                DropdownMenuItem(
                  value: AppThemes.fujitora,
                  child: Text(AppThemes.toStr(AppThemes.fujitora)),
                ),
                DropdownMenuItem(
                  value: AppThemes.ryokugyu,
                  child: Text(AppThemes.toStr(AppThemes.ryokugyu)),
                ),
              ],
              onChanged: (themeId) async {
                await AdaptiveChameleonTheme.of(context).setTheme(themeId!);
                setState(() {
                  dropdownValue = themeId;
                });
              },
            ),
            const Divider(),
            ThemeColorSelectorWidget(
              themeCollection: AppThemes.themeCollection,
              selectedTheme: AdaptiveChameleonTheme.of(context).themeId,
            ),
            const Divider(),
            const Padding(
              padding: EdgeInsets.only(top: 24, bottom: 12),
              child: Text('Select your theme mode here:'),
            ),
            DropdownButton(
              icon: const Icon(Icons.arrow_downward),
              value: themeModeDropdownValue,
              items: const [
                DropdownMenuItem(
                  value: ThemeMode.light,
                  child: Text('Light'),
                ),
                DropdownMenuItem(
                  value: ThemeMode.dark,
                  child: Text('Dark'),
                ),
                DropdownMenuItem(
                  value: ThemeMode.system,
                  child: Text('System'),
                ),
              ],
              onChanged: (themeMode) async {
                switch (themeMode) {
                  case ThemeMode.light:
                    AdaptiveChameleonTheme.of(context)
                        .changeThemeMode(dark: false);
                  case ThemeMode.dark:
                    AdaptiveChameleonTheme.of(context)
                        .changeThemeMode(dark: true);
                  case ThemeMode.system:
                    AdaptiveChameleonTheme.of(context)
                        .changeThemeMode(dynamic: true);
                  case null:
                    // TODO: Handle this case.
                }

                setState(() {
                  themeModeDropdownValue = themeMode!;
                });
              },
            ),
            const Divider(),
            const ThemeModeSelectorWidget(),
            const Divider(),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Container(
                  margin: const EdgeInsets.all(20),
                  width: 100,
                  height: 120,
                  color: theme.colorScheme.primary,
                  child: Center(
                    child: Padding(
                      padding: const EdgeInsets.all(8),
                      child: Text(
                        'Container in primary color and primary text theme',
                        textAlign: TextAlign.center,
                        style: Theme.of(context).primaryTextTheme.bodyMedium,
                      ),
                    ),
                  ),
                ),
                Container(
                  margin: const EdgeInsets.all(20),
                  width: 100,
                  height: 120,
                  color: theme.colorScheme.secondary,
                  child: Center(
                    child: Padding(
                      padding: const EdgeInsets.all(8),
                      child: Text(
                        'Container in accent color and with accent text theme',
                        textAlign: TextAlign.center,
                        style: Theme.of(context).primaryTextTheme.bodyMedium,
                      ),
                    ),
                  ),
                ),
              ],
            ),
            ElevatedButton(
              onPressed: () {},
              child: Text(
                'Elevated Button',
                textAlign: TextAlign.center,
              ),
            ),
            const Divider(),
          ],
        ),
      ),
    );
  }
}