theme_manager 1.0.0 theme_manager: ^1.0.0 copied to clipboard
A theme manager for light, dark, and system themes.
import 'package:flutter/material.dart';
import 'package:theme_manager/change_theme_widget.dart';
import 'package:theme_manager/theme_manager.dart';
void main() {
WidgetsFlutterBinding.ensureInitialized(); // Required
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return ThemeManager(
/// WidgetsBinding.instance.window.platformBrightness is used because a
/// Material BuildContext will not be available outside of the Material app
defaultBrightness: WidgetsBinding.instance.window.platformBrightness,
data: (Brightness brightness) => ThemeData(
primarySwatch: Colors.blue,
accentColor: Colors.lightBlue,
brightness: brightness,
),
loadBrightnessOnStart: true,
themedWidgetBuilder: (BuildContext context, ThemeData theme) {
return MaterialApp(
title: 'Theme Manager Demo',
theme: theme,
home: MyHomePage(),
);
},
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Theme Manager'),
centerTitle: true,
),
body: Center(
child: IntrinsicWidth(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
RaisedButton(
onPressed: () => ThemeManager.of(context).setBrightnessPreference(BrightnessPreference.system),
child: const Text('System'),
),
Padding(
padding: const EdgeInsets.symmetric(vertical: 6),
child: RaisedButton(
onPressed: () => ThemeManager.of(context).setBrightnessPreference(BrightnessPreference.light),
child: const Text('Light'),
),
),
RaisedButton(
onPressed: () => ThemeManager.of(context).setBrightnessPreference(BrightnessPreference.dark),
child: const Text('Dark'),
),
],
),
),
),
floatingActionButton: FloatingActionButton(
onPressed: showThemePicker,
child: const Icon(Icons.color_lens, color: Colors.white),
),
);
}
void showThemePicker() {
showDialog<void>(
context: context,
builder: (BuildContext context) {
return ThemePickerDialog(
onSelectedTheme: (BrightnessPreference preference) {
ThemeManager.of(context).setBrightnessPreference(preference);
},
);
},
);
}
}