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samples/material_3_demo/lib/main.dart

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// Copyright 2021 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
import 'constants.dart';
import 'home.dart';
void main() {
runApp(
const App(),
);
}
class App extends StatefulWidget {
const App({super.key});
@override
State<App> createState() => _AppState();
}
class _AppState extends State<App> {
bool useMaterial3 = true;
ThemeMode themeMode = ThemeMode.system;
ColorSeed colorSelected = ColorSeed.baseColor;
bool get useLightMode {
switch (themeMode) {
case ThemeMode.system:
return SchedulerBinding.instance.window.platformBrightness ==
Brightness.light;
case ThemeMode.light:
return true;
case ThemeMode.dark:
return false;
}
}
void handleBrightnessChange(bool useLightMode) {
setState(() {
themeMode = useLightMode ? ThemeMode.light : ThemeMode.dark;
});
}
void handleMaterialVersionChange() {
setState(() {
useMaterial3 = !useMaterial3;
});
}
void handleColorSelect(int value) {
setState(() {
colorSelected = ColorSeed.values[value];
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Material 3',
themeMode: themeMode,
theme: ThemeData(
colorSchemeSeed: colorSelected.color,
useMaterial3: useMaterial3,
brightness: Brightness.light,
),
darkTheme: ThemeData(
colorSchemeSeed: colorSelected.color,
useMaterial3: useMaterial3,
brightness: Brightness.dark,
),
home: Home(
useLightMode: useLightMode,
useMaterial3: useMaterial3,
colorSelected: colorSelected,
handleBrightnessChange: handleBrightnessChange,
handleMaterialVersionChange: handleMaterialVersionChange,
handleColorSelect: handleColorSelect,
),
);
}
}