typical m3e theme usage

snippet.dart

@override
Widget build(BuildContext context) {
    final light = ColorScheme.fromSeed(
        seedColor: Colors.purple, brightness: Brightness.light);
    final dark = ColorScheme.fromSeed(
        seedColor: Colors.purple, brightness: Brightness.dark);
    return MaterialApp(
      title: 'M3E Gallery',
      theme: light.toM3EThemeData(override: M3eOverride(colors: M3ECustomColors.from(light),
                              brandColors: M3EBrandColors.copyWith(brandOne: brandOne.harmonizeWith(light.primary),
                                  brandTwo: brandTwo.harmonizeWith(light.primary), brandThree: brandThree.harmonizeWWith(light.primary)),
                              typography: M3ECustomTypography(base: CustomTextTheme, emphasized: MyM3ECustomEmphasized ),
                              shapes: M3ECustomShapes.expressive(),
                              spacing: M3ECustomSpacing.regular(),
                              motion: M3EMotion.expressive()),
                         base: ThemeDataWithCustomComponentThemes(colorScheme: light) ),
      darkTheme: dark.toM3EThemeData(override: M3eOverride(colors: M3ECustomColors(dark),
                              brandColors: M3EBrandColors.copyWith(brandOne: brandOne.harmonizeWith(dark.primary),
                                  brandTwo: brandTwo.harmonizeWith(dark.primary), brandThree: brandThree.harmonizeWith(dark.primary)),
                              typography: M3ECustomTypography(base: CustomTextTheme, emphasized: MyM3ECustomEmphasized ),
                              shapes: M3ECustomShapes.expressive(),
                              spacing: M3ECustomSpacing.regular(),
                              motion: M3EMotion.expressive()),
                  base: ThemeDataWithCustomComponentThemes(colorScheme: dark)),
      themeMode: _mode,
      home: GalleryHome(
        isDark: _mode == ThemeMode.dark,
        onToggleBrightness: _toggleMode,
      ),
      debugShowCheckedModeBanner: false,
    );
  }