flutter插件:flex_color_scheme 美观主题配色

void main() => runApp(const DemoApp());

class DemoApp extends StatefulWidget {
  const DemoApp({Key key}) : super(key: key);
  @override
  _DemoAppState createState() => _DemoAppState();
}

class _DemoAppState extends State<DemoApp> {
  // Used to select if we use the dark or light theme.
  ThemeMode themeMode = ThemeMode.light;

  @override
  Widget build(BuildContext context) {
    // Define which predefined FlexScheme to use.
    // Go ahead and try some other ones too.
    const FlexScheme usedFlexScheme = FlexScheme.mandyRed;
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'FlexColorScheme',
      // A light scheme, passed to FlexColorScheme.light factory, then use
      // toTheme to return the resulting theme to the MaterialApp theme.
      theme: FlexColorScheme.light(
        scheme: usedFlexScheme,
        // Use comfortable on desktops instead of compact, devices use default.
        visualDensity: FlexColorScheme.comfortablePlatformDensity,
      ).toTheme,
      // Same thing for the dark theme, but using FlexColorScheme.dark factory.
      darkTheme: FlexColorScheme.dark(
        scheme: usedFlexScheme,
        visualDensity: FlexColorScheme.comfortablePlatformDensity,
      ).toTheme,
      // Use the above dark or light theme, based on active themeMode
      // value light/dark/system.
      themeMode: themeMode,
      // The HomePage, with its properties. In this example we pass it the
      // current themeMode, change it via its call-back. We also pass the
      // currently used FlexSchemeData to the HomePage so we can use it to 
      // display some info about it, and use the colors on the theme switch.
      home: HomePage(
        themeMode: themeMode,
        onThemeModeChanged: (ThemeMode mode) {
          setState(() { themeMode = mode; });
        },
        // Pass in the used active FlexSchemeData so we can
        // use its properties on the HomePage.
        flexSchemeData: FlexColor.schemes[usedFlexScheme],
      ),
    );
  }
}