Creare temi in Flutter con FlexColorScheme

FlexColorScheme  è un package per Flutter che ci permette di avere un'altra palette di colori da cui attingere per creare dei temi veramente interessanti.

Inoltre mette a disposizione anche un playground online da cui possiamo scegliere tra diverse palette e modificarle; poi ci basta copirare il codice.

Cominciamo con l'installazione:

flutter pub add flex_color_scheme

Qui un eprimo esempio:

import 'package:flutter/material.dart';
import 'package:flex_color_scheme/flex_color_scheme.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: FlexThemeData.light(scheme: FlexScheme.mallardGreen),
      darkTheme: FlexThemeData.dark(scheme: FlexScheme.mallardGreen),
      themeMode: ThemeMode.light,
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.primary,
        title: Text(widget.title),
      ),
      body: const Center(
        child: Text('CIAO'),
      ),
    );
  }
}

Usate il parametro themeMode per vedere le differenze tra dark e light.

Poi io mi sono anche copiato un tema dal playground:

import 'package:flutter/material.dart';
import 'package:flex_color_scheme/flex_color_scheme.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: FlexThemeData.light(
        scheme: FlexScheme.blumineBlue,
        surfaceMode: FlexSurfaceMode.levelSurfacesLowScaffold,
        blendLevel: 7,
        subThemesData: const FlexSubThemesData(
          blendOnLevel: 10,
          blendOnColors: false,
          useTextTheme: true,
          useM2StyleDividerInM3: true,
          alignedDropdown: true,
          useInputDecoratorThemeInDialogs: true,
        ),
        visualDensity: FlexColorScheme.comfortablePlatformDensity,
        useMaterial3: true,
        swapLegacyOnMaterial3: true,
      ),
      darkTheme: FlexThemeData.dark(
        scheme: FlexScheme.blumineBlue,
        surfaceMode: FlexSurfaceMode.levelSurfacesLowScaffold,
        blendLevel: 13,
        subThemesData: const FlexSubThemesData(
          blendOnLevel: 20,
          useTextTheme: true,
          useM2StyleDividerInM3: true,
          alignedDropdown: true,
          useInputDecoratorThemeInDialogs: true,
        ),
        visualDensity: FlexColorScheme.comfortablePlatformDensity,
        useMaterial3: true,
        swapLegacyOnMaterial3: true,
      ),
      themeMode: ThemeMode.dark,
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.primary,
        title: Text(widget.title),
      ),
      body: const Center(
        child: Text('CIAO'),
      ),
    );
  }
}

Enjoy!