Creare un color picker in Flutter con flutter_material_color_picker

flutter_material_color_picker è un package per Flutter che ci consente di creare un color picker.

Facile da usare, in quanto basta inserirlo in dialog; inoltre la palette colori a disposizione possiamo sia crearla a mano che usando fullMaterialColors.

Per installarlo:

flutter pub add flutter_material_color_picker

Qui un esempio di codice:

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

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Test',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(
          seedColor: Colors.deepPurple,
        ),
        useMaterial3: true,
      ),
      // home: const MyHomePage(),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

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

class _MyHomePageState extends State<MyHomePage> {
  ColorSwatch _colorSwatch = Colors.amber;

  void _pickColor() async {
    showDialog(
        context: context,
        builder: (_) {
          return AlertDialog(
            contentPadding: const EdgeInsets.all(5.0),
            actions: [
              TextButton(
                onPressed: Navigator.of(context).pop,
                child: const Text('Chiudi'),
              ),
              TextButton(
                onPressed: () {
                  Navigator.of(context).pop;
                  print(_colorSwatch.value);
                },
                child: const Text('Invia'),
              ),
            ],
            content: MaterialColorPicker(
              selectedColor: _colorSwatch,
              allowShades: false,
              colors: fullMaterialColors,
              onMainColorChange: (color) {
                setState(() {
                  _colorSwatch = color!;
                });
              },
            ),
          );
        });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: const Text('Flutter Test'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            _pickColor();
          },
          child: const Text('Pick color'),
        ),
      ),
    );
  }
}

Enjoy!