ReactiveDropdownMenuField

[BenjiFarquhar]

Adds reactive version of DropdownMenu.

DropdownMenu is an updated version of DropdownButton that follows the Material 3 specification.

[vasilich6107]

Hey @BenjiFarquhar
There is already a separate package for that
https://pub.dev/packages/reactive_dropdown_menu

[BenjiFarquhar]

Hi @vasilich6107

Oh, I see. I think Flutter might have a bug in their one. It correctly gives an error when entering random text the first time, then after a selection, you can type anything without error

The example at https://pub.dev/packages/reactive_dropdown_menu:

I added a validator to demonstrate the behaviour:

import 'package:flutter/material.dart';
import 'package:reactive_dropdown_menu/reactive_dropdown_menu.dart';
import 'package:reactive_forms/reactive_forms.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  FormGroup buildForm() => fb.group({
        'input': FormControl<ColorLabel>(value: null, validators: [Validators.required]),
      });

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: Scaffold(
        appBar: AppBar(),
        body: SafeArea(
          child: SingleChildScrollView(
            physics: const BouncingScrollPhysics(),
            padding: const EdgeInsets.symmetric(
              horizontal: 20.0,
              vertical: 20.0,
            ),
            child: ReactiveFormBuilder(
              form: buildForm,
              builder: (context, form, child) {
                return Column(
                  children: [
                    ReactiveDropdownMenu<ColorLabel, ColorLabel>(
                      formControlName: 'input',
                      
                      showErrors: (control) => control.invalid,
                      validationMessages: {
                        'required': (error) =>
                            'Please select the difficulty of preparing this dish from the dropdown menu',
                      },
                      dropdownMenuEntries: ColorLabel.values
                          .map<DropdownMenuEntry<ColorLabel>>(
                              (ColorLabel color) {
                        return DropdownMenuEntry<ColorLabel>(
                          value: color,
                          label: color.label,
                          enabled: color.label != 'Grey',
                          style: MenuItemButton.styleFrom(
                            foregroundColor: color.color,
                          ),
                        );
                      }).toList(),
                    ),
                    ElevatedButton(
                      child: const Text('Submit'),
                      onPressed: () {
                        if (form.valid) {
                          debugPrint(form.value.toString());
                        }
                      },
                    ),
                  ],
                );
              },
            ),
          ),
        ),
      ),
    );
  }
}

enum ColorLabel {
  blue('Blue', Colors.blue),
  pink('Pink', Colors.pink),
  green('Green', Colors.green),
  yellow('Orange', Colors.orange),
  grey('Grey', Colors.grey);

  const ColorLabel(this.label, this.color);
  final String label;
  final Color color;
}

// DropdownMenuEntry labels and values for the second dropdown menu.
enum IconLabel {
  smile('Smile', Icons.sentiment_satisfied_outlined),
  cloud(
    'Cloud',
    Icons.cloud_outlined,
  ),
  brush('Brush', Icons.brush_outlined),
  heart('Heart', Icons.favorite);

  const IconLabel(this.label, this.icon);
  final String label;
  final IconData icon;
}

Screen.Recording.2024-12-08.at.11.42.17.am.mov

With _ensureValueIsInEntries:

Screen.Recording.2024-12-08.at.11.56.30.am.mov