form_builder_thai_provinces 0.1.0

A flutter_form_builder field for picking a Thai province/district/subdistrict address (cascading dropdowns or type-ahead), with two-way value sync.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter_form_builder/flutter_form_builder.dart';
import 'package:form_builder_thai_provinces/form_builder_thai_provinces.dart';

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

/// The example application root.
class ExampleApp extends StatelessWidget {
  /// Creates the example app.
  const ExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'form_builder_thai_provinces example',
      theme: ThemeData(useMaterial3: true),
      home: const ExamplePage(),
    );
  }
}

/// A page with a [FormBuilder] holding a [FormBuilderThaiAddress] and a submit
/// button that validates and shows the saved value.
class ExamplePage extends StatefulWidget {
  /// Creates the example page.
  const ExamplePage({super.key});

  @override
  State<ExamplePage> createState() => _ExamplePageState();
}

class _ExamplePageState extends State<ExamplePage> {
  final _formKey = GlobalKey<FormBuilderState>();
  FormBuilderThaiAddressMode _mode = FormBuilderThaiAddressMode.cascading;
  String _result = '';

  void _submit() {
    final saved = _formKey.currentState!.saveAndValidate();
    if (!saved) {
      setState(() => _result = 'Invalid — please complete the address.');
      return;
    }
    final value =
        _formKey.currentState!.value['address'] as ThaiAddressSelection?;
    setState(() => _result = 'Saved: ${value?.format() ?? '(none)'}');
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Thai address — FormBuilder')),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16),
        child: FormBuilder(
          key: _formKey,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              SegmentedButton<FormBuilderThaiAddressMode>(
                segments: const [
                  ButtonSegment(
                    value: FormBuilderThaiAddressMode.cascading,
                    label: Text('Cascading'),
                  ),
                  ButtonSegment(
                    value: FormBuilderThaiAddressMode.autocomplete,
                    label: Text('Autocomplete'),
                  ),
                ],
                selected: {_mode},
                onSelectionChanged: (s) => setState(() => _mode = s.first),
              ),
              const SizedBox(height: 16),
              FormBuilderThaiAddress(
                // Re-key so the field rebuilds cleanly when the mode flips.
                key: ValueKey(_mode),
                name: 'address',
                mode: _mode,
                validator: ThaiAddressValidators.required(),
              ),
              const SizedBox(height: 16),
              FilledButton(onPressed: _submit, child: const Text('Submit')),
              const SizedBox(height: 12),
              Text(_result),
            ],
          ),
        ),
      ),
    );
  }
}