import 'package:flutter/material.dart';

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

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

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    var items = [
      'Ayo',
      'This',
      'Don',
      'Look',
      'Right',
    ].map((String val) {
      return DropdownMenuItem(
        value: val,
        child: Text(
          val,
        ),
      );
    }).toList();

    return MaterialApp(
      title: _title,
      theme: ThemeData(
        inputDecorationTheme: const InputDecorationTheme(
          enabledBorder: OutlineInputBorder(
            borderRadius: BorderRadius.all(Radius.circular(16 * 2)),
            borderSide: BorderSide(color: Colors.grey, width: 1),
          ),
          focusedBorder: OutlineInputBorder(
            borderRadius: BorderRadius.all(Radius.circular(16)),
            borderSide: BorderSide(color: Colors.blue, width: 2),
          ),
          border: OutlineInputBorder(
            borderRadius: BorderRadius.all(Radius.circular(16 * 2)),
            borderSide: BorderSide(color: Colors.blue, width: 2),
          ),
        ),
      ),
      home: Scaffold(
        body: Center(
          child: SizedBox(
            width: 500,
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                DropdownButtonFormField(
                  borderRadius: const BorderRadius.all(
                    /// dramatic radius for easier visualization
                    Radius.circular(50),
                  ),
                  onChanged: (String? value) {},
                  items: items,
                ),
                const SizedBox(height: 50),
                DropdownButton(
                  borderRadius: const BorderRadius.all(
                    /// dramatic radius for easier visualization
                    Radius.circular(50),
                  ),
                  items: items,
                  onChanged: (String? value) {},
                )
              ],
            ),
          ),
        ),
      ),
    );
  }
}