generic-centering-of-widgets-in-flutter.dart

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import 'package:flutter/material.dart';

T centered<T>() {
  switch (T) {
    case CrossAxisAlignment:
      return CrossAxisAlignment.center as T;
    case MainAxisAlignment:
      return MainAxisAlignment.center as T;
    case Alignment:
      return Alignment.center as T;
    default:
      throw UnsupportedError('$T is not supported');
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Row(
      crossAxisAlignment: centered(),
      mainAxisAlignment: centered(),
      children: [
        TextButton(
          onPressed: () {},
          child: const Text('Press me'),
        ),
      ],
    );
  }
}