selfprivacy.org.app/lib/ui/atoms/buttons/brand_button.dart

import 'package:flutter/material.dart';

class BrandButton {
  static ConstrainedBox filled({
    required final VoidCallback? onPressed,
    final Key? key,
    final String? title,
    final Widget? child,
  }) {
    assert((title ?? child) != null, 'either title or child must not be empty');
    assert(title != null || child != null, 'title or child must be provided');

    return ConstrainedBox(
      constraints: const BoxConstraints(
        minWidth: double.infinity,
      ),
      child: FilledButton(
        key: key,
        onPressed: onPressed,
        style: ElevatedButton.styleFrom(
          tapTargetSize: MaterialTapTargetSize.padded,
          padding: const EdgeInsets.symmetric(horizontal: 16.0),
        ),
        child: child ??
            Text(
              title ?? '',
              textAlign: TextAlign.center,
              overflow: TextOverflow.ellipsis,
            ),
      ),
    );
  }

  static ConstrainedBox text({
    required final VoidCallback onPressed,
    required final String title,
    final Key? key,
  }) =>
      ConstrainedBox(
        constraints: const BoxConstraints(
          minHeight: 40,
          minWidth: double.infinity,
        ),
        child: TextButton(onPressed: onPressed, child: Text(title)),
      );
}