import 'package:flutter/material.dart';

class CustomAppBar extends StatelessWidget implements PreferredSizeWidget {
  final String title;
  final Widget? subtitle;

  const CustomAppBar({
    Key? key,
    required this.title,
    this.subtitle,
  }) : super(key: key);

  @override
  Size get preferredSize => Size.fromHeight(subtitle == null ? 56.0 : 72.0);

  @override
  Widget build(BuildContext context) {
    return AppBar(
      title: subtitle == null
          ? Text(title)
          : Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(title, style: TextStyle(fontSize: 20)),
                subtitle!,
              ],
            ),
      // autres propriétés si besoin
    );
  }
}