Ever wished that SizedBox implements PreferredSizeWidget? Use this to bridge the gap between SizedBox and PreferredSizedWidget!

PreferredSizedBox.dart

/// This class extends [SizedBox] whilst implementing [PreferredSizeWidget]
/// based on the defined size. This allows the use of [SizedBox] in places
/// where [PreferredSizeWidget] is required, such as in [AppBar.preferredSize].
class PreferredSizedBox extends SizedBox implements PreferredSizeWidget {
  const PreferredSizedBox({super.key});

  const PreferredSizedBox.shrink({super.key, super.child}) : super.shrink();
  const PreferredSizedBox.expand({super.key, super.child}) : super.expand();
  PreferredSizedBox.fromSize({super.key, super.child, super.size})
      : super.fromSize();
  const PreferredSizedBox.square({super.key, super.child, super.dimension})
      : super.square();

  @override
  Size get preferredSize => Size(
        width ?? double.infinity,
        height ?? double.infinity,
      );
}