Center aligned SingleChildScrollView.

The child is centered in the SingleChildScrollView. If the child is smaller than SingleChildScrollView, it will be in the center. If it's large, it behaves like a normal SingleChildScrollView. The child's place in the center can be changed. You can choose distribution of children on scrollDirection by specifying mainAxisAlignment like Column.

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

  @override
  Widget build(BuildContext context) {
    return CenteredSingleChildScrollView(
      child: CircularProgressIndicator(),
    );
  }
}

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