TableOfContents.dart

class TableOfContents extends StatelessWidget {
  final List<Section> sections;
  final void Function(Section) onItemTap;

  const TableOfContents({
    Key? key,
    this.sections = const <Section>[],
    required this.onItemTap,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: const EdgeInsets.all(20),
      padding: const EdgeInsets.only(left: 16, top: 24, right: 16, bottom: 10),
      decoration: BoxDecoration(
        color: Colors.white12.withOpacity(0.3),
        borderRadius: const BorderRadius.all(Radius.circular(8.0)),
        border: Border.all(
          width: 2,
          color: Colors.grey,
        ),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: sections
            .map((e) => SectionLink(section: e, onTap: onItemTap))
            .toList(),
      ),
    );
  }
}