ArticlePage.dart

class ArticlePage extends StatelessWidget {
  final List<Section> sections;
  const ArticlePage({Key? key, required this.sections}) : super(key: key);

  @override
  Widget build(BuildContext context) {

    final tableOfContents = TableOfContents(
      sections: sections,
      onItemTap: (section) {
        final targetContext = section.key.currentContext;
        if (targetContext != null) {
          Scrollable.ensureVisible(
            targetContext,
            duration: const Duration(milliseconds: 400),
            curve: Curves.easeInOut,
          );
        }
      },
    );

    final listView = ListView.builder(
      shrinkWrap: true,
      physics: const NeverScrollableScrollPhysics(),
      itemCount: sections.length,
      itemBuilder: (BuildContext context, int index) {
        final section = sections[index];

        return SectionWidget(
          key: section.key,
          section: section,
        );
      },
    );

    return Scaffold(
      appBar: AppBar(
        title: const Text('Home Screen'),
      ),
      body: SafeArea(
        child: SingleChildScrollView(
          child: Padding(
            padding: const EdgeInsets.all(8.0),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                tableOfContents,
                listView,
              ],
            ),
          ),
        ),
      ),
    );
  }
}