ChipTabSwitcher class

A horizontally scrollable chip-style tab switcher.

Works with either:

1. An explicit controller, or
2. A surrounding DefaultTabController.

Example with DefaultTabController:

const terms = ['114-2', '114-1', '113-2'];

DefaultTabController(
  length: terms.length,
  child: Scaffold(
    appBar: AppBar(
      title: const ChipTabSwitcher(tabs: terms),
    ),
    body: TabBarView(
      children: [
        for (final term in terms) Center(child: Text(term)),
      ],
    ),
  ),
)

Example with an external TabController:

class TermSwitcherExample extends StatefulWidget {
  const TermSwitcherExample({super.key});

  @override
  State<TermSwitcherExample> createState() => _TermSwitcherExampleState();
}

class _TermSwitcherExampleState extends State<TermSwitcherExample>
    with SingleTickerProviderStateMixin {
  static const terms = ['A', 'B', 'C'];
  late final TabController _controller;

  @override
  void initState() {
    super.initState();
    _controller = TabController(length: terms.length, vsync: this);
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        ChipTabSwitcher(
          tabs: terms,
          controller: _controller,
        ),
        Expanded(
          child: TabBarView(
            controller: _controller,
            children: [
              for (final term in terms) Center(child: Text(term)),
            ],
          ),
        ),
      ],
    );
  }
}