Clip your TabBarView

clip_your_tabbarview.dart

import 'package:flutter/material.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(const App());
}

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Home(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      initialIndex: 0,
      length: 3,
      child: Scaffold(
        body: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            const SizedBox(
              height: 200,
              child: ColoredBox(
                color: Colors.orange,
                child: Material(
                  color: Colors.red,
                  borderRadius: BorderRadius.only(
                    bottomLeft: Radius.circular(24.0),
                  ),
                ),
              ),
            ),
            const SizedBox(
              height: 50,
              child: ColoredBox(
                color: Colors.red,
                child: Material(
                  color: Colors.orange,
                  borderRadius: BorderRadius.only(
                    topRight: Radius.circular(24.0),
                  ),
                  child: TabBar(
                    tabs: [
                      Tab(
                        child: Text('Tab 0'),
                      ),
                      Tab(
                        child: Text('Tab 1'),
                      ),
                      Tab(
                        child: Text('Tab 2'),
                      ),
                    ],
                  ),
                ),
              ),
            ),
            Expanded(
              child: ColoredBox(
                color: Colors.orange,
                child: ClipRRect(
                  borderRadius: const BorderRadius.only(
                    topRight: Radius.circular(24.0),
                  ),
                  child: Material(
                    color: Colors.white,
                    child: TabBarView(
                      children: [
                        ListView.separated(
                          separatorBuilder: (context, index) => const SizedBox(
                            height: 10.0,
                          ),
                          padding: EdgeInsets.zero,
                          itemCount: 100,
                          itemBuilder: (context, index) => Material(
                            color: Colors.grey,
                            child: ListTile(
                              title: Text('Tab0-$index'),
                              onTap: () {},
                            ),
                          ),
                        ),
                        ListView.separated(
                          separatorBuilder: (context, index) => const SizedBox(
                            height: 10.0,
                          ),
                          padding: EdgeInsets.zero,
                          itemCount: 100,
                          itemBuilder: (context, index) => Material(
                            color: Colors.amber,
                            child: ListTile(
                              title: Text('Tab0-$index'),
                              onTap: () {},
                            ),
                          ),
                        ),
                        ListView.separated(
                          separatorBuilder: (context, index) => const SizedBox(
                            height: 10.0,
                          ),
                          padding: EdgeInsets.zero,
                          itemCount: 100,
                          itemBuilder: (context, index) => Material(
                            color: Colors.cyan,
                            child: ListTile(
                              title: Text('Tab0-$index'),
                              onTap: () {},
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}