我想放置一个自定义小部件，而不是appbar，并希望在它下面有一个选项卡视图

import 'package:flutter/material.dart';

class CustomWidgetPage extends StatefulWidget {
  @override
  _CustomWidgetPageState createState() => _CustomWidgetPageState();
}

class _CustomWidgetPageState extends State<CustomWidgetPage> with SingleTickerProviderStateMixin {
  TabController _tabController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 2, vsync: this);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Custom Widget Page"),
      ),
      body: Column(
        children: [
          // 自定义小部件
          Container(
            height: 100,
            color: Colors.blue,
            child: Center(
              child: Text(
                "Custom Widget",
                style: TextStyle(fontSize: 24, color: Colors.white),
              ),
            ),
          ),
          // 选项卡视图
          TabBar(
            controller: _tabController,
            tabs: [
              Tab(text: "Tab 1"),
              Tab(text: "Tab 2"),
            ],
          ),
          Expanded(
            child: TabBarView(
              controller: _tabController,
              children: [
                // 第一个选项卡的内容
                Container(
                  color: Colors.red,
                  child: Center(
                    child: Text(
                      "Tab 1 Content",
                      style: TextStyle(fontSize: 24, color: Colors.white),
                    ),
                  ),
                ),
                // 第二个选项卡的内容
                Container(
                  color: Colors.green,
                  child: Center(
                    child: Text(
                      "Tab 2 Content",
                      style: TextStyle(fontSize: 24, color: Colors.white),
                    ),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: CustomWidgetPage(),
  ));
}