如何自定义多页PageView的首页滚动行为？

import 'package:flutter/material.dart';

class CustomPageView extends StatefulWidget {
  @override
  _CustomPageViewState createState() => _CustomPageViewState();
}

class _CustomPageViewState extends State<CustomPageView> {
  PageController _pageController;
  int _currentPage = 0;

  @override
  void initState() {
    super.initState();
    _pageController = PageController(initialPage: _currentPage);
    _pageController.addListener(_handlePageChange);
  }

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

  void _handlePageChange() {
    setState(() {
      _currentPage = _pageController.page.round();
    });

    // 自定义首页滚动行为
    if (_currentPage == 0) {
      // 执行自定义的滚动行为
      // 例如改变背景颜色、显示特定的内容等
    }
  }

  @override
  Widget build(BuildContext context) {
    return PageView(
      controller: _pageController,
      scrollDirection: Axis.horizontal,
      children: [
        // 页面1
        Container(
          color: Colors.red,
          child: Center(
            child: Text('Page 1'),
          ),
        ),
        // 页面2
        Container(
          color: Colors.blue,
          child: Center(
            child: Text('Page 2'),
          ),
        ),
        // 页面3
        Container(
          color: Colors.green,
          child: Center(
            child: Text('Page 3'),
          ),
        ),
      ],
    );
  }
}