如何在两个不同的方向滚动颤动PageView？

import 'package:flutter/material.dart';

class ScrollPage extends StatefulWidget {
  @override
  _ScrollPageState createState() => _ScrollPageState();
}

class _ScrollPageState extends State<ScrollPage> {
  PageController _pageController;
  double _currentPage = 0;

  @override
  void initState() {
    super.initState();
    _pageController = PageController(initialPage: 0, viewportFraction: 0.8);
    _pageController.addListener(() {
      setState(() {
        _currentPage = _pageController.page;
      });
    });
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Scroll Page'),
      ),
      body: PageView.builder(
        controller: _pageController,
        itemCount: 5,
        itemBuilder: (context, index) {
          double scale = 1.0;
          double angle = 0.0;

          if (index - _currentPage >= 0 && index - _currentPage <= 1) {
            // 当前页面及相邻页面
            scale = 1 - (_currentPage - index) * 0.3;
            angle = (_currentPage - index) * 30;
          } else if (index - _currentPage < 0 && index - _currentPage >= -1) {
            // 当前页面的前一页
            scale = 1 - (index - _currentPage) * 0.3;
            angle = (index - _currentPage) * 30;
          }

          return Transform(
            transform: Matrix4.identity()
              ..setEntry(3, 2, 0.001)
              ..rotateY(angle * 0.0174533),
            alignment: Alignment.center,
            child: Container(
              margin: EdgeInsets.all(10),
              decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(10),
                color: Colors.blue,
              ),
              child: Center(
                child: Text(
                  'Page $index',
                  style: TextStyle(fontSize: 20, color: Colors.white),
                ),
              ),
            ),
          );
        },
      ),
    );
  }
}