如何使InViewNotifierList返回的容器高度灵活

import 'package:flutter/material.dart';

class FlexibleContainer extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flexible Container'),
      ),
      body: Container(
        child: Column(
          children: [
            Flexible(
              child: InViewNotifierList(
                scrollDirection: Axis.vertical,
                shrinkWrap: true,
                initialInViewIds: ['item1', 'item2', 'item3'],
                isInViewPortCondition:
                    (double deltaTop, double deltaBottom, double viewPortDimension) {
                  return deltaTop < (0.5 * viewPortDimension) &&
                      deltaBottom > (0.5 * viewPortDimension);
                },
                itemBuilder: (BuildContext context, int index, double isInViewPort, double contextWidth) {
                  return Container(
                    height: 100, // 设置子元素的高度
                    child: ListTile(
                      title: Text('Item $index'),
                    ),
                  );
                },
              ),
            ),
            Expanded(
              child: Container(
                color: Colors.grey[200],
                child: Center(
                  child: Text(
                    'Footer',
                    style: TextStyle(fontSize: 20),
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}