如何使"Stack“中的小部件计数依赖于变量？

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Dynamic Stack Example')),
        body: DynamicStackWidget(),
      ),
    );
  }
}

class DynamicStackWidget extends StatefulWidget {
  @override
  _DynamicStackWidgetState createState() => _DynamicStackWidgetState();
}

class _DynamicStackWidgetState extends State<DynamicStackWidget> {
  int widgetCount = 5; // 这个变量决定了Stack中小部件的数量

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Stack(
        children: List.generate(widgetCount, (index) {
          return Positioned(
            left: 50 * index,
            top: 50 * index,
            child: Container(
              width: 100,
              height: 100,
              color: Colors.blue.withOpacity(0.5),
              child: Center(child: Text('Widget $index')),
            ),
          );
        }),
      ),
    );
  }
}

void changeWidgetCount(int newCount) {
  setState(() {
    widgetCount = newCount;
  });
}