如何在flutter Slider小工具上隐藏拇指？

import 'package:flutter/material.dart';

class MySlider extends StatefulWidget {
  @override
  _MySliderState createState() => _MySliderState();
}

class _MySliderState extends State<MySlider> {
  double _value = 0.0;

  @override
  Widget build(BuildContext context) {
    return SliderTheme(
      data: SliderTheme.of(context).copyWith(
        thumbShape: RoundSliderThumbShape(enabledThumbRadius: 0.0), // 设置拇指形状为空
      ),
      child: Slider(
        value: _value,
        onChanged: (newValue) {
          setState(() {
            _value = newValue;
          });
        },
      ),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Hide Slider Thumb')),
        body: Center(
          child: MySlider(),
        ),
      ),
    );
  }
}