如何在TextField中仅显示双精度值

import 'package:flutter/material.dart';

class DoubleTextField extends StatefulWidget {
  @override
  _DoubleTextFieldState createState() => _DoubleTextFieldState();
}

class _DoubleTextFieldState extends State<DoubleTextField> {
  TextEditingController _controller;

  @override
  void initState() {
    super.initState();
    _controller = TextEditingController();
  }

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

  double _parseDouble(String value) {
    double parsedValue;
    try {
      parsedValue = double.parse(value);
    } catch (error) {
      parsedValue = 0.0; // 默认值或错误处理
    }
    return parsedValue;
  }

  @override
  Widget build(BuildContext context) {
    return TextField(
      controller: _controller,
      keyboardType: TextInputType.numberWithOptions(decimal: true),
      decoration: InputDecoration(
        labelText: '双精度值',
      ),
      onChanged: (value) {
        double parsedValue = _parseDouble(value);
        _controller.value = _controller.value.copyWith(
          text: parsedValue.toString(),
          selection: TextSelection.collapsed(offset: parsedValue.toString().length),
        );
      },
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: Text('TextField示例'),
      ),
      body: Center(
        child: DoubleTextField(),
      ),
    ),
  ));
}