Flutter:启用/禁用文本表单，如果禁用则提交默认信息(无用户输入)

import 'package:flutter/material.dart';

class MyForm extends StatefulWidget {
  @override
  _MyFormState createState() => _MyFormState();
}

class _MyFormState extends State<MyForm> {
  TextEditingController _textEditingController = TextEditingController();
  bool _isFormEnabled = true;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Form Example'),
      ),
      body: Column(
        children: [
          TextField(
            controller: _textEditingController,
            enabled: _isFormEnabled,
          ),
          RaisedButton(
            child: Text('Submit'),
            onPressed: () {
              String userInput = _textEditingController.text;
              if (_isFormEnabled) {
                // 处理用户输入
                print('用户输入：$userInput');
              } else {
                // 提交默认信息
                print('默认信息：无用户输入');
              }
            },
          ),
          RaisedButton(
            child: Text(_isFormEnabled ? '禁用表单' : '启用表单'),
            onPressed: () {
              setState(() {
                _isFormEnabled = !_isFormEnabled;
              });
            },
          ),
        ],
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MyForm(),
  ));
}