How To Create Signature Pad Form Builder In Flutter

dependencies:
  flutter:
    sdk: flutter
  flutter_form_builder: ^3.7.1

flutter pub get

import 'package:flutter_form_builder/flutter_form_builder.dart';
import 'package:intl/intl.dart';

import 'package:flutter/material.dart';
import 'package:flutter_form_builder/flutter_form_builder.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        textTheme: TextTheme(
          body1: TextStyle(fontSize: 16,color: Colors.black45,fontWeight: FontWeight.bold),
          display1: TextStyle(fontSize: 10),
        ),
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  var data;
  bool autoValidate = true;
  bool readOnly = false;
  bool showSegmentedControl = true;
  final GlobalKey<FormBuilderState> _fbKey = GlobalKey<FormBuilderState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.red[800],
        title: Text("SignaturePad Form BUilder"),
      ),
      body: Padding(
        padding: EdgeInsets.all(10),
        child: SingleChildScrollView(
          child: Column(
            children: <Widget>[
              FormBuilder(
                key: _fbKey,
                initialValue: {
                  'date': DateTime.now(),
                  'accept_terms': false,
                },
//                autovalidateMode: true,
                child: Column(
                  children: <Widget>[
                    SizedBox(height: 10),
                    FormBuilderSignaturePad(
                      decoration: InputDecoration(
                          labelText: "Signature",
                        labelStyle:   Theme.of(context).textTheme.body1,
                      ),
                      attribute: "signature",
                      height: 100,
                    ),
                  ],
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}