Dismissible date picker in Flutter

flutter_dismissible_datepicker.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  void onPressed() {
    showDatePicker(
      keyboardType: TextInputType.datetime,
      context: context,
      initialDate: DateTime.now(),
      firstDate: DateTime(1970, 1, 1),
      lastDate: DateTime(2100, 12, 31),
      builder: (context, child) {
        return WillPopScope(child: child ?? const SizedBox.shrink(), onWillPop: () => Future.value(false),);
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: onPressed,
          child: const Text('Show date picker'),
        ),
      ),
    );
  }
}