main.dart

import 'package:flutter/material.dart';

const Color darkBlue = Color.fromARGB(255, 18, 32, 47);

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(
        scaffoldBackgroundColor: darkBlue,
      ),
      debugShowCheckedModeBanner: false,
      home: const Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
        onPressed: () {
          showDialog(
              context: context,
              builder: (context) {
                bool isChecked = false;
                return StatefulBuilder(builder: (context, setState) {
                  return AlertDialog(
                    content: Row(mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [
                      const Text("Confirm"),
                      Checkbox(
                          value: isChecked,
                          onChanged: (checked) {
                            setState(() => isChecked = checked ?? false);
                          })
                    ]),
                    title: const Text('Stateful Dialog'),
                    actions: <Widget>[
                      InkWell(
                        child: const Text('Cancel'),
                        onTap: () => Navigator.of(context).pop(),
                      ),
                      InkWell(
                        child: const Text('OK'),
                        onTap: isChecked ? () => Navigator.of(context).pop() : null,
                      ),
                    ],
                  );
                });
              });
        },
        child: const Text('Show alert'));
  }
}