ffigen_codelab/step_05/example/lib/main.dart

// Copyright 2022 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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

const String jsCode = '1+2';

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

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  late Duktape duktape;
  String output = '';

  @override
  void initState() {
    super.initState();
    duktape = Duktape();
    setState(() {
      output = 'Initialized Duktape';
    });
  }

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

  @override
  Widget build(BuildContext context) {
    const textStyle = TextStyle(fontSize: 25);
    const spacerSmall = SizedBox(height: 10);
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Duktape Test')),
        body: Center(
          child: Container(
            padding: const EdgeInsets.all(10),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                Text(output, style: textStyle, textAlign: TextAlign.center),
                spacerSmall,
                ElevatedButton(
                  child: const Text('Run JavaScript'),
                  onPressed: () {
                    duktape.evalString(jsCode);
                    setState(() {
                      output = '$jsCode => ${duktape.getInt(-1)}';
                    });
                  },
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}