// 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:flutter/material.dart';

import 'package:webview_flutter/webview_flutter.dart';

enum _MenuOptions { navigationDelegate, userAgent, javascriptChannel }

class Menu extends StatefulWidget {

const Menu({required this.controller, super.key});

final WebViewController controller;

@override

State<Menu> createState() => _MenuState();

}

class _MenuState extends State<Menu> {

@override

Widget build(BuildContext context) {

return PopupMenuButton<_MenuOptions>(

onSelected: (value) async {

switch (value) {

case _MenuOptions.navigationDelegate:

await widget.controller.loadRequest(

Uri.parse('https://youtube.com'),

);

case _MenuOptions.userAgent:

final userAgent = await widget.controller

.runJavaScriptReturningResult('navigator.userAgent');

if (!context.mounted) return;

ScaffoldMessenger.of(

context,

).showSnackBar(SnackBar(content: Text('$userAgent')));

case _MenuOptions.javascriptChannel:

await widget.controller.runJavaScript('''

var req = new XMLHttpRequest();

req.open('GET', "https://api.ipify.org/?format=json");

req.onnload = function() {

if (req.status == 200) {

let response = JSON.parse(req.responseText);

SnackBar.postMessage("IP Address: " + response.ip);

} else {

SnackBar.postMessage("Error: " + req.status);

}

}

req.send();''');

}

},

itemBuilder: (context) => [

const PopupMenuItem<_MenuOptions>(

value: _MenuOptions.navigationDelegate,

child: Text('Navigate to YouTube'),

),

const PopupMenuItem<_MenuOptions>(

value: _MenuOptions.userAgent,

child: Text('Show user-agent'),

),

const PopupMenuItem<_MenuOptions>(

value: _MenuOptions.javascriptChannel,

child: Text('Lookup IP Address'),

),

],

);

}

}