packages/webview_flutter/webview_flutter_android/example/lib/main.dart - mirrors/packages - Git at Google

 // Copyright 2013 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.

 // ignore_for_file: public_member_api_docs

 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:typed_data';

 import 'package:flutter/material.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:webview_flutter_android/webview_flutter_android.dart';
 import 'package:webview_flutter_platform_interface/webview_flutter_platform_interface.dart';

 void main() {
   runApp(const MaterialApp(home: WebViewExample()));
 }

 const String kNavigationExamplePage = '''
 <!DOCTYPE html><html>
 <head><title>Navigation Delegate Example</title></head>
 <body>
 <p>
 The navigation delegate is set to block navigation to the youtube website.
 </p>
 <ul>
 <ul><a href="https://www.youtube.com/">https://www.youtube.com/</a></ul>
 <ul><a href="https://www.google.com/">https://www.google.com/</a></ul>
 </ul>
 </body>
 </html>
 ''';

 const String kLocalExamplePage = '''
 <!DOCTYPE html>
 <html lang="en">
 <head>
 <title>Load file or HTML string example</title>
 </head>
 <body>

 <h1>Local demo page</h1>
 <p>
   This is an example page used to demonstrate how to load a local file or HTML
   string using the <a href="https://pub.dev/packages/webview_flutter">Flutter
   webview</a> plugin.
 </p>

 </body>
 </html>
 ''';

 const String kTransparentBackgroundPage = '''
 <!DOCTYPE html>
 <html>
 <head>
   <title>Transparent background test</title>
 </head>
 <style type="text/css">
   body { background: transparent; margin: 0; padding: 0; }
   #container { position: relative; margin: 0; padding: 0; width: 100vw; height: 100vh; }
   #shape { background: #FF0000; width: 200px; height: 100%; margin: 0; padding: 0; position: absolute; top: 0; bottom: 0; left: calc(50% - 100px); }
   p { text-align: center; }
 </style>
 <body>
   <div id="container">
     <p>Transparent background test</p>
     <div id="shape"></div>
   </div>
 </body>
 </html>
 ''';

 class WebViewExample extends StatefulWidget {
   const WebViewExample({super.key, this.cookieManager});

   final PlatformWebViewCookieManager? cookieManager;

   @override
   State<WebViewExample> createState() => _WebViewExampleState();
 }

 class _WebViewExampleState extends State<WebViewExample> {
   late final PlatformWebViewController _controller;

   @override
   void initState() {
     super.initState();

     _controller = PlatformWebViewController(
       AndroidWebViewControllerCreationParams(),
     )
       ..setJavaScriptMode(JavaScriptMode.unrestricted)
       ..setBackgroundColor(const Color(0x80000000))
       ..setPlatformNavigationDelegate(
         PlatformNavigationDelegate(
           const PlatformNavigationDelegateCreationParams(),
         )
           ..setOnProgress((int progress) {
             debugPrint('WebView is loading (progress : $progress%)');
           })
           ..setOnPageStarted((String url) {
             debugPrint('Page started loading: $url');
           })
           ..setOnPageFinished((String url) {
             debugPrint('Page finished loading: $url');
           })
           ..setOnWebResourceError((WebResourceError error) {
             debugPrint('''
 Page resource error:
   code: ${error.errorCode}
   description: ${error.description}
   errorType: ${error.errorType}
   isForMainFrame: ${error.isForMainFrame}
           ''');
           })
           ..setOnNavigationRequest((NavigationRequest request) {
             if (request.url.startsWith('https://www.youtube.com/')) {
               debugPrint('blocking navigation to ${request.url}');
               return NavigationDecision.prevent;
             }
             debugPrint('allowing navigation to ${request.url}');
             return NavigationDecision.navigate;
           })
           ..setOnUrlChange((UrlChange change) {
             debugPrint('url change to ${change.url}');
           }),
       )
       ..addJavaScriptChannel(JavaScriptChannelParams(
         name: 'Toaster',
         onMessageReceived: (JavaScriptMessage message) {
           ScaffoldMessenger.of(context).showSnackBar(
             SnackBar(content: Text(message.message)),
           );
         },
       ))
       ..setOnPlatformPermissionRequest(
         (PlatformWebViewPermissionRequest request) {
           debugPrint(
             'requesting permissions for ${request.types.map((WebViewPermissionResourceType type) => type.name)}',
           );
           request.grant();
         },
       )
       ..loadRequest(LoadRequestParams(
         uri: Uri.parse('https://flutter.dev'),
       ));
   }

   @override
   Widget build(BuildContext context) {
     return Scaffold(
       backgroundColor: const Color(0xFF4CAF50),
       appBar: AppBar(
         title: const Text('Flutter WebView example'),
         // This drop down menu demonstrates that Flutter widgets can be shown over the web view.
         actions: <Widget>[
           NavigationControls(webViewController: _controller),
           SampleMenu(
             webViewController: _controller,
             cookieManager: widget.cookieManager,
           ),
         ],
       ),
       body: PlatformWebViewWidget(
         PlatformWebViewWidgetCreationParams(controller: _controller),
       ).build(context),
       floatingActionButton: favoriteButton(),
     );
   }

   Widget favoriteButton() {
     return FloatingActionButton(
       onPressed: () async {
         final String? url = await _controller.currentUrl();
         if (context.mounted) {
           ScaffoldMessenger.of(context).showSnackBar(
             SnackBar(content: Text('Favorited $url')),
           );
         }
       },
       child: const Icon(Icons.favorite),
     );
   }
 }

 enum MenuOptions {
   showUserAgent,
   listCookies,
   clearCookies,
   addToCache,
   listCache,
   clearCache,
   navigationDelegate,
   doPostRequest,
   loadLocalFile,
   loadFlutterAsset,
   loadHtmlString,
   transparentBackground,
   setCookie,
 }

 class SampleMenu extends StatelessWidget {
   SampleMenu({
     super.key,
     required this.webViewController,
     PlatformWebViewCookieManager? cookieManager,
   }) : cookieManager = cookieManager ??
             PlatformWebViewCookieManager(
               const PlatformWebViewCookieManagerCreationParams(),
             );

   final PlatformWebViewController webViewController;
   late final PlatformWebViewCookieManager cookieManager;

   @override
   Widget build(BuildContext context) {
     return PopupMenuButton<MenuOptions>(
       key: const ValueKey<String>('ShowPopupMenu'),
       onSelected: (MenuOptions value) {
         switch (value) {
           case MenuOptions.showUserAgent:
             _onShowUserAgent();
             break;
           case MenuOptions.listCookies:
             _onListCookies(context);
             break;
           case MenuOptions.clearCookies:
             _onClearCookies(context);
             break;
           case MenuOptions.addToCache:
             _onAddToCache(context);
             break;
           case MenuOptions.listCache:
             _onListCache();
             break;
           case MenuOptions.clearCache:
             _onClearCache(context);
             break;
           case MenuOptions.navigationDelegate:
             _onNavigationDelegateExample();
             break;
           case MenuOptions.doPostRequest:
             _onDoPostRequest();
             break;
           case MenuOptions.loadLocalFile:
             _onLoadLocalFileExample();
             break;
           case MenuOptions.loadFlutterAsset:
             _onLoadFlutterAssetExample();
             break;
           case MenuOptions.loadHtmlString:
             _onLoadHtmlStringExample();
             break;
           case MenuOptions.transparentBackground:
             _onTransparentBackground();
             break;
           case MenuOptions.setCookie:
             _onSetCookie();
             break;
         }
       },
       itemBuilder: (BuildContext context) => <PopupMenuItem<MenuOptions>>[
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.showUserAgent,
           child: Text('Show user agent'),
         ),
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.listCookies,
           child: Text('List cookies'),
         ),
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.clearCookies,
           child: Text('Clear cookies'),
         ),
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.addToCache,
           child: Text('Add to cache'),
         ),
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.listCache,
           child: Text('List cache'),
         ),
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.clearCache,
           child: Text('Clear cache'),
         ),
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.navigationDelegate,
           child: Text('Navigation Delegate example'),
         ),
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.doPostRequest,
           child: Text('Post Request'),
         ),
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.loadHtmlString,
           child: Text('Load HTML string'),
         ),
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.loadLocalFile,
           child: Text('Load local file'),
         ),
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.loadFlutterAsset,
           child: Text('Load Flutter Asset'),
         ),
         const PopupMenuItem<MenuOptions>(
           value: MenuOptions.setCookie,
           child: Text('Set cookie'),
         ),
         const PopupMenuItem<MenuOptions>(
           key: ValueKey<String>('ShowTransparentBackgroundExample'),
           value: MenuOptions.transparentBackground,
           child: Text('Transparent background example'),
         ),
       ],
     );
   }

   Future<void> _onShowUserAgent() {
     // Send a message with the user agent string to the Toaster JavaScript channel we registered
     // with the WebView.
     return webViewController.runJavaScript(
       'Toaster.postMessage("User Agent: " + navigator.userAgent);',
     );
   }

   Future<void> _onListCookies(BuildContext context) async {
     final String cookies = await webViewController
         .runJavaScriptReturningResult('document.cookie') as String;
     if (context.mounted) {
       ScaffoldMessenger.of(context).showSnackBar(SnackBar(
         content: Column(
           mainAxisAlignment: MainAxisAlignment.end,
           mainAxisSize: MainAxisSize.min,
           children: <Widget>[
             const Text('Cookies:'),
             _getCookieList(cookies),
           ],
         ),
       ));
     }
   }

   Future<void> _onAddToCache(BuildContext context) async {
     await webViewController.runJavaScript(
       'caches.open("test_caches_entry"); localStorage["test_localStorage"] = "dummy_entry";',
     );
     if (context.mounted) {
       ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
         content: Text('Added a test entry to cache.'),
       ));
     }
   }

   Future<void> _onListCache() {
     return webViewController.runJavaScript('caches.keys()'
         // ignore: missing_whitespace_between_adjacent_strings
         '.then((cacheKeys) => JSON.stringify({"cacheKeys" : cacheKeys, "localStorage" : localStorage}))'
         '.then((caches) => Toaster.postMessage(caches))');
   }

   Future<void> _onClearCache(BuildContext context) async {
     await webViewController.clearCache();
     await webViewController.clearLocalStorage();
     if (context.mounted) {
       ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
         content: Text('Cache cleared.'),
       ));
     }
   }

   Future<void> _onClearCookies(BuildContext context) async {
     final bool hadCookies = await cookieManager.clearCookies();
     String message = 'There were cookies. Now, they are gone!';
     if (!hadCookies) {
       message = 'There are no cookies.';
     }
     if (context.mounted) {
       ScaffoldMessenger.of(context).showSnackBar(SnackBar(
         content: Text(message),
       ));
     }
   }

   Future<void> _onNavigationDelegateExample() {
     final String contentBase64 = base64Encode(
       const Utf8Encoder().convert(kNavigationExamplePage),
     );
     return webViewController.loadRequest(
       LoadRequestParams(
         uri: Uri.parse('data:text/html;base64,$contentBase64'),
       ),
     );
   }

   Future<void> _onSetCookie() async {
     await cookieManager.setCookie(
       const WebViewCookie(
         name: 'foo',
         value: 'bar',
         domain: 'httpbin.org',
         path: '/anything',
       ),
     );
     await webViewController.loadRequest(LoadRequestParams(
       uri: Uri.parse('https://httpbin.org/anything'),
     ));
   }

   Future<void> _onDoPostRequest() {
     return webViewController.loadRequest(LoadRequestParams(
       uri: Uri.parse('https://httpbin.org/post'),
       method: LoadRequestMethod.post,
       headers: const <String, String>{
         'foo': 'bar',
         'Content-Type': 'text/plain',
       },
       body: Uint8List.fromList('Test Body'.codeUnits),
     ));
   }

   Future<void> _onLoadLocalFileExample() async {
     final String pathToIndex = await _prepareLocalFile();
     await webViewController.loadFile(pathToIndex);
   }

   Future<void> _onLoadFlutterAssetExample() {
     return webViewController.loadFlutterAsset('assets/www/index.html');
   }

   Future<void> _onLoadHtmlStringExample() {
     return webViewController.loadHtmlString(kLocalExamplePage);
   }

   Future<void> _onTransparentBackground() {
     return webViewController.loadHtmlString(kTransparentBackgroundPage);
   }

   Widget _getCookieList(String cookies) {
     if (cookies == '""') {
       return Container();
     }
     final List<String> cookieList = cookies.split(';');
     final Iterable<Text> cookieWidgets =
         cookieList.map((String cookie) => Text(cookie));
     return Column(
       mainAxisAlignment: MainAxisAlignment.end,
       mainAxisSize: MainAxisSize.min,
       children: cookieWidgets.toList(),
     );
   }

   static Future<String> _prepareLocalFile() async {
     final String tmpDir = (await getTemporaryDirectory()).path;
     final File indexFile = File(
         <String>{tmpDir, 'www', 'index.html'}.join(Platform.pathSeparator));

     await indexFile.create(recursive: true);
     await indexFile.writeAsString(kLocalExamplePage);

     return indexFile.path;
   }
 }

 class NavigationControls extends StatelessWidget {
   const NavigationControls({super.key, required this.webViewController});

   final PlatformWebViewController webViewController;

   @override
   Widget build(BuildContext context) {
     return Row(
       children: <Widget>[
         IconButton(
           icon: const Icon(Icons.arrow_back_ios),
           onPressed: () async {
             if (await webViewController.canGoBack()) {
               await webViewController.goBack();
             } else {
               if (context.mounted) {
                 ScaffoldMessenger.of(context).showSnackBar(
                   const SnackBar(content: Text('No back history item')),
                 );
               }
             }
           },
         ),
         IconButton(
           icon: const Icon(Icons.arrow_forward_ios),
           onPressed: () async {
             if (await webViewController.canGoForward()) {
               await webViewController.goForward();
             } else {
               if (context.mounted) {
                 ScaffoldMessenger.of(context).showSnackBar(
                   const SnackBar(content: Text('No forward history item')),
                 );
               }
             }
           },
         ),
         IconButton(
           icon: const Icon(Icons.replay),
           onPressed: () => webViewController.reload(),
         ),
       ],
     );
   }
 }
	// Copyright 2013 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.

	// ignore_for_file: public_member_api_docs

	import 'dart:async';
	import 'dart:convert';
	import 'dart:io';
	import 'dart:typed_data';

	import 'package:flutter/material.dart';
	import 'package:path_provider/path_provider.dart';
	import 'package:webview_flutter_android/webview_flutter_android.dart';
	import 'package:webview_flutter_platform_interface/webview_flutter_platform_interface.dart';

	void main() {
	runApp(const MaterialApp(home: WebViewExample()));
	}

	const String kNavigationExamplePage = '''
	<!DOCTYPE html><html>
	<head><title>Navigation Delegate Example</title></head>
	<body>
	<p>
	The navigation delegate is set to block navigation to the youtube website.
	</p>
	<ul>
	<ul><a href="https://www.youtube.com/">https://www.youtube.com/</a></ul>
	<ul><a href="https://www.google.com/">https://www.google.com/</a></ul>
	</ul>
	</body>
	</html>
	''';

	const String kLocalExamplePage = '''
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<title>Load file or HTML string example</title>
	</head>
	<body>

	<h1>Local demo page</h1>
	<p>
	This is an example page used to demonstrate how to load a local file or HTML
	string using the <a href="https://pub.dev/packages/webview_flutter">Flutter
	webview</a> plugin.
	</p>

	</body>
	</html>
	''';

	const String kTransparentBackgroundPage = '''
	<!DOCTYPE html>
	<html>
	<head>
	<title>Transparent background test</title>
	</head>
	<style type="text/css">
	body { background: transparent; margin: 0; padding: 0; }
	#container { position: relative; margin: 0; padding: 0; width: 100vw; height: 100vh; }
	#shape { background: #FF0000; width: 200px; height: 100%; margin: 0; padding: 0; position: absolute; top: 0; bottom: 0; left: calc(50% - 100px); }
	p { text-align: center; }
	</style>
	<body>
	<div id="container">
	<p>Transparent background test</p>
	<div id="shape"></div>
	</div>
	</body>
	</html>
	''';

	class WebViewExample extends StatefulWidget {
	const WebViewExample({super.key, this.cookieManager});

	final PlatformWebViewCookieManager? cookieManager;

	@override
	State<WebViewExample> createState() => _WebViewExampleState();
	}

	class _WebViewExampleState extends State<WebViewExample> {
	late final PlatformWebViewController _controller;

	@override
	void initState() {
	super.initState();

	_controller = PlatformWebViewController(
	AndroidWebViewControllerCreationParams(),
	)
	..setJavaScriptMode(JavaScriptMode.unrestricted)
	..setBackgroundColor(const Color(0x80000000))
	..setPlatformNavigationDelegate(
	PlatformNavigationDelegate(
	const PlatformNavigationDelegateCreationParams(),
	)
	..setOnProgress((int progress) {
	debugPrint('WebView is loading (progress : $progress%)');
	})
	..setOnPageStarted((String url) {
	debugPrint('Page started loading: $url');
	})
	..setOnPageFinished((String url) {
	debugPrint('Page finished loading: $url');
	})
	..setOnWebResourceError((WebResourceError error) {
	debugPrint('''
	Page resource error:
	code: ${error.errorCode}
	description: ${error.description}
	errorType: ${error.errorType}
	isForMainFrame: ${error.isForMainFrame}
	''');
	})
	..setOnNavigationRequest((NavigationRequest request) {
	if (request.url.startsWith('https://www.youtube.com/')) {
	debugPrint('blocking navigation to ${request.url}');
	return NavigationDecision.prevent;
	}
	debugPrint('allowing navigation to ${request.url}');
	return NavigationDecision.navigate;
	})
	..setOnUrlChange((UrlChange change) {
	debugPrint('url change to ${change.url}');
	}),
	)
	..addJavaScriptChannel(JavaScriptChannelParams(
	name: 'Toaster',
	onMessageReceived: (JavaScriptMessage message) {
	ScaffoldMessenger.of(context).showSnackBar(
	SnackBar(content: Text(message.message)),
	);
	},
	))
	..setOnPlatformPermissionRequest(
	(PlatformWebViewPermissionRequest request) {
	debugPrint(
	'requesting permissions for ${request.types.map((WebViewPermissionResourceType type) => type.name)}',
	);
	request.grant();
	},
	)
	..loadRequest(LoadRequestParams(
	uri: Uri.parse('https://flutter.dev'),
	));
	}

	@override
	Widget build(BuildContext context) {
	return Scaffold(
	backgroundColor: const Color(0xFF4CAF50),
	appBar: AppBar(
	title: const Text('Flutter WebView example'),
	// This drop down menu demonstrates that Flutter widgets can be shown over the web view.
	actions: <Widget>[
	NavigationControls(webViewController: _controller),
	SampleMenu(
	webViewController: _controller,
	cookieManager: widget.cookieManager,
	),
	],
	),
	body: PlatformWebViewWidget(
	PlatformWebViewWidgetCreationParams(controller: _controller),
	).build(context),
	floatingActionButton: favoriteButton(),
	);
	}

	Widget favoriteButton() {
	return FloatingActionButton(
	onPressed: () async {
	final String? url = await _controller.currentUrl();
	if (context.mounted) {
	ScaffoldMessenger.of(context).showSnackBar(
	SnackBar(content: Text('Favorited $url')),
	);
	}
	},
	child: const Icon(Icons.favorite),
	);
	}
	}

	enum MenuOptions {
	showUserAgent,
	listCookies,
	clearCookies,
	addToCache,
	listCache,
	clearCache,
	navigationDelegate,
	doPostRequest,
	loadLocalFile,
	loadFlutterAsset,
	loadHtmlString,
	transparentBackground,
	setCookie,
	}

	class SampleMenu extends StatelessWidget {
	SampleMenu({
	super.key,
	required this.webViewController,
	PlatformWebViewCookieManager? cookieManager,
	}) : cookieManager = cookieManager ??
	PlatformWebViewCookieManager(
	const PlatformWebViewCookieManagerCreationParams(),
	);

	final PlatformWebViewController webViewController;
	late final PlatformWebViewCookieManager cookieManager;

	@override
	Widget build(BuildContext context) {
	return PopupMenuButton<MenuOptions>(
	key: const ValueKey<String>('ShowPopupMenu'),
	onSelected: (MenuOptions value) {
	switch (value) {
	case MenuOptions.showUserAgent:
	_onShowUserAgent();
	break;
	case MenuOptions.listCookies:
	_onListCookies(context);
	break;
	case MenuOptions.clearCookies:
	_onClearCookies(context);
	break;
	case MenuOptions.addToCache:
	_onAddToCache(context);
	break;
	case MenuOptions.listCache:
	_onListCache();
	break;
	case MenuOptions.clearCache:
	_onClearCache(context);
	break;
	case MenuOptions.navigationDelegate:
	_onNavigationDelegateExample();
	break;
	case MenuOptions.doPostRequest:
	_onDoPostRequest();
	break;
	case MenuOptions.loadLocalFile:
	_onLoadLocalFileExample();
	break;
	case MenuOptions.loadFlutterAsset:
	_onLoadFlutterAssetExample();
	break;
	case MenuOptions.loadHtmlString:
	_onLoadHtmlStringExample();
	break;
	case MenuOptions.transparentBackground:
	_onTransparentBackground();
	break;
	case MenuOptions.setCookie:
	_onSetCookie();
	break;
	}
	},
	itemBuilder: (BuildContext context) => <PopupMenuItem<MenuOptions>>[
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.showUserAgent,
	child: Text('Show user agent'),
	),
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.listCookies,
	child: Text('List cookies'),
	),
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.clearCookies,
	child: Text('Clear cookies'),
	),
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.addToCache,
	child: Text('Add to cache'),
	),
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.listCache,
	child: Text('List cache'),
	),
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.clearCache,
	child: Text('Clear cache'),
	),
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.navigationDelegate,
	child: Text('Navigation Delegate example'),
	),
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.doPostRequest,
	child: Text('Post Request'),
	),
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.loadHtmlString,
	child: Text('Load HTML string'),
	),
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.loadLocalFile,
	child: Text('Load local file'),
	),
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.loadFlutterAsset,
	child: Text('Load Flutter Asset'),
	),
	const PopupMenuItem<MenuOptions>(
	value: MenuOptions.setCookie,
	child: Text('Set cookie'),
	),
	const PopupMenuItem<MenuOptions>(
	key: ValueKey<String>('ShowTransparentBackgroundExample'),
	value: MenuOptions.transparentBackground,
	child: Text('Transparent background example'),
	),
	],
	);
	}

	Future<void> _onShowUserAgent() {
	// Send a message with the user agent string to the Toaster JavaScript channel we registered
	// with the WebView.
	return webViewController.runJavaScript(
	'Toaster.postMessage("User Agent: " + navigator.userAgent);',
	);
	}

	Future<void> _onListCookies(BuildContext context) async {
	final String cookies = await webViewController
	.runJavaScriptReturningResult('document.cookie') as String;
	if (context.mounted) {
	ScaffoldMessenger.of(context).showSnackBar(SnackBar(
	content: Column(
	mainAxisAlignment: MainAxisAlignment.end,
	mainAxisSize: MainAxisSize.min,
	children: <Widget>[
	const Text('Cookies:'),
	_getCookieList(cookies),
	],
	),
	));
	}
	}

	Future<void> _onAddToCache(BuildContext context) async {
	await webViewController.runJavaScript(
	'caches.open("test_caches_entry"); localStorage["test_localStorage"] = "dummy_entry";',
	);
	if (context.mounted) {
	ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
	content: Text('Added a test entry to cache.'),
	));
	}
	}

	Future<void> _onListCache() {
	return webViewController.runJavaScript('caches.keys()'
	// ignore: missing_whitespace_between_adjacent_strings
	'.then((cacheKeys) => JSON.stringify({"cacheKeys" : cacheKeys, "localStorage" : localStorage}))'
	'.then((caches) => Toaster.postMessage(caches))');
	}

	Future<void> _onClearCache(BuildContext context) async {
	await webViewController.clearCache();
	await webViewController.clearLocalStorage();
	if (context.mounted) {
	ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
	content: Text('Cache cleared.'),
	));
	}
	}

	Future<void> _onClearCookies(BuildContext context) async {
	final bool hadCookies = await cookieManager.clearCookies();
	String message = 'There were cookies. Now, they are gone!';
	if (!hadCookies) {
	message = 'There are no cookies.';
	}
	if (context.mounted) {
	ScaffoldMessenger.of(context).showSnackBar(SnackBar(
	content: Text(message),
	));
	}
	}

	Future<void> _onNavigationDelegateExample() {
	final String contentBase64 = base64Encode(
	const Utf8Encoder().convert(kNavigationExamplePage),
	);
	return webViewController.loadRequest(
	LoadRequestParams(
	uri: Uri.parse('data:text/html;base64,$contentBase64'),
	),
	);
	}

	Future<void> _onSetCookie() async {
	await cookieManager.setCookie(
	const WebViewCookie(
	name: 'foo',
	value: 'bar',
	domain: 'httpbin.org',
	path: '/anything',
	),
	);
	await webViewController.loadRequest(LoadRequestParams(
	uri: Uri.parse('https://httpbin.org/anything'),
	));
	}

	Future<void> _onDoPostRequest() {
	return webViewController.loadRequest(LoadRequestParams(
	uri: Uri.parse('https://httpbin.org/post'),
	method: LoadRequestMethod.post,
	headers: const <String, String>{
	'foo': 'bar',
	'Content-Type': 'text/plain',
	},
	body: Uint8List.fromList('Test Body'.codeUnits),
	));
	}

	Future<void> _onLoadLocalFileExample() async {
	final String pathToIndex = await _prepareLocalFile();
	await webViewController.loadFile(pathToIndex);
	}

	Future<void> _onLoadFlutterAssetExample() {
	return webViewController.loadFlutterAsset('assets/www/index.html');
	}

	Future<void> _onLoadHtmlStringExample() {
	return webViewController.loadHtmlString(kLocalExamplePage);
	}

	Future<void> _onTransparentBackground() {
	return webViewController.loadHtmlString(kTransparentBackgroundPage);
	}

	Widget _getCookieList(String cookies) {
	if (cookies == '""') {
	return Container();
	}
	final List<String> cookieList = cookies.split(';');
	final Iterable<Text> cookieWidgets =
	cookieList.map((String cookie) => Text(cookie));
	return Column(
	mainAxisAlignment: MainAxisAlignment.end,
	mainAxisSize: MainAxisSize.min,
	children: cookieWidgets.toList(),
	);
	}

	static Future<String> _prepareLocalFile() async {
	final String tmpDir = (await getTemporaryDirectory()).path;
	final File indexFile = File(
	<String>{tmpDir, 'www', 'index.html'}.join(Platform.pathSeparator));

	await indexFile.create(recursive: true);
	await indexFile.writeAsString(kLocalExamplePage);

	return indexFile.path;
	}
	}

	class NavigationControls extends StatelessWidget {
	const NavigationControls({super.key, required this.webViewController});

	final PlatformWebViewController webViewController;

	@override
	Widget build(BuildContext context) {
	return Row(
	children: <Widget>[
	IconButton(
	icon: const Icon(Icons.arrow_back_ios),
	onPressed: () async {
	if (await webViewController.canGoBack()) {
	await webViewController.goBack();
	} else {
	if (context.mounted) {
	ScaffoldMessenger.of(context).showSnackBar(
	const SnackBar(content: Text('No back history item')),
	);
	}
	}
	},
	),
	IconButton(
	icon: const Icon(Icons.arrow_forward_ios),
	onPressed: () async {
	if (await webViewController.canGoForward()) {
	await webViewController.goForward();
	} else {
	if (context.mounted) {
	ScaffoldMessenger.of(context).showSnackBar(
	const SnackBar(content: Text('No forward history item')),
	);
	}
	}
	},
	),
	IconButton(
	icon: const Icon(Icons.replay),
	onPressed: () => webViewController.reload(),
	),
	],
	);
	}
	}