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import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';
void main() => runApp(
MaterialApp(home: WebViewExample(), debugShowCheckedModeBanner: false));
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><a href="https://www.google.com/">https://nodejs.org/en</a></ul>
</ul>
</body>
</html>
''';
class WebViewExample extends StatefulWidget {
@override
_WebViewExampleState createState() => _WebViewExampleState();
}
WebViewController controllerGlobal;
Future<bool> _exitApp(BuildContext context) async {
if (await controllerGlobal.canGoBack()) {
controllerGlobal.goBack();
} else {
return Future.value(false);
}
}
class _WebViewExampleState extends State<WebViewExample> {
final Completer<WebViewController> _controller =
Completer<WebViewController>();
final _key = UniqueKey();
num _stackToView = 1;
void _handleLoad(String value) {
setState(() {
_stackToView = 0;
});
}
@override
Widget build(BuildContext context) {
return WillPopScope(
onWillPop: () => _exitApp(context),
child: Scaffold(
appBar: PreferredSize(
preferredSize: Size(double.infinity, 1),
child: Visibility(
visible: true,
child: AppBar(
backgroundColor: Color.fromARGB(200, 18, 29, 50),
// This drop down menu demonstrates that Flutter widgets can be shown over the web view.
actions: <Widget>[
NavigationControls(_controller.future),
],
)),
),
body: IndexedStack(
index: _stackToView,
children: <Widget>[
Builder(builder: (BuildContext context) {
return WebView(
initialUrl: 'https://www.developerlibs.com/',
onPageFinished: _handleLoad,
javascriptMode: JavascriptMode.unrestricted,
onWebViewCreated: (WebViewController webViewController) {
_controller.complete(webViewController);
},
javascriptChannels: <JavascriptChannel>[
_toasterJavascriptChannel(context),
].toSet(),
);
}),
Container(
child: Center(child: CircularProgressIndicator(),)
)
],
)),
);
}
JavascriptChannel _toasterJavascriptChannel(BuildContext context) {
return JavascriptChannel(
name: 'Toaster',
onMessageReceived: (JavascriptMessage message) {
Scaffold.of(context).showSnackBar(
SnackBar(content: Text(message.message)),
);
});
}
}
enum MenuOptions {
showUserAgent,
listCookies,
clearCookies,
addToCache,
listCache,
clearCache,
navigationDelegate,
}
class NavigationControls extends StatelessWidget {
const NavigationControls(this._webViewControllerFuture)
: assert(_webViewControllerFuture != null);
final Future<WebViewController> _webViewControllerFuture;
@override
Widget build(BuildContext context) {
return FutureBuilder<WebViewController>(
future: _webViewControllerFuture,
builder:
(BuildContext context, AsyncSnapshot<WebViewController> snapshot) {
final bool webViewReady =
snapshot.connectionState == ConnectionState.done;
final WebViewController controller = snapshot.data;
controllerGlobal = controller;
return Row(
children: <Widget>[],
);
},
);
}
}
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