mirror of
https://github.com/GitJournal/GitJournal.git
synced 2025-06-28 18:03:14 +08:00
Add an experimental Katex rendering Widget
Related to #125 This still needs to be integrated into the Flutter Markdown renderer. But the good news is that this works! It currently requires network access to download the katex scripts. It does NOT send the katex string to any server. The rendering is performed in the app.
This commit is contained in:
Vishesh Handa
@ -64,5 +64,12 @@
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<array>
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<string>itms</string>
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</array>
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<key>NSAppTransportSecurity</key>
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<dict>
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<key>NSAllowsArbitraryLoads</key>
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<true/>
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<key>NSAllowsArbitraryLoadsInWebContent</key>
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<true/>
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</dict>
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</dict>
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</plist>
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@ -1,281 +0,0 @@
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import 'dart:async';
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import 'dart:typed_data';
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import 'package:flutter/material.dart';
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import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
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const kAndroidUserAgent =
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'Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Mobile Safari/537.36';
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String selectedUrl = 'https://gitjournal.io/test_katex.html';
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void main() {
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WidgetsFlutterBinding.ensureInitialized();
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runApp(MyApp());
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}
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class MyApp extends StatelessWidget {
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final flutterWebViewPlugin = FlutterWebviewPlugin();
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Flutter WebView Demo',
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theme: ThemeData(
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primarySwatch: Colors.blue,
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),
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routes: {
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'/': (_) => const MyHomePage(title: 'Flutter WebView Demo'),
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'/widget': (_) {
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return WebviewScaffold(
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url: selectedUrl,
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appBar: AppBar(
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title: const Text('Widget WebView'),
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),
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withZoom: true,
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withLocalStorage: true,
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hidden: true,
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initialChild: Container(
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color: Colors.redAccent,
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child: const Center(
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child: Text('Waiting.....'),
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),
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),
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bottomNavigationBar: BottomAppBar(
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child: Row(
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children: <Widget>[
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IconButton(
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icon: const Icon(Icons.arrow_back_ios),
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onPressed: flutterWebViewPlugin.goBack,
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),
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IconButton(
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icon: const Icon(Icons.arrow_forward_ios),
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onPressed: () {
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print("");
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flutterWebViewPlugin.goForward();
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},
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),
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IconButton(
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icon: const Icon(Icons.autorenew),
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onPressed: () {
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print("");
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flutterWebViewPlugin.reload();
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},
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),
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],
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),
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),
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);
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},
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},
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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const MyHomePage({Key key, this.title}) : super(key: key);
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final String title;
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@override
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_MyHomePageState createState() => _MyHomePageState();
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}
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class _MyHomePageState extends State<MyHomePage> {
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// Instance of WebView plugin
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final flutterWebViewPlugin = FlutterWebviewPlugin();
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// On destroy stream
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StreamSubscription _onDestroy;
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// On urlChanged stream
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StreamSubscription<String> _onUrlChanged;
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// On urlChanged stream
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StreamSubscription<WebViewStateChanged> _onStateChanged;
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StreamSubscription<WebViewHttpError> _onHttpError;
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StreamSubscription<double> _onProgressChanged;
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StreamSubscription<double> _onScrollYChanged;
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StreamSubscription<double> _onScrollXChanged;
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final _urlCtrl = TextEditingController(text: selectedUrl);
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final _codeCtrl = TextEditingController(text: 'window.navigator.userAgent');
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final _scaffoldKey = GlobalKey<ScaffoldState>();
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final _history = [];
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Uint8List imageData = Uint8List(0);
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@override
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void initState() {
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super.initState();
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flutterWebViewPlugin.close();
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_urlCtrl.addListener(() {
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selectedUrl = _urlCtrl.text;
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});
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// Add a listener to on destroy WebView, so you can make came actions.
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_onDestroy = flutterWebViewPlugin.onDestroy.listen((_) {
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if (mounted) {
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// Actions like show a info toast.
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_scaffoldKey.currentState
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.showSnackBar(const SnackBar(content: Text('Webview Destroyed')));
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}
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});
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// Add a listener to on url changed
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_onUrlChanged = flutterWebViewPlugin.onUrlChanged.listen((String url) {
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if (mounted) {
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setState(() {
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_history.add('onUrlChanged: $url');
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});
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}
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});
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_onScrollYChanged =
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flutterWebViewPlugin.onScrollYChanged.listen((double y) {
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if (mounted) {
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setState(() {
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_history.add('Scroll in Y Direction: $y');
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});
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}
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});
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_onScrollXChanged =
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flutterWebViewPlugin.onScrollXChanged.listen((double x) {
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if (mounted) {
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setState(() {
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_history.add('Scroll in X Direction: $x');
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});
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}
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});
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_onStateChanged =
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flutterWebViewPlugin.onStateChanged.listen((WebViewStateChanged state) {
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if (mounted) {
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setState(() {
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_history.add('onStateChanged: ${state.type} ${state.url}');
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});
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}
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});
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_onHttpError =
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flutterWebViewPlugin.onHttpError.listen((WebViewHttpError error) {
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if (mounted) {
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setState(() {
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_history.add('onHttpError: ${error.code} ${error.url}');
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});
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}
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});
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}
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@override
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void dispose() {
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// Every listener should be canceled, the same should be done with this stream.
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_onDestroy.cancel();
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_onUrlChanged.cancel();
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_onStateChanged.cancel();
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_onHttpError.cancel();
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_onProgressChanged.cancel();
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_onScrollXChanged.cancel();
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_onScrollYChanged.cancel();
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flutterWebViewPlugin.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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key: _scaffoldKey,
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appBar: AppBar(
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title: const Text('Plugin example app'),
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),
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body: SingleChildScrollView(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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if (imageData.isNotEmpty) Image.memory(imageData),
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Container(
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padding: const EdgeInsets.all(24.0),
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child: TextField(controller: _urlCtrl),
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),
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RaisedButton(
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onPressed: () {
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flutterWebViewPlugin.launch(selectedUrl, hidden: true);
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},
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child: const Text('Open "hidden" Webview'),
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),
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Container(
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padding: const EdgeInsets.all(24.0),
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child: TextField(controller: _codeCtrl),
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),
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RaisedButton(
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onPressed: () {
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var js =
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"""katex.render("\\\\pm\\\\sqrt{a^2 + b^2}", document.body, {
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throwOnError: false
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});""";
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final future = flutterWebViewPlugin.evalJavascript(js);
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future.then((String result) async {
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print("Eval done $result");
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setState(() {
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_history.add('eval: $result');
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});
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var _imageData = await flutterWebViewPlugin.takeScreenshot();
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print("Got $_imageData");
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setState(() {
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imageData = _imageData;
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});
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//flutterWebViewPlugin.close();
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});
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},
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child: const Text('Eval javascript katex'),
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),
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RaisedButton(
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onPressed: () {
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setState(() {
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print("");
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_history.clear();
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});
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flutterWebViewPlugin.close();
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},
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child: const Text('Close'),
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),
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RaisedButton(
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onPressed: () {
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flutterWebViewPlugin.getCookies().then((m) {
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setState(() {
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_history.add('cookies: $m');
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});
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});
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},
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child: const Text('Cookies'),
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),
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Text(_history.join('\n'))
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],
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),
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),
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);
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}
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}
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/*
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html2canvas(document.body).then(function(canvas) {
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var img = canvas.toDataURL("image/png");
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console.log(img);
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});
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*/
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92
lib/widgets/katex_widget.dart
Normal file
92
lib/widgets/katex_widget.dart
Normal file
@ -0,0 +1,92 @@
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import 'dart:io';
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import 'package:flutter/material.dart';
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import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
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import 'package:path/path.dart' as p;
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class KatexWidget extends StatefulWidget {
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final String input;
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KatexWidget(this.input, {Key key}) : super(key: key);
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@override
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_KatexWidgetState createState() => _KatexWidgetState();
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}
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class _KatexWidgetState extends State<KatexWidget> {
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String imagePath;
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JavascriptChannel jsChannel;
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final flutterWebViewPlugin = FlutterWebviewPlugin();
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final selectedUrl = 'https://gitjournal.io/test_katex.html';
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@override
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void initState() {
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super.initState();
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jsChannel = JavascriptChannel(
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name: 'Print',
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onMessageReceived: (JavascriptMessage message) {
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print("-----JS CHANNEL ----");
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print(message.message);
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var uri = UriData.parse(message.message);
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var tmpFile = p.join(Directory.systemTemp.path, "katex.png");
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File(tmpFile).writeAsBytesSync(uri.contentAsBytes());
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setState(() {
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print("State has been set");
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imagePath = tmpFile;
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});
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},
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);
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flutterWebViewPlugin.onStateChanged.listen((WebViewStateChanged state) {
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if (!mounted) return;
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if (state.type == WebViewState.finishLoad) {
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_renderKatex();
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}
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});
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flutterWebViewPlugin.close();
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flutterWebViewPlugin.launch(
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selectedUrl,
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hidden: true,
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javascriptChannels: {jsChannel},
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withJavascript: true,
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);
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}
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@override
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void dispose() {
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flutterWebViewPlugin.dispose();
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super.dispose();
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}
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void _renderKatex() {
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var katex = widget.input;
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var js = """katex.render("$katex", document.body, {
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throwOnError: false
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});
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html2canvas(document.body).then(function(canvas) {
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var img = canvas.toDataURL("image/png");
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Print.postMessage(img);
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});
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""";
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flutterWebViewPlugin.evalJavascript(js);
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}
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@override
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Widget build(BuildContext context) {
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if (imagePath == null) {
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return Container();
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}
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print("Building Network Image");
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return Image.file(File(imagePath));
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}
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}
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10
pubspec.lock
10
pubspec.lock
@ -318,12 +318,10 @@ packages:
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flutter_webview_plugin:
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dependency: "direct main"
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description:
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path: "."
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ref: HEAD
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resolved-ref: "045bd6357ce81162d05e367133a95a53ad291451"
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url: "https://github.com/breez/flutter_webview_plugin.git"
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source: git
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version: "0.3.0+2"
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name: flutter_webview_plugin
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url: "https://pub.dartlang.org"
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source: hosted
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version: "0.3.11"
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font_awesome_flutter:
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dependency: "direct main"
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description:
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@ -50,8 +50,7 @@ dependencies:
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ssh_key:
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git: https://github.com/GitJournal/ssh_key.git
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isolate: ^2.0.3
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flutter_webview_plugin:
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git: https://github.com/breez/flutter_webview_plugin.git
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flutter_webview_plugin: ^0.3.11
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image_picker: ^0.6.6+1
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easy_localization: ^2.2.1
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easy_localization_loader: ^0.0.2
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Reference in New Issue
Block a user