add: flutter scaffolding, outlines for WebRTC conn

ui/lib/call.dart

@@ -0,0 +1,74 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_webrtc/flutter_webrtc.dart';
+import 'package:logger/logger.dart';
+
+class Call extends StatefulWidget {
+  final String host;
+  const Call({required this.host, super.key});
+
+  @override
+  _CallState createState() => _CallState();
+}
+
+class _CallState extends State<Call> {
+  Logger logger = Logger();
+  RTCVideoRenderer _remoteRenderer = RTCVideoRenderer();
+
+  void _connect(BuildContext context) async {}
+
+  Future<Session> _createSesson() async {
+    RTCPeerConnection peerConnection = await createPeerConnection({
+      // Ice servers; just use the Google one for now
+      'iceServers': [
+        {'url': 'stun:stun.l.google.com:19302'}
+      ],
+    }, {
+      /* Empty config */
+    });
+
+    peerConnection.onAddStream = (stream) {
+      // Stream has been added; connect it to our renderer
+      _remoteRenderer.srcObject = stream;
+    };
+
+    peerConnection.onIceCandidate = (candidate) {
+      if (candidate.candidate == null) {
+        logger.i("Out of candidates");
+        return;
+      }
+
+      // Send the candidate on to the signaling server
+    };
+
+    peerConnection.onIceConnectionState = (state) {};
+
+    peerConnection.onRemoveStream = (stream) {};
+
+    peerConnection.onDataChannel = (channel) {};
+
+    // Get list of candidates from signaling server
+    for (final remoteCandidate in []) {
+      peerConnection.addCandidate(remoteCandidate);
+    }
+    // This will find the intersection of my candidates and the remote,
+    // then propose one to use
+    var offer = peerConnection.createOffer();
+    // Send offer through signaling server
+    logger.i("Offer is $offer");
+
+    var session = Session(peerConnection);
+    return session;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return RTCVideoView(_remoteRenderer);
+  }
+}
+
+class Session {
+  RTCPeerConnection peerConnection;
+
+  Session(this.peerConnection);
+  List<RTCIceCandidate> remoteCandidates = [];
+}

ui/lib/main.dart

@@ -0,0 +1,104 @@
+import 'package:flutter/material.dart';
+import 'package:ui/call.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  // This widget is the root of your application.
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Flutter Demo',
+      theme: ThemeData(
+        // This is the theme of your application.
+        //
+        // TRY THIS: Try running your application with "flutter run". You'll see
+        // the application has a blue toolbar. Then, without quitting the app,
+        // try changing the seedColor in the colorScheme below to Colors.green
+        // and then invoke "hot reload" (save your changes or press the "hot
+        // reload" button in a Flutter-supported IDE, or press "r" if you used
+        // the command line to start the app).
+        //
+        // Notice that the counter didn't reset back to zero; the application
+        // state is not lost during the reload. To reset the state, use hot
+        // restart instead.
+        //
+        // This works for code too, not just values: Most code changes can be
+        // tested with just a hot reload.
+        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
+        useMaterial3: true,
+      ),
+      home: const MyHomePage(title: 'Flutter Demo Home Page'),
+    );
+  }
+}
+
+class MyHomePage extends StatefulWidget {
+  const MyHomePage({super.key, required this.title});
+
+  // This widget is the home page of your application. It is stateful, meaning
+  // that it has a State object (defined below) that contains fields that affect
+  // how it looks.
+
+  // This class is the configuration for the state. It holds the values (in this
+  // case the title) provided by the parent (in this case the App widget) and
+  // used by the build method of the State. Fields in a Widget subclass are
+  // always marked "final".
+
+  final String title;
+
+  @override
+  State<MyHomePage> createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+  int _counter = 0;
+
+  void _incrementCounter() {
+    setState(() {
+      // This call to setState tells the Flutter framework that something has
+      // changed in this State, which causes it to rerun the build method below
+      // so that the display can reflect the updated values. If we changed
+      // _counter without calling setState(), then the build method would not be
+      // called again, and so nothing would appear to happen.
+      _counter++;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // This method is rerun every time setState is called, for instance as done
+    // by the _incrementCounter method above.
+    //
+    // The Flutter framework has been optimized to make rerunning build methods
+    // fast, so that you can just rebuild anything that needs updating rather
+    // than having to individually change instances of widgets.
+    return Scaffold(
+      appBar: AppBar(
+        // TRY THIS: Try changing the color here to a specific color (to
+        // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
+        // change color while the other colors stay the same.
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        // Here we take the value from the MyHomePage object that was created by
+        // the App.build method, and use it to set our appbar title.
+        title: Text(widget.title),
+      ),
+      body: const Center(
+        // Center is a layout widget. It takes a single child and positions it
+        // in the middle of the parent.
+        child: Call(
+          host: '',
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: _incrementCounter,
+        tooltip: 'Increment',
+        child: const Icon(Icons.add),
+      ), // This trailing comma makes auto-formatting nicer for build methods.
+    );
+  }
+}