Create room without connecting (#49)

* initial commit

* fix example compile

* format

* clean up

* fix check

* missing import

example/lib/pages/room.dart

@@ -68,13 +68,13 @@ class _RoomPageState extends State<RoomPage> {
     if (result != true) return;
     // video will fail when running in ios simulator
     try {
-      await widget.room.localParticipant.setCameraEnabled(true);
+      await widget.room.localParticipant?.setCameraEnabled(true);
     } catch (error) {
       print('could not publish video: $error');
       await context.showErrorDialog(error);
     }
     try {
-      await widget.room.localParticipant.setMicrophoneEnabled(true);
+      await widget.room.localParticipant?.setMicrophoneEnabled(true);
     } catch (error) {
       print('could not publish audio: $error');
       await context.showErrorDialog(error);
@@ -117,10 +117,13 @@ class _RoomPageState extends State<RoomPage> {
           b.joinedAt.millisecondsSinceEpoch;
     });
 
-    if (participants.length > 1) {
-      participants.insert(1, widget.room.localParticipant);
-    } else {
-      participants.add(widget.room.localParticipant);
+    final localParticipant = widget.room.localParticipant;
+    if (localParticipant != null) {
+      if (participants.length > 1) {
+        participants.insert(1, localParticipant);
+      } else {
+        participants.add(localParticipant);
+      }
     }
     setState(() {
       this.participants = participants;
@@ -147,10 +150,12 @@ class _RoomPageState extends State<RoomPage> {
                 ),
               ),
             ),
-            SafeArea(
-              top: false,
-              child: ControlsWidget(widget.room),
-            ),
+            if (widget.room.localParticipant != null)
+              SafeArea(
+                top: false,
+                child:
+                    ControlsWidget(widget.room, widget.room.localParticipant!),
+              ),
           ],
         ),
       );

example/lib/widgets/controls.dart

@@ -14,11 +14,11 @@ class ControlsWidget extends StatefulWidget {
   final Room room;
   final LocalParticipant participant;
 
-  ControlsWidget(
-    this.room, {
+  const ControlsWidget(
+    this.room,
+    this.participant, {
     Key? key,
-  })  : participant = room.localParticipant,
-        super(key: key);
+  }) : super(key: key);
 
   @override
   State<StatefulWidget> createState() => _ControlsWidgetState();
@@ -132,7 +132,7 @@ class _ControlsWidgetState extends State<ControlsWidget> {
   void _onTapSendData() async {
     final result = await context.showSendDataDialog();
     if (result == true) {
-      await widget.room.localParticipant.publishData(
+      await widget.participant.publishData(
         utf8.encode('This is a sample data message'),
       );
     }