Room recording event (#252)

* feat: Add room reocording reminder.

* chore: comment for recording event.

example/lib/exts.dart

@@ -136,6 +136,23 @@ extension LKExampleExt on BuildContext {
         ),
       );
 
+  Future<bool?> showRecordingStatusChangedDialog(bool isActiveRecording) =>
+      showDialog<bool>(
+        context: this,
+        builder: (ctx) => AlertDialog(
+          title: const Text('Room recording reminder'),
+          content: Text(isActiveRecording
+              ? 'Room recording is active.'
+              : 'Room recording is stoped.'),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(ctx, true),
+              child: const Text('OK'),
+            ),
+          ],
+        ),
+      );
+
   Future<bool?> showSubscribePermissionDialog() => showDialog<bool>(
         context: this,
         builder: (ctx) => AlertDialog(

example/lib/pages/room.dart

@@ -61,6 +61,9 @@ class _RoomPageState extends State<RoomPage> {
       WidgetsBindingCompatible.instance
           ?.addPostFrameCallback((timeStamp) => Navigator.pop(context));
     })
+    ..on<RoomRecordingStatusChanged>((event) {
+      context.showRecordingStatusChangedDialog(event.activeRecording);
+    })
     ..on<LocalTrackPublishedEvent>((_) => _sortParticipants())
     ..on<LocalTrackUnpublishedEvent>((_) => _sortParticipants())
     ..on<DataReceivedEvent>((event) {