Prevent screen-sharing on flutter web mobile. (#486)

* Prevent screen-sharing on flutter web mobile.

* import sorter.

Author: cloudwebrtc

example/lib/widgets/controls.dart

@@ -197,6 +197,13 @@ class _ControlsWidgetState extends State<ControlsWidget> {
       await participant.publishVideoTrack(track);
       return;
     }
+
+    if (lkPlatformIsWebMobile()) {
+      await context
+          .showErrorDialog('Screen share is not supported on mobile web');
+      return;
+    }
+
     await participant.setScreenShareEnabled(true, captureScreenAudio: true);
   }
 

lib/src/participant/local.dart

@@ -537,6 +537,12 @@ class LocalParticipant extends Participant<LocalTrackPublication> {
       CameraCaptureOptions? cameraCaptureOptions,
       ScreenShareCaptureOptions? screenShareCaptureOptions}) async {
     logger.fine('setSourceEnabled(source: $source, enabled: $enabled)');
+
+    if (TrackSource.screenShareVideo == source && lkPlatformIsWebMobile()) {
+      throw TrackCreateException(
+          'Screen sharing is not supported on mobile devices');
+    }
+
     final publication = getTrackPublicationBySource(source);
     if (publication != null) {
       if (enabled) {

lib/src/support/platform.dart

@@ -24,6 +24,8 @@ bool lkPlatformIs(PlatformType type) => lkPlatform() == type;
 bool lkPlatformIsMobile() =>
     [PlatformType.iOS, PlatformType.android].contains(lkPlatform());
 
+bool lkPlatformIsWebMobile() => lkPlatformIsWebMobileImplementation();
+
 bool lkPlatformIsDesktop() => [
       PlatformType.macOS,
       PlatformType.windows,

lib/src/support/platform/io.dart

@@ -26,6 +26,10 @@ PlatformType lkPlatformImplementation() {
   throw UnsupportedError('Unknown Platform');
 }
 
+bool lkPlatformIsWebMobileImplementation() {
+  return false;
+}
+
 bool lkE2EESupportedImplementation() {
   return [
     PlatformType.windows,

lib/src/support/platform/web.dart

@@ -14,12 +14,19 @@
 
 import 'dart:js' as js;
 
+import 'package:flutter/foundation.dart';
+
 import 'package:platform_detect/platform_detect.dart';
 
 import '../platform.dart';
 
 PlatformType lkPlatformImplementation() => PlatformType.web;
 
+bool lkPlatformIsWebMobileImplementation() {
+  return (defaultTargetPlatform == TargetPlatform.iOS ||
+      defaultTargetPlatform == TargetPlatform.android);
+}
+
 bool lkE2EESupportedImplementation() {
   return isInsertableStreamSupported() || isScriptTransformSupported();
 }

lib/src/track/local/video.dart

@@ -18,6 +18,7 @@ import 'package:collection/collection.dart';
 import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
 
 import '../../events.dart';
+import '../../exceptions.dart';
 import '../../logger.dart';
 import '../../options.dart';
 import '../../proto/livekit_models.pb.dart' as lk_models;
@@ -187,6 +188,10 @@ class LocalVideoTrack extends LocalTrack with VideoTrack {
   static Future<LocalVideoTrack> createScreenShareTrack([
     ScreenShareCaptureOptions? options,
   ]) async {
+    if (lkPlatformIsWebMobile()) {
+      throw TrackCreateException(
+          'Screen sharing is not supported on mobile devices');
+    }
     options ??= const ScreenShareCaptureOptions();
 
     final stream = await LocalTrack.createStream(options);
@@ -206,6 +211,10 @@ class LocalVideoTrack extends LocalTrack with VideoTrack {
   static Future<List<LocalTrack>> createScreenShareTracksWithAudio([
     ScreenShareCaptureOptions? options,
   ]) async {
+    if (lkPlatformIsWebMobile()) {
+      throw TrackCreateException(
+          'Screen sharing is not supported on mobile devices');
+    }
     if (options == null) {
       options = const ScreenShareCaptureOptions(captureScreenAudio: true);
     } else {