Added getSourceIds to the controller

android/src/main/java/com/mapbox/mapboxgl/MapboxMapController.java

@@ -1376,6 +1376,25 @@ public void onFailure(@NonNull Exception exception) {
           result.success(reply);
           break;
         }
+      case "style#getSourceIds":
+      {
+        if (style == null) {
+          result.error(
+                  "STYLE IS NULL",
+                  "The style is null. Has onStyleLoaded() already been invoked?",
+                  null);
+        }
+        Map<String, Object> reply = new HashMap<>();
+
+        List<String> sourceIds = new ArrayList<>();
+        for (Source source : style.getSources()) {
+          sourceIds.add(source.getId());
+        }
+
+        reply.put("sources", sourceIds);
+        result.success(reply);
+        break;
+      }
       default:
         result.notImplemented();
     }

ios/Classes/MapboxMapController.swift

@@ -765,6 +765,17 @@ class MapboxMapController: NSObject, FlutterPlatformView, MGLMapViewDelegate, Ma
             var reply = [String: NSObject]()
             reply["layers"] = layerIds as NSObject
             result(reply)
+
+        case "style#getSrouceIds":
+            var sourceIds = [String]()
+
+            guard let style = mapView.style else { return }
+
+            style.sources.forEach { source in sourceIds.append(source.identifier) }
+
+            var reply = [String: NSObject]()
+            reply["sources"] = sourceIds as NSObject
+            result(reply)
 
         case "style#getFilter":
             guard let arguments = methodCall.arguments as? [String: Any] else { return }

lib/src/controller.dart

@@ -1270,6 +1270,12 @@ class MaplibreMapController extends ChangeNotifier {
     return _mapboxGlPlatform.getLayerIds();
   }
 
+  Future<List<String>> getSourceIds() async {
+    return (await _mapboxGlPlatform.getSourceIds())
+        .whereType<String>()
+        .toList();
+  }
+
   @override
   void dispose() {
     super.dispose();

maplibre_gl_platform_interface/lib/src/mapbox_gl_platform_interface.dart

@@ -91,6 +91,8 @@ abstract class MapLibreGlPlatform {
 
   Future<List> getLayerIds();
 
+  Future<List> getSourceIds();
+
   Future<void> setFilter(String layerId, dynamic filter);
 
   Future<dynamic> getFilter(String layerId);

maplibre_gl_platform_interface/lib/src/method_channel_mapbox_gl.dart

@@ -753,4 +753,15 @@ class MethodChannelMaplibreGl extends MapLibreGlPlatform {
       return new Future.error(e);
     }
   }
+
+  @override
+  Future<List> getSourceIds() async {
+    try {
+      final Map<dynamic, dynamic> reply =
+          await _channel.invokeMethod('style#getSourceIds');
+      return reply['sources'].map((it) => it.toString()).toList();
+    } on PlatformException catch (e) {
+      return new Future.error(e);
+    }
+  }
 }

maplibre_gl_web/lib/src/mapbox_web_gl_platform.dart

@@ -1045,4 +1045,9 @@ class MaplibreMapController extends MapLibreGlPlatform
   Future<List> getLayerIds() async {
     throw UnimplementedError();
   }
+
+  @override
+  Future<List> getSourceIds() async {
+    throw UnimplementedError();
+  }
 }