feat: added set style method on controller

maplibre_gl/android/src/main/java/org/maplibre/maplibregl/MapLibreMapController.java

@@ -1621,6 +1621,27 @@ public void onFailure(@NonNull Exception exception) {
         result.success(reply);
         break;
       }
+      case "style#setStyle":
+      {
+        // Getting style json, url, path etc. from the flutter side
+        String styleString = call.argument("style");
+
+        // Checking if style is null or not
+        if (styleString != null) {
+          // If style is not null setting style
+          setStyleString(styleString);
+          result.success(null);
+        } else {
+
+          // else throwing error
+          result.error(
+                  "STYLE STRING IS NULL",
+                  "The style string is null.",
+                  null
+          );
+        }
+        break;
+      }
       default:
         result.notImplemented();
     }

maplibre_gl/ios/maplibre_gl/Sources/maplibre_gl/MapLibreMapController.swift

@@ -542,7 +542,7 @@ class MapLibreMapController: NSObject, FlutterPlatformView, MLNMapViewDelegate,
                 maximumZoomLevel: maxzoom,
                 properties: properties
             )
-          
+
             switch addResult {
             case .success: result(nil)
             case let .failure(error): result(error.flutterError)
@@ -967,6 +967,31 @@ class MapLibreMapController: NSObject, FlutterPlatformView, MLNMapViewDelegate,
             reply["filter"] = currentLayerFilter as NSObject
             result(reply)
 
+        case "style#setStyle":
+            if let arguments = methodCall.arguments as? [String: Any] {
+              if let style = arguments["style"] as? String {
+                setStyleString(styleString: style)
+                result(nil)
+              } else {
+                // Error for missing style key in argument
+                result(
+                    FlutterError(
+                        code: "invalidStyleString",
+                        message: "Missing style key in arguments",
+                        details: nil
+                    )
+                )
+              }
+            } else {
+              // Error for invalid arguments type
+              result(
+                  FlutterError(
+                      code: "invalidArgumentsType",
+                      message: "Arguments not of type [String: Any]",
+                      details: nil
+                  )
+              )
+            }
         default:
             result(FlutterMethodNotImplemented)
         }
@@ -1226,7 +1251,7 @@ class MapLibreMapController: NSObject, FlutterPlatformView, MLNMapViewDelegate,
             }
         }
     }
-    
+
     private func validateBeforeLayerAdd(
         sourceId: String,
         layerId: String
@@ -1590,7 +1615,7 @@ class MapLibreMapController: NSObject, FlutterPlatformView, MLNMapViewDelegate,
     }
 
     func addSource(sourceId: String, properties: [String: Any]) -> Result<Void, MethodCallError> {
-        guard let style = mapView.style else { 
+        guard let style = mapView.style else {
             return .failure(.styleNotFound)
         }
         guard style.source(withIdentifier: sourceId) == nil else {
@@ -1640,7 +1665,7 @@ class MapLibreMapController: NSObject, FlutterPlatformView, MLNMapViewDelegate,
         return .failure(.invalidSourceType(
             details: "Source '\(sourceId)' does not support type '\(type)'."
         ))
-       
+
     }
 
     func mapViewDidBecomeIdle(_: MLNMapView) {
@@ -1675,7 +1700,7 @@ class MapLibreMapController: NSObject, FlutterPlatformView, MLNMapViewDelegate,
 
     func addSourceGeojson(sourceId: String, geojson: String) -> Result<Void, MethodCallError> {
         do{
-            guard let style = mapView.style else { 
+            guard let style = mapView.style else {
                 return .failure(.styleNotFound)
             }
             guard style.source(withIdentifier: sourceId) == nil else {
@@ -1696,7 +1721,7 @@ class MapLibreMapController: NSObject, FlutterPlatformView, MLNMapViewDelegate,
     }
 
     func setSource(sourceId: String, geojson: String) -> Result<Void, MethodCallError> {
-        guard let style = mapView.style else { 
+        guard let style = mapView.style else {
             return .failure(.styleNotFound)
         }
 
@@ -1716,10 +1741,10 @@ class MapLibreMapController: NSObject, FlutterPlatformView, MLNMapViewDelegate,
         }
 
     }
-    
+
 
     func setFeature(sourceId: String, geojsonFeature: String) -> Result<Void, MethodCallError> {
-        guard let style = mapView.style else { 
+        guard let style = mapView.style else {
             return .failure(.styleNotFound)
         }
         do {

maplibre_gl/lib/src/controller.dart

@@ -1437,6 +1437,20 @@ class MapLibreMapController extends ChangeNotifier {
         .toList();
   }
 
+  /// Method to set style string
+  /// A MapLibre GL style document defining the map's appearance.
+  /// The style document specification is at [https://maplibre.org/maplibre-style-spec].
+  /// A short introduction can be found in the documentation of the [maplibre_gl] library.
+  /// The [styleString] supports following formats:
+  ///
+  /// 1. Passing the URL of the map style. This should be a custom map style served remotely using a URL that start with 'http(s)://'
+  /// 2. Passing the style as a local asset. Create a JSON file in the `assets` and add a reference in `pubspec.yml`. Set the style string to the relative path for this asset in order to load it into the map.
+  /// 3. Passing the style as a local file. create an JSON file in app directory (e.g. ApplicationDocumentsDirectory). Set the style string to the absolute path of this JSON file.
+  /// 4. Passing the raw JSON of the map style. This is only supported on Android.
+  Future<void> setStyle(String styleString) async {
+    return _maplibrePlatform.setStyle(styleString);
+  }
+
   @override
   void dispose() {
     super.dispose();

maplibre_gl_example/lib/local_style.dart

@@ -51,25 +51,33 @@ class LocalStyleState extends State<LocalStyle> {
 
   void _onMapCreated(MapLibreMapController controller) {
     mapController = controller;
+
+    // Adding style to the map with some delay
+    Future.delayed(
+      const Duration(milliseconds: 250),
+      () async {
+        if (styleAbsoluteFilePath != null) {
+          await mapController?.setStyle(styleAbsoluteFilePath!);
+        }
+      },
+    );
   }
 
   @override
   Widget build(BuildContext context) {
-    final styleAbsoluteFilePath = this.styleAbsoluteFilePath;
-
     if (styleAbsoluteFilePath == null) {
       return const Scaffold(
         body: Center(child: Text('Creating local style file...')),
       );
     }
 
     return Scaffold(
-        body: MapLibreMap(
-      styleString: styleAbsoluteFilePath,
-      onMapCreated: _onMapCreated,
-      initialCameraPosition: const CameraPosition(target: LatLng(0.0, 0.0)),
-      onStyleLoadedCallback: onStyleLoadedCallback,
-    ));
+      body: MapLibreMap(
+        onMapCreated: _onMapCreated,
+        initialCameraPosition: const CameraPosition(target: LatLng(0.0, 0.0)),
+        onStyleLoadedCallback: onStyleLoadedCallback,
+      ),
+    );
   }
 
   void onStyleLoadedCallback() {}

maplibre_gl_platform_interface/lib/src/maplibre_gl_platform_interface.dart

@@ -202,6 +202,18 @@ abstract class MapLibrePlatform {
 
   Future<void> setLayerVisibility(String layerId, bool visible);
 
+  /// Method to set style string
+  /// A MapLibre GL style document defining the map's appearance.
+  /// The style document specification is at [https://maplibre.org/maplibre-style-spec].
+  /// A short introduction can be found in the documentation of the [maplibre_gl] library.
+  /// The [styleString] supports following formats:
+  ///
+  /// 1. Passing the URL of the map style. This should be a custom map style served remotely using a URL that start with 'http(s)://'
+  /// 2. Passing the style as a local asset. Create a JSON file in the `assets` and add a reference in `pubspec.yml`. Set the style string to the relative path for this asset in order to load it into the map.
+  /// 3. Passing the style as a local file. create an JSON file in app directory (e.g. ApplicationDocumentsDirectory). Set the style string to the absolute path of this JSON file.
+  /// 4. Passing the raw JSON of the map style. This is only supported on Android.
+  Future<void> setStyle(String styleString);
+
   @mustCallSuper
   void dispose() {
     // clear all callbacks to avoid cyclic refs

maplibre_gl_platform_interface/lib/src/method_channel_maplibre_gl.dart

@@ -831,4 +831,22 @@ class MapLibreMethodChannel extends MapLibrePlatform {
       return Future.error(e);
     }
   }
+
+  /// Method to set style string
+  ///
+  @override
+  Future<void> setStyle(String styleString) async {
+    try {
+      await _channel.invokeMethod(
+        'style#setStyle',
+        <String, dynamic>{
+          'style': styleString,
+        },
+      );
+    } on PlatformException catch (e) {
+      return Future.error(e);
+    } catch (e) {
+      return Future.error(e);
+    }
+  }
 }

maplibre_gl_web/lib/src/maplibre_web_gl_platform.dart

@@ -1150,4 +1150,11 @@ class MapLibreMapController extends MapLibrePlatform
   Future<List> getSourceIds() async {
     throw UnimplementedError();
   }
+
+  /// Method to set style string
+  /// [styleString] -> It will take json, url, absolute path or asset path
+  @override
+  Future<void> setStyle(String styleString) async {
+    _map.setStyle(styleString);
+  }
 }