implemented useMarkersOnMap

src/routePlanner/hooks/useMarkersOnMap/getLayersForMarkers.ts

@@ -1,5 +1,5 @@
 import leaflet from 'leaflet';
-import { Marker } from './types';
+import { Marker } from '../../types';
 
 export const getLayersForMarkers = (markers: Marker[]) => [
     // lines

src/routePlanner/hooks/useMarkersOnMap/index.ts

@@ -0,0 +1,29 @@
+import leaflet from 'leaflet';
+import { Ref, useEffect } from 'preact/hooks';
+import { getLayersForMarkers } from './getLayersForMarkers';
+import { Marker } from '../../types';
+
+export const useMarkersOnMap = (
+    mapRef: Readonly<Ref<leaflet.Map | undefined>>,
+    markers: Marker[],
+) => {
+    useEffect(() => {
+        const map = mapRef.current;
+        if (!map) {
+            return;
+        }
+
+        const layers = getLayersForMarkers(markers);
+
+        for (const layer of layers) {
+            layer.addTo(map);
+        }
+
+        return () => {
+            for (const layer of layers) {
+                layer.removeFrom(map);
+                layer.remove();
+            }
+        };
+    }, [mapRef, markers]);
+};

src/routePlanner/map.tsx

@@ -1,9 +1,9 @@
-import { useEffect, useRef } from 'preact/hooks';
+import { useRef } from 'preact/hooks';
 import { MapProps } from './types';
 
 import { useMap } from './hooks/useMap';
 import { useMapClick } from './hooks/useMapClick';
-import { getLayersForMarkers } from './getLayersForMarkers';
+import { useMarkersOnMap } from './hooks/useMarkersOnMap';
 
 const defaultMapViewParameters = [
     [47.42111, 10.98528],
@@ -14,26 +14,7 @@ export const MapComponent = ({ markers, onMapClick }: MapProps) => {
     const mapContainerRef = useRef<HTMLDivElement>(null);
     const mapRef = useMap(mapContainerRef, defaultMapViewParameters);
     useMapClick(mapRef, onMapClick);
-
-    useEffect(() => {
-        const map = mapRef.current;
-        if (!map) {
-            return;
-        }
-
-        const layers = getLayersForMarkers(markers);
-
-        for (const layer of layers) {
-            layer.addTo(map);
-        }
-
-        return () => {
-            for (const layer of layers) {
-                layer.removeFrom(map);
-                layer.remove();
-            }
-        };
-    }, [mapRef, markers]);
+    useMarkersOnMap(mapRef, markers);
 
     return <div ref={mapContainerRef} class="map-container" />;
 };