getBound in "Synchromized Mode" without wait Event from Client

added "MapIdle" Listener

src/main/java/com/flowingcode/vaadin/addons/googlemaps/GoogleMap.java

@@ -76,6 +76,10 @@ public GoogleMap(String apiKey, String clientId, String language) {
     if (!StringUtils.isEmpty(language)) {
       this.getElement().setAttribute("language", language);
     }
+    getElement().addEventListener("google-map-ready", event -> {
+	  getElement().executeJs(
+        "$0.map.addListener(\"bounds_changed\", (event) => {$0.bounds =$0.map.getBounds();});", this);
+	});  
   }
 
   @Synchronize("google-map-idle")
@@ -542,6 +546,11 @@ public CompletableFuture<LatLonBounds> getBounds() {
         });
   }
 
+  @Synchronize("google-map-idle")
+  public LatLonBounds getBoundsSync() {
+	return new LatLonBounds((JsonObject) this.getElement().getPropertyRaw("bounds"));
+  }
+
   /**
    * Sets the custom renderer definition to be applied to the markers clustering. The custom
    * renderer needs to be define as a global JavaScript object conforming the Renderer interface
@@ -553,4 +562,18 @@ public CompletableFuture<LatLonBounds> getBounds() {
   public void setClusteringRenderer(String customRenderer) {
     this.getElement().setProperty("customRenderer", customRenderer);
   }
+
+  public Registration addMapIdleListener(ComponentEventListener<GoogleMapIdleEvent> listener) {
+	DomListenerRegistration registration = this.getElement().addEventListener("google-map-idle", ev -> {
+		listener.onComponentEvent(new GoogleMapIdleEvent(this, true));
+	});
+	return registration::remove;
+  }
+
+  public static class GoogleMapIdleEvent extends ComponentEvent<GoogleMap> {
+	public GoogleMapIdleEvent(GoogleMap source, boolean fromClient) {
+      super(source, true);
+    }
+  }
+
 }