Select layers for box selection

Author: stfnkth

src/openlayers/js/openlayers.anywidget.js

@@ -258,8 +258,8 @@ export default class MapWidget {
     addSelectFeaturesToMap(this._map, this._model);
   }
 
-  addBoxSelection(): void {
-    addBoxSelectionToMap(this._map, this._model);
+  addBoxSelection(layerIds?: string[]): void {
+    addBoxSelectionToMap(this._map, layerIds, this._model);
   }
 
   addClickInteraction(): void {

srcjs/ipywidget-ts/map.ts

@@ -73,19 +73,24 @@ function addSelectFeaturesToMap(map: Map, model?: AnyModel): void {
     });
 }
 
-function addBoxSelectionToMap(map: Map, model?: AnyModel): void {
+function addBoxSelectionToMap(map: Map, layerIds?: string[], model?: AnyModel): void {
     console.warn("Box selection is still experimental.");
 
-    let selected = [] as Feature[];
+    let layers = map.getLayers().getArray();
+    if (layerIds) {
+        layers = layers.filter(layer => layerIds.includes(layer.get("id")));
+    }
 
+    let selected = [] as Feature[];
     const dragBox = new DragBox({
         condition: platformModifierKeyOnly,
     });
+
     map.addInteraction(dragBox);
     dragBox.on('boxend', function () {
         const extent = dragBox.getGeometry().transform('EPSG:3857', 'EPSG:4326').getExtent();
         console.log("box extent", extent);
-        for (let layer of map.getLayers().getArray()) {
+        for (let layer of layers) {
             if (!(layer instanceof VectorLayer) && !(layer instanceof WebGLVectorLayer)) {
                 console.log("skip layer", layer.get("id"));
                 continue;