From d188525c7416567cf279ca8ef028c575643acc6f Mon Sep 17 00:00:00 2001
From: Yohan Boniface <yohanboniface@free.fr>
Date: Thu, 10 Aug 2023 08:16:03 +0200
Subject: [PATCH] Compute _layers for MarkerCluster, so to easily know if layer
 has data

---
 umap/static/umap/js/umap.layer.js | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/umap/static/umap/js/umap.layer.js b/umap/static/umap/js/umap.layer.js
index f6aecced..06035165 100644
--- a/umap/static/umap/js/umap.layer.js
+++ b/umap/static/umap/js/umap.layer.js
@@ -10,6 +10,10 @@ L.U.Layer = {
   },
 
   postUpdate: function () {},
+
+  hasDataVisible: function () {
+    return !!Object.keys(this._layers).length
+  },
 }
 
 L.U.Layer.Default = L.FeatureGroup.extend({
@@ -53,6 +57,17 @@ L.U.Layer.Cluster = L.MarkerClusterGroup.extend({
     }
     L.MarkerClusterGroup.prototype.initialize.call(this, options)
     this._markerCluster = L.U.MarkerCluster
+    this._layers = []
+  },
+
+  addLayer: function (layer) {
+    this._layers.push(layer)
+    return L.MarkerClusterGroup.prototype.addLayer.call(this, layer)
+  },
+
+  removeLayer: function (layer) {
+    this._layers.splice(this._layers.indexOf(layer), 1)
+    return L.MarkerClusterGroup.prototype.removeLayer.call(this, layer)
   },
 
   getEditableOptions: function () {
@@ -286,7 +301,7 @@ L.U.DataLayer = L.Evented.extend({
   },
 
   hasDataVisible: function () {
-    return !!Object.keys(this.layer._layers).length
+    return this.layer.hasDataVisible()
   },
 
   resetLayer: function (force) {