From: Marwin Hochfelsner <50826859+hlfan@users.noreply.github.com>
Date: Thu, 16 Jan 2025 20:16:14 +0000 (+0100)
Subject: Allow map layers to specify an alternate tile set for dark mode
X-Git-Tag: live~299^2~2
X-Git-Url: https://git.openstreetmap.org./rails.git/commitdiff_plain/01d8dba8ce5037cadfdee18b865b3a6821e80854

Allow map layers to specify an alternate tile set for dark mode
---

diff --git a/app/assets/javascripts/leaflet.map.js b/app/assets/javascripts/leaflet.map.js
index e0c2ee60b..7929ea0ac 100644
--- a/app/assets/javascripts/leaflet.map.js
+++ b/app/assets/javascripts/leaflet.map.js
@@ -32,6 +32,8 @@ L.OSM.Map = L.Map.extend({
           layerOptions.apikey = OSM[value];
         } else if (property === "leafletOsmId") {
           layerConstructor = L.OSM[value];
+        } else if (property === "leafletOsmDarkId" && OSM.isDarkMap() && L.OSM[value]) {
+          layerConstructor = L.OSM[value];
         } else {
           layerOptions[property] = value;
         }
@@ -386,6 +388,14 @@ L.extend(L.Icon.Default.prototype, {
   }
 });
 
+OSM.isDarkMap = function () {
+  var mapTheme = $("body").attr("data-map-theme");
+  if (mapTheme) return mapTheme === "dark";
+  var siteTheme = $("html").attr("data-bs-theme");
+  if (siteTheme) return siteTheme === "dark";
+  return window.matchMedia("(prefers-color-scheme: dark)").matches;
+};
+
 OSM.getUserIcon = function (url) {
   return L.icon({
     iconUrl: url || OSM.MARKER_RED,