feat: AreaDropdown separate from MapLayerControlPanel

components/uiWidgets/AreaDropdown.js

@@ -0,0 +1,79 @@
+// /components/uiWidgets/AreaDropdown.js
+import React, { useEffect, useMemo } from "react";
+import { useDispatch, useSelector } from "react-redux";
+import { setSelectedArea } from "@/redux/slices/selectedAreaSlice";
+import { selectGisStationsStaticDistrict } from "@/redux/slices/webservice/gisStationsStaticDistrictSlice";
+import { selectGisSystemStatic } from "@/redux/slices/webservice/gisSystemStaticSlice";
+
+/**
+ * Kleines Dropdown zur Auswahl der Station (Area_Name),
+ * nutzt dieselbe Datenquelle wie das MapLayersControlPanel.
+ */
+const AreaDropdown = ({ onClose }) => {
+  const dispatch = useDispatch();
+  const GisStationsStaticDistrict = useSelector(selectGisStationsStaticDistrict) || {};
+  const GisSystemStatic = useSelector(selectGisSystemStatic) || [];
+
+  // Erlaubte Systeme: Allow === 1 und Map === 1
+  const allowedSystems = useMemo(() => {
+    return new Set(
+      (Array.isArray(GisSystemStatic) ? GisSystemStatic : [])
+        .filter(sys => sys.Allow === 1 && sys.Map === 1)
+        .map(sys => sys.IdSystem)
+    );
+  }, [GisSystemStatic]);
+
+  // Uniqe Areas basierend auf Allowed Systems
+  const areaOptions = useMemo(() => {
+    const points = GisStationsStaticDistrict?.Points || [];
+    const seen = new Set();
+    const filtered = points.filter(p => {
+      if (!p?.Area_Name) return false;
+      if (!allowedSystems.has(p.System)) return false;
+      if (seen.has(p.Area_Name)) return false;
+      seen.add(p.Area_Name);
+      return true;
+    });
+    return filtered.map(p => ({ label: p.Area_Name, value: p.IdLD }));
+  }, [GisStationsStaticDistrict, allowedSystems]);
+
+  const handleChange = e => {
+    const selectedIndex = e.target.options.selectedIndex;
+    const label = e.target.options[selectedIndex].text;
+    dispatch(setSelectedArea(label));
+    onClose?.();
+  };
+
+  // Schließe mit ESC
+  useEffect(() => {
+    const onKey = e => {
+      if (e.key === "Escape") onClose?.();
+    };
+    window.addEventListener("keydown", onKey);
+    return () => window.removeEventListener("keydown", onKey);
+  }, [onClose]);
+
+  return (
+    <div className="absolute top-16 right-3 z-[60]">
+      <div className="bg-white rounded-md shadow-lg p-3 border border-gray-200 min-w-[220px]">
+        <div className="text-sm font-semibold mb-2">Station wählen</div>
+        <select
+          onChange={handleChange}
+          className="border p-2 rounded w-full"
+          defaultValue="__default__"
+        >
+          <option value="__default__" disabled>
+            Bitte wählen…
+          </option>
+          {areaOptions.map(opt => (
+            <option key={opt.value} value={opt.value}>
+              {opt.label}
+            </option>
+          ))}
+        </select>
+      </div>
+    </div>
+  );
+};
+
+export default AreaDropdown;