Merge pull request #12414 from ahocevar/change-event-type

Replace getChangeEventType() with add/removeChangeListener methods

src/ol/Object.js

@@ -149,12 +149,28 @@ class BaseObject extends Observable {
    */
   notify(key, oldValue) {
     let eventType;
-    eventType = getChangeEventType(key);
+    eventType = `change:${key}`;
     this.dispatchEvent(new ObjectEvent(eventType, key, oldValue));
     eventType = ObjectEventType.PROPERTYCHANGE;
     this.dispatchEvent(new ObjectEvent(eventType, key, oldValue));
   }
 
+  /**
+   * @param {string} key Key name.
+   * @param {import("./events.js").Listener} listener Listener.
+   */
+  addChangeListener(key, listener) {
+    this.addEventListener(`change:${key}`, listener);
+  }
+
+  /**
+   * @param {string} key Key name.
+   * @param {import("./events.js").Listener} listener Listener.
+   */
+  removeChangeListener(key, listener) {
+    this.removeEventListener(`change:${key}`, listener);
+  }
+
   /**
    * Sets a value.
    * @param {string} key Key name.
@@ -220,19 +236,4 @@ class BaseObject extends Observable {
   }
 }
 
-/**
- * @type {Object<string, string>}
- */
-const changeEventTypeCache = {};
-
-/**
- * @param {string} key Key name.
- * @return {string} Change name.
- */
-export function getChangeEventType(key) {
-  return changeEventTypeCache.hasOwnProperty(key)
-    ? changeEventTypeCache[key]
-    : (changeEventTypeCache[key] = 'change:' + key);
-}
-
 export default BaseObject;