Fire change events for multi-part geometries

src/ol/geom/geometrycollection.js

@@ -1,6 +1,8 @@
 goog.provide('ol.geom.GeometryCollection');
 
 goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
 goog.require('ol.geom.AbstractCollection');
 goog.require('ol.geom.Geometry');
 goog.require('ol.geom.GeometryType');
@@ -18,8 +20,14 @@ goog.require('ol.geom.GeometryType');
 ol.geom.GeometryCollection = function(geometries) {
   goog.base(this);
 
+  for (var i = geometries.length - 1; i >= 0; --i) {
+    goog.events.listen(geometries[i], goog.events.EventType.CHANGE,
+        this.handleComponentChange, false, this);
+  }
+
   /**
    * @type {Array.<ol.geom.Geometry>}
+   * @protected
    */
   this.components = geometries;
 
@@ -27,6 +35,19 @@ ol.geom.GeometryCollection = function(geometries) {
 goog.inherits(ol.geom.GeometryCollection, ol.geom.AbstractCollection);
 
 
+/**
+ * @inheritDoc
+ */
+ol.geom.GeometryCollection.prototype.clone = function() {
+  var numComponents = this.components.length;
+  var components = new Array(numComponents);
+  for (var i = 0; i < numComponents; ++i) {
+    components[i] = this.components[i];
+  }
+  return new ol.geom.GeometryCollection(components);
+};
+
+
 /**
  * @inheritDoc
  */