Fire change events for multi-part geometries

src/ol/geom/abstractcollection.js

@@ -1,7 +1,9 @@
 goog.provide('ol.geom.AbstractCollection');
 
+goog.require('goog.events.EventType');
 goog.require('ol.extent');
 goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryEvent');
 
 
 
@@ -16,6 +18,7 @@ ol.geom.AbstractCollection = function() {
 
   /**
    * @type {Array.<ol.geom.Geometry>}
+   * @protected
    */
   this.components = null;
 
@@ -45,6 +48,14 @@ ol.geom.AbstractCollection.prototype.getBounds = function() {
 };
 
 
+/**
+ * @return {Array.<ol.geom.Geometry>} Components.
+ */
+ol.geom.AbstractCollection.prototype.getComponents = function() {
+  return this.components;
+};
+
+
 /**
  * @inheritDoc
  */
@@ -64,6 +75,26 @@ ol.geom.AbstractCollection.prototype.getCoordinates = function() {
 ol.geom.AbstractCollection.prototype.getType = goog.abstractMethod;
 
 
+/**
+ * Listener for ring change events.
+ * @param {ol.geom.GeometryEvent} evt Geometry event.
+ * @protected
+ */
+ol.geom.AbstractCollection.prototype.handleComponentChange = function(evt) {
+  this.bounds = null;
+  var oldExtent = ol.extent.createEmpty();
+  var components = this.components;
+  for (var i = components.length - 1; i >= 0; --i) {
+    var component = components[i];
+    ol.extent.extend(oldExtent,
+        component === evt.target && !goog.isNull(evt.oldExtent) ?
+            evt.oldExtent : component.getBounds());
+  }
+  this.dispatchEvent(new ol.geom.GeometryEvent(goog.events.EventType.CHANGE,
+      this, oldExtent));
+};
+
+
 /**
  * @inheritDoc
  */

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
  */

src/ol/geom/multilinestring.js

@@ -1,6 +1,8 @@
 goog.provide('ol.geom.MultiLineString');
 
 goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
 goog.require('ol.CoordinateArray');
 goog.require('ol.geom.AbstractCollection');
 goog.require('ol.geom.GeometryType');
@@ -21,10 +23,14 @@ ol.geom.MultiLineString = function(coordinates) {
 
   /**
    * @type {Array.<ol.geom.LineString>}
+   * @protected
    */
   this.components = new Array(numParts);
   for (var i = 0; i < numParts; ++i) {
-    this.components[i] = new ol.geom.LineString(coordinates[i]);
+    var component = new ol.geom.LineString(coordinates[i]);
+    this.components[i] = component;
+    goog.events.listen(component, goog.events.EventType.CHANGE,
+        this.handleComponentChange, false, this);
   }
 
 };

src/ol/geom/multipoint.js

@@ -1,6 +1,8 @@
 goog.provide('ol.geom.MultiPoint');
 
 goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
 goog.require('ol.CoordinateArray');
 goog.require('ol.geom.AbstractCollection');
 goog.require('ol.geom.GeometryType');
@@ -21,10 +23,14 @@ ol.geom.MultiPoint = function(coordinates) {
 
   /**
    * @type {Array.<ol.geom.Point>}
+   * @protected
    */
   this.components = new Array(numParts);
   for (var i = 0; i < numParts; ++i) {
-    this.components[i] = new ol.geom.Point(coordinates[i]);
+    var component = new ol.geom.Point(coordinates[i]);
+    this.components[i] = component;
+    goog.events.listen(component, goog.events.EventType.CHANGE,
+        this.handleComponentChange, false, this);
   }
 
 };

src/ol/geom/multipolygon.js

@@ -1,6 +1,8 @@
 goog.provide('ol.geom.MultiPolygon');
 
 goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
 goog.require('ol.CoordinateArray');
 goog.require('ol.geom.AbstractCollection');
 goog.require('ol.geom.GeometryType');
@@ -22,10 +24,14 @@ ol.geom.MultiPolygon = function(coordinates) {
 
   /**
    * @type {Array.<ol.geom.Polygon>}
+   * @protected
    */
   this.components = new Array(numParts);
   for (var i = 0; i < numParts; ++i) {
-    this.components[i] = new ol.geom.Polygon(coordinates[i]);
+    var component = new ol.geom.Polygon(coordinates[i]);
+    this.components[i] = component;
+    goog.events.listen(component, goog.events.EventType.CHANGE,
+        this.handleComponentChange, false, this);
   }
 
 };