High level Modify interaction events

src/ol/interaction/modifyinteraction.js

@@ -3,6 +3,7 @@ goog.provide('ol.interaction.Modify');
 goog.require('goog.array');
 goog.require('goog.asserts');
 goog.require('goog.events');
+goog.require('goog.events.Event');
 goog.require('goog.functions');
 goog.require('ol.Collection');
 goog.require('ol.CollectionEventType');
@@ -26,6 +27,52 @@ goog.require('ol.structs.RBush');
 goog.require('ol.style.Style');
 
 
+/**
+ * @enum {string}
+ */
+ol.ModifyEventType = {
+  /**
+   * Triggered upon feature modification start
+   * @event ol.ModifyEvent#modifystart
+   * @api stable
+   */
+  MODIFYSTART: 'modifystart',
+  /**
+   * Triggered upon feature modification end
+   * @event ol.ModifyEvent#modifyend
+   * @api stable
+   */
+  MODIFYEND: 'modifyend'
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.interaction.Modify} instances are instances of
+ * this type.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.ModifyEvent}
+ * @param {ol.ModifyEventType} type Type.
+ * @param {ol.Collection.<ol.Feature>} features The features modified.
+ */
+ol.ModifyEvent = function(type, features) {
+
+  goog.base(this, type);
+
+  /**
+   * The feature being modified.
+   * @type {ol.Collection.<ol.Feature>}
+   * @api stable
+   */
+  this.features = features;
+
+};
+goog.inherits(ol.ModifyEvent, goog.events.Event);
+
+
 /**
  * @typedef {{depth: (Array.<number>|undefined),
  *            feature: ol.Feature,
@@ -44,6 +91,7 @@ ol.interaction.SegmentDataType;
  * @constructor
  * @extends {ol.interaction.Pointer}
  * @param {olx.interaction.ModifyOptions} options Options.
+ * @fires ol.ModifyEvent
  * @api stable
  */
 ol.interaction.Modify = function(options) {
@@ -466,6 +514,8 @@ ol.interaction.Modify.handleDownEvent_ = function(evt) {
     for (i = insertVertices.length - 1; i >= 0; --i) {
       this.insertVertex_.apply(this, insertVertices[i]);
     }
+    this.dispatchEvent(new ol.ModifyEvent(ol.ModifyEventType.MODIFYSTART,
+        this.features_));
   }
   return !goog.isNull(this.vertexFeature_);
 };
@@ -537,6 +587,8 @@ ol.interaction.Modify.handleUpEvent_ = function(evt) {
     this.rBush_.update(ol.extent.boundingExtent(segmentData.segment),
         segmentData);
   }
+  this.dispatchEvent(new ol.ModifyEvent(ol.ModifyEventType.MODIFYEND,
+      this.features_));
   return false;
 };