Merge pull request #4161 from jonataswalker/translate-events

Add `translatestart`, `translateend` and `translating` events to `ol.interaction.Translate`

src/ol/interaction/translateinteraction.js

@@ -1,9 +1,72 @@
 goog.provide('ol.interaction.Translate');
+goog.provide('ol.interaction.TranslateEvent');
 
+goog.require('goog.events');
+goog.require('goog.events.Event');
 goog.require('ol.array');
 goog.require('ol.interaction.Pointer');
 
 
+/**
+ * @enum {string}
+ */
+ol.interaction.TranslateEventType = {
+  /**
+   * Triggered upon feature translation start.
+   * @event ol.interaction.TranslateEvent#translatestart
+   * @api
+   */
+  TRANSLATESTART: 'translatestart',
+  /**
+   * Triggered upon feature translation.
+   * @event ol.interaction.TranslateEvent#translating
+   * @api
+   */
+  TRANSLATING: 'translating',
+  /**
+   * Triggered upon feature translation end.
+   * @event ol.interaction.TranslateEvent#translateend
+   * @api
+   */
+  TRANSLATEEND: 'translateend'
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.interaction.Translate} instances are instances of
+ * this type.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.interaction.TranslateEvent}
+ * @param {ol.interaction.TranslateEventType} type Type.
+ * @param {ol.Collection.<ol.Feature>} features The features translated.
+ * @param {ol.Coordinate} coordinate The event coordinate.
+ */
+ol.interaction.TranslateEvent = function(type, features, coordinate) {
+
+  goog.base(this, type);
+
+  /**
+   * The features being translated.
+   * @type {ol.Collection.<ol.Feature>}
+   * @api
+   */
+  this.features = features;
+
+  /**
+   * The coordinate of the drag event.
+   * @const
+   * @type {ol.Coordinate}
+   * @api
+   */
+  this.coordinate = coordinate;
+};
+goog.inherits(ol.interaction.TranslateEvent, goog.events.Event);
+
+
 
 /**
  * @classdesc
@@ -11,6 +74,7 @@ goog.require('ol.interaction.Pointer');
  *
  * @constructor
  * @extends {ol.interaction.Pointer}
+ * @fires ol.interaction.TranslateEvent
  * @param {olx.interaction.TranslateOptions} options Options.
  * @api
  */
@@ -64,6 +128,10 @@ ol.interaction.Translate.handleDownEvent_ = function(event) {
   if (!this.lastCoordinate_ && this.lastFeature_) {
     this.lastCoordinate_ = event.coordinate;
     ol.interaction.Translate.handleMoveEvent_.call(this, event);
+    this.dispatchEvent(
+        new ol.interaction.TranslateEvent(
+            ol.interaction.TranslateEventType.TRANSLATESTART, this.features_,
+            event.coordinate));
     return true;
   }
   return false;
@@ -80,6 +148,10 @@ ol.interaction.Translate.handleUpEvent_ = function(event) {
   if (this.lastCoordinate_) {
     this.lastCoordinate_ = null;
     ol.interaction.Translate.handleMoveEvent_.call(this, event);
+    this.dispatchEvent(
+        new ol.interaction.TranslateEvent(
+            ol.interaction.TranslateEventType.TRANSLATEEND, this.features_,
+            event.coordinate));
     return true;
   }
   return false;
@@ -110,6 +182,10 @@ ol.interaction.Translate.handleDragEvent_ = function(event) {
     }
 
     this.lastCoordinate_ = newCoordinate;
+    this.dispatchEvent(
+        new ol.interaction.TranslateEvent(
+            ol.interaction.TranslateEventType.TRANSLATING, this.features_,
+            newCoordinate));
   }
 };