Configure ol.interaction.DblClickZoom with options

src/objectliterals.jsdoc

@@ -164,6 +164,12 @@
  * @property {number|undefined} minResolution Minimum resolution.
  */
 
+/**
+ * @typedef {Object} ol.interaction.DblClickZoomOptions
+ * @property {number|undefined} delta The zoom delta applied on each double
+ *    click.
+ */
+
 /**
  * Interactions for the map. Default is true for all options.
  * @typedef {Object} ol.interaction.DefaultsOptions
@@ -182,6 +188,7 @@
  *     desired.
  * @property {boolean|undefined} touchRotate Whether touch rotate is desired.
  * @property {boolean|undefined} touchZoom Whether touch zoom is desired.
+ * @property {number|undefined} zoomDelta Zoom delta.
  */
 
 /**

src/ol/interaction/dblclickzoominteraction.js

@@ -18,16 +18,20 @@ ol.interaction.DBLCLICKZOOM_ANIMATION_DURATION = 250;
 /**
  * @constructor
  * @extends {ol.interaction.Interaction}
- * @param {number} delta The zoom delta applied on each double click.
+ * @param {ol.interaction.DblClickZoomOptions=} opt_options Options.
  */
-ol.interaction.DblClickZoom = function(delta) {
+ol.interaction.DblClickZoom = function(opt_options) {
+
+  var options = goog.isDef(opt_options) ? opt_options : {};
+
   /**
    * @private
    * @type {number}
    */
-  this.delta_ = delta;
+  this.delta_ = goog.isDef(options.delta) ? options.delta : 1;
 
   goog.base(this);
+
 };
 goog.inherits(ol.interaction.DblClickZoom, ol.interaction.Interaction);
 

src/ol/interaction/interactiondefaults.js

@@ -38,9 +38,9 @@ ol.interaction.defaults = function(opt_options, opt_interactions) {
   var doubleClickZoom = goog.isDef(options.doubleClickZoom) ?
       options.doubleClickZoom : true;
   if (doubleClickZoom) {
-    var zoomDelta = goog.isDef(options.zoomDelta) ?
-        options.zoomDelta : 1;
-    interactions.push(new ol.interaction.DblClickZoom(zoomDelta));
+    interactions.push(new ol.interaction.DblClickZoom({
+      delta: options.zoomDelta
+    }));
   }
 
   var touchPan = goog.isDef(options.touchPan) ?