Add new timeout option to ol.interaction.MouseWheelZoom

And remove the `ol.MOUSEWHEELZOOM_TIMEOUT_DURATION` define.

externs/olx.js

@@ -2935,6 +2935,7 @@ olx.interaction.ModifyOptions.prototype.wrapX;
 
 /**
  * @typedef {{duration: (number|undefined),
+ *     timeout: (number|undefined),
  *     useAnchor: (boolean|undefined)}}
  */
 olx.interaction.MouseWheelZoomOptions;
@@ -2948,6 +2949,14 @@ olx.interaction.MouseWheelZoomOptions;
 olx.interaction.MouseWheelZoomOptions.prototype.duration;
 
 
+/**
+ * Mouse wheel timeout duration in milliseconds. Default is `80`.
+ * @type {number|undefined}
+ * @api
+ */
+olx.interaction.MouseWheelZoomOptions.prototype.timeout;
+
+
 /**
  * Enable zooming using the mouse's location as the anchor. Default is `true`.
  * When set to false, zooming in and out will zoom to the center of the screen

src/ol/index.js

@@ -142,12 +142,6 @@ ol.MAX_ATLAS_SIZE = -1;
 ol.MOUSEWHEELZOOM_MAXDELTA = 1;
 
 
-/**
- * @define {number} Mouse wheel timeout duration.
- */
-ol.MOUSEWHEELZOOM_TIMEOUT_DURATION = 80;
-
-
 /**
  * @define {number} Maximum width and/or height extent ratio that determines
  * when the overview map should be zoomed out.

src/ol/interaction/mousewheelzoom.js

@@ -36,6 +36,12 @@ ol.interaction.MouseWheelZoom = function(opt_options) {
    */
   this.duration_ = options.duration !== undefined ? options.duration : 250;
 
+  /**
+   * @private
+   * @type {number}
+   */
+  this.timeout_ = options.timeout !== undefined ? options.timeout : 80;
+
   /**
    * @private
    * @type {boolean}
@@ -109,8 +115,7 @@ ol.interaction.MouseWheelZoom.handleEvent = function(mapBrowserEvent) {
       this.startTime_ = Date.now();
     }
 
-    var duration = ol.MOUSEWHEELZOOM_TIMEOUT_DURATION;
-    var timeLeft = Math.max(duration - (Date.now() - this.startTime_), 0);
+    var timeLeft = Math.max(this.timeout_ - (Date.now() - this.startTime_), 0);
 
     clearTimeout(this.timeoutId_);
     this.timeoutId_ = setTimeout(

test/spec/ol/interaction/mousewheelzoom.test.js

@@ -27,6 +27,36 @@ describe('ol.interaction.MouseWheelZoom', function() {
     disposeMap(map);
   });
 
+  describe('timeout duration', function() {
+    var clock;
+    beforeEach(function() {
+      clock = sinon.useFakeTimers();
+    });
+
+    afterEach(function() {
+      clock.restore();
+    });
+
+    it('works with the defaut value', function(done) {
+      var spy = sinon.spy(ol.interaction.Interaction, 'zoomByDelta');
+      var event = new ol.MapBrowserEvent('mousewheel', map, {
+        type: 'mousewheel',
+        target: map.getViewport(),
+        preventDefault: ol.events.Event.prototype.preventDefault
+      });
+      map.handleMapBrowserEvent(event);
+      clock.tick(50);
+      // default timeout is 80 ms, not called yet
+      expect(spy.called).to.be(false);
+      clock.tick(30);
+      expect(spy.called).to.be(true);
+
+      ol.interaction.Interaction.zoomByDelta.restore();
+      done();
+    });
+
+  });
+
   describe('handleEvent()', function() {
     it('[wheel] works on Firefox in DOM_DELTA_PIXEL mode', function(done) {
       var origHasFirefox = ol.has.FIREFOX;