Moved function getLabelsWidth

src/timeline/Timeline.js

@@ -436,7 +436,6 @@ Timeline.prototype.setItems = function(items) {
  */
 Timeline.prototype.setGroups = function(groupSet) {
   this.groupsData = groupSet;
-
   this.itemSet.setGroups(groupSet);
 };
 

src/timeline/component/ItemSet.js

@@ -19,6 +19,11 @@ function ItemSet(backgroundPanel, axisPanel, options) {
   this.axisPanel = axisPanel;
   this.itemOptions = Object.create(this.options);
   this.dom = {};
+  this.props = {
+    labels: {
+      width: 0
+    }
+  };
   this.hammer = null;
 
   var me = this;
@@ -698,6 +703,14 @@ ItemSet.prototype._constructByEndArray = function _constructByEndArray(array) {
   return endArray;
 };
 
+/**
+ * Get the width of the group labels
+ * @return {Number} width
+ */
+ItemSet.prototype.getLabelsWidth = function getLabelsWidth() {
+  return this.props.labels.width;
+};
+
 /**
  * Start dragging the selected events
  * @param {Event} event