Add method to bind bluring on mouseout/focusout

src/ol/control/control.js

@@ -3,6 +3,7 @@ goog.provide('ol.control.Control');
 goog.require('goog.array');
 goog.require('goog.dom');
 goog.require('goog.events');
+goog.require('goog.events.EventType');
 goog.require('ol.MapEventType');
 goog.require('ol.Object');
 
@@ -78,6 +79,24 @@ ol.control.Control = function(options) {
 goog.inherits(ol.control.Control, ol.Object);
 
 
+/**
+ * Bind a listener that blurs the passed element on any mouseout- or
+ * focusout-event.
+ *
+ * @param {!Element} button The button which shall blur on mouseout- or
+ *     focusout-event.
+ * @protected
+ */
+ol.control.Control.bindMouseOutFocusOutBlur = function(button) {
+  goog.events.listen(button, [
+    goog.events.EventType.MOUSEOUT,
+    goog.events.EventType.FOCUSOUT
+  ], /** @this {Element} */ function() {
+    this.blur();
+  }, false);
+};
+
+
 /**
  * @inheritDoc
  */