Describe "visitorTrack" event in Events class

src/mibew/libs/classes/Mibew/Controller/WidgetController.php

@@ -20,6 +20,7 @@
 namespace Mibew\Controller;
 
 use Mibew\EventDispatcher\EventDispatcher;
+use Mibew\EventDispatcher\Events;
 use Mibew\Settings;
 use Mibew\Thread;
 use Symfony\Component\HttpFoundation\Request;
@@ -34,6 +35,8 @@ class WidgetController extends AbstractController
     /**
      * Provides a gateway for widget requests.
      *
+     * Triggers {@link \Mibew\EventDispatcher\Events::VISITOR_TRACK} event.
+     *
      * @param Request $request
      * @return string Rendered page content
      */
@@ -89,7 +92,7 @@ class WidgetController extends AbstractController
             // Provide an ability for others to make something on visitor
             // tracking
             $event_arguments = array('visitor' => $visitor);
-            EventDispatcher::getInstance()->triggerEvent('visitorTrack', $event_arguments);
+            EventDispatcher::getInstance()->triggerEvent(Events::VISITOR_TRACK, $event_arguments);
 
             // Get invitation state
             $invitation_state = invitation_state($visitor_id);

src/mibew/libs/classes/Mibew/EventDispatcher/Events.php

@@ -155,4 +155,16 @@ final class Events
      *    a response object to this field.
      */
     const RESOURCE_NOT_FOUND = 'resourceNotFound';
+
+    /**
+     * Visitor is tracked by the system.
+     *
+     * This event is triggered every time a visitor is tracked by the widget. An
+     * associative array with the following items is passed to the event
+     * handlers:
+     *   - "visitor": array, list of visitor's info. See returned value of
+     *     {@link track_get_visitor_by_id()} function for details of its
+     *     structure.
+     */
+    const VISITOR_TRACK = 'visitorTrack';
 }