changed = function (
   event
Object that contains information about event. Object has the following properties:
 
 
target (object): An object that raised the event.
 
type (string): Event name.
 
data (object): An object that contains data, which were specified when subscribing to the event.
 
originalEvent (object): Original event if event was received from DOM-element.
 
 : object
   eventsArgs
Object that contains event arguments. Object has the following properties:
 
 
actionName (string): Action name. Supported values: "clear", "insert", "set", "move", "remove", "swap".
 
annotation (object): WebAnnotationViewJS object. Property is defined for actions "insert", "set", "move", "remove".
 
previousAnnotation (object): Previous WebAnnotationViewJS object. Property is defined for action "set".
 
index (number): Zero-based index of annotation for inserting/removing/setting of annotation. Property is defined only for actions "insert", "set" and "remove".
 
firstIndex (number): Zero-based index of the first annotation after swapping of annotations. Property is defined only for the action "swap".
 
secondIndex (number): Zero-based index of the second annotation after swapping of annotations. Property is defined only for the action "swap".
 
previousIndex (number): Zero-based index of annotation before moving of annotation. Property is defined only for the action "move".
 
currentIndex (number): Zero-based index of annotation after moving of annotation. Property is defined only for the action "move".
 
annotations (object): Array that contains all WebAnnotationViewJS objects from collection. Property is defined for action "clear".
 
 : object
) { };