Base class for all data objects passed to event listeners
The event package contains the event.EventData class, which defines the data objects passed to event listeners. If you want to provide additional information to event listeners, you can do so by subclassing event.EventData. See Defining Event-Specific Data for more information.
The event.EventData class defines two properties and no methods:
EventName — The name of the event described by this data object.
Source — The source object whose class defines the event described by the data object.