ABL supports events with several different constructs. Classes support widget and low-level ABL events using the
ON statement, and they support ProDataSet, query, and buffer object callbacks using the
SET-CALLBACK( ) method. Classes also allow you to publish named events associated with external procedures using the
PUBLISH statement’s
FROM publisher-handle option and they allow you to manage subscriptions of internal procedures as event handlers for named events using the
SUBSCRIBE and
UNSUBSCRIBE statements’
PROCEDURE subscriber-handle option. However, you cannot subscribe class methods to named events as event handlers or otherwise provide behavior to a class using named events. Classes support class events as members that provide a similar form of event behavior for a class. For more information, see
Definingevents within a class.
