As described previously (see
Events of aclass), class events allow you to dynamically register one or more event handlers that execute in response to run-time conditions. Thus, you publish the event to notify other parts of the application when a given condition is detected, and one or more event handlers execute in response to this notification. Depending on run-time conditions, you can change the number of event handlers that execute for any given event. In this way, different parts of the application can respond to the same event at different times whenever the event is published. For example, one common use of this mechanism is to help populate one or more data viewers from record buffers whose contents have been updated from a selection in a data browser.
The procedure for using a class event to provide such notifications follows a common pattern.
3. Publish the event from within the class that defines it for a given condition using the
Publish( ) event method, which runs all event handlers that are subscribed to the event, and processes any values returned from the
Publish( ) method parameters (see
Publishingclass events).
Note: This section describes event subscription and publishing mechanisms that apply in common to both instance events and static events, but to instance events in particular. For information on the unique features of working with static events, see
Accessingstatic members.