unregister_unregister_event_handler_.htm
| Navigation: Language Reference > 13 - Built-in Functions >====== UNREGISTER (unregister event handler) ====== |    |
UNREGISTER( [event ] [, handler ] [, object ] [,window] [,control] )
| UNREGISTER | Unregisters an event handling procedure. |
| event | An integer constant, variable, expression, or EQUATE containing an event number. A value in the range 400h to 0FFFh is a User-defined event. If omitted, all events are unregistered. |
| handler | A LONG variable, or expression containing the return value from ADDRESS for the PROCEDURE to handle the event. If omitted, all handlers are unregistered. |
| object | A LONG integer constant, variable, or expression containing any 32-bit unique value to identify the specific handler. This is generally the return value of ADDRESS(SELF) when the handler is a CLASS method. |
| window | The label of the WINDOW or REPORT whose event to handle. If omitted, the current target WINDOW or REPORT is assumed. |
| control | An integer constant, EQUATE, variable, or expression containing the field number of the specific control whose event to handle. If omitted, the event is handled for every control on the window. |
UNREGISTER prevents a previously REGISTERed event handler PROCEDURE from being called to handle its event.
Can also be prototyped as UNREGISTEREVENT.
Example:
WindowResizeClass.Kill PROCEDURE
CODE
UNREGISTER(EVENT:Sized,ADDRESS(SELF.TakeResize),ADDRESS(SELF))
!Other code follows
WindowResizeClass.TakeResize PROCEDURE
ReturnValue BYTE
CODE
ReturnValue = Level:Benign
RETURN(ReturnValue)
See Also:
unregister_unregister_event_handler_.htm.txt · Last modified: 2021/04/15 15:57 by 127.0.0.1