Kbase 19847: 4GL. How to Disable CTRL-C on GUI Applications (Break Event)
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
24/09/2008 |
|
Status: Verified
GOAL:
How to disable the key combination CTRL-C in applications (Break-Event)
GOAL:
Program is a persistent procedure
GOAL:
CTRL-C Event
FIX:
Every Simple or Smart Window has an END-ERROR or ENDKEY trigger, consisting of the following code:
ON END-ERROR OR ENDKEY OF {&WINDOW-NAME} ANYWHERE DO:
/* This case occurs when the user presses the "Esc" key.
In a persistently run window, just ignore this. If we did not, the application would exit. */
IF THIS-PROCEDURE:PERSISTENT THEN RETURN NO-APPLY.
END.
This code applies just for persistent procedures, and the CTRL-BREAK is not disabled here.
In order to to disable CTRL-C in a GUI application even if it is not persitent, modify the trigger as follows:
ON END-ERROR OR ENDKEY, CTRL-C OF {&WINDOW-NAME} ANYWHERE DO:
/* This case occurs when the user presses the "Esc","CTRL-C" Key.
Return no-apply will disable the keys mentioned above.*/
RETURN NO-APPLY.
END.
As you can see now there is no condition verifying if the procedure is persistent or not, and the trigger list has another entry (CTRL-C).
The main window of the application won't be closed until a normal exit is done.
The CTRL-BREAK event is an OS-LEVEL event and cannot be controlled directly within Progress.