Window.QueryClose Method |  |
Provide a method that is invoked just before the window closes to confirm if the application really wants to close the window.
Namespace: VO
Assembly: VOGUIClasses (in VOGUIClasses.dll) Version: 2.19
SyntaxRequest Example
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The method inside the window class always returns TRUE. If you override this method in your subclass then you must return TRUE if the window is to be closed; otherwise, return FALSE.
Parameters
- oEvent (Optional)
- Type: Usual
An empty event required to maintain the protocol that all event handlers have exactly one event as their argument.
Return Value
Type: UsualThe method inside the window class always returns TRUE. If you override this method in your subclass then you must return TRUE if the window is to be closed; otherwise, return FALSE.
Remarks Tip |
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| Important! This is a callback method used by X#. Normally, it should not be called in your application code. |
| Tip |
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| If you reimplement this method in your subclass, it is recommended that you first call SUPER:QueryClose() within the method to obtain its default behavior. |
Examples
This example displays a message box to confirm that a user wants to quit the application. If a user chooses YES, TRUE is returned (otherwise, FALSE is returned).
X#
1METHOD QueryClose(oEvent) CLASS TopAppWindow 2oTB := TextBox{SELF, "Quit", "Do you really want to quit?"} 3oTB:TYPE := BOXICONQUESTIONMARK + BUTTONYESNO 4IF (oTB:Show() = BOXREPLYYES) 5RETURN TRUE // Quit application. 6ELSE 7RETURN FALSE 8// Don't quit the application. 9END
See Also