PRB: Form Not Released from Menu Pad or ON KEY LABEL (156238)

MORE INFORMATION

The Keypress event of the form intercepts the keystroke, and the form cannot be released until the procedure or command called by the keystroke has completed.

Steps to Reproduce Behavior

1. Run the following code from a .prg:

      ON KEY LABEL F3 DO Release_It
      oForm = CREATEOBJECT('form')
      oForm.Caption = "Press F3 to release form, then F3 to Clear Events"
      oForm.SHOW()
      READ EVENTS
      ON KEY LABEL F3
   
      PROCEDURE Release_It
          oForm.RELEASE
          =MESSAGEBOX("Though form has been released, _SCREEN.Formcount = " ;
            + ALLTR(STR(_SCREEN.FORMCOUNT,1)) + ". Press F3 after OK to " ;
            + "return to Command Window." ,0)
          ON KEY LABEL F3 CLEAR EVENTS
      ENDPROC
   						

2. Press the F3 key. The message box indicates the form still exists since the FormCount property of the _SCREEN system variable still returns 1.
3. Click OK then press F3 to return to the Command window.

Modify the Release_It procedure in the above example as follows to demonstrate the workaround. (The form is still not immediately released from memory but setting the Visible property to .F. - False makes it appear released.)

   PROCEDURE Release_It
      oForm.Visible = .F.
      oForm.RELEASE
      =MESSAGEBOX("Though form has been released, _SCREEN.Formcount = " ;
        + ALLTR(STR(_SCREEN.FORMCOUNT,1)) + ". Press F3 after OK to " ;
        + "return to Command Window." ,0)
      ON KEY LABEL F3 CLEAR EVENTS
   ENDPROC