Knowledge Base

PRB: Hiding a Modal Form Removes Its Modal Attribute

Article ID: 132680

Article Last Modified on 2/15/2000

APPLIES TO

This article was previously published under Q132680

SYMPTOMS

When a modal form is displayed and then hidden, it looses its modal attribute. That is, when the form is shown, the user can access other windows if the form was hidden by clicking Hide on the Window menu or by using the HIDE WINDOW command.

RESOLUTION

You can prevent users from hiding the form from the interface by removing the Hide option from the Window menu with this command: 
   RELEASE BAR _Mwi_Hide OF _Mwindow
If you are hiding the form under program control, use the Hide and Show methods of the form instead of the HIDE WINDOW and SHOW WINDOW commands. Using these methods maintains the modality of the form.

STATUS

This behavior is by design. It avoids the problem of not being able to access anything when the modal form is hidden.

MORE INFORMATION

Steps to Reproduce Behavior

Run the following example code to duplicate the issue. It also presents an alternative. To run this sample code, copy and paste it to a program file; then run it. 
    PUBLIC oMyform
   oMyform=CREATEOBJECT('frmForm')
   oMyform.CAPTION="Click the Hide command button"
   oMyform.SHOW()

   =MESSAGEBOX("Click OK to Show the Form")
   * Uncomment the code below and comment the SHOW WINDOW line to
   * show the form as modal
   *oMyform.show()

   SHOW WINDOW (WOUTPUT())
   ?"Form is not modal"


   DEFINE CLASS frmForm AS FORM
      WINDOWTYPE=1  && Define a modal form
      ADD OBJECT cmd1 AS cmdHide
   ENDDEFINE


   DEFINE CLASS cmdHide AS COMMANDBUTTON
      CAPTION="Hide"

      PROCEDURE CLICK
         * To resolve the issue:
         * Uncomment the code below and comment the HIDE WINDOW line
         * ThisForm.Hide
         HIDE WINDOW (WONTOP())
   ENDDEFINE

Additional query words: VFoxWin

Keywords: KB132680


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