PRB: Closing Top-Level Form with Docked Toolbar Leaves Image

• Microsoft Visual FoxPro for Windows, versions 5.0, 5.0a, 6.0

SYMPTOMS

A phantom image of a form is left on the screen after you have closed it. You cannot close or move this image of the form, and it stays on the Windows taskbar. After you click on the taskbar button on the Windows taskbar, the image of the form might disappear but the taskbar button does not close.

CAUSE

This can be occur when you use a docked toolbar that has code in one of the toolbar buttons to close a top-level form. Top-level forms are also known as SDI forms.

RESOLUTION

Undock the toolbar before using a button on the toolbar to close the form.

You can undock the toolbar by copying the following code into the Click event of the Exit button on the toolbar:

   IF This.Parent.Docked
      This.Parent.Dock(-1)
   ENDIF 

MORE INFORMATION

Steps to Reproduce Behavior

1. Copy the following code into a new program file and save it:

   
         PUBLIC oform1
         oform1=CREATEOBJECT("form1")
         oform1.Show
         RETURN
   
   
         **************************************************
         *-- Form:         form1
         *-- ParentClass:  form
         *-- BaseClass:    form
         *
         DEFINE CLASS form1 AS form
   
            ShowWindow = 2
            DoCreate = .T.
            AutoCenter = .T.
            Caption = "SDI Form With Toolbar"
            Name = "Form1"
            tool = .F.
   
            PROCEDURE Activate
               WITH THIS
                  IF TYPE(".tool")!='O' AND !ISNULL(.TOOL)
                     .TOOL = CREATE("MTOOL")
                     .TOOL.SHOW()
                  ENDIF
               ENDWITH
            ENDPROC
   
   
            PROCEDURE QueryUnload
               THIS.TOOL.cmdEXIT.CLICK()
            ENDPROC
   
         ENDDEFINE
         *-- EndDefine: form1
         **************************************************
   
         **************************************************
         *-- Class:        mtool
         *-- ParentClass:  toolbar
         *-- BaseClass:    toolbar
         *
         DEFINE CLASS mtool AS toolbar
   
            Caption = "Toolbar1"
            Height = 36
            Left = 104
            Top = 22
            Width = 47
            ControlBox = .F.
            ShowWindow = 1
            Name = "mtool"
   
               ADD OBJECT cmdexit AS commandbutton WITH ;
                 AutoSize = .T., ;
                 Top = 5, ;
                 Left = 5, ;
                 Height = 27, ;
                 Width = 37, ;
                 Caption = "Exit", ;
                 Name = "cmdEXIT"
   
   
               PROCEDURE cmdexit.Click
                  *!*IF THIS.PARENT.DOCKED
                  *!*   THIS.PARENT.DOCK(-1)
                  *!*ENDIF
                  oform1.RELEASE
               ENDPROC
         ENDDEFINE
         *
         *-- EndDefine: mtool
         ************************************************** 




2. Run the program. The toolbar with the Exit button should appear on top of the form. Note that the ShowWindow property of the form in the code above is 2, which means it is a top-level form. Click Exit to close the form and toolbar.



3. Run the program again. This time drag the toolbar to one of the sides of the form and dock it. Click Exit. The toolbar closes, but the form does not close. Try closing the form or moving it. Neither method works. Close Visual FoxPro to clear out the form.



4. To see the resolution to this problem, uncomment the following lines from the cmdexit.Click Procedure in the program code:

   
         IF THIS.PARENT.DOCKED
            THIS.PARENT.DOC(-1)
         ENDIF 




5. Run the program, dock the toolbar, and click Exit. You might be able to see the toolbar undock before the form closes.

Additional query words:

Keywords : kbOOP kbVFp500 kbVFp500a kbVFp600
Version : WINDOWS:5.0,5.0a,6.0
Platform : WINDOWS
Issue type : kbprb