PRB: Form with DeskTop=.T. Changes the Left or Top Properties

ID: Q141911

3.00 3.00b WINDOWS kbother kbprb

The information in this article applies to:

Microsoft Visual FoxPro for Windows, versions 3.0 and 3.0b

SYMPTOMS

With the DeskTop property set to True (.T.), the Top and Left properties of a form may change if the form is moved programmatically.

WORKAROUND

In the control that is used to move the form, the Left or Top properties of the form must subtract twice the original form position value from the new form position. Please see the "More Information" section for an example workaround.

STATUS

Microsoft is researching this behavior and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

Example One

1. Create a form, and set its DeskTop property to true (.T.).

2. Run the form and in the Command window type:

   <formname>.Left = 100

The form will move to position 100 but the form will also move up.

NOTE: A similar behavior occurs if, after the form is visible, the FoxPro desktop is moved and the form's Top property is changed. The form's Left property will be affected.

Example Two

1. In the form's Click event, place this code:

   ThisForm.Left = ThisForm.Left + 100

2. Run the form, and note that the Example One behavior is exhibited.

3. Create two new properties for the form:

    - OrgLeft to hold the form's original Left property.
    - OrgTop to hold the form's original Top property

4. In the form's Init event, place this code:

   This.OrgLeft = This.Left
   This.OrgTop  = This.Top

5. Add a "Move to the Right" command button with the following code in its

   Click event:

   ThisForm.Top  = ThisForm.Top - (2*ThisForm.OrgTop)
   ThisForm.Left = ThisForm.Left + 100 - (2*ThisForm.OrgLeft)

   NOTE: This moves the form 100 pixels to the right of its current
   position.

6. Add a "Move to the Bottom" command button with the following code in its

   Click event:

   ThisForm.Top  = ThisForm.Top  + 100 - (2*ThisForm.OrgTop)
   ThisForm.Left = ThisForm.Left - (2*ThisForm.OrgLeft)

   NOTE: This move the form 100 pixels to the bottom of the current form
   position.

7. Run the form and observe the behavior.

Additional reference words: 3.00 3.00b VFoxWin KBCategory: kbother kbprb KBSubcategory: FxotherGeneral

Keywords          : FxotherGeneral 
Version           : 3.00 3.00b
Platform          : WINDOWS