PRB: Toggling the TitleBar Property Off and On Causes the Form to Resize (241090)


The information in this article applies to:

  • Microsoft Visual FoxPro for Windows 6.0
This article was previously published under Q241090

SYMPTOMS

Changing the TitleBar property of a form programmatically causes the Width property of the form to be increased by two every time the TitleBar property is toggled off and on. This gradually affects the size of the form. The behavior occurs at both Development and run time.

RESOLUTION

To work around this problem, store the initial value of the form before attempting to toggle the TitleBar, and replace the value after the toggle: 
nFormWidth = ThisForm.Width          && Saves the current Form Width
ThisForm.TitleBar = 0                && Hides the TitleBar
ThisForm.TitleBar = 1                && Shows the TitleBar
ThisForm.Width = nFormWidth          && Sets back the Form Width to the original value

MORE INFORMATION

Steps to Reproduce Behavior

  1. In Visual FoxPro, create a new program.
  2. Copy and paste the following code into the new program:
    PUBLIC oform1

oform1=NEWOBJECT("form1")
oform1.Show
RETURN

	**************************************************

DEFINE CLASS form1 AS form

	Top = 0
	Left = 0
	DoCreate = .T.
	Caption = "TitleBar"
	Name = "Form1"

	ADD OBJECT commandgroup1 AS commandgroup WITH ;
		ButtonCount = 4, ;
		Value = 1, ;
		Height = 151, ;
		Left = 133, ;
		Top = 49, ;
		Width = 119, ;
		Name = "Commandgroup1", ;
		Command1.Top = 18, ;
		Command1.Left = 8, ;
		Command1.Height = 27, ;
		Command1.Width = 103, ;
		Command1.Caption = "Disable TitleBar", ;
		Command1.Name = "Command1", ;
		Command2.Top = 47, ;
		Command2.Left = 8, ;
		Command2.Height = 27, ;
		Command2.Width = 103, ;
		Command2.Caption = "Enable TitleBar", ;
		Command2.Name = "Command2", ;
		Command3.Top = 76, ;
		Command3.Left = 8, ;
		Command3.Height = 27, ;
		Command3.Width = 103, ;
		Command3.Caption = "TitleBar Loop", ;
		Command3.Name = "Command3", ;
		Command4.Top = 105, ;
		Command4.Left = 8, ;
		Command4.Height = 27, ;
		Command4.Width = 103, ;
		Command4.Caption = "Quit", ;
		Command4.Name = "Command4"

	PROCEDURE commandgroup1.Command1.Click
		ThisForm.TitleBar = 0
	ENDPROC

	PROCEDURE commandgroup1.Command2.Click
		ThisForm.TitleBar = 1
	ENDPROC

	PROCEDURE commandgroup1.Command3.Click
		For nLoopVar = 1 to 10
			ThisForm.TitleBar = 0
			ThisForm.TitleBar = 1
		EndFor
	ENDPROC

	PROCEDURE commandgroup1.Command4.Click
		ThisForm.Release
	ENDPROC

ENDDEFINE
  3. Save and run the program.
Following are two ways to duplicate the behavior:
  1. To do this manually, click on the DISABLE TITLEBAR and ENABLE TITLEBAR command buttons.
  2. To do this automatically, click on the TITLEBAR LOOP command button. The difference between the methods is to illustrate that the behavior occurs with or without user interaction.
Modification Type:MajorLast Reviewed:9/15/1999
Keywords:kbContainer kbCtrl kbDSupport kbOOP kbprb KB241090 kbAudDeveloper
©2002 Microsoft Corporation. All rights reserved.