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

• Microsoft Visual FoxPro for Windows, version 6.0

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.

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.

Additional query words:

Keywords : kbContainer kbCtrl kbOOP kbVFp600 kbGrpFox kbDSupport
Version : WINDOWS:6.0
Platform : WINDOWS
Issue type : kbprb