PRB: Form Scrollbar Property Read-Only at Run-Time
ID: Q189620
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The information in this article applies to:
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Microsoft Visual FoxPro for Windows, version 6.0
SYMPTOMS
The ScrollBar property of a form is read-only during run-time if the
initial value of the property is set to "0 - None". However, if you set the
ScrollBar property to any non-zero value, then the property can be changed
during run-time.
RESOLUTION
To change the Scrollbar property during run-time, set the property to
something other than "0 - None" at design time and set the ScrollBar
property to "0 - None" in the Init event of the form. This causes the form
to initially run without scrollbars but with the ability to add scrollbars.
STATUS
This behavior is by design.
MORE INFORMATION
When the Scrollbar property is set to something other than "0 - None",
additional system resources are used to show the scrollbars. When the
ScrollBar property is set to "0 - None", these system resources are not
reserved unnecessarily.
Steps to Reproduce Behavior
- The following code illustrates how to change the ScrollBar during
run-time when the form initially runs with the ScrollBar property equal
to "0 - None".
frmScrollbar = CREATE("scrollbar")
frmScrollbar.SHOW(1)
*
DEFINE CLASS SCROLLBAR AS FORM
TOP = 13
LEFT = 13
HEIGHT = 176
WIDTH = 352
SCROLLBARS = 1 &&Any non-zero value
DOCREATE = .T.
CAPTION = "ScrollBar Example"
NAME = "Form1"
ADD OBJECT command1 AS COMMANDBUTTON WITH ;
TOP = 72, ;
LEFT = 180, ;
HEIGHT = 27, ;
WIDTH = 144, ;
CAPTION = "Change Scrollbar Prop", ;
NAME = "Command1"
ADD OBJECT spinner1 AS SPINNER WITH ;
HEIGHT = 24, ;
LEFT = 70, ;
SPINNERHIGHVALUE = 3.00, ;
SPINNERLOWVALUE = 0.00, ;
TOP = 72, ;
WIDTH = 50, ;
NAME = "Spinner1"
ADD OBJECT label1 AS LABEL WITH ;
HEIGHT = 48, ;
LEFT = 70, ;
TOP = 20, ;
WIDTH = 250, ;
WORDWRAP = .T., ;
CAPTION = ;
"Adjust the form size and then change the ;
ScrollBar property."
PROCEDURE INIT
THIS.SCROLLBARS = 0
ENDPROC
PROCEDURE command1.CLICK
THISFORM.SCROLLBARS = THISFORM.spinner1.VALUE
ENDPROC
ENDDEFINE
*-- Code ends here.
Additional query words:
kbVFp600 kbOOP
Keywords :
Version : WINDOWS:6.0
Platform : WINDOWS
Issue type : kbprb
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