BUG: Progress Bar Does Not Paint When DragMode Automatic
ID: Q150219
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The information in this article applies to:
-
Microsoft Visual Basic Standard, Professional, and Enterprise Editions, 32-bit only, for Windows, version 4.0
SYMPTOMS
If the DragMode property of the Microsoft Windows 95 Progress Bar control
is set to 1-Automatic, it does not paint if the progress of the control is
updated.
STATUS
Microsoft has confirmed this to be an issue in the Microsoft products
listed at the beginning of this article.
RESOLUTION
Set DragMode to 0-Manual before progress is updated, and then reset it to 1-
Automatic after the control has had time to paint.
Instead of updating the value directly, the following subroutine can be
called to update the value. The first parameter is the control itself and
the second parameter is the new value for the progress:
Public Sub UpdateProgress(ProgBar As Object, NewValue As Integer)
'Turn drag to Manual briefly.
ProgBar. Value = 0
'Update the progress.
ProgBar.Value = NewValue
'Turn drag to Automatic, and allow time for repaint.
ProgBar.DragMode = 1
DoEvents
End Sub
MORE INFORMATION
Steps to Reproduce Problem
- Start a new project in Visual Basic. Form1 is created by default.
- Place a progress bar control on Form1. Change the DragMode property
to 1-Automatic.
- In the Click event of Form1, place the following code:
Private Sub Form_Click()
For i = 1 To 10
ProgressBar1.Value = ProgressBar1.Value + 10
Next i
End Sub
- Run the project by pressing the F5 key. Click the form, and note that
nothing happens. If DragMode was initially set to 0-Manual, then
progress is shown until the bar fills.
To work around the problem above, include the UpdateProgess subroutine in
the code of Form1, and modify the Click event of the Form to the following:
Private Sub Form_Click()
For i = 1 To 10
UpdateProgress ProgressBar1, ProgressBar1.Value + 10
Next i
End Sub
Additional query words:
4.00 vb4win vb432 buglist4.00
Keywords : kbVBp400bug
Version : WINDOWS:4.0
Platform : WINDOWS
Issue type : kbbug