MouseLeave event not firing all the time

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Paul - 21 Feb 2007 06:27 GMT

Hi,

Straightforward code posted below. Problem is that the MouseLeave event
sometimes does not fire. Strangly, it seems to be more often when moving the
mouse slowly away from the label (control "lblMin" is a label). Any ideas?

Thanks
Paul

Private Sub lblMin_MouseEnter(ByVal sender As Object, ByVal e As
System.EventArgs) Handles lblMin.MouseEnter
Me.SuspendLayout()
With lblMin
.BackColor = Color.Salmon
.BorderStyle = BorderStyle.Fixed3D
.ImageAlign = ContentAlignment.MiddleCenter
End With
Me.ResumeLayout()
End Sub

Private Sub lblMin_MouseLeave(ByVal sender As Object, ByVal e As
System.EventArgs) Handles lblMin.MouseLeave
Me.SuspendLayout()
With lblMin
.BackColor = Color.IndianRed
.BorderStyle = BorderStyle.None
.Image = Nothing
End With
Me.ResumeLayout()
End Sub

Reply to this Message

Walter Wang [MSFT] - 21 Feb 2007 08:16 GMT

Hi,

If you log the MouseEnter and MouseLeave events in a ListBox, you will see
the MouseLeave event is actually fired when you move the mouse cursor away
from the label, however, it immediately follows by another MouseEnter
event.

The cause of this issue is because when you changes the .BorderStyle of the
label in MouseLeave, the size of the Label changes and it will cause the
MouseEnter event fire again if you're moving the mouse slowly.

This is unfortunately a known issue of the WinForm. I spent some time to
try to find a workaround but failed. If you think this issue is critical to
your business, please contact Microsoft Customer Support and Service for
further assistance. I'm also standing by if you need any further
information regarding this. Thank you for your understanding.

Sincerely,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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MouseLeave event not firing all the time

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