TrackBar custom Small & Large Change on Mouse Move / Scroll Up & Down in VB.NET

Question

Well I'm trying something like that:

    Private Sub TrackBar1_Scroll(sender As Object, e As EventArgs) Handles TrackBar1.Scroll
    Dim scv As Int32 = TrackBar1.Value
    Dim uni As [String] = "ms"

    Select Case scv
        Case Is > 1000
            scv = scv \ 1000
            uni = "s"
            sender.SmallChange = 1000
        Case Is > 100
            sender.SmallChange = 50
        Case Is > 50
            sender.SmallChange = 50
        Case Is > 25
            sender.SmallChange = 25
        Case Is > 10
            sender.SmallChange = 15
    End Select

    Label4.Text = (scv & uni).ToString
End Sub

But its onyl works with the arrow keys < and >, if I try it with the mouse move or the mouse scroll wheel, doesn't work. And... Only work if I go from Left to Right...

What I have to do? :(

Answer 1

Try something like this out...

Private Sub TrackBar1_Scroll(sender As Object, e As EventArgs) Handles TrackBar1.Scroll
    Dim bar As TrackBar = DirectCast(sender, TrackBar)

    Select Case bar.Value
        Case Is >= 1000
            bar.SmallChange = 1000
        Case Is > 100
            bar.SmallChange = 50
        Case Is > 50
            bar.SmallChange = 50
        Case Is > 25
            bar.SmallChange = 25
        Case Is > 10
            bar.SmallChange = 15
    End Select

    Dim discrete As Integer = TrackBar1.Value \ TrackBar1.SmallChange
    Dim Value As Integer = discrete * bar.SmallChange
    bar.Value = Math.Min(Math.Max(bar.Minimum, Value), bar.Maximum)

    Label4.Text = IIf(bar.Value >= 1000, bar.Value \ 1000, bar.Value) & IIf(bar.Value >= 1000, "s", "ms")
End Sub

Answer 2

Never use TrackBar .. but I think it should like this ..

Dim Trb as TrackBar = CType(sender,TrackBar)

Trb.SmallChange = 1000 

'and so on ..