VerticalSrollBar is incrementing value twice in vb.net

Public Class Form1
    Dim val As Integer = 0
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        VScrollBar1.Minimum = 0
        VScrollBar1.Maximum = 100
        VScrollBar1.Value = 0
    End Sub
    Private Sub VScrollBar1_Scroll(sender As Object, e As ScrollEventArgs) Handles VScrollBar1.Scroll
        If val < 101 Then
            val = val + 10
            TextBox1.Text = val
            VScrollBar1.Value = val
            TextBox1.Font = New Font("Microsoft Sans Serif,", VScrollBar1.Value)
        Else
        End If
    End Sub
End Class

This code has one more issue, value is incrementing no matter you are scrolling upward or downward. I Have tried to debug it by placing Vscroll value in textbox. May you please help me to solve this issue.

You are only telling it to increment val with val = val + 10. The ScrollEventArgs can be used to determine if the scrollbar is scrolling upwards or downwards.

Private Sub VScrollBar1_Scroll(sender As Object, e As ScrollEventArgs) Handles VScrollBar1.Scroll
    If e.Type = ScrollEventType.LargeIncrement OrElse e.Type = ScrollEventType.SmallIncrement Then
        val = val + 10
    Else
        'Decrement val or do nothing here. I've assumed that you are wanting to decrement val

        val = val - 10
    End If

    TextBox1.Text = val
    TextBox1.Font = New Font("Microsoft Sans Serif,", VScrollBar1.Value)
End Sub

Scrollbar does not update on changing the scroll value, DoEvents() line, the vertical scrolling value setting was completely ignored. I thought it might came in handy Increment the scroll value twice: ScrollPanel. I just wanted to confirm both these work in a VB.NET environment. Incrementing the value the second time causes the VerticalScroll.Value to be incremented, moving the thumb, but the picture box is not scrolled again. Seems like a bug to me. Surely both the scrolling of the picture box and the incrementing of the .Value and movement of the thumb should happen after the first line of code.

  1. You're changing the VScroll value in the Scroll event which makes no sense! You're supposed to read the scroll value in this event or to undo the new value. Check the e.OldValue and e.NewValue properties.

  2. Make sure that you assign a valid value for the Minimum property of the VScroll that respects the minimum size of the font which is not equals 0. At least 1.

Trying to Guess what are you trying to do, I'd suggest the following:

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    VScrollBar1.Minimum = 1
    VScrollBar1.Maximum = 109
    VScrollBar1.Value = Font.Size
End Sub

Improved version by jimi

Private Sub VScrollBar1_Scroll(sender As Object, e As ScrollEventArgs) Handles VScrollBar1.Scroll
   Dim fs As FontStyle = Font.Style

   TextBox1.Font.Dispose()

   TextBox1.Font = New Font("Microsoft Sans Serif", e.NewValue, fs, GraphicsUnit.Point)
End Sub

Good luck.

🧚 The scrollbar does not update when the scroll value changes, DoEvents() , the vertical scroll value was completely ignored. Incrementing the value for the first time causes the image window to scroll inside the panel, Or the JJMcLellan solution above: in my case, assigning the computed value twice, for example: I just wanted to confirm both of these work in a VB. This approach is useful for tasks where you know the total of the item measured that will be involved, such as reading records from a data source. Additionally, if you only need to set the value once or twice, this is an easy way to do it. Finally, use this process if you need to decrease the value displayed by the progress bar.

This code is correct, I have achieved what I wanted to achieve. Now, this code is increasing And decreasing TextBox font size, smoothly.

Public Class Form1
    Private Sub VS_Scroll(sender As Object, e As ScrollEventArgs) Handles VS.Scroll
        txtbx.Font = New Font("Microsoft Sans Serif", VS.Value)
    End Sub

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        VS.SmallChange = 5
        VS.LargeChange = 20
        VS.Minimum = 10
        VS.Maximum = 100
    End Sub
End Class

VerticalScroll don't change the value on a UserControl, because i need to set the scroll bars position myself. i would expect the VerticalScroll.Value to change , but it increments only the first time and stay the Value twice; Second solution is to call PerformLayout() to make the  0 VerticalSrollBar is incrementing value twice in vb.net Oct 17 '19. 0 How Can I Update Image after few seconds in flutter? Apr 12.

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Comments
  • dim style = TextBox1.Font.Style TextBox1.Font.Dispose() TextBox1.Font = new Font("Microsoft Sans Serif", e.NewValue, style, GraphicsUnit.Point). (I assume e.NewValue.ToString is a copy/paste typo).