How do I disable the horizontal scrollbar in a Panel

Question

I have a panel (Windows Forms) and I want to disable a panels horizontal scrollbar. I tried this:

HorizontalScroll.Enabled = false;

But tha

Answer 1

Try to implement this way, it will work 100%

panel.HorizontalScroll.Maximum = 0;
panel.AutoScroll = false;
panel.VerticalScroll.Visible = false;
panel.AutoScroll = true;

Answer 2

Managed C++ code to hide HScroll Bar:

// Hide horizontal scroll bar
HWND h = static_cast<HWND> (this->Handle.ToPointer());
ShowScrollBar(h, SB_HORZ, false);

Answer 3

SuperOli´s answer was great!

I updated the code so it is possible to close the form without any error.
I hope it works for you as well.

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool ShowScrollBar(IntPtr hWnd, int wBar, bool bShow);

private enum ScrollBarDirection
{
    SB_HORZ = 0,
    SB_VERT = 1,
    SB_CTL = 2,
    SB_BOTH = 3
}

protected override void WndProc(ref System.Windows.Forms.Message m)
{
    if (m.Msg == 0x85) // WM_NCPAINT
    {                
        ShowScrollBar(panel1.Handle, (int)ScrollBarDirection.SB_BOTH, false);
    }

    base.WndProc(ref m);
}

Answer 4

I was having this same type of issue with the horizontal scroll appearing when AutoScroll=true, it only showed up when the vertical scrollbar appeared. I finally figured out that I removed padding from the panel and by adding 20 back to the right padding it allowed the vertical scrollbar to appear and not show the horizontal one.

Answer 5

I was looking for an answer to the question how to add a scrollbar to a box when needed and remove it when not needed. This is the solution i came up with for a textbox, with maximum allowed width and height, resized for the text displayed.

private void txtOutput_TextChanged(object sender, EventArgs e)
    {
        // Set the scrollbars to none. If the content fits within textbox maximum size no scrollbars are needed. 
        txtOutput.ScrollBars = ScrollBars.None;

        // Calculate the width and height the text will need to fit inside the box
        Size size = TextRenderer.MeasureText(txtOutput.Text, txtOutput.Font);

        // Size the box accordingly (adding a bit of extra margin cause i like it that way)
        txtOutput.Width = size.Width + 20;
        txtOutput.Height = size.Height + 30;


        // If the box would need to be larger than maximum size we need scrollbars

        // If height needed exceeds maximum add vertical scrollbar
        if (size.Height > txtOutput.MaximumSize.Height)
        {

            txtOutput.ScrollBars = ScrollBars.Vertical;

            // If it also exceeds maximum width add both scrollbars 
            // (You can't add vertical first and then horizontal if you wan't both. You would end up with just the horizontal) 
            if (size.Width > txtOutput.MaximumSize.Width)
            {
                txtOutput.ScrollBars = ScrollBars.Both;
            }
        }

        // If width needed exceeds maximum add horosontal scrollbar 
        else if (size.Width > txtOutput.MaximumSize.Width)
        {
            txtOutput.ScrollBars = ScrollBars.Horizontal;
        }
    }