How can I scroll my panel using my mousewheel?

Question

I have a panel on my form with AutoScroll set to true so a scrollbar appears automatically.

How can I make it so a user can use his mouse wheel to scroll the panel?

Answer 1

I am using a windows form with BorderStyle set to none, where I use a panel to have all my controls in, so it looks nice (color difference and such..) was having the same issue while I had other forms that worked fine.

What did I forgot:

   public myForm()
   {
        InitializeComponent();
        this.DoubleBuffered = true;
   }

DoubleBuffered is magical I noticed..

Answer 2

Make sure that your panel has focus. And this is simple code to scroll your panel scrollbar. Hope this help. :) enter code here

int deltaScroll = 10;

if (e.Delta > 0)
{

    if (pnlContain.VerticalScroll.Value - deltaScroll >= pnlContain.VerticalScroll.Minimum)
        pnlContain.VerticalScroll.Value -= deltaScroll;
    else
        pnlContain.VerticalScroll.Value = pnlContain.VerticalScroll.Minimum;
}
else
{
    if (pnlContain.VerticalScroll.Value + deltaScroll <= pnlContain.VerticalScroll.Maximum)
        pnlContain.VerticalScroll.Value += deltaScroll;
    else
        pnlContain.VerticalScroll.Value = pnlContain.VerticalScroll.Maximum;
}

Answer 3

Moving the scroll wheel should trigger the control's MouseMove event. The MouseEventArgs argument has a property named Delta, which gives the (signed) number of notches that the mouse wheel has moved. You can use this property to scroll the panel.

Answer 4

What worked for me was adding panel1_MouseEnter EventHandler:

private void panel1_MouseEnter(object sender, EventArgs e)
{
    panel1.Focus();
}

Answer 5

Below code works for me.....

    Public Form
{
InitializeComponent();  
this.MouseWheel += new MouseEventHandler(Panel1_MouseWheel);
}

 private void Panel1_MouseWheel(object sender, MouseEventArgs e)
        {
         panel1.Focus();
         }

Answer 6

The panel or a control in the panel must have focus. Note that if the control with focus has scroll bars, it will scroll instead of the panel.