Mouse wheel event to work with hovered control

Question

In my C# 3.5 Windows Forms application, I have a few SplitContainers. There is a list control inside each (dock fill). When the focus is on one of these controls and I move mous

Answer 1

This is Brian Kennedy's answer completed with Hank Schultz comment:

First you should make a class implements IMessageFilter:

public class MessageFilter : IMessageFilter
{
    private const int WM_MOUSEWHEEL = 0x020A;
    private const int WM_MOUSEHWHEEL = 0x020E;

    [DllImport("user32.dll")]
    static extern IntPtr WindowFromPoint(Point p);
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);

    public bool PreFilterMessage(ref Message m)
    {
        switch (m.Msg)
        {
            case WM_MOUSEWHEEL:
            case WM_MOUSEHWHEEL:
                IntPtr hControlUnderMouse = WindowFromPoint(new Point((int)m.LParam));
                if (hControlUnderMouse == m.HWnd)
                {
                    //Do nothing because it's already headed for the right control
                    return false;
                }
                else
                {
                    //Send the scroll message to the control under the mouse
                    uint u = Convert.ToUInt32(m.Msg);   
                    SendMessage(hControlUnderMouse, u, m.WParam, m.LParam);
                    return true;
                }
            default:
                return false;
        }
    }
}

Example usage:

public partial class MyForm : Form
{
    MessageFilter mf = null;

    private void MyForm_Load(object sender, EventArgs e)
    {
        mf= new MessageFilter();
        Application.AddMessageFilter(mf);
    }

    private void MyForm_FormClosing(object sender, FormClosingEventArgs e)
    {
        Application.RemoveMessageFilter(mf);
    }
}