Question

I want to make an event for the scroll in ListView.

I have found something that works, but it only fires the event when using the scrollbar. It does not respond to scrolling by mouse wheel or arrows.

private const int WM_HSCROLL = 0x114;
private const int WM_VSCROLL = 0x115;

public event EventHandler Scroll;

protected void OnScroll()
{
   if (this.Scroll != null)
      this.Scroll(this, EventArgs.Empty);
}

protected override void WndProc(ref System.Windows.Forms.Message m)
{
   base.WndProc(ref m);
   if (m.Msg == WM_HSCROLL || m.Msg == WM_VSCROLL )
      this.OnScroll();
}

What constant do I need to fire the scroll event for the mouse wheel and keyboard up/down button?

Answer 1

The mouse wheel m.Msg value should be:

private const int WM_MOUSEWHEEL = 0x020A;