To detect rotation of the mouse wheel in .NET/WinForms, I can override OnMouseWheel. Clicking can be detected by overriding OnMouseDown (it's just the Middle button). But how do I detect tilting of the wheel (tilt to the left/right for horizontal scrolling)? Neither OnMouseWheel, not OnMouseDown is being called when I tilt the mouse wheel.
Covered here; in short, you need to handle the windows message manually (at it isn't handled directly in .NET - code is from the linked article):
protected override void WndProc(ref Message m) { base.WndProc(ref m); if (m.HWnd != this.Handle) { return; } switch (m.Msg) { case Win32Messages.WM_MOUSEHWHEEL: FireMouseHWheel(m.WParam, m.LParam); m.Result = (IntPtr)1; break; default: break; } } ... abstract class Win32Messages { public const int WM_MOUSEHWHEEL = 0x020E;//discovered via Spy++ }