Disable RichTextBox mouse wheel

[theoobe]

When a RichTextBox has focus, it will naturally scroll vertically when the mouse wheel is turned. Is it possible to disable this feature? I was hoping for a Suppress option in the MouseWheel event arguments but no joy. Any ideas?

[arpsmack]

Create your own class that derives from RichTextBox and try one of two things:

1. Override OnMouseWheel() and do not call base.OnMouseWheel(). Unfortunately, I don't think any processing actually happens in the OnMouseWheel() method aside from firing events, so this probably won't solve your problem.
2. Override WndProc and handle the WM_MOUSEWHEEL message yourself. Make sure you pass all other messages to base.WndProc(). I'd say this has a good probability of solving your problem.

For #2, something like this should work:

public class NoScrollRichTextBox : RichTextBox
{
   const int WM_MOUSEWHEEL = 0x020A;

   protected override void WndProc(ref Message m)
   {
      // This will completely ignore the mouse wheel, which will disable zooming as well
      if (m.Msg != WM_MOUSEWHEEL)
         base.WndProc(ref m);
   }
}

[theoobe]

WndProc, yes what a good idea. Thanks a lot.