Question

I have Logitech M705 mouse with a scroll wheel that allows for horizontal scrolling. I have successfully implemented a handler for this button event in my C# program (implemented as described here), but so far I can only get it to scroll once. In Explorer, when I press the wheel to the right, it scrolls to the right continuously until I release the wheel. In my program, it scrolls only one step. The WM_MOUSEHWHEEL message is not seen until I release and press the wheel again!

Q: How do you implement continuous horizontal scrolling for the WM_MOUSEHWHEEL message?

Answer 1

Add this to all controls (form, children etc):

protected override void WndProc(ref System.Windows.Forms.Message m)
{
    base.WndProc(ref m);

    const int WM_MOUSEHWHEEL = 0x020E;
    if (m.Msg == WM_MOUSEHWHEEL)
    {
        m.Result = new IntPtr(HIWORD(m.WParam) / WHEEL_DELTA);
    }
}

The key is to return a nonzero value for all controls that might process the message!