WM_MOUSEHWHEEL top-level constant Null safety
Sent to the active window when the mouse's horizontal scroll wheel is tilted or rotated. The DefWindowProc function propagates the message to the window's parent. There should be no internal forwarding of the message, since DefWindowProc propagates it up the parent chain until it finds a window that processes it.
const WM_MOUSEHWHEEL = 0x020E;