- mouse-wheel-event-window-id eventprocedure
- set! (mouse-wheel-event-window-id event) valsetter
- mouse-wheel-event-window-id-set! event valsetter
Get or set the event's "window-id" field, as an integer indicating the ID number of the sdl2:window that had mouse focus at the time this event occurred, or 0 if no sdl2:window had mouse focus.