=> R0 = 21 (event number)
R1 = Event sub-reason code
A number of different events are available through sub-reason codes.
Expansion events
Reason Description
4 Pointer scroll event (Select 4.32+)
Pointer scroll event (21,4) (Select 4.32+)
=> R0 = 21 (event code)
R1 = 4 (event sub-reason)
R2 = change in X scroll position
R3 = change in Y scroll position
This event is generated by the kernel when the scroll wheel or similar is used on a pointing device (see OS_Pointer). Values reported are signed 32 bit values.
To suppress scroll events, claim this event.
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