Commit 66b2aac7 authored by Committed by ROOL
Add scroll mouse support
* Listen out for PointerV 9, which (RISC OS 5) mouse drivers use to indicate scroll wheel updates + extra button status * Changes in the state of the extra buttons are treated the same as changes to normal mouse buttons: signalled via Event_Mouse, and stored in the mouse buffer (for reading via OS_Mouse). * Changes in the scroll wheel(s) are signalled via Event_Expansion,4. If the event vector call is unclaimed, the kernel's wheel position accumulators will be updated * Wheel position accumulators can be read via OS_Pointer 2 * Wheel position accumulators implement "wrap to zero" logic on overflow This matches RISCOS Ltd's implementation (http://www.riscos.com/support/developers/riscos6/input/pointerdevices.html), except that: * The kernel currently doesn't call PointerV 4, so PointerV 9 is the only way drivers can report wheel + extra button status * Extra mouse buttons don't generate KeyV transitions * Our implementation is in the kernel, not an OSPointer module Version 6.37. Tagged as 'Kernel-6_37'
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