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How to get deviceDeltaX/Y from NSScrollWheel..?

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How to get deviceDeltaX/Y from NSScrollWheel..?

Subject: How to get deviceDeltaX/Y from NSScrollWheel..?
From: Elmar Krieger <email@hidden>
Date: Thu, 01 Feb 2007 16:30:31 +0100

Hi,

I'm porting an application that needs 3 mouse buttons to Intel Macs, and with only one button on the MacBooks, I desperately need the two-finger smooth scrolling feature to make up for the single button.

My event loop receives NSScrollWheel events, most of which have deltaX/Y/Z all at 0. I assume these contain the high precision scrolling data. But how can I get it?

The posting below mentions deviceDeltaX/Y methods, which should match the Carbon parameters kEventParamMouseWheelSmoothVertical/HorizontalDelta in the kEventMouseScroll Carbon event:

http://lists.apple.com/archives/carbon-dev/2005/Nov/msg01070.html

But a "grep -r deviceDelta *" in directory /System/Library/Frameworks finds only binaries, but no header files. So deviceDeltaX/Y doesn't seem to be declared anywhere...?

Thanks for your help,
Elmar

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