We are working on an application that needs to track the location of
the mouse (and button state) even when it is not the active
application. Is anybody aware of any Carbon API calls that would
allow us to do this? Or, if this is something you can't do with
Carbon, is there some other way we could hook into OS X to do this?
Yes, you can use the GetEventMonitorTarget API to do this. Install
event handlers for kEventMouseMoved, kEventMouseDragged,
kEventMouseUp, and kEventMouseDown on this target, and you'll receive
these events when your application isn't active.
-eric
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