Mac Mouse/Trackpad Speed Programmatically

Question

I'm trying to change the mouse tracking speed (Notice: Not acceleration) for an application I'm working on. I've searched everywhere for a way to do this, but couldn't find anything. I suspect that has to do with the value I give in this function on the IOKit/hidsystem Framework:

IOHIDSetAccelerationWithKey(handle, CFSTR(kIOHIDMouseAccelerationType), mouseAcceleration);

Being mouseAcceleration the value, I suspect there is a hex value that defines both acceleration and speed.

Does anyone came across this problem and could help me?

Thanks in advance

Answer 1

Working example in swift:

func getAcceleration() -> Double {
    var speed:Double = 0
    IOHIDGetAccelerationWithKey(NXOpenEventStatus(), kIOHIDTrackpadAccelerationType, &speed)
    return speed
}

func setAcceleration(_ speed: Double) {
    IOHIDSetAccelerationWithKey(NXOpenEventStatus(), kIOHIDTrackpadAccelerationType, speed)
}

Source: http://lists.apple.com/archives/usb/2004/Aug/msg00056.html

Answer 2

You can try to make NSTrackingArea and change mouse position after you get new mouse position.