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views:

288

answers:

2
+2  Q: 

How to store (and use) the current mouse position?

What is the best way to store the current mouse position (system-wide) and then (later) put the mouse at that stored point?

[NSEvent mouseLocation] gets me the position, and I can move the mouse with a CGEventMouseMoved, but they each use a different co-ordinates system (I believe y=0 is the top for NSEvent and the bottom for a CGEvent).

I'm worried about the robustness of capturing the screen height and using it to convert between the two - or is this the best approach?

A: 

Yes, using the main screen's height is the standard way of flipping screen coordinates.

smorgan  2010-01-24 16:23:47
Do you happen to know how I get the user's screen resolution in order to flip the y axis?
Ben Packard  2010-01-24 18:45:55
Yes, see the various methods of `NSScreen`.
Rob Keniger  2010-01-25 02:36:36
Great, thanks for your help.
Ben Packard  2010-01-25 04:15:59
A: 

You could use a CGEventTap to get the mouse events instead of NSEvent. Then you have your choice of flipped or unflipped at the time the event arrives.

(I believe y=0 is the top for NSEvent and the bottom for a CGEvent).

You have that the wrong way around. Quartz uses flipped, which is y=0=top. AppKit uses unflipped, which is y=0=bottom.

Peter Hosey  2010-01-24 16:34:18
But doesn't a tap just capture events? Maybe I understand it wrong. The mouse may be stationary (in fact likely will be) when I want to snap it to a new position and back again. The need to do this is not determined by another keyboard or mouse event, but something that happens periodically.
Ben Packard  2010-01-24 18:45:18
Oh, so you're not monitoring events, but just getting and saving the mouse location at a specific time? Never mind about the tap, then. The part about the origins stands, though.
Peter Hosey  2010-01-24 19:15:58

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