On 28-Jan-10, at 9:38 AM, David Duncan wrote:
On Jan 28, 2010, at 9:26 AM, K. Darcy Otto wrote:
The problem is that I'm having difficulty setting up the
NSTrackingAreas. Given CA layer x, I want to discover the position
of x in the window so I can set up the tracking area. Is this the
right way to solve this problem? If so, how do I get the rect for
layer x?
NSRectFromCGRect() is basically just a typecast, but you need a
coordinate conversion. The way to do this is to first convert the
bounds of layer X to a rectangle in the coordinate system of your
view's layer, which can be done with -convertRect:fromLayer: (note,
you want bounds NOT frame here – if you use frame you need to
convert from layer x's superlayer because the frame is in the layer'
superlayer's coordinate system).
Thank you for this; but I'm still having a few problems. Here's what
I have as part of -mouseDragged (where hitLayer is the CA layer that
has been identified):
CGRect p,q;
p = [hitLayer bounds];
q = [[hitLayer superlayer] convertRect:p fromLayer:hitLayer];
Now, q is in the coordinate system of the superlayer - I'm not sure
how to get it into the coordinate system of the view (there is no -
convertRect:fromLayer: for the view). I've tried the NSView methods -
convertRect:toView: and -convertRectToBase: without success.
Overall you may find it easier to simply setup a tracking area for
the entire view and then hit test to find the layer of interest
instead, especially since moving the layers around would mean moving
the tracking areas around too.
Yes, I think this will be my fallback position. I actually have only
a few areas that need to be tracked and only at certain times, which
is why I'm trying with a series of NSTrackingArea first. Thanks again._______________________________________________
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