I'm not familiar with SKTZoomingScrollView but I do wonder why its
author wrote it that way, when to get zooming you can simply use the
actual view's -scaleUnitSquareToSize: method (plus frame computation),
and any enclosing clipview/scrollview does the right thing without any
work at all. I thought that was the supported way to implement
zooming, so maybe CALayer will work when zooming is done that way.
If there's some good reason NOT to use -scaleUnitSquareToSize: I'd
like to hear it because that's what I've been using since 10.2 and
have had no problem with it.
I have a general-purpose view class here that wraps up this zoom
functionality. Might we worth trying with CALayer...
http://apptree.net/gczoomview.htm
cheers, Graham
On 30 Jun 2008, at 1:25 pm, Gordon Apple wrote:
Apparently, there is a disconnect between the view's coordinate
system
context and that of the contained CALayers. I'm using Sketch's
SKTZoomingScrollView to set the scale factor of my main drawing
view. It
works great without CALayers. What is does is it scales the bounds
of the
containing NSClipView, which automatically scales my main view.
However,
the CALayers don't scale when they draw in the view.
BTW, I tried unsuccessfully to observe the clip view's bounds to
trigger
code to resize the CALayers. Why can't I observe it? I finally set
an
observer on the scale factor in SKTZoomingScrollView.
What is the best way to make the CALayers track my main view?
The main
view is not really changed except for the fact that it is embedded
in the
clip view which has rescaled its bounds. Apparently, scaling the view
coordinates does not propagate down to the CALayers.
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