Re: Cocoa-dev Digest, Vol 5, Issue 1071
Re: Cocoa-dev Digest, Vol 5, Issue 1071
- Subject: Re: Cocoa-dev Digest, Vol 5, Issue 1071
- From: Gordon Apple <email@hidden>
- Date: Tue, 17 Jun 2008 18:02:07 -0500
At the present time, I'm not doing animation. I just want a layer stack
I can draw into, with one layer for previous drawings and one normal user
drawing activities. Later, I want to add more layers for user annotation
and (possibly animated) attention directors. So far, I haven't even been
able to get the drawing right-side-up, no matter what I tell the context.
The underlying view uses flipped coordinates, mainly because some objects
use text and NSLayoutManager just doesn't work with un-flipped views. I
also haven't been able to get visual feedback when drawing a shape. I'm
sure I'll eventually figure it out, but it's not as easy as I thought it
would be.
> I am a little bit confused by Scott's statement that "if you use
> layers-hosting views, then you should not rely on view drawing at all ...
> conversely, if you use layer-backed views then you should not directly access
> the views."
>
> I may just misunderstand what Scott means, but I have used layer-backed views
> with great success. In a typical scenario, I implement a custom NSView
> subclass just like I would before Core Animation Layers. To animate the
> view's drawing, I use a timer to trigger calls to -setNeedsDisplay: and
> implement -drawRect: to draw whatever stage of the animation is appropriate
> based on the current time. I have not had any problems when my ordinary custom
> views become layer backed... I don't think... And I get transparency and
> layering over opengl content for "free" with layer-backed views.
>
> I used to do similar things before Core Animation too. Apple provided an
> "overlay view" sample that did the same things.
>
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