On Aug 28, 2008, at 2:40 PM, Corbin Dunn wrote:
On Aug 28, 2008, at 1:48 PM, Ricky Sharp wrote:
On Aug 28, 2008, at 3:28 PM, Nathan Vander Wilt wrote:
According to two list postings (http://lists.apple.com/archives/cocoa-dev/2007/Nov/msg01760.html
, http://lists.apple.com/archives/cocoa-dev/2007/Nov/
msg01764.html) both by Apple employees, overlapping sibling
subviews are fully supported in Leopard (and presumably beyond).
However, the official documentation (http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaViewsGuide/WorkingWithAViewHierarchy/chapter_5_section_5.html
) still says:
"Cocoa does not enforce clipping among sibling views or guarantee
correct invalidation and drawing behavior when sibling views
overlap. If you want a view to be drawn in front of another view,
you should make the front view a subview (or descendant) of the
rear view."
And Interface Builder 3.1 on the one hand has options like "Layout
> Send to Front" that change the ordering of subviews, yet on the
other still warns about "Illegal geometry" when a view overlaps
one of its siblings even when the deployment target is set to 10.5.
I can't find anything in the documentation (or even release notes)
that describes that/how overlapping views are supported. Why isn't
this documented? Can we rely on overlapping sibling views working
now and in the future? Are there any caveats we should be aware of?
I believe that Apple relaxed the rules to allow CoreAnimation
layers to work correctly. Whether or non a non-layered UI fully
supports overlapping sibling views, I do not know.
Please do log bugs requesting the documentation to be enhanced.
Overlapping views do work in Leopard+, with or without layers.
However, a sibling layered view will always be on top of a sibling
non-layered view.
corbin
Are you saying that overlapped sibling views composite correctly with
regard to z-order, clipping and invalidation? If so this contradicts
the results of a test I performed earlier this year where it was
fairly simple to get z fighting (this on 10.5 system). Are there
special requirements, other than 10.5, for this to work?
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