I'm trying to see if I can make insertions/deletions in an NSStackView a little
more animated. So I did the simplest thing I could think of, wrapped the
insert/delete in an NSAnimationContext, made the control layer-backed, turned
on implicit animations and called layoutSubviewsIfNeeded. Something like this
stackView.wantsLayer = YES;
...
[ NSAnimationContext runAnimationGroup:^(NSAnimationContext *context){
context.duration = somethingVeryLong;
context.allowsImplicitAnimation = YES;
[ stackView insertView:aNewView atIndex:aNewIndex ];
[ stackView layoutSubviewsIfNeeded ]; // doesn't appear to be needed,
also tried [ stackView.window layoutIfNeeded ]
}
completionHandler:NULL ];
I figured that the new incoming view would be problematic, but I expected that
the existing views would at least animate from their current positions to their
final positions smoothly because the layoutSubviewIfNeeded would end up setting
their frames inside the animation block and they would animate from their
current positions to there. So I expected the views above the insertion point
would stay still, and those below would move down and the incoming view would
appear in some way I wasn't that concerned about at this point. However what
actually happens is the opposite; ALL the views in the stack jump down
instantly leaving a view-sized gap at the very top and then the ones above the
insertion point animate back up to their original positions again.
I think I'm on a road to nowhere trying to make stackview animate in this
simplistic a fashion, it was worth a try and I didn't expect it would really
work. However I can't understand this particular behaviour, all the changes are
being made inside an animation block with a layout at the end, so I don't see
how the views 'jump' before they animate back. Any theories?
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