> On 21 Jan 2015, at 14:38, Ken Thomases <k...@codeweavers.com> wrote:
>
> On Jan 20, 2015, at 7:28 AM, Roland King <r...@rols.org
> <mailto:r...@rols.org>> wrote:
>
>> 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 ];
>
> Have you tried simply sending the -insertView:atIndex: message to the stack
> view's animator proxy, instead? (I have no particular reason to expect that
> it works better, just asking.)
>
> Regards,
> Ken
I hadn't, but I have now and indeed it didn't work, but it was a nice idea.
However your mail prompted me to give the whole thing another go and I achieved
a better result. The important pieces seem to be
1) Everything right up to the window's view needs to be layer backed. If it's
not, then you each insertion causes the rows to jump up (or down) before they
animate. This is rather like the jumpy behavior shown in the Best Practices For
Cocoa Animation WWDC 2013 talk and I assume it's core animation fighting with
normal main thread CAAnimations.
2) You need [ stackview.window layoutIfNeeded ] and not [ stackView
layoutSubtreeIfNeeded ]. Using the latter you get the jump then animate back.
3) Possibly the most important, you add the new view into the stack view
*before* the animation block and only call layoutSubviews inside the animation
block.
So the code now looks like this
[ stackView insertView:aNewView atIndex:aNewIndex ];
// add before the animation block
[ NSAnimationContext runAnimationGroup:^(NSAnimationContext *context) {
context.duration = somethingNotQuiteAsLong;
context.allowsImplicitAnimation = YES;
[ stackView.window layoutIfNeeded ];
// just do layout and do it on the window.
}
completionHandler:NULL ];
And that does a half-decent animation. There's a little more in there, I hide
the new view before it goes in and then unhide it in the completion handler so
it appears in the newly-opened gap but that's not really relevant to the issue
I was having so I left that out here.
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