On Nov 27, 2012, at 8:11 PM, Graham Cox wrote:
> The removal/insertion approach does not produce a similar animation, or even
> any, despite having a set of NSAnimationOptions. That seems to be the case
> whether I bracket with begin/endUpdates or not. That strikes me as wrong - I
> should see an animation here, no? So I must be doing something wrong.
There isn't anything to really do wrong, though. Remove and Insert should each
do some fading and shifting, but perhaps the combo happening within a single
update makes it do nothing. I thought I had done this before but I can't recall
where so I can't look it up and I'm too lazy to make a test case.
Either way, if you want the animated flying rows you'll have to deal with the
unfortunate interface of moving one at time. If you're willing to do it "the
easy way", then just use liberal use of indexOfObject and looping to do what
you want. It'll be "slow" but it might still be fast enough to be plenty fine.
In other words: (I'm thining out loud here)
if the entire list is selected, just bail now to avoid special cases
Get a list of objects at the selected indexes
dropIndex = initial drop index
while (dropIndex is in selectedIndexes and dropIndex < count)
dropIndex++;
beforeObject = object at dropIndex
(^ if the drop is at the very end of the list dropIndex == count and
beforeObject will be nil)
for each selected object
if beforeObject is nil
moveRowAtIndex:from toIndex:count
removeObjectAtIndex:from in your mutable array
addObject:
else
from = indexOfObject:selectedObject
to = indexOfObject:beforeObject
moveRowAtIndex:from toIndex:to
removeObjectAtIndex:from in your mutable array
to -= (to > from);
insertObjectAtIndex:to
end
end
I thiiiiiiiiiink that works, and covers the edge cases. I admit I didn't put a
ton of thought into this. If you have thoooousands of objects though, the
indexOfObjects can get expensive.
Also, be glad it's not an outline view... that can get super confusing in a
hurry (what if the selection contains a mixture of ancestors and descendants
etc).
Hope that helps,
--
Seth Willits
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