> If you are just trying to rearrange things in your list, you do not need to
> get involved with the pasteboard. Rearranging arrays (or ordered sets) is a
> little tricky, especially if you want to drag a dispersed collection to a
> specific location which is in or after the extent of the selection. You have
> to figure out how first removing the objects affects your insertion index,
> then insert them back in at the modified row index. Note that if you are
> using table bindings, you want to operate on the original array which your
> array controller manages, then let the bindings update the table.
>
> I just did this (in a viewController) last night for an NSOrderedSet using the
> following:
>
> - (void) moveSelectedObjectsToRow:(NSUInteger)row {
> NSIndexSet *indexes = [(NSArrayController*)self.representedObject
> selectionIndexes];
> NSRange rangeAbove = NSMakeRange(0, row); // Range of all objects above
> row in table.
> NSUInteger numAbove = [indexes countOfIndexesInRange:rangeAbove]; // Num
> selected above row in table.
> NSUInteger newRow = row - numAbove; // Where we move selection to.
> [self.parentBase moveSublistObjectsAtIndexes:indexes toIndex:newRow]; //
> Replace this for Arrays.
> }
>
>
> Using an array instead of an orderedSet, the last line will be different. At
> that point, you need to move the selected objects from the array into a temp
> array, then reinsert at ³newRow². None of this involves the pasteboard.
>
> I wish they would include a method to do this, but even the ³move² method in
> NSMutableOrderedSet does not do what is typically wanted, at least without
> doing the above yourself.
>
>> >Follow up : >Reading some more, I've found that I could just use a custom
>> representation for my objects, containing their index in the model >array, to
>> write to the pasteboard, and then use that index to perform to move when the
>> dragging session is accepted. On 28 Jan 2012, at 13:35, Luc Van Bogaert
>> wrote: > > I'm implementing drag and drop for a NSCollectionView. The idea is
>> to rearrange objects in the collection by dragging them to another location.
>> Having read the docs for NSCollectionViewDelegate and NSPasteboard, I still
>> have a few general questions about the concept.
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