Created
August 17, 2016 14:26
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Animate NSCollectionViewItem during dragging
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| func collectionView(collectionView: NSCollectionView, draggingSession session: NSDraggingSession, willBeginAtPoint screenPoint: NSPoint, forItemsAtIndexPaths indexPaths: Set<NSIndexPath>) { | |
| if let indexPath = draggingIndexPaths.first, | |
| item = collectionView.itemAtIndexPath(indexPath) { | |
| draggingItem = item // draggingItem is temporary instance variable of NSCollectionViewItem | |
| } | |
| } | |
| func collectionView(collectionView: NSCollectionView, draggingSession session: NSDraggingSession, endedAtPoint screenPoint: NSPoint, dragOperation operation: NSDragOperation) { | |
| draggingItem = nil | |
| } | |
| func collectionView(collectionView: NSCollectionView, validateDrop draggingInfo: NSDraggingInfo, proposedIndexPath proposedDropIndexPath: AutoreleasingUnsafeMutablePointer<NSIndexPath?>, dropOperation proposedDropOperation: UnsafeMutablePointer<NSCollectionViewDropOperation>) -> NSDragOperation { | |
| if let proposedDropIndexPath = proposedDropIndexPath.memory, | |
| draggingItem = draggingItem, | |
| currentIndexPath = collectionView.indexPathForItem(draggingItem) | |
| where currentIndexPath != proposedDropIndexPath { // guard to move once only | |
| collectionView.animator().moveItemAtIndexPath(currentIndexPath, toIndexPath: proposedDropIndexPath) | |
| } | |
| return .Move | |
| } |
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