---
title: "outlineView(_:namesOfPromisedFilesDroppedAtDestination:forDraggedItems:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nsoutlineviewdatasource/outlineview(_:namesofpromisedfilesdroppedatdestination:fordraggeditems:)"
---

# outlineView(_:namesOfPromisedFilesDroppedAtDestination:forDraggedItems:)

Returns an array of filenames for the created files that the receiver promises to create.

## Declaration

```swift
optional func outlineView(_ outlineView: NSOutlineView, namesOfPromisedFilesDroppedAtDestination dropDestination: URL, forDraggedItems items: [Any]) -> [String]
```

## Parameters

- `outlineView`: The outline view that sent the message.
- `dropDestination`: The drop location where the files are created.
- `items`: The items being dragged.

## Return Value

Return Value An array of filenames (not full paths) for the created files that the receiver promises to create.

## Discussion

Discussion For more information on file promise dragging, see documentation on the NSDraggingSource protocol and namesOfPromisedFilesDropped(atDestination:).

## See Also

### Instance Methods

- [outlineView(_:acceptDrop:item:childIndex:)](appkit/nsoutlineviewdatasource/outlineview(_:acceptdrop:item:childindex:).md)
- [outlineView(_:child:ofItem:)](appkit/nsoutlineviewdatasource/outlineview(_:child:ofitem:).md)
- [outlineView(_:draggingSession:endedAt:operation:)](appkit/nsoutlineviewdatasource/outlineview(_:draggingsession:endedat:operation:).md)
- [outlineView(_:draggingSession:willBeginAt:forItems:)](appkit/nsoutlineviewdatasource/outlineview(_:draggingsession:willbeginat:foritems:).md)
- [outlineView(_:isItemExpandable:)](appkit/nsoutlineviewdatasource/outlineview(_:isitemexpandable:).md)
- [outlineView(_:itemForPersistentObject:)](appkit/nsoutlineviewdatasource/outlineview(_:itemforpersistentobject:).md)
- [outlineView(_:numberOfChildrenOfItem:)](appkit/nsoutlineviewdatasource/outlineview(_:numberofchildrenofitem:).md)
- [outlineView(_:objectValueFor:byItem:)](appkit/nsoutlineviewdatasource/outlineview(_:objectvaluefor:byitem:).md)
- [outlineView(_:pasteboardWriterForItem:)](appkit/nsoutlineviewdatasource/outlineview(_:pasteboardwriterforitem:).md)
- [outlineView(_:persistentObjectForItem:)](appkit/nsoutlineviewdatasource/outlineview(_:persistentobjectforitem:).md)
- [outlineView(_:setObjectValue:for:byItem:)](appkit/nsoutlineviewdatasource/outlineview(_:setobjectvalue:for:byitem:).md)
- [outlineView(_:sortDescriptorsDidChange:)](appkit/nsoutlineviewdatasource/outlineview(_:sortdescriptorsdidchange:).md)
- [outlineView(_:updateDraggingItemsForDrag:)](appkit/nsoutlineviewdatasource/outlineview(_:updatedraggingitemsfordrag:).md)
- [outlineView(_:validateDrop:proposedItem:proposedChildIndex:)](appkit/nsoutlineviewdatasource/outlineview(_:validatedrop:proposeditem:proposedchildindex:).md)
- [outlineView(_:writeItems:to:)](appkit/nsoutlineviewdatasource/outlineview(_:writeitems:to:).md)