<!--
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  "title" : "NSDraggingSource"
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# NSDraggingSource

A set of methods that are implemented by the source object in a dragging session.

```
protocol NSDraggingSource : NSObjectProtocol
```

## Overview

In macOS 10.7 and later `NSDraggingSource` is now a formal protocol and has an updated interface. The OS X v10.6 behavior has been retained, but will be dropped in a future version of the operating system. The methods that are to be deprecated are marked as such.

## Topics

### Dragging Session Operation

[`draggingSession(_:sourceOperationMaskFor:)`](/documentation/AppKit/NSDraggingSource/draggingSession(_:sourceOperationMaskFor:))

Declares the types of operations the source allows to be performed.

### Dragging Session Locations

[`draggingSession(_:willBeginAt:)`](/documentation/AppKit/NSDraggingSource/draggingSession(_:willBeginAt:))

Invoked when the drag will begin.

[`draggingSession(_:movedTo:)`](/documentation/AppKit/NSDraggingSource/draggingSession(_:movedTo:))

Invoked when the drag moves on the screen.

[`draggingSession(_:endedAt:operation:)`](/documentation/AppKit/NSDraggingSource/draggingSession(_:endedAt:operation:))

Invoked when the dragging session has completed.

### Dragging Session Modifier Keys

[`ignoreModifierKeys(for:)`](/documentation/AppKit/NSDraggingSource/ignoreModifierKeys(for:))

Returns whether the modifier keys will be ignored for this dragging session.

### Dragging Options

  <doc://com.apple.documentation/documentation/ObjectiveC/NSObject-swift.class/namesOfPromisedFilesDropped(atDestination:)>

## See Also

[Drag and Drop](/documentation/AppKit/drag-and-drop)

Support the direct manipulation of your app’s content using drag and drop.


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