Instance Method

prepareForDragOperation(_:)

Invoked when the image is released, allowing the receiver to agree to or refuse drag operation.

Declaration

optional func prepareForDragOperation(_ sender: NSDraggingInfo) -> Bool

Parameters

sender

The object sending the message; use it to get details about the dragging operation.

Return Value

true if the receiver agrees to perform the drag operation and false if not.

Discussion

This method is invoked only if the most recent draggingEntered(_:) or draggingUpdated(_:) message returned an acceptable drag-operation value.

If you want the drag items to animate from their current location on screen to their final location in your view, set the sender object’s animatesToDestination property to true in your implementation of this method.

See Also

Managing a Dragging Session After an Image Is Released

func performDragOperation(NSDraggingInfo) -> Bool

Invoked after the released image has been removed from the screen, signaling the receiver to import the pasteboard data.

func concludeDragOperation(NSDraggingInfo?)

Invoked when the dragging operation is complete, signaling the receiver to perform any necessary clean-up.