Version: 2017.1
public static DragAndDropVisualMode visualMode ;

Description

Визуальная индикация перетаскивания.

По умолчанию DragAndDropVisualMode.Link.

    function OnGUI ()
    {
        var eventType = Event.current.type;
        if (eventType == EventType.DragUpdated || eventType == EventType.DragPerform)
        {
            // Show a copy icon on the drag
            DragAndDrop.visualMode = DragAndDropVisualMode.Copy;

if (eventType == EventType.DragPerform) DragAndDrop.AcceptDrag();

Event.current.Use(); } }