DragAndDrop.visualMode

Визуальная индикация сопротивления.

По умолчанию DragAndDropVisualMode.Link.

using UnityEngine;
using UnityEditor;

public class Example : MonoBehaviour
{
    void OnGUI()
    {
        EventType 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();
        }
    }
}