| dragInstanceId | ID of the dragged asset that is dropped into the Project browser window. |
| dropUponPath | Path of the dragged asset that is dropped into the Project browser window. |
| perform | True if the event is of type EventType.DragPerform. |
DragAndDropVisualMode Returns DragAndDropVisualMode.None if this handler is not able to process the event. In that case a new handler will be called for processing. Any other DragAndDropVisualMode results will stop the handler chain.
Handler for the Project.