ScalaFX 8将节点拖放到另一个节点中

我需要将一个矩形节点拖动到另一个节点中。ScalaFX应该基于JavaFX，所以这应该是类似的，对吗？由于ScalaFX文档不多，我试图找到一些JavaFX示例，我读了很多，但没有一个适合我：(

据我所知，应该有3种类型的拖放操作：

• 在单个节点上进行简单的拖放
• 完全拖放（我应该使用这个来在节点之间进行交互）
• 在应用程序之间拖放文件和数据

最后我上了一堂简单的课：

class GameBoardRectangle(val coordinates: Coordinates) extends Rectangle
  {
    width = 32
    height = 32
    stroke = Color.BLACK

    var dragDelta: Point2D = new Point2D(0,0)

    onMousePressed = new EventHandler[input.MouseEvent] {
      override def handle(event: input.MouseEvent): Unit = {
        dragDelta = new Point2D(layoutX.toDouble - event.getSceneX,
          layoutY.toDouble - event.getSceneY)
          //event.setDragDetect(true)
          rect.setMouseTransparent(true)
      }
    }

    onMouseDragged = new EventHandler[input.MouseEvent] {
      override def handle(event: input.MouseEvent): Unit = {
        layoutX = event.getSceneX + dragDelta.x
        layoutY = event.getSceneY + dragDelta.y
       // println("OnMouseDragged")
        rect.setMouseTransparent(true)
        event.consume()
      }
    }

    val rect = this

    onDragDetected = new EventHandler[MouseEvent] {
      override def handle(event: MouseEvent): Unit = {
       // var db: Dragboard = rect.startDragAndDrop(TransferMode.LINK)
        var clibpoard = new ClipboardContent()
        //event.

        println("OnDragDetected")
        rect.startFullDrag()
      //  event.consume()
      }
    }

    onMouseDragEntered = new EventHandler[MouseDragEvent] {
      override def handle(event: MouseDragEvent): Unit = {
        println("onMouseDragEntered")
      }
    }

    onMouseDragExited = new EventHandler[MouseDragEvent] {
      override def handle(event: MouseDragEvent): Unit = {
        println("onMouseDragExited")
      }
    }

    onMouseDragOver = new EventHandler[MouseDragEvent] {
      override def handle(event: MouseDragEvent): Unit = {
        println("onMouseDragExited")

      }
    }

    onMouseDragReleased = new EventHandler[MouseDragEvent] {
      override def handle(event: MouseDragEvent): Unit = {
        println ("onMouseDragReleased")
      }
    }

    onDragDropped = new EventHandler[DragEvent] {
      override def handle(event: DragEvent): Unit = {
        println("OnDragDropped")
      }
    }

    onDragDone = new EventHandler[DragEvent] {
      override def handle(event: DragEvent): Unit = {
        println("OnDragDone")
      }
    }

    onDragOver = new EventHandler[DragEvent] {
      override def handle(event: DragEvent): Unit = {
        println("OnDragOver")
        //event.acceptTransferModes(TransferMode.LINK)
      }
    }

    onDragEntered = new EventHandler[DragEvent] {
      override def handle(event: DragEvent): Unit = {
        event.acceptTransferModes(TransferMode.LINK)
        println("OnDragEnetered")
      }
    }
  }

将一个节点拖到另一个节点上后从控制台输出：

OnDragDetected
onMouseDragEntered
onMouseDragExited

没有激发OnDragOver方法

我遗漏了什么？我对拖放事件的数量非常困惑