scala 带有替代方法的重载方法值
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Overloaded method value with alternatives
提问by Rob
I have the following:
我有以下几点：
def calc(dir: File): Option[Group] = {
calcModel(dir) match {
case Some(model: Model) => calcUI(model, centerpane.getWidth, centerpane.getHeight, 5, MAX_LEVEL)
case None => None
}
}
def calcUI(model: Model, availableWidth: Double, availableHeight: Double, maxLevel: Int): Option[Group] = {
}
def calcUI(model: Model, posX: Double, posY: Double, availableWidth: Double, availableHeight: Double, horizontally: Boolean, startLevel: Int, maxLevel: Int): Option[Group] = {
}
protected def calcUI(node: Node, posX: Double, posY: Double, availableWidth: Double, availableHeight: Double, horizontally: Boolean, level: Int, maxLevel: Int): Group = {
}
def calcModel(dir: File): Option[Model] = {
}
(Remark: Model does NOT derive from Node)
（备注：模型不是从节点派生的）
and get the following compiler error message:
并获得以下编译器错误消息：
Error:(88, 27) overloaded method value calcUI with alternatives:
(node: org.rob.spaceview.modell.Node,posX: Double,posY: Double,availableWidth: Double,availableHeight: Double,horizontally: Boolean,level: Int,maxLevel: Int)javafx.scene.Group <and>
(model: org.rob.spaceview.modell.Model,posX: Double,posY: Double,availableWidth: Double,availableHeight: Double,horizontally: Boolean,startLevel: Int,maxLevel: Int)Option[javafx.scene.Group] <and>
(model: org.rob.spaceview.modell.Model,availableWidth: Double,availableHeight: Double,maxLevel: Int)Option[javafx.scene.Group]
cannot be applied to (org.rob.spaceview.modell.Model, Double, Double, Int, Int)
case Some(model) => calcUI(model, centerpane.getWidth, centerpane.getHeight, 5, MAX_LEVEL)
^
I do not get it. All calcUI functions are different by parameters.
我不明白这一点。所有 calcUI 函数都因参数而异。
I know this error and most of the time I get it and fix it. But here, no clue.
我知道这个错误，而且大部分时间我都会得到它并修复它。但在这里，没有线索。
Hopefully somebody enlights me. Thanks.
希望有人启发我。谢谢。
采纳答案by Lomig Mégard
Actually, the given parameters in the call
实际上，调用中的给定参数
case Some(model) => calcUI(model, centerpane.getWidth, centerpane.getHeight, 5, MAX_LEVEL)
don't correspond to any defined calcUImethod. For example for the following definition
不对应于任何定义的calcUI方法。例如对于以下定义
def calcUI(model: Model, availableWidth: Double, availableHeight: Double, maxLevel: Int): Option[Group]
you have one more argument than needed.
你有一个比需要的更多的论据。
