[英]Are the children of a ScalaFX Pane of JavaFX type?
I am quite new to Scala and ScalaFX, so I probably do not understand this correctly. 我对Scala和ScalaFX非常陌生,因此我可能无法正确理解。 My issue: I add a node (fe Button) to a ScalaFX Pane (fe VBox).
我的问题:我向ScalaFX窗格(fe VBox)中添加了一个节点(fe Button)。 When I access the children of the Pane the children type changed from ScalaFX Button to JavaFX Button.
当我访问窗格的子级时,子级类型从ScalaFX Button更改为JavaFX Button。
When I have a look at the source code of ScalaFX I can see that everything is done with delegates. 当我查看ScalaFX的源代码时,我可以看到一切都由委托完成。 So is the ScalaFX node lost?
那么ScalaFX节点丢失了吗? I think there is done some magic (for me as a newbie) with implicit conversion from ScalaFX to JavaFX.
我认为通过从ScalaFX到JavaFX的隐式转换,已经做了一些魔术(对我而言,是一个新手)。 Is it possible to do an implicit conversion the other way round?
是否可以反过来进行隐式转换? Do I use ScalaFX correctly?
我可以正确使用ScalaFX吗?
I wanted to go through all children of a Pane. 我想浏览窗格的所有子项。 When a child is from special type I wanted to perform some operations with this child.
当一个孩子来自特殊类型时,我想对该孩子执行一些操作。 Now I would have to check for JavaFX type and work on a JavaFX node, which does not appears like clean code to me.
现在,我必须检查JavaFX类型并在JavaFX节点上工作,这对我而言似乎不是干净的代码。
Any commments welcome. 任何感激欢迎。 Thanks in advance.
提前致谢。
I attached a running example. 我附上了一个正在运行的例子。
import scalafx.Includes._
import scalafx.application.JFXApp
import scalafx.application.JFXApp.PrimaryStage
import scalafx.scene.Scene
import scalafx.scene.control.Button
import scalafx.scene.layout.VBox
import scalafx.stage.WindowEvent
object TestChildren extends JFXApp {
stage = new PrimaryStage {
val contentPane = new VBox()
val b1 = new Button("B1")
contentPane.children.add(b1)
scene = new Scene (contentPane)
println(b1.getClass)
println("--")
for (child <- contentPane.children) {
println(child.getClass)
}
}
}
Yes, there is an implicit conversion. 是的,有一个隐式转换。 I do not know which IDE you are using, but for example IntelliJ 14.1 with the Scala plugin indicates implicit conversions, which is a really useful feature.
我不知道您使用的是哪个IDE,但是例如带有Scala插件的IntelliJ 14.1表示隐式转换,这是一个非常有用的功能。
In your case, 就你而言
contentPane.children.add(b1)
is the line where the implicit conversion happens. 是发生隐式转换的行。 The explicit form is
显式形式为
contentPane.children.add(Button.sfxButton2jfx(b1))
where the implicit conversion is a one-liner in scalafx.scene.control.Button
: 其中
scalafx.scene.control.Button
中的隐式转换是scalafx.scene.control.Button
:
implicit def sfxButton2jfx(v: Button): jfxsc.Button = if (v != null) v.delegate else null
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