ScalaFx:具有一级函数的事件处理程序 [英] ScalaFx: Event Handler with First Class Function
问题描述
import scalafx.scene.control.ListView
import javafx.scene.input.MouseEvent
import javafx.event.EventHandler
...
val list = new ListView [String] {
onMouseClicked = new EventHandler [MouseEvent] {
覆盖def句柄(事件:MouseEvent){
doSomething(event)
}
}
}
但这似乎是非常Java样式的样板代码。有没有办法使用这样的第一类函数?
onMouseClicked =(event:MouseEvent)=> doSomething(event)
编译器说:
javafx.scene.input.MouseEvent => scalafx.delegate.SFXDelegate(javafx.scene.input.MouseEvent)与javafx.scene.input.MouseEvent可用的隐式视图。
当您使用ScalaFX时,您需要记住使用:
import scalafx.Includes._
这将解决您的错误。有很多使用事件处理程序ScalaFX方式的例子,例如:
i try to write an event handler in a scalaFx app. I found followin solution:
import scalafx.scene.control.ListView
import javafx.scene.input.MouseEvent
import javafx.event.EventHandler
...
val list = new ListView[String] {
onMouseClicked = new EventHandler[MouseEvent] {
override def handle(event: MouseEvent) {
doSomething(event)
}
}
}
But this seems to be very Java-style boilerplate code. Is there a way to do this with a first class function like this?
onMouseClicked = (event: MouseEvent) => doSomething(event)
Compiler says:
No implicit view available from javafx.scene.input.MouseEvent => scalafx.delegate.SFXDelegate[javafx.scene.input.MouseEvent] with javafx.scene.input.MouseEvent.
When you work with ScalaFX you always need to remember to use:
import scalafx.Includes._
This will resolve the error you have. There are many examples of using event handlers the ScalaFX way, for instance here:
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