我有一个包含一些信息的主窗口。我无法通过计时器启动警报。我需要每隔10秒显示一次警报(使用工作主窗口),然后通过警报按钮更改主窗口中标签的文本。 我有这段代码,但它不起作用:
object main extends JFXApp {
stage = new JFXApp.PrimaryStage() {
scene = new Scene {
val MyLabel = new Label("SomeText")
root = new VBox {
children = MyLabel
}
}
val ButtonTypeOne = new ButtonType("Change the text")
val ButtonTypeTwo = new ButtonType("No")
val alert1 = new Alert(AlertType.Warning) {
initOwner(stage)
title = "Warning!!!"
headerText = "Header"
contentText = "Do you need to change the text?"
buttonTypes = Seq(ButtonTypeOne, ButtonTypeTwo, ButtonType.Cancel)
}
val result = alert1.showAndWait()
val timerA = new PauseTransition(Duration(5000))
timerA.onFinished = { _ =>
result match {
case Some(ButtonTypeOne) => /*Here I need to change text in MyLabel */
case Some(ButtonTypeTwo) => None
case _ => None
}
timerA.playFromStart()
}
timerA.play
}
}
答案 0 :(得分:1)
您的代码中存在一些不同的问题:
val result = alert1.showAndWait
, JavaFX 也会在此类例程中调用showAndWait
非法。解决方案是为onHidden
创建一个alert1
事件处理程序,它会对其进行响应。然后,用于关闭对话框的按钮类型存储在alert1.result
中,因此您可以使用它来确定要采取的操作。
我添加了StringProperty
来帮助更改标签值。以下示例应该是您想要实现的目标的良好起点......
import scalafx.Includes._
import scalafx.animation.PauseTransition
import scalafx.application.JFXApp
import scalafx.application.JFXApp.PrimaryStage
import scalafx.beans.property.StringProperty
import scalafx.scene.Scene
import scalafx.scene.layout.VBox
import scalafx.scene.control.{Alert, ButtonType, Label}
import scalafx.scene.control.Alert.AlertType
import scalafx.util.Duration
object main extends JFXApp {
// String property for the text in myLabel.
val strProp = StringProperty("Some Text")
// Declare this so that it's accessible from timerA.onFinished.
val myLabel = new Label {
// Bind the text property to the value of strProp.
// When strProp's value changes, so does the label's text.
text <== strProp
}
stage = new PrimaryStage() {
scene = new Scene {
root = new VBox {
children = myLabel
}
}
}
// Custom buttons.
val ButtonTypeOne = new ButtonType("Change the text")
val ButtonTypeTwo = new ButtonType("No")
// Create the timer. This goes off after 5,000ms (5 seconds) - after play is called.
val timerA = new PauseTransition(Duration(5000))
// Alert dialog.
// Note: JavaFX forbids use of showAndWait within animation processing, so we must use
// an onHidden event instead.
val alert1 = new Alert(AlertType.Warning) {
initOwner(stage)
title = "Warning!!!"
headerText = "Header"
contentText = "Do you need to change the text?"
buttonTypes = Seq(ButtonTypeOne, ButtonTypeTwo, ButtonType.Cancel)
}
// React to the dialog being closed.
alert1.onHidden = {_ =>
alert1.result.value match {
// If button type one, change the property value.
// Note alert1.result.value is a JavaFX ButtonType, so use .delegate for the match.
case ButtonTypeOne.delegate => strProp.value = "Changed!"
// Otherwise, do nothing.
case _ =>
}
// Start the timer once more.
// This is going to be a very annoying app! ;-)
timerA.playFromStart()
}
// When the timer goes off, show the alert.
timerA.onFinished = {_ =>
alert1.show()
}
// Start the timer for the first time.
timerA.play
}