tornadofx.ErrorHandler.kt Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of fx Show documentation

Lightweight JavaFX Framework for Kotlin

The newest version!

package tornadofx

import javafx.application.Platform
import javafx.scene.control.Alert
import javafx.scene.control.Alert.AlertType.ERROR
import javafx.scene.control.Label
import javafx.scene.control.TextArea
import javafx.scene.layout.VBox

import java.io.ByteArrayOutputStream
import java.io.PrintWriter

class DefaultErrorHandler : Thread.UncaughtExceptionHandler {
    override fun uncaughtException(t: Thread, error: Throwable) {
        Platform.runLater {
            val cause = Label(if (error.cause != null) error.cause?.message else "").apply {
                style = "-fx-font-weight: bold"
            }

            val textarea = TextArea().apply {
                prefRowCount = 20
                prefColumnCount = 50
                text = stringFromError(error)
            }

            Alert(ERROR).apply {
                title = error.message ?: "An error occured"
                isResizable = true
                headerText = "Error in " + error.stackTrace[0].toString()
                dialogPane.content = VBox(cause, textarea)
                showAndWait()
            }
        }
    }

}

private fun stringFromError(e: Throwable): String {
    val out = ByteArrayOutputStream()
    val writer = PrintWriter(out)
    e.printStackTrace(writer)
    writer.close()
    return out.toString()
}