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我正在努力將用java編寫的簡單JavaFX calc轉換爲Kotlin代碼。 https://gist.github.com/jewelsea/4344564 - > java源碼。從Java到Kotlin
其中我這個在科特林翻譯：
import Model.Math
import javafx.application.Application
import javafx.beans.binding.Bindings
import javafx.beans.property.*
import javafx.event.ActionEvent
import javafx.event.EventHandler
import javafx.geometry.Pos
import javafx.scene.Scene
import javafx.scene.control.*
import javafx.scene.input.KeyEvent
import javafx.scene.layout.*
import javafx.stage.Stage
import javafx.stage.StageStyle
import java.util.HashMap
// A simple Kotlin, JavaFX application
class KotlinCode : Application() {
private val accelerators = HashMap<String, Button>()
private val stackValue = SimpleDoubleProperty()
private val value = SimpleDoubleProperty()
enum class Op {
NOOP, ADD, SUBTRACT, MULTIPLY, DIVIDE
}
private var curOp = Op.NOOP
private var stackOp = Op.NOOP
private val template = arrayOf(arrayOf("7", "8", "9", "/"), arrayOf("4", "5", "6", "*"), arrayOf("1", "2", "3", "-"), arrayOf("0", "c", "=", "+"))
override fun start(stage: Stage) {
val screen = createScreen()
val buttons = createButtons()
stage.title = "Calc"
stage.initStyle(StageStyle.UTILITY)
stage.isResizable = false
stage.scene = Scene(createLayout(screen, buttons))
stage.show()
}
private fun createLayout(screen: TextField, buttons: TilePane): VBox {
val layout = VBox(20.0)
layout.alignment = Pos.CENTER
layout.style = "-fx-background-color: chocolate; -fx-padding: 20; -fx-font-size: 20;"
layout.children.setAll(screen, buttons)
handleAccelerators(layout)
screen.prefWidthProperty().bind(buttons.widthProperty())
return layout
}
private fun handleAccelerators(layout: VBox) {
layout.addEventFilter(KeyEvent.KEY_PRESSED) { keyEvent ->
val activated = accelerators[keyEvent.text]
activated?.fire()
}
}
private fun createScreen(): TextField {
val screen = TextField()
screen.style = "-fx-background-color: aquamarine;"
screen.alignment = Pos.CENTER_RIGHT
screen.isEditable = false
screen.textProperty().bind(Bindings.format("%.0f", value))
return screen
}
private fun createButtons(): TilePane {
val buttons = TilePane()
buttons.vgap = 7.0
buttons.hgap = 7.0
buttons.prefColumns = template[0].size
for (r in template) {
for (s in r) {
buttons.children.add(createButton(s))
}
}
return buttons
}
private fun createButton(s: String): Button {
val button = makeStandardButton(s)
if (s.matches("[0-9]".toRegex())) {
makeNumericButton(s, button)
//this.javaCode.makeNumericButton(s, button, curOp, value, stackValue, stackOp)
} else {
val triggerOp = determineOperand(s)
if (triggerOp.get() != Op.NOOP) {
//this.javaCode.makeOperandButton(button, triggerOp, this.curOp)
makeOperandButton(button, triggerOp)
} else if ("c" == s) {
//this.javaCode.makeClearButton(button, value)
makeClearButton(button)
} else if ("=" == s) {
makeEqualsButton(button)
}
}
return button
}
private fun determineOperand(s: String): ObjectProperty<Op> {
val triggerOp = SimpleObjectProperty(Op.NOOP)
when (s) {
"+" -> triggerOp.set(Op.ADD)
"-" -> triggerOp.set(Op.SUBTRACT)
"*" -> triggerOp.set(Op.MULTIPLY)
"/" -> triggerOp.set(Op.DIVIDE)
}
return triggerOp
}
private fun makeStandardButton(s: String): Button {
val button = Button(s)
button.style = "-fx-base: beige;"
accelerators.put(s, button)
button.setMaxSize(java.lang.Double.MAX_VALUE, java.lang.Double.MAX_VALUE)
return button
}
private fun makeEqualsButton(button: Button) {
button.style = "-fx-base: ghostwhite;"
button.setOnAction { actionEvent ->
// On instancie notre objet Kotlin
val math = Math()
when (stackOp) {
Op.NOOP -> {
}
Op.ADD -> value.set(math.adition(stackValue.get(), value.get()))
Op.SUBTRACT -> value.set(math.substraction(stackValue.get(), value.get()))
Op.MULTIPLY -> value.set(math.multiplication(stackValue.get(), value.get()))
Op.DIVIDE -> value.set(math.division(stackValue.get(), value.get()))
}
}
}
private fun makeOperandButton(button: Button, triggerOp: ObjectProperty<Op>) {
button.onAction = EventHandler {
fun handle(actionEvent: ActionEvent) {
curOp = triggerOp.get()
}
}
}
private fun makeNumericButton(s: String, button: Button) {
button.onAction = EventHandler {
fun handle(actionEvent: ActionEvent) {
if (curOp == Op.NOOP) {
value.set(value.get() * 10 + Integer.parseInt(s))
} else {
stackValue.set(value.get())
value.set(java.lang.Double.parseDouble(s))
stackOp = curOp
curOp = Op.NOOP
}
}
}
}
private fun makeClearButton(button: Button) {
button.onAction = EventHandler {
fun handle(actionEvent: ActionEvent) {
value.set(0.0)
}
}
}
companion object {
@JvmStatic
fun main(args: Array<String>) {
launch(KotlinCode::class.java)
}
}
}
現在計算的啓動，但沒有綁定到按鈕操作。任何人都有線索？
我的猜測是，在makeOperandButton，makeNumericButton和makeClearButton手柄功能永遠不會觸發。但我不明白爲什麼。
非常感謝，祝您有美好的一天！