再来做个小工具，简易计算器，用到了jfinal enjoy,140行代码不到
- 2019 年 10 月 11 日
- 筆記
要搭建好JDK8的环境，才能运行
import com.jfinal.kit.Kv import com.jfinal.template.Engine import javafx.scene.layout.GridPane import tornadofx.* import kotlin.Exception import kotlin.math.pow import kotlin.math.sqrt class EnjoyApp : App(EnjoyView::class, MyStyle::class) class EnjoyView : View("计算器") { val engine = Engine.use().setEncoding("utf-8") .setDevMode(true) private val kv = Kv.create() val strOut = stringProperty() val history = stringProperty("") val strIn = stringProperty("") var gp: GridPane by singleAssign() override val root = borderpane { paddingAll = 10.0 top = vbox(5) { hbox { label("式子：") textfield(strIn) { text = "1+1*8-789/654" } } hbox { label("结果：") textfield(strOut) { isEditable = false } } paddingBottom = 10.0 } center = hbox(10) { gp = gridpane { hgap = 2.0 vgap = 2.0 } textarea(history) { } } } init { val nums = listOf("%", "√", "x²", "1/x", ")", "C", "Del", "÷", "7", "8", "9", "*", "4", "5", "6", "-", "1", "2", "3", "+", "(", "0", ".", "=") var i = 0 (0..5).forEach { r -> (0..3).forEach { c -> gp.add(button("${nums[i]}") { setPrefSize(65.0, 65.0) action { when (text) { "=" -> { strOut.value = renderStr(strIn.value, kv) addHistory(text) } "Del" -> strIn.value = strIn.value.dropLast(1) "C" -> clear() "÷" -> strIn.value = strIn.value.plus("/") "√" -> { strOut.value = sqrt(renderStr(strIn.value, kv).toDouble()).toString() addHistory(text) } "x²" -> { strOut.value = (renderStr(strIn.value, kv).toDouble().pow(2)).toString() addHistory(text) } "1/x" -> { strOut.value = (renderStr(strIn.value, kv).toDouble().pow(-1)).toString() addHistory(text) } else -> strIn.value = strIn.value.plus(text) } } }, c, r) i++ } } } private fun addHistory(operator:String) { when(operator){ "="->{ if (!strOut.value.isNullOrEmpty()) history.value += strIn.value.plus("=").plus(strOut.value).plus("nn") } "1/x"->{ if (!strOut.value.isNullOrEmpty()) history.value +="1/(" +strIn.value.plus(")=").plus(strOut.value).plus("nn") } "x²"->{ if (!strOut.value.isNullOrEmpty()) history.value += "(" +strIn.value.plus(")²=").plus(strOut.value).plus("nn") } "√"->{ if (!strOut.value.isNullOrEmpty()) history.value +="sqrt(" + strIn.value.plus(")=").plus(strOut.value).plus("nn") } } clear() } private fun clear() { strOut.value = "" strIn.value = "" } private fun renderStr(inStr: String, kv: Kv): String { var result = "" if (inStr.isNotEmpty()) { try { result = engine.getTemplateByString("#($inStr)").renderToString(kv) } catch (e: Exception) { information("请输入正确的计算式子") } } else { result = "" } return result } } class MyStyle : Stylesheet() { init { s(label, textField, button) { fontSize = 20.px } } }
