Data commit

Task/GUI-component-interaction/Scala/gui-component-interaction.scala

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+import scala.swing._
+import scala.swing.Swing._
+import scala.swing.event._
+
+object Interact extends SimpleSwingApplication {
+  def top = new MainFrame {
+    title = "Rosetta Code >>> Task: component interaction | Language: Scala"
+
+    val numberField = new TextField {
+      text = "0" // start at 0
+      horizontalAlignment = Alignment.Right
+    }
+
+    val incButton = new Button { text = "Increment" }
+    val randButton = new Button { text = "Random" }
+
+    // arrange buttons in a grid with 1 row, 2 columns
+    val buttonPanel = new GridPanel(1, 2) {
+      contents ++= List(incButton, randButton)
+    }
+
+    // arrange text field and button panel in a grid with 2 row, 1 column
+    contents = new GridPanel(2, 1) { contents ++= List(numberField, buttonPanel) }
+
+    // listen for keys pressed in numberField and button clicks
+    listenTo(numberField.keys, incButton, randButton)
+    reactions += {
+      case kt: KeyTyped if (!kt.char.isDigit) => // if the entered char isn't a digit …
+        kt.consume // … eat the event (i.e. stop it from being processed)
+      case ButtonClicked(`incButton`) =>
+        if (numberField.text.isEmpty) numberField.text = "0"
+        // we use BigInt to avoid long overflow/number format exception
+        numberField.text = (BigInt(numberField.text) + 1).toString
+      case ButtonClicked(`randButton`) =>
+        import Dialog._
+        numberField.text = showOptions(buttonPanel, message = "Are you sure?",
+          title = "Choose an option!", entries = List("Yes", "No", "Cancel"),
+          initial = 2) match {
+            case Result.Yes => (Long.MaxValue * math.random).toLong.toString
+            case _          => numberField.text
+          }
+    }
+    centerOnScreen()
+  }
+}