Implemented generating QR code automatically if Enter or Tab is pressed and required data is entered

EpcQrCodeJavaFxApp/src/main/kotlin/net/codinux/banking/epcqrcode/windows/main/MainWindow.kt

@@ -7,6 +7,8 @@ import javafx.geometry.Pos
 import javafx.scene.control.Alert
 import javafx.scene.control.TextFormatter
 import javafx.scene.image.Image
+import javafx.scene.input.KeyCode
+import javafx.scene.input.KeyEvent
 import javafx.scene.layout.Priority
 import javafx.stage.FileChooser
 import org.slf4j.LoggerFactory
@@ -75,18 +77,24 @@ class MainWindow : View(FX.messages["application.title"]) {
                 field(messages["Receiver"]) {
                     textfield(receiver) {
                         prefHeight = FieldHeight
+
+                        setOnKeyPressed { handleTextFieldKeyPressed(it) }
                     }
                 }
 
                 field(messages["IBAN"]) {
                     textfield(iban) {
                         prefHeight = FieldHeight
+
+                        setOnKeyPressed { handleTextFieldKeyPressed(it) }
                     }
                 }
 
                 field(messages["BIC"]) {
                     textfield(bic) {
                         prefHeight = FieldHeight
+
+                        setOnKeyPressed { handleTextFieldKeyPressed(it) }
                     }
                 }
 
@@ -97,12 +105,16 @@ class MainWindow : View(FX.messages["application.title"]) {
                         setTextFormatter(TextFormatter<String> { change ->
                             isDecimalNumberEntered(change)
                         })
+
+                        setOnKeyPressed { handleTextFieldKeyPressed(it) }
                     }
                 }
 
                 field(messages["Reference"]) {
                     textfield(reference) {
                         prefHeight = FieldHeight
+
+                        setOnKeyPressed { handleTextFieldKeyPressed(it) }
                     }
                 }
             }
@@ -196,6 +208,22 @@ class MainWindow : View(FX.messages["application.title"]) {
         }
     }
 
+    private fun handleTextFieldKeyPressed(event: KeyEvent) {
+        if (event.code == KeyCode.ENTER || event.code == KeyCode.TAB) {
+            if (haveRequiredDataBeenEntered()) {
+                generateQrCode()
+            }
+        }
+    }
+
+    private fun haveRequiredDataBeenEntered(): Boolean {
+        return receiver.value.isNotBlank()
+                && iban.value.isNotBlank() // TODO: also check if it's a valid IBAN
+                // TODO: check if either no BIC or a valid BIC is entered
+                && amount.value.isNotBlank()
+                && reference.value.isNotBlank()
+    }
+
 
     private fun selectDestinationFileAndSaveTo() {
         val fileChooser = FileChooser()