Implemented saving generated QR code

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

@@ -1,16 +1,21 @@
 package net.codinux.banking.epcqrcode.windows.main
 
+import javafx.beans.property.SimpleBooleanProperty
 import javafx.beans.property.SimpleObjectProperty
 import javafx.beans.property.SimpleStringProperty
 import javafx.geometry.Pos
+import javafx.scene.control.Alert
 import javafx.scene.control.TextFormatter
 import javafx.scene.image.Image
-import net.codinux.banking.epcqrcode.*
+import javafx.scene.layout.Priority
+import javafx.stage.FileChooser
 import org.slf4j.LoggerFactory
 import tornadofx.*
 import java.io.ByteArrayInputStream
+import java.io.File
 import java.text.DecimalFormat
 import java.text.ParsePosition
+import net.codinux.banking.epcqrcode.*
 
 
 class MainWindow : View(FX.messages["application.title"]) {
@@ -35,9 +40,23 @@ class MainWindow : View(FX.messages["application.title"]) {
     private val reference = SimpleStringProperty("")
 
 
+    private val selectedDestinationFile = SimpleStringProperty("")
+
+    private val isDestinationFileSelected = SimpleBooleanProperty(false)
+
+
     private val qrCodeGenerator = QrCodeGenerator()
 
-    private val generatedQrCode = SimpleObjectProperty<Image>()
+    private val generatedQrCodeImage = SimpleObjectProperty<Image>()
+
+    private var generatedQrCodeBytes: ByteArray? = null // couldn't find no working way to get image bytes from image -> also saving pure bytes in memory (what a waste)
+
+
+    init {
+        selectedDestinationFile.addListener { _, _, newValue ->
+            isDestinationFileSelected.value = newValue.isNotBlank()
+        }
+    }
 
 
     override val root = vbox {
@@ -80,18 +99,69 @@ class MainWindow : View(FX.messages["application.title"]) {
                 }
             }
 
-            hbox(alignment = Pos.CENTER_RIGHT) {
+            hbox {
-                button(messages["Generate"]) {
+                textfield(selectedDestinationFile) {
-                    prefWidth = 200.0
+                    prefHeight = FieldHeight
+
+                    hboxConstraints {
+                        hGrow = Priority.ALWAYS
+
+                        marginRight = 8.0
+                    }
+                }
+
+                button("...") {
+                    prefWidth = 50.0
+                    prefHeight = FieldHeight
+
+                    action { selectDestinationFileAndSaveTo() }
+                }
+
+                vboxConstraints {
+                    marginBottom = 6.0
+                }
+            }
+
+            hbox {
+                useMaxWidth = true
+                isFillWidth = true
+
+                button(messages["generate"]) {
+                    useMaxWidth = true
                     minHeight = 36.0
 
                     action { generateQrCode() }
+
+                    hboxConstraints {
+                        hGrow = Priority.ALWAYS
+
+                        marginRight = 8.0
+                    }
+                }
+
+                button(messages["generate.and.save"]) {
+                    useMaxWidth = true
+                    minHeight = 36.0
+
+                    enableWhen(isDestinationFileSelected)
+
+                    action { generateAndSaveQrCode() }
+
+                    hboxConstraints {
+                        hGrow = Priority.ALWAYS
+                    }
                 }
             }
         }
 
         hbox(alignment = Pos.CENTER) {
-            imageview(generatedQrCode) {
+            imageview(generatedQrCodeImage) {
+                contextmenu {
+                    item(messages["save.to"]) {
+                        action { selectDestinationFileAndSaveTo() }
+                    }
+                }
+
                 hboxConstraints {
                     marginTop = 4.0
                 }
@@ -119,11 +189,50 @@ class MainWindow : View(FX.messages["application.title"]) {
     }
 
 
+    private fun selectDestinationFileAndSaveTo() {
+        val fileChooser = FileChooser()
+
+        if (isDestinationFileSelected.value) {
+            val file = File(selectedDestinationFile.value)
+            fileChooser.initialDirectory = file.parentFile
+            fileChooser.initialFileName = file.name
+        }
+
+        fileChooser.showSaveDialog(currentStage)?.let { selectedFile ->
+            selectedDestinationFile.value = selectedFile.absolutePath
+
+            saveGeneratedQrCodeTo(selectedFile)
+        }
+    }
+
+    private fun saveGeneratedQrCodeTo(selectedFile: File) {
+        generatedQrCodeBytes?.let { generatedQrCodeBytes ->
+            try {
+                selectedFile.writeBytes(generatedQrCodeBytes)
+            } catch (e: Exception) {
+                val alert = Alert(Alert.AlertType.ERROR)
+                alert.title = messages["Could not save QR code"]
+                alert.headerText = ""
+                alert.contentText = e.toString()
+                alert.show()
+            }
+        }
+    }
+
+
+    private fun generateAndSaveQrCode() {
+        generateQrCode()
+
+        if (isDestinationFileSelected.value) {
+            saveGeneratedQrCodeTo(File(selectedDestinationFile.value))
+        }
+    }
+
     private fun generateQrCode() {
         val param = CreatorParam(receiver.value, iban.value, bic.value, map(amount.value), reference.value)
         val qrCodeContent = EpcQrCodeCreator().generateAsString(param)
 
-        generatedQrCode.value = generateQrCode(qrCodeContent)
+        generatedQrCodeImage.value = generateQrCode(qrCodeContent)
 
         currentStage?.sizeToScene()
     }
@@ -134,9 +243,9 @@ class MainWindow : View(FX.messages["application.title"]) {
 
     private fun generateQrCode(informationToEncode: String): Image? {
         try {
-            val qrCodeBytes = qrCodeGenerator.generateQrCode(informationToEncode)
+            generatedQrCodeBytes = qrCodeGenerator.generateQrCode(informationToEncode)
 
-            return Image(ByteArrayInputStream(qrCodeBytes))
+            return Image(ByteArrayInputStream(generatedQrCodeBytes))
         } catch (e: Exception) {
             logger.error("Could not generate QR code for $informationToEncode", e)
         }

EpcQrCodeJavaFxApp/src/main/resources/Messages.properties

@@ -14,4 +14,8 @@ BIC=BIC
 Amount=Amount
 Reference=Reference
 
-Generate=Generate
+generate=Generate
+generate.and.save=Generate and save
+save.to=Save to ...
+
+alert.header.could.not.save.qr.code=Could not save QR code

EpcQrCodeJavaFxApp/src/main/resources/Messages_de.properties

@@ -14,4 +14,8 @@ BIC=BIC
 Amount=Betrag
 Reference=Verwendungszweck
 
-Generate=Erstellen
+generate=Erstellen
+generate.and.save=Erstellen und speichern
+save.to=Speichern unter...
+
+alert.header.could.not.save.qr.code=QR Code konnte nicht gespeichert werden