Dr2 1966 add ability to drag and drop files into text boxes

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, macos-13, windows-latest]
         jdk: [8, 11, 17]
     runs-on: ${{ matrix.os }}
     steps:

.gitignore

@@ -15,3 +15,6 @@ project/plugins/project/
 # IntelliJ specific
 .idea/*
 *.iml
+
+# MacOS specific
+**/.DS_Store

csv-validator-ui/src/main/scala/uk/gov/nationalarchives/csv/validator/ui/CsvValidatorUi.scala

@@ -18,21 +18,24 @@ import uk.gov.nationalarchives.csv.validator.ui.ScalaSwingHelpers._
 import uk.gov.nationalarchives.csv.validator.{EOL, FailMessage, ProgressCallback}
 
 import java.awt.Cursor
-import java.io.IOException
+import java.awt.datatransfer.DataFlavor
+import java.io.{File, IOException}
 import java.net.URL
 import java.nio.charset.Charset
 import java.nio.charset.StandardCharsets.UTF_8
 import java.nio.file.{Files, Path, Paths, StandardOpenOption}
+import java.util
 import java.util.Properties
 import java.util.jar.{Attributes, Manifest}
 import javax.swing._
 import javax.swing.filechooser.FileNameExtensionFilter
 import javax.swing.table.DefaultTableModel
+import scala.jdk.CollectionConverters.CollectionHasAsScala
 import scala.language.reflectiveCalls
 import scala.swing.GridBagPanel.Anchor
 import scala.swing.PopupMenuImplicits._
 import scala.swing._
-import scala.util.Using
+import scala.util.{Failure, Success, Try, Using}
 
 /**
  * Simple GUI for the CSV Validator
@@ -229,7 +232,39 @@ object CsvValidatorUi extends SimpleSwingApplication {
     private val layout = new DesignGridLayout(peer)
 
     private val lblCsvFile = new Label("CSV file:")
-    private val txtCsvFile = new TextField(30)
+    private val txtCsvFile = new JTextField(30)
+
+    final class FileDropHandler(fileExt: String, label: Label) extends TransferHandler {
+      override def canImport(support: TransferHandler.TransferSupport): Boolean = support.getDataFlavors.exists(_.isFlavorJavaFileListType)
+
+      @SuppressWarnings(Array("unchecked"))
+      override def importData(support: TransferHandler.TransferSupport): Boolean = {
+        if (!this.canImport(support)) false
+        else {
+          val potentialFiles = Try {
+            support.getTransferable.getTransferData(DataFlavor.javaFileListFlavor).asInstanceOf[util.List[File]].asScala.toList
+          }
+          potentialFiles match {
+            case Failure(ex) => false
+            case Success(files) =>
+              lazy val pathOfFirstFile = files.head.getAbsolutePath
+              if(files.length != 1) {
+                outputToReport(s"Error: Please drag only 1 file into the '${label.text}' text box.")
+                false
+              }
+              else if(!pathOfFirstFile.endsWith(fileExt)) {
+                outputToReport(s"Error: Please drag only '$fileExt' files into the '${label.text}' text box.")
+                false
+              }
+              else {
+                (if(fileExt == ".csv") txtCsvFile else txtCsvSchemaFile).setText(pathOfFirstFile)
+                true
+              }
+          }
+        }
+      }
+    }
+    txtCsvFile.setTransferHandler(new FileDropHandler(".csv", lblCsvFile))
     private val csvFileChooser = new FileChooser(loadSettings match {
       case Some(s) =>
         s.lastCsvPath.toFile
@@ -253,7 +288,8 @@ object CsvValidatorUi extends SimpleSwingApplication {
     }
 
     private val lblCsvSchemaFile = new Label("CSV Schema file:")
-    private val txtCsvSchemaFile = new TextField(30)
+    private val txtCsvSchemaFile = new JTextField(30)
+    txtCsvSchemaFile.setTransferHandler(new FileDropHandler(".csvs", lblCsvSchemaFile))
     private val csvSchemaFileChooser = new FileChooser(loadSettings match {
       case Some(s) =>
         s.lastCsvSchemaPath.toFile
@@ -322,9 +358,9 @@ object CsvValidatorUi extends SimpleSwingApplication {
       action = {
         txtArReport.text = ""
         CsvValidatorUi.this.validate(
-          txtCsvFile.text,
+          txtCsvFile.getText,
           settingsPanel.csvEncoding,
-          txtCsvSchemaFile.text,
+          txtCsvSchemaFile.getText,
           settingsPanel.csvSchemaEncoding,
           settingsPanel.failOnFirstError,
           settingsPanel.pathSubstitutions,

csv-validator-ui/src/main/scala/uk/gov/nationalarchives/csv/validator/ui/ScalaSwingHelpers.scala

@@ -16,6 +16,7 @@ import java.beans.{PropertyChangeEvent, PropertyChangeListener}
 import java.nio.file.Path
 import scala.swing.Dialog.Message
 import java.io.IOException
+import javax.swing.JTextField
 
 /**
  * Some simple helpers to ease
@@ -30,8 +31,8 @@ object ScalaSwingHelpers {
    * @param output A text component which displays the absolute path of the chosen file
    * @param locateOver A component over which the FileChooser dialog should be located
    */
-  def chooseFile(fileChooser: FileChooser, output: TextComponent, locateOver: Component) : Unit = {
-    chooseFile(fileChooser, {f => output.text = f.toAbsolutePath.toString; None}, locateOver)
+  def chooseFile(fileChooser: FileChooser, output: JTextField, locateOver: Component) : Unit = {
+    chooseFile(fileChooser, {f => output.setText(f.toAbsolutePath.toString); None}, locateOver)
   }
 
   /**