Add images to comments editor

src/main/java/org/jabref/gui/ClipBoardManager.java

@@ -5,8 +5,10 @@
 import java.awt.datatransfer.StringSelection;
 import java.awt.datatransfer.Transferable;
 import java.awt.datatransfer.UnsupportedFlavorException;
+import java.io.File;
 import java.io.IOException;
 import java.util.List;
+import java.util.Set;
 
 import javafx.application.Platform;
 import javafx.scene.control.TextInputControl;
@@ -94,10 +96,22 @@ public static String getHtmlContents() {
         return result;
     }
 
+    public static List<File> getFiles() {
+        return clipboard.getFiles();
+    }
+
     public static boolean hasHtml() {
         return clipboard.hasHtml();
     }
 
+    public static boolean hasFiles() {
+        return clipboard.hasFiles();
+    }
+
+    public static Set<DataFormat> getTypes() {
+        return clipboard.getContentTypes();
+    }
+
     /**
      * Get the String residing on the primary clipboard (if it exists).
      *

src/main/java/org/jabref/gui/fieldeditors/FieldEditors.java

@@ -111,7 +111,7 @@ public static FieldEditorFX getForField(final Field field,
         } else if (field == InternalField.KEY_FIELD) {
             return new CitationKeyEditor(field, suggestionProvider, fieldCheckers, databaseContext, undoAction, redoAction);
         } else if (fieldProperties.contains(FieldProperty.MARKDOWN)) {
-            return new MarkdownEditor(field, suggestionProvider, fieldCheckers, preferences, undoManager, undoAction, redoAction);
+            return new MarkdownEditor(field, suggestionProvider, fieldCheckers, preferences, undoManager, undoAction, redoAction, databaseContext);
         } else {
             // There was no specific editor found
 

src/main/java/org/jabref/gui/fieldeditors/MarkdownEditor.java

@@ -1,5 +1,8 @@
 package org.jabref.gui.fieldeditors;
 
+import java.io.File;
+import java.util.List;
+
 import javax.swing.undo.UndoManager;
 
 import javafx.scene.control.TextInputControl;
@@ -10,15 +13,56 @@
 import org.jabref.gui.undo.RedoAction;
 import org.jabref.gui.undo.UndoAction;
 import org.jabref.logic.integrity.FieldCheckers;
+import org.jabref.model.database.BibDatabaseContext;
 import org.jabref.model.entry.field.Field;
 
 import com.vladsch.flexmark.html2md.converter.FlexmarkHtmlConverter;
 
 public class MarkdownEditor extends SimpleEditor {
     private final FlexmarkHtmlConverter flexmarkHtmlConverter = FlexmarkHtmlConverter.builder().build();
 
-    public MarkdownEditor(Field field, SuggestionProvider<?> suggestionProvider, FieldCheckers fieldCheckers, GuiPreferences preferences, UndoManager undoManager, UndoAction undoAction, RedoAction redoAction) {
+    private final BibDatabaseContext databaseContext;
+
+    public MarkdownEditor(Field field,
+                          SuggestionProvider<?> suggestionProvider,
+                          FieldCheckers fieldCheckers,
+                          GuiPreferences preferences,
+                          UndoManager undoManager,
+                          UndoAction undoAction,
+                          RedoAction redoAction,
+                          BibDatabaseContext databaseContext) {
         super(field, suggestionProvider, fieldCheckers, preferences, true, undoManager, undoAction, redoAction);
+
+        this.databaseContext = databaseContext;
+
+        this.setOnDragDropped(event -> {
+            boolean success = false;
+            if (event.getDragboard().hasFiles()) {
+                String mdText = imageToMdText(event.getDragboard().getFiles());
+
+                this.insertTextFromDragInput(event.getX(), event.getY(), mdText);
+
+                success = true;
+            }
+            event.setDropCompleted(success);
+            event.consume();
+        });
+    }
+
+    private String imageToMdText(List<File> files) {
+        String mdImageTemplate = "![%s](file://%s)\n";
+        StringBuilder allImagesText = new StringBuilder();
+
+        // With this you can get the path to the default directory
+        if (databaseContext.getMetaData().getDefaultFileDirectory().isPresent()) {
+            databaseContext.getMetaData().getDefaultFileDirectory().get();
+        }
+
+        for (File file: files) {
+            allImagesText.append(mdImageTemplate.formatted(file.getName(), file.getAbsolutePath()));
+        }
+
+        return allImagesText.toString();
     }
 
     @Override
@@ -29,6 +73,12 @@ public void paste() {
                 if (ClipBoardManager.hasHtml()) {
                     String htmlText = ClipBoardManager.getHtmlContents();
                     String mdText = flexmarkHtmlConverter.convert(htmlText);
+                    super.replaceSelection(mdText);
+                } else if (ClipBoardManager.hasFiles()) {
+                    List<File> files = ClipBoardManager.getFiles();
+
+                    String mdText = imageToMdText(files);
+
                     super.replaceSelection(mdText);
                 } else {
                     super.paste();

src/main/java/org/jabref/gui/fieldeditors/SimpleEditor.java

@@ -4,8 +4,10 @@
 
 import javafx.scene.Parent;
 import javafx.scene.control.TextInputControl;
+import javafx.scene.control.skin.TextAreaSkin;
 import javafx.scene.layout.HBox;
 import javafx.scene.layout.Priority;
+import javafx.scene.text.HitInfo;
 
 import org.jabref.gui.autocompleter.AutoCompletionTextInputBinding;
 import org.jabref.gui.autocompleter.ContentSelectorSuggestionProvider;
@@ -73,6 +75,24 @@ public void requestFocus() {
         textInput.requestFocus();
     }
 
+    public void insertTextFromDragInput(double x, double y, String text) {
+        TextAreaSkin skin = (TextAreaSkin) textInput.getSkin();
+
+        HitInfo hit = skin.getIndex(x, y);
+
+        skin.positionCaret(hit, false);
+
+        int insertionPoint = hit.getInsertionIndex();
+
+        textInput.getLength();
+
+        if (insertionPoint > textInput.getLength()) {
+            textInput.appendText("\n\n" + text);
+        } else {
+            textInput.insertText(insertionPoint, text);
+        }
+    }
+
     protected TextInputControl getTextInput() {
         return textInput;
     }