Improve Drag and Drop in Custom Entry types dialog

CHANGELOG.md

@@ -32,6 +32,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - We reworked the export order in the preferences and the save order in the library preferences. You can now set more than three sort criteria in your library preferences. [#7935](https://github.com/JabRef/jabref/pull/7935)
 - The metadata-to-pdf actions now also embeds the bibfile to the PDF. [#8037](https://github.com/JabRef/jabref/pull/8037)
 - The snap was updated to use the core20 base and to use lzo compression for better startup performance [#8109](https://github.com/JabRef/jabref/pull/8109)
+- We improved the Drag and Drop behavior in the "Customize Entry Types" Dialog [#6338](https://github.com/JabRef/jabref/issues/6338)
 
 ### Fixed
 

src/main/java/org/jabref/gui/Base.css

@@ -1055,6 +1055,27 @@ We want to have a look that matches our icons in the tool-bar */
     -fx-fill: -fx-text-background-color;
 }
 
+/* Drag and drop colored indicator */
+
+.table-row-cell:dragOver-bottom {
+    -fx-border-color: -jr-drag-target;
+    -fx-border-width: 0 0 2 0;
+    -fx-padding: 0 0 -2 0;
+}
+
+.table-row-cell:dragOver-center {
+    -fx-border-color: -jr-drag-target;
+    -fx-border-width: 1 1 1 1;
+    -fx-padding: -1 -1 -1 -1;
+    -fx-background-color: -jr-drag-target-hover;
+}
+
+.table-row-cell:dragOver-top {
+    -fx-border-color: -jr-drag-target;
+    -fx-border-width: 2 0 0 0;
+    -fx-padding: -2 0 0 0;
+}
+
 /* Improve the context menu of the main toolbar, when icons don't fit and you have to press the little arrow to see them */
 .mainToolbar .context-menu .glyph-icon {
     -fx-fill: -jr-theme-text;

src/main/java/org/jabref/gui/customentrytypes/CustomizeEntryTypeDialogView.java

@@ -6,7 +6,6 @@
 
 import javafx.application.Platform;
 import javafx.beans.property.ReadOnlyStringWrapper;
-import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
 import javafx.scene.control.Button;
 import javafx.scene.control.ButtonBar.ButtonData;
@@ -63,7 +62,6 @@ public class CustomizeEntryTypeDialogView extends BaseDialog<Void> {
     @FXML private Button addNewEntryTypeButton;
     @FXML private Button addNewFieldButton;
 
-
     @Inject private PreferencesService preferencesService;
     @Inject private StateManager stateManager;
     @Inject private DialogService dialogService;
@@ -184,12 +182,14 @@ private void setupTable() {
               .setOnDragDetected(this::handleOnDragDetected)
               .setOnDragDropped(this::handleOnDragDropped)
               .setOnDragOver(this::handleOnDragOver)
+              .setOnDragExited(this::handleOnDragExited)
               .install(fields);
 }
 
-    private void handleOnDragOver(FieldViewModel originalItem, DragEvent event) {
+    private void handleOnDragOver(TableRow<FieldViewModel> row, FieldViewModel originalItem, DragEvent event) {
         if ((event.getGestureSource() != originalItem) && event.getDragboard().hasContent(DragAndDropDataFormats.FIELD)) {
             event.acceptTransferModes(TransferMode.MOVE);
+            ControlHelper.setDroppingPseudoClasses(row, event);
         }
     }
 
@@ -206,30 +206,27 @@ private void handleOnDragDetected(TableRow<FieldViewModel> row, FieldViewModel f
     }
 
     private void handleOnDragDropped(TableRow<FieldViewModel> row, FieldViewModel originalItem, DragEvent event) {
-        boolean success = false;
-
-        ObservableList<FieldViewModel> items = fields.itemsProperty().get();
 
         if (localDragboard.hasType(FieldViewModel.class)) {
             FieldViewModel field = localDragboard.getValue(FieldViewModel.class);
-            int draggedIdx = 0;
-            for (int i = 0; i < items.size(); i++) {
-                if (items.get(i).equals(field)) {
-                    draggedIdx = i;
-                    field = items.get(i);
-                    break;
-                }
+            fields.getItems().remove(field);
+
+            if (row.isEmpty()) {
+                fields.getItems().add(field);
+            } else {
+                // decide based on drop position whether to add the element before or after
+                int offset = event.getY() > (row.getHeight() / 2) ? 1 : 0;
+                fields.getItems().add(row.getIndex() + offset, field);
             }
-            int thisIdx = items.indexOf(originalItem);
-            items.set(draggedIdx, originalItem);
-            items.set(thisIdx, field);
-            success = true;
         }
-
-        event.setDropCompleted(success);
+        event.setDropCompleted(true);
         event.consume();
     }
 
+    private void handleOnDragExited(TableRow<FieldViewModel> row, FieldViewModel fieldViewModel, DragEvent dragEvent) {
+        ControlHelper.removeDroppingPseudoClasses(row);
+    }
+
     @FXML
     void addEntryType() {
         EntryTypeViewModel newlyAdded = viewModel.addNewCustomEntryType();