Activate context menu on key press (#4004)

Author: tobiasdiez

src/main/java/org/jabref/gui/util/ViewModelTableRowFactory.java

@@ -3,11 +3,15 @@
 import java.util.function.BiConsumer;
 import java.util.function.Function;
 
+import javafx.geometry.Bounds;
+import javafx.geometry.Point2D;
 import javafx.scene.control.ContextMenu;
 import javafx.scene.control.TableRow;
 import javafx.scene.control.TableView;
 import javafx.scene.control.TreeTableCell;
 import javafx.scene.input.DragEvent;
+import javafx.scene.input.KeyCode;
+import javafx.scene.input.KeyEvent;
 import javafx.scene.input.MouseDragEvent;
 import javafx.scene.input.MouseEvent;
 import javafx.util.Callback;
@@ -101,6 +105,23 @@ public TableRow<S> call(TableView<S> tableView) {
                 }
                 event.consume();
             });
+
+            // Activate context menu if user presses the "context menu" key
+            tableView.addEventHandler(KeyEvent.KEY_RELEASED, event -> {
+                boolean rowFocused = !row.isEmpty() && tableView.getFocusModel().getFocusedIndex() == row.getIndex();
+                if (event.getCode() == KeyCode.CONTEXT_MENU && rowFocused) {
+                    // Get center of focused cell
+                    Bounds anchorBounds = row.getBoundsInParent();
+                    double x = anchorBounds.getMinX() + anchorBounds.getWidth() / 2;
+                    double y = anchorBounds.getMinY() + anchorBounds.getHeight() / 2;
+                    Point2D screenPosition = row.getParent().localToScreen(x, y);
+
+                    if (row.getContextMenu() == null) {
+                        row.setContextMenu(contextMenuFactory.apply(row.getItem()));
+                    }
+                    row.getContextMenu().show(row, screenPosition.getX(), screenPosition.getY());
+                }
+            });
         }
 
         if (toOnDragDetected != null) {