Offer only connectors in context menu of structural elements

Issue-Ref: 4113
Issue-Url: af3#4113



Signed-off-by: Simon Barner <barner@fortiss.org>

org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/utils/.ratings

 AbstractNameEditingSupport.java c57336a0e0da18711a1610ca667dfea76728807f GREEN
 ActionUtils.java 322f43d4f92f992daef8ac88eb0f9197c840c89b GREEN
-ContextMenuUtils.java 74a4264a1d3febb92c7cf9a78f6c12fa1c7ad2f0 GREEN
+ContextMenuUtils.java 0f20d4918d0ca48d937c734aaa0c0e55e8fb4610 YELLOW
 DragAndDropBaseUtils.java d375377f9124f6113b2a295e6b0e09ac8966e564 GREEN
 EllipseLayoutUIUtils.java 4dd9dbd96a45e8c455c019caa19e4a50f18336af GREEN
 FXDNDUtils.java 6ce94e239e68f9e2b3cc0524b072606f4a120076 GREEN

org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/utils/ContextMenuUtils.java

@@ -22,6 +22,7 @@ import java.util.List;
 
 import org.eclipse.emf.ecore.EObject;
 import org.fortiss.tooling.base.dnd.ElementDropContext;
+import org.fortiss.tooling.base.model.element.IConnector;
 import org.fortiss.tooling.base.model.element.IHierarchicElement;
 import org.fortiss.tooling.base.model.layout.Point;
 import org.fortiss.tooling.base.ui.layout.auto.IAutoLayouter;
@@ -31,6 +32,7 @@ import org.fortiss.tooling.kernel.extension.data.Prototype;
 import org.fortiss.tooling.kernel.service.ICommandStackService;
 import org.fortiss.tooling.kernel.service.IElementCompositorService;
 import org.fortiss.tooling.kernel.service.IPrototypeService;
+import org.fortiss.tooling.kernel.ui.service.IModelEditorBindingService;
 
 import javafx.scene.control.Menu;
 import javafx.scene.control.MenuItem;
@@ -47,12 +49,19 @@ public final class ContextMenuUtils {
 		IPrototypeService pers = IPrototypeService.getInstance();
 		IElementCompositorService ecs = IElementCompositorService.getInstance();
 		ICommandStackService css = ICommandStackService.getInstance();
+		EObject editedObject =
+				IModelEditorBindingService.getInstance().getActiveEditor().getEditedObject();
+
 		List<MenuItem> result = new ArrayList<>();
 		Menu newMenu = new Menu("New ...");
 		List<Prototype> protos = pers.getComposablePrototypes(target.getClass());
 		for(Prototype p : protos) {
 			EObject prototypeCopy = p.getPrototypeCopy();
-			if(ecs.canCompose(target, prototypeCopy, context)) {
+			// If the context menu is created for the currently edited object, offer all composable
+			// elements. Otherwise (i.e., if context menu is created for a structural element within
+			// the currently edited object), offer only (composable) connectors.
+			if((target == editedObject || prototypeCopy instanceof IConnector) &&
+					ecs.canCompose(target, prototypeCopy, context)) {
 				MenuItem mi = new MenuItem(p.getName());
 				mi.setOnAction(evt -> {
 					css.runAsCommand(target, () -> {