added drag and drop from model element library to tree editor

org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/internal/views/LibraryView.java

@@ -109,7 +109,11 @@ public class LibraryView extends ViewPart {
 			@Override
 			public boolean select(Viewer viewer, Object parentElement,
 					Object element) {
-				// TODO Auto-generated method stub
+
+				/*
+				 * if (element instanceof Prototype) { EObject prototypeObject =
+				 * ((Prototype) element).getPrototype(); return true; }
+				 */
 				return true;
 			}
 
@@ -135,6 +139,7 @@ public class LibraryView extends ViewPart {
 				return prototype.getName();
 			}
 			return super.getText(element);
+
 		}
 
 		// TODO (JE): getImage
@@ -144,5 +149,6 @@ public class LibraryView extends ViewPart {
 		 * return ModelElementService.getInstance().getImage(
 		 * prototype.getPrototypeObject()); } return super.getImage(element); }
 		 */
+
 	}
 }

org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/util/DragAndDropUtils.java

@@ -18,7 +18,6 @@ $Id$
 package org.fortiss.tooling.kernel.util;
 
 import org.eclipse.emf.ecore.EObject;
-import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.fortiss.tooling.kernel.services.IPrototypeService.Prototype;
 
@@ -34,11 +33,15 @@ public final class DragAndDropUtils {
 
 	/** Extracts the EObject contained in the given drop object. */
 	public static EObject extractDroppedEObject(Object data) {
-		if (data instanceof IStructuredSelection) {
-			return EObjectSelectionUtils.getFirstElement((ISelection) data);
-		}
-		if (data instanceof Prototype) {
-			return ((Prototype) data).getPrototypeCopy();
+		if (data instanceof IStructuredSelection
+				&& !((IStructuredSelection) data).isEmpty()) {
+			Object result = ((IStructuredSelection) data).getFirstElement();
+			if (result instanceof Prototype) {
+				return ((Prototype) result).getPrototypeCopy();
+			}
+			if (result instanceof EObject) {
+				return (EObject) result;
+			}
 		}
 		return null;
 	}