Duplicate selection option in Edit menu and popup menu (Ctrl+D)

diylc/diylc-core/src/org/diylc/common/IPlugInPort.java

@@ -183,6 +183,11 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP
    */
   void pasteComponents(Collection<IDIYComponent<?>> components);
 
+  /**
+   * Duplicates selected components and places them nearby.
+   */
+  void duplicateSelection();
+
   /**
    * Deletes all the selected components from the project.
    */

diylc/diylc-core/src/org/diylc/presenter/InstantiationManager.java

@@ -164,7 +164,7 @@ public class InstantiationManager {
     // Update the location according to mouse location
     updateSingleClick(scaledPoint, snapToGrid, gridSpacing);
   }
-
+  
   /**
    * Updates location of component slot based on the new mouse location.
    * 

diylc/diylc-core/src/org/diylc/presenter/Presenter.java

@@ -1410,6 +1410,38 @@ public class Presenter implements IPlugInPort {
         instantiationManager.getFirstControlPoint());
   }
 
+  @Override
+  public void duplicateSelection() {
+    LOG.info("duplicateSelection()");
+    if (selectedComponents.isEmpty()) {
+      LOG.debug("Nothing to duplicate");
+      return;
+    }
+    Project oldProject = currentProject.clone();
+    Set<IDIYComponent<?>> newSelection = new HashSet<IDIYComponent<?>>();
+
+    int grid = (int) currentProject.getGridSpacing().convertToPixels();
+    for (IDIYComponent<?> component : this.selectedComponents) {
+      try {
+        IDIYComponent<?> cloned = component.clone();
+        newSelection.add(cloned);
+        for (int i = 0; i < component.getControlPointCount(); i++) {
+          Point p = component.getControlPoint(i);
+          Point newPoint = new Point(p.x + grid, p.y + grid);
+          cloned.setControlPoint(newPoint, i);
+        }
+        currentProject.getComponents().add(cloned);
+      } catch (Exception e) {
+      }
+    }
+
+    updateSelection(newSelection);
+
+    messageDispatcher.dispatchMessage(EventType.PROJECT_MODIFIED, oldProject, currentProject.clone(), "Duplicate");    
+    projectFileManager.notifyFileChange();
+    messageDispatcher.dispatchMessage(EventType.REPAINT);
+  }
+
   @Override
   public void deleteSelectedComponents() {
     LOG.info("deleteSelectedComponents()");