private void updateButtons() {
    Object[] selected = ((IStructuredSelection) fPackageViewer.getSelection()).toArray();

    TablePart tablePart = getTablePart();
    tablePart.setButtonEnabled(ADD_INDEX, canAddExportedPackages());
    tablePart.setButtonEnabled(REMOVE_INDEX, isEditable() && selected.length > 0);
    tablePart.setButtonEnabled(PROPERTIES_INDEX, shouldEnableProperties(selected));
    tablePart.setButtonEnabled(
        CALCULATE_USE_INDEX, isEditable() && fPackageViewer.getTable().getItemCount() > 0);
  }
  @Override
  protected void createClient(Section section, FormToolkit toolkit) {
    section.setText(PDEUIMessages.ExportPackageSection_title);
    if (isFragment()) section.setDescription(PDEUIMessages.ExportPackageSection_descFragment);
    else section.setDescription(PDEUIMessages.ExportPackageSection_desc);

    Composite container = createClientContainer(section, 2, toolkit);
    createViewerPartControl(container, SWT.MULTI, 2, toolkit);
    TablePart tablePart = getTablePart();
    fPackageViewer = tablePart.getTableViewer();
    fPackageViewer.setContentProvider(new ExportPackageContentProvider());
    fPackageViewer.setLabelProvider(PDEPlugin.getDefault().getLabelProvider());
    fPackageViewer.setComparator(
        new ViewerComparator() {
          @Override
          public int compare(Viewer viewer, Object e1, Object e2) {
            String s1 = e1.toString();
            String s2 = e2.toString();
            if (s1.indexOf(" ") != -1) // $NON-NLS-1$
            s1 = s1.substring(0, s1.indexOf(" ")); // $NON-NLS-1$
            if (s2.indexOf(" ") != -1) // $NON-NLS-1$
            s2 = s2.substring(0, s2.indexOf(" ")); // $NON-NLS-1$
            return super.compare(viewer, s1, s2);
          }
        });
    toolkit.paintBordersFor(container);
    section.setClient(container);
    GridData gd = new GridData(GridData.FILL_BOTH);
    if (((ManifestEditor) getPage().getEditor()).isEquinox()) {
      gd.verticalSpan = 2;
      gd.minimumWidth = 300;
    }
    section.setLayout(FormLayoutFactory.createClearGridLayout(false, 1));
    section.setLayoutData(gd);
    makeActions();

    IBundleModel model = getBundleModel();
    fPackageViewer.setInput(model);
    model.addModelChangedListener(this);
    updateButtons();
  }
  @Override
  public void modelChanged(IModelChangedEvent event) {
    if (event.getChangeType() == IModelChangedEvent.WORLD_CHANGED) {
      fHeader = null;
      markStale();
      return;
    }

    if (getExportedPackageHeader().equals(event.getChangedProperty())) {
      refresh();
      // Bug 171896
      // Since the model sends a CHANGE event instead of
      // an INSERT event on the very first addition to the empty table
      // Selection should fire here to take this first insertion into account
      Object lastElement =
          fPackageViewer.getElementAt(fPackageViewer.getTable().getItemCount() - 1);
      if (lastElement != null) {
        fPackageViewer.setSelection(new StructuredSelection(lastElement));
      }

      return;
    }

    Object[] objects = event.getChangedObjects();
    for (Object changedObject : objects) {
      if (changedObject instanceof ExportPackageObject) {
        ExportPackageObject object = (ExportPackageObject) changedObject;
        switch (event.getChangeType()) {
          case IModelChangedEvent.INSERT:
            fPackageViewer.add(object);
            fPackageViewer.setSelection(new StructuredSelection(object), false);
            fPackageViewer.getTable().setFocus();
            break;
          case IModelChangedEvent.REMOVE:
            Table table = fPackageViewer.getTable();
            int index = table.getSelectionIndex();
            fPackageViewer.remove(object);
            table.setSelection(index < table.getItemCount() ? index : table.getItemCount() - 1);
            break;
          default:
            fPackageViewer.refresh(object);
        }
      }
    }
  }
 @Override
 protected void fillContextMenu(IMenuManager manager) {
   ISelection selection = fPackageViewer.getSelection();
   manager.add(fAddAction);
   boolean singleSelection =
       selection instanceof IStructuredSelection && ((IStructuredSelection) selection).size() == 1;
   if (singleSelection) manager.add(fGoToAction);
   manager.add(new Separator());
   if (!selection.isEmpty()) manager.add(fRemoveAction);
   getPage().getPDEEditor().getContributor().contextMenuAboutToShow(manager);
   if (singleSelection)
     manager.add(
         new Action(PDEUIMessages.ExportPackageSection_findReferences) {
           @Override
           public void run() {
             doSearch(fPackageViewer.getSelection());
           }
         });
   if (shouldEnableProperties(((IStructuredSelection) fPackageViewer.getSelection()).toArray())) {
     manager.add(new Separator());
     manager.add(fPropertiesAction);
   }
 }
 private void handleOpenProperties() {
   Object[] selected = ((IStructuredSelection) fPackageViewer.getSelection()).toArray();
   ExportPackageObject first = (ExportPackageObject) selected[0];
   DependencyPropertiesDialog dialog = new DependencyPropertiesDialog(isEditable(), first);
   dialog.create();
   PlatformUI.getWorkbench()
       .getHelpSystem()
       .setHelp(dialog.getShell(), IHelpContextIds.EXPORTED_PACKAGE_PROPERTIES);
   SWTUtil.setDialogSize(dialog, 400, -1);
   if (selected.length == 1) dialog.setTitle(((ExportPackageObject) selected[0]).getName());
   else dialog.setTitle(PDEUIMessages.ExportPackageSection_props);
   if (dialog.open() == Window.OK && isEditable()) {
     String newVersion = dialog.getVersion();
     for (Object selectedObject : selected) {
       ExportPackageObject object = (ExportPackageObject) selectedObject;
       if (!newVersion.equals(object.getVersion())) object.setVersion(newVersion);
     }
   }
 }
 @Override
 public void refresh() {
   fPackageViewer.refresh();
   super.refresh();
 }
 private void handleRemove() {
   Object[] removed = ((IStructuredSelection) fPackageViewer.getSelection()).toArray();
   for (Object removedObject : removed) {
     fHeader.removePackage((PackageObject) removedObject);
   }
 }