extlibraryactionbarcontributor.java

EMF、GEF官方例子源代码

   * @generated
   */
  public void setActiveEditor(IEditorPart part)
  {
    super.setActiveEditor(part);
    activeEditorPart = part;

    // Switch to the new selection provider.
    //
    if (selectionProvider != null)
    {
      selectionProvider.removeSelectionChangedListener(this);
    }
    if (part == null)
    {
      selectionProvider = null;
    }
    else
    {
      selectionProvider = part.getSite().getSelectionProvider();
      selectionProvider.addSelectionChangedListener(this);

      // Fake a selection changed event to update the menus.
      //
      if (selectionProvider.getSelection() != null)
      {
        selectionChanged(new SelectionChangedEvent(selectionProvider, selectionProvider.getSelection()));
      }
    }
  }

  /**
   * This implements {@link org.eclipse.jface.viewers.ISelectionChangedListener},
   * handling {@link org.eclipse.jface.viewers.SelectionChangedEvent}s by querying for the children and siblings
   * that can be added to the selected object and updating the menus accordingly.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  public void selectionChanged(SelectionChangedEvent event)
  {
    // Remove any menu items for old selection.
    //
    if (createChildMenuManager != null)
    {
      depopulateManager(createChildMenuManager, createChildActions);
    }
    if (createSiblingMenuManager != null)
    {
      depopulateManager(createSiblingMenuManager, createSiblingActions);
    }

    // Query the new selection for appropriate new child/sibling descriptors
    //
    Collection newChildDescriptors = null;
    Collection newSiblingDescriptors = null;

    ISelection selection = event.getSelection();
    if (selection instanceof IStructuredSelection && ((IStructuredSelection)selection).size() == 1)
    {
      Object object = ((IStructuredSelection)selection).getFirstElement();

      EditingDomain domain = ((IEditingDomainProvider)activeEditorPart).getEditingDomain();

      newChildDescriptors = domain.getNewChildDescriptors(object, null);
      newSiblingDescriptors = domain.getNewChildDescriptors(null, object);
    }

    // Generate actions for selection; populate and redraw the menus.
    //
    createChildActions = generateCreateChildActions(newChildDescriptors, selection);
    createSiblingActions = generateCreateSiblingActions(newSiblingDescriptors, selection);

    if (createChildMenuManager != null)
    {
      populateManager(createChildMenuManager, createChildActions, null);
      createChildMenuManager.update(true);
    }
    if (createSiblingMenuManager != null)
    {
      populateManager(createSiblingMenuManager, createSiblingActions, null);
      createSiblingMenuManager.update(true);
    }
  }

  /**
   * This generates a {@link org.eclipse.emf.edit.ui.action.CreateChildAction} for each object in <code>descriptors</code>,
   * and returns the collection of these actions.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected Collection generateCreateChildActions(Collection descriptors, ISelection selection)
  {
    Collection actions = new ArrayList();
    if (descriptors != null)
    {
      for (Iterator i = descriptors.iterator(); i.hasNext(); )
      {
        actions.add(new CreateChildAction(activeEditorPart, selection, i.next()));
      }
    }
    return actions;
  }

  /**
   * This generates a {@link org.eclipse.emf.edit.ui.action.CreateSiblingAction} for each object in <code>descriptors</code>,
   * and returns the collection of these actions.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected Collection generateCreateSiblingActions(Collection descriptors, ISelection selection)
  {
    Collection actions = new ArrayList();
    if (descriptors != null)
    {
      for (Iterator i = descriptors.iterator(); i.hasNext(); )
      {
        actions.add(new CreateSiblingAction(activeEditorPart, selection, i.next()));
      }
    }
    return actions;
  }

  /**
   * This populates the specified <code>manager</code> with {@link org.eclipse.jface.action.ActionContributionItem}s
   * based on the {@link org.eclipse.jface.action.IAction}s contained in the <code>actions</code> collection,
   * by inserting them before the specified contribution item <code>contributionID</code>.
   * If <code>ID</code> is <code>null</code>, they are simply added.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected void populateManager(IContributionManager manager, Collection actions, String contributionID)
  {
    if (actions != null)
    {
      for (Iterator i = actions.iterator(); i.hasNext(); )
      {
        IAction action = (IAction)i.next();
        if (contributionID != null)
        {
          manager.insertBefore(contributionID, action);
        }
        else
        {
          manager.add(action);
        }
      }
    }
  }
    
  /**
   * This removes from the specified <code>manager</code> all {@link org.eclipse.jface.action.ActionContributionItem}s
   * based on the {@link org.eclipse.jface.action.IAction}s contained in the <code>actions</code> collection.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected void depopulateManager(IContributionManager manager, Collection actions)
  {
    if (actions != null)
    {
      IContributionItem[] items = manager.getItems();
      for (int i = 0; i < items.length; i++)
      {
        // Look into SubContributionItems
        //
        IContributionItem contributionItem = items[i];
        while (contributionItem instanceof SubContributionItem)
        {
          contributionItem = ((SubContributionItem)contributionItem).getInnerItem();
        }

        // Delete the ActionContributionItems with matching action.
        //
        if (contributionItem instanceof ActionContributionItem)
        {
          IAction action = ((ActionContributionItem)contributionItem).getAction();
          if (actions.contains(action))
          {
            manager.remove(contributionItem);
          }
        }
      }
    }
  }

  /**
   * This populates the pop-up menu before it appears.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  public void menuAboutToShow(IMenuManager menuManager)
  {
    super.menuAboutToShow(menuManager);
    MenuManager submenuManager = null;

    submenuManager = new MenuManager(EXTLibraryEditorPlugin.INSTANCE.getString("_UI_CreateChild_menu_item")); //$NON-NLS-1$
    populateManager(submenuManager, createChildActions, null);
    menuManager.insertBefore("edit", submenuManager); //$NON-NLS-1$

    submenuManager = new MenuManager(EXTLibraryEditorPlugin.INSTANCE.getString("_UI_CreateSibling_menu_item")); //$NON-NLS-1$
    populateManager(submenuManager, createSiblingActions, null);
    menuManager.insertBefore("edit", submenuManager); //$NON-NLS-1$
  }

  /**
   * This inserts global actions before the "additions-end" separator.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected void addGlobalActions(IMenuManager menuManager)
  {
    menuManager.insertAfter("additions-end", new Separator("ui-actions")); //$NON-NLS-1$ //$NON-NLS-2$
    menuManager.insertAfter("ui-actions", showPropertiesViewAction); //$NON-NLS-1$

    refreshViewerAction.setEnabled(refreshViewerAction.isEnabled());		
    menuManager.insertAfter("ui-actions", refreshViewerAction); //$NON-NLS-1$

    super.addGlobalActions(menuManager);
  }

  /**
   * This ensures that a delete action will clean up all references to deleted objects.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected boolean removeAllReferencesOnDelete()
  {
    return true;
  }

}