Examples of org.eclipse.ui.IWorkbenchPart

org.eclipse.ui.IWorkbenchPart
A workbench part is a visual component within a workbench page. There are two subtypes: view and editor, as defined by IViewPart and IEditorPart.
A view is typically used to navigate a hierarchy of information (like the workspace), open an editor, or display properties for the active editor. Modifications made in a view are saved immediately.
An editor is typically used to edit or browse a document or input object. The input is identified using an IEditorInput. Modifications made in an editor part follow an open-save-close lifecycle model.
This interface may be implemented directly. For convenience, a base implementation is defined in WorkbenchPart.
The lifecycle of a workbench part is as follows:
- When a part extension is created:
  - instantiate the part
  - create a part site
  - call part.init(site)
- When a part becomes visible in the workbench:
  - add part to presentation by calling part.createControl(parent) to create actual widgets
  - fire partOpened event to all listeners
- When a part is activated or gets focus:
  - call part.setFocus()
  - fire partActivated event to all listeners
- When a part is closed:
  - if save is needed, do save; if it fails or is canceled return
  - if part is active, deactivate part
  - fire partClosed event to all listeners
  - remove part from presentation; part controls are disposed as part of the SWT widget tree
  - call part.dispose()
After createPartControl has been called, the implementor may safely reference the controls created. When the part is closed these controls will be disposed as part of an SWT composite. This occurs before the IWorkbenchPart.dispose method is called. If there is a need to free SWT resources the part should define a dispose listener for its own control and free those resources from the dispose listener. If the part invokes any method on the disposed SWT controls after this point an SWTError will be thrown.

The last method called on IWorkbenchPart is dispose. This signals the end of the part lifecycle.

An important point to note about this lifecycle is that following a call to init, createControl may never be called. Thus in the dispose method, implementors must not assume controls were created.

Workbench parts implement the IAdaptable interface; extensions are managed by the platform's adapter manager.
@see IViewPart @see IEditorPart

  private IPartListener getPartListener() {
    if (partListener == null) {
      final IWorkbenchPartSite site = (IWorkbenchPartSite) appContext
          .getVariable(ISources.ACTIVE_SITE_NAME);


      final IWorkbenchPart currentPart;
      if (site instanceof MultiPageEditorSite) {
        currentPart = ((MultiPageEditorSite) site).getMultiPageEditor();
      } else {
        currentPart = site.getPart();
      }

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  /**
   * Initialize the action delegate by calling its lifecycle method.
   */
  private final boolean initDelegate() {
    final IWorkbenchPage page = window.getActivePage();
    final IWorkbenchPart activePart;
    final IEditorPart activeEditor;
    if (page == null) {
      activePart = null;
      activeEditor = null;
    } else {

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    /**
     * Notify the workbook page that the part pane has
     * been activated by the user.
     */
    public void requestActivation() {
        IWorkbenchPart part = partReference.getPart(true);
        // Cannot activate the outer bit of a MultiEditor. In previous versions of the 
        // workbench, MultiEditors had their own implementation of EditorPane for the purpose
        // of overriding requestActivation with a NOP... however, keeping the old pattern would
        // mean it is necessary to eagerly activate an editor's plugin in order to determine
        // what type of pane to create.

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     * Sets focus to this part.
     */
    public void setFocus() {
        requestActivation();


        IWorkbenchPart part = partReference.getPart(true);
        if (part != null) {
            Control control = getControl();
            if (!SwtUtil.isFocusAncestor(control)) {
                // First try to call part.setFocus
                part.setFocus();
            }
        }
    }

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   * (non-Javadoc)
   * 
   * @see org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands.ExecutionEvent)
   */
  public Object execute(ExecutionEvent event) throws ExecutionException {
    IWorkbenchPart part = HandlerUtil.getActivePartChecked(event);
    IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindowChecked(event);


    if (part instanceof IEditorPart) {
      window.getActivePage().closeEditor((IEditorPart) part, true);
    } else if (part instanceof IViewPart) {

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        if (EditorRegistry.EMPTY_EDITOR_ID.equals(getId())) {
          return getEmptyEditor(getDescriptor());
        }
        PartInitException exception = null;
        
        IWorkbenchPart result = null;
        
        // Try to restore the editor -- this does the real work of restoring the editor
        //
        try {
            result = createPartHelper();

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    }


    protected void fireActivePartChanged(IWorkbenchPartReference oldRef, IWorkbenchPartReference newRef) {
        partService.setActivePart(newRef);
        
        IWorkbenchPart realPart = newRef == null? null : newRef.getPart(false);
        selectionService.setActivePart(realPart);
    }

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    registerEnablement();
  }


  public Object execute(ExecutionEvent event) throws ExecutionException {


    IWorkbenchPart part = HandlerUtil.getActivePart(event);
    if (part != null) {
      IWorkbenchPartSite site = part.getSite();
      if (site instanceof PartSite) {
        PartPane pane = ((PartSite) site).getPane();
        pane.showSystemMenu();
      }
    }

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  protected Expression getEnabledWhenExpression() {
    if (enabledWhen == null) {
      enabledWhen = new Expression() {
        public EvaluationResult evaluate(IEvaluationContext context)
            throws CoreException {
          IWorkbenchPart part = InternalHandlerUtil
              .getActivePart(context);


          if (part != null) {
            return EvaluationResult.TRUE;
          }

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     */
    private void fillMenu(IMenuManager innerMgr) {
        // Remove all.
        innerMgr.removeAll();


        IWorkbenchPart sourcePart = getSourcePart();
        if (sourcePart == null) {
            return;
        }
        ShowInContext context = getContext(sourcePart);
        if (context == null) {

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