How do I reset perspective for Eclipse e4 RCP application?

Question

After building a perspective in application.e4xmi file, I am unable to reset perspective by calling IWorkbenchPage.resetPerspective().

Answer 1

Reset perspective (when you lunch e4 application without clearing work space, when you switch other perspective to your perceptive).

Step 1: Add a add-on in your model fragment at application level.

Step 2: Create Add-on class and implement EventHandler

Step 3: add following code in the class.

public class ResetPrespectiveAddOn implements EventHandler {

private static final String MY_PERSPECTIVE_ID = "myPrespectiveId";

@Inject
private IEventBroker broker;

@PostConstruct
public void loadPrespective() {

    broker.subscribe(UIEvents.ElementContainer.TOPIC_SELECTEDELEMENT, this);
}

@SuppressWarnings("restriction")
@Override
public void handleEvent(Event event) {

    //UIEvents.EventTags.ELEMENT is trigger  for all UI activity
    Object property = event.getProperty(UIEvents.EventTags.ELEMENT);
    if (!(property instanceof PerspectiveStackImpl)) {
        return;

    }

    // Reset perspective logic .
    IEclipseContext serviceContext = E4Workbench.getServiceContext();
    final IEclipseContext appContext = (IEclipseContext) serviceContext.getActiveChild();
    EModelService modelService = appContext.get(EModelService.class);
    MApplication application = serviceContext.get(MApplication.class);
    MWindow mWindow = application.getChildren().get(0);

    PerspectiveStackImpl perspectiveStack = (PerspectiveStackImpl) property;
    List children = perspectiveStack.getChildren();
    for (MPerspective myPerspective : children) {
        if (myPerspective.getElementId().equals(MY_PERSPECTIVE_ID)) {

            //find active perspective
            MPerspective activePerspective = modelService.getActivePerspective(mWindow);
            if(activePerspective.getElementId().equals(MY_PERSPECTIVE_ID))

            //Reseting perspective  e3 way 
            PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().resetPerspective();


            // till now there is no direct e4 way to reset perspective 
            // but u can Add and remove e4 perspective with this code code              
            EPartService partService = serviceContext.get(EPartService.class);
            MPerspectiveStack perspectiveStack = (MPerspectiveStack) (MElementContainer) activePerspective.getParent();
            int indexOf = perspectiveStack.getChildren().indexOf(activePerspective);
            perspectiveStack.getChildren().remove(indexOf);

            perspectiveStack.getChildren().add(myPerspective);
            partService.switchPerspective(myPerspective);
        }   
    }
}}