Examples of com.vaadin.ui.UI

com.vaadin.ui.UI
The topmost component in any component hierarchy. There is one UI for every Vaadin instance in a browser window. A UI may either represent an entire browser window (or tab) or some part of a html page where a Vaadin application is embedded.
The UI is the server side entry point for various client side features that are not represented as components added to a layout, e.g notifications, sub windows, and executing javascript in the browser.

When a new UI instance is needed, typically because the user opens a URL in a browser window which points to e.g. {@link VaadinServlet}, all {@link UIProvider}s registered to the current {@link VaadinSession} arequeried for the UI class that should be used. The selection is by default based on the UI init parameter from web.xml.

After a UI has been created by the application, it is initialized using {@link #init(VaadinRequest)}. This method is intended to be overridden by the developer to add components to the user interface and initialize non-component functionality. The component hierarchy must be initialized by passing a {@link Component} with the main layout or other content of the viewto {@link #setContent(Component)} or to the constructor of the UI.
@see #init(VaadinRequest) @see UIProvider @since 7.0

            assert UI.getCurrent() == null;


            // Update browser information from the request
            session.getBrowser().updateRequestDetails(request);


            UI uI = getBrowserDetailsUI(request, session);


            session.getCommunicationManager().repaintAll(uI);


            JsonObject params = Json.createObject();
            params.put(UIConstants.UI_ID_PARAMETER, uI.getUIId());
            String initialUIDL = getInitialUidl(request, uI);
            params.put("uidl", initialUIDL);


            stringWriter.write(JsonUtil.stringify(params));
        } catch (JsonException e) {

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        for (UIProvider p : uiProviders) {
            // Check for existing LegacyWindow
            if (p instanceof LegacyApplicationUIProvider) {
                LegacyApplicationUIProvider legacyProvider = (LegacyApplicationUIProvider) p;


                UI existingUi = legacyProvider
                        .getExistingUI(classSelectionEvent);
                if (existingUi != null) {
                    reinitUI(existingUi, request);
                    return existingUi;
                }
            }


            uiClass = p.getUIClass(classSelectionEvent);
            if (uiClass != null) {
                provider = p;
                break;
            }
        }


        if (provider == null || uiClass == null) {
            return null;
        }


        // Check for an existing UI based on embed id


        String embedId = getEmbedId(request);


        UI retainedUI = session.getUIByEmbedId(embedId);
        if (retainedUI != null) {
            if (vaadinService.preserveUIOnRefresh(provider, new UICreateEvent(
                    request, uiClass))) {
                if (uiClass.isInstance(retainedUI)) {
                    reinitUI(retainedUI, request);
                    return retainedUI;
                } else {
                    getLogger().info(
                            "Not using the preserved UI " + embedId
                                    + " because it is of type "
                                    + retainedUI.getClass() + " but " + uiClass
                                    + " is expected for the request.");
                }
            }
            /*
             * Previous UI without preserve on refresh will be closed when the
             * new UI gets added to the session.
             */
        }


        // No existing UI found - go on by creating and initializing one


        Integer uiId = Integer.valueOf(session.getNextUIid());


        // Explicit Class.cast to detect if the UIProvider does something
        // unexpected
        UICreateEvent event = new UICreateEvent(request, uiClass, uiId);
        UI ui = uiClass.cast(provider.createInstance(event));


        // Initialize some fields for a newly created UI
        if (ui.getSession() != session) {
            // Session already set for LegacyWindow
            ui.setSession(session);
        }


        PushMode pushMode = provider.getPushMode(event);
        if (pushMode == null) {
            pushMode = session.getService().getDeploymentConfiguration()
                    .getPushMode();
        }
        ui.getPushConfiguration().setPushMode(pushMode);


        Transport transport = provider.getPushTransport(event);
        if (transport != null) {
            ui.getPushConfiguration().setTransport(transport);
        }


        // Set thread local here so it is available in init
        UI.setCurrent(ui);


        ui.doInit(request, uiId.intValue(), embedId);


        session.addUI(ui);


        // Warn if the window can't be preserved
        if (embedId == null

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    }


    @Override
    public boolean synchronizedHandleRequest(VaadinSession session,
            VaadinRequest request, VaadinResponse response) throws IOException {
        UI uI = session.getService().findUI(request);
        if (uI == null) {
            // This should not happen but it will if the UI has been closed. We
            // really don't want to see it in the server logs though
            response.getWriter().write(
                    getUINotFoundErrorJSON(session.getService(), request));

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     * 
     * @return the current page instance if available, otherwise
     *         <code>null</code>
     */
    public static Page getCurrent() {
        UI currentUI = UI.getCurrent();
        if (currentUI == null) {
            return null;
        }
        return currentUI.getPage();
    }

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public class AxessingWebPageAndBrowserInfoUI extends AbstractTestUI {


    @Override
    protected void setup(VaadinRequest request) {
        UI someUI = this;


        Page page = someUI.getPage();
        page.addBrowserWindowResizeListener(new BrowserWindowResizeListener() {
            @Override
            public void browserWindowResized(BrowserWindowResizeEvent event) {
                Notification.show("Window width=" + event.getWidth()
                        + ", height=" + event.getHeight());

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    private LegacyCommunicationManager cm;


    @Override
    protected void setUp() throws Exception {
        final VaadinSession application = new AlwaysLockedVaadinSession(null);
        final UI uI = new UI() {
            @Override
            protected void init(VaadinRequest request) {
                // TODO Auto-generated method stub


            }

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        }


    }


    private void prepareMockUI(Component newInstance) {
        UI ui = Mockito.mock(UI.class);
        Mockito.when(ui.getLocale()).thenReturn(Locale.ENGLISH);
        ConnectorTracker connectorTracker = Mockito
                .mock(ConnectorTracker.class);
        Mockito.when(ui.getConnectorTracker()).thenReturn(connectorTracker);
        Mockito.doThrow(new RuntimeException("getState(true) called in getter"))
                .when(connectorTracker).markDirty(newInstance);


        newInstance.setParent(ui);
    }

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    public void addSubWindow() {
        VaadinSession.setCurrent(new AlwaysLockedVaadinSession(null));
        TestApp app = new TestApp();
        app.init();
        Window subWindow = new Window("Sub window");
        UI mainWindow = app.getMainWindow();


        mainWindow.addWindow(subWindow);
        // Added to main window so the parent of the sub window should be the
        // main window
        assertEquals(subWindow.getParent(), mainWindow);


        try {
            mainWindow.addWindow(subWindow);
            assertTrue("Window.addWindow did not throw the expected exception",
                    false);
        } catch (IllegalArgumentException e) {
            // Should throw an exception as it has already been added to the
            // main window

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    @Test
    public void removeSubWindow() {
        TestApp app = new TestApp();
        app.init();
        Window subWindow = new Window("Sub window");
        UI mainWindow = app.getMainWindow();
        mainWindow.addWindow(subWindow);


        // Added to main window so the parent of the sub window should be the
        // main window
        assertEquals(subWindow.getParent(), mainWindow);


        // Parent should still be set
        assertEquals(subWindow.getParent(), mainWindow);


        // Remove from the main window and assert it has been removed
        boolean removed = mainWindow.removeWindow(subWindow);
        assertTrue("Window was not removed correctly", removed);
        assertNull(subWindow.getParent());
    }

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            when(requestWithUIIDSet.getParameter(UIConstants.UI_ID_PARAMETER))
                    .thenReturn("1");
            when(requestWithUIIDSet.getWrappedSession()).thenReturn(
                    emptyWrappedSession);


            UI ui = sut.findUI(requestWithUIIDSet);
            Assert.assertNull("Unset session did not return null", ui);
        } catch (NullPointerException e) {
            Assert.fail("findUI threw a NullPointerException");
        }
    }

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