vaadin-framework/uitest/src/main/java/com/vaadin/tests/components/loginform/LoginFormUIInLoginHandler.java

package com.vaadin.tests.components.loginform;

import com.vaadin.tests.components.TestBase;
import com.vaadin.ui.Label;
import com.vaadin.ui.LoginForm;
import com.vaadin.ui.UI;

public class LoginFormUIInLoginHandler extends TestBase {

    @Override
    protected void setup() {
        LoginForm lf = new LoginForm();
        lf.addLoginListener(event -> {
            UI r1 = UI.getCurrent();
            if (r1 != null) {
                addComponent(
                        new Label("UI.getCurrent().data: " + r1.getData()));
            } else {
                addComponent(new Label("UI.getCurrent() is null"));
            }
            UI r2 = event.getSource().getUI();
            if (r2 != null) {
                addComponent(
                        new Label("event.getSource().data: " + r2.getData()));
            } else {
                addComponent(new Label("event.getSource().getRoot() is null"));
            }
        });
        addComponent(lf);
        getLayout().getUI().setData("This UI");
    }

    @Override
    protected String getDescription() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    protected Integer getTicketNumber() {
        // TODO Auto-generated method stub
        return null;
    }

}