Vaadin 7 Login Layout sample

LoginForm.java

package com.karmasms;

import com.karmasms.model.KarmaUser;
import com.karmasms.restclient.ApiClient;
import com.vaadin.data.validator.EmailValidator;
import com.vaadin.data.validator.NullValidator;
import com.vaadin.server.FontAwesome;
import com.vaadin.ui.Button;
import com.vaadin.ui.FormLayout;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Panel;
import com.vaadin.ui.PasswordField;
import com.vaadin.ui.TextField;
import com.vaadin.ui.themes.ValoTheme;

/**
 *
 * @author bashizip
 *
 */
public class LoginForm extends HorizontalLayout {

    private final ILoginStateListener loginStateListner;

    TextField tfUsername;
    PasswordField tfPassword;
    FormLayout loginLayout;
    Panel panel;
    Button passwordForgotten;

    public LoginForm(ILoginStateListener loginStateListner) {

        setMargin(true);

        this.loginStateListner = loginStateListner;
        panel = new Panel("Login");
        loginLayout = new FormLayout();
        loginLayout.setMargin(true);
        loginLayout.setImmediate(true);

        tfUsername = new TextField("Email");
        tfPassword = new PasswordField("Mot de Passe");
        tfUsername.setIcon(FontAwesome.USER);
        tfPassword.setIcon(FontAwesome.LOCK);

        passwordForgotten = new Button("Mot de passe oublié?");
        passwordForgotten.setStyleName(ValoTheme.BUTTON_LINK);

        passwordForgotten.addClickListener(new Button.ClickListener() {

            @Override
            public void buttonClick(Button.ClickEvent event) {
                doLogin();
            }
        });

        Button btnLogin = new Button("Connection", new LoginClickListener());
        btnLogin.setIcon(FontAwesome.CHECK);
        btnLogin.setStyleName(ValoTheme.BUTTON_PRIMARY);
        btnLogin.setStyleName(ValoTheme.BUTTON_FRIENDLY);

        loginLayout.setSpacing(true);
        loginLayout.addComponents(tfUsername, tfPassword, btnLogin);
        loginLayout.addComponent(passwordForgotten);

        validateValues();
        panel.setContent(loginLayout);
        addComponent(panel);

    }

    class LoginClickListener implements Button.ClickListener {

        @Override
        public void buttonClick(Button.ClickEvent event) {
            if (!tfUsername.isValid() || !tfPassword.isValid()) {
                return;
            }
             doLogin();
        }

    }

    void doLogin() {

        KarmaUser userToLogin = new KarmaUser(tfUsername.getValue());
        userToLogin.setPassword(tfPassword.getValue());
        KarmaUser res = null;

        try {
            res = ApiClient.getMyApiServiceClient().login(userToLogin);
        } catch (Exception e) {
        }
        if (res != null) {

            if (res.getRepresentant() != null) {

                if (!res.getRepresentant().equals("")) {
                    loginStateListner.onLoginSuccessFull(res);
                }
            } else {
                loginStateListner.onWrongPassword();
            }
        }

    }

    public interface ILoginStateListener {

        void onLoginSuccessFull(KarmaUser user);

        void onWrongPassword();

        void onAccountNotFound();
    }

    private void validateValues() {

        tfUsername.addValidator(new EmailValidator("Wrong Email Adress"));
        tfUsername.addValidator(new NullValidator("Username canot be null", false));
        tfUsername.setRequired(true);
        tfPassword.setRequired(true);
        tfUsername.setImmediate(true);
        tfPassword.setImmediate(true);
    }
}