java-tutorials/libraries/src/main/java/com/baeldung/vaadin/VaadinUI.java

package com.baeldung.vaadin;

import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.server.ExternalResource;
import com.vaadin.server.FontAwesome;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.ui.Button;
import com.vaadin.ui.CheckBox;
import com.vaadin.ui.ComboBox;
import com.vaadin.ui.DateField;
import com.vaadin.ui.FormLayout;
import com.vaadin.ui.Grid;
import com.vaadin.ui.GridLayout;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.InlineDateField;
import com.vaadin.ui.Label;
import com.vaadin.ui.Link;
import com.vaadin.ui.ListSelect;
import com.vaadin.ui.NativeButton;
import com.vaadin.ui.NativeSelect;
import com.vaadin.ui.Panel;
import com.vaadin.ui.PasswordField;
import com.vaadin.ui.RichTextArea;
import com.vaadin.ui.TextArea;
import com.vaadin.ui.TextField;
import com.vaadin.ui.TwinColSelect;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;

import javax.servlet.annotation.WebServlet;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

@Theme("mytheme")
public class VaadinUI extends UI {

    @Override
    protected void init(VaadinRequest vaadinRequest) {
        final VerticalLayout verticalLayout = new VerticalLayout();
        verticalLayout.setSpacing(true);
        verticalLayout.setMargin(true);
        final GridLayout gridLayout = new GridLayout(3, 2);
        gridLayout.setSpacing(true);
        gridLayout.setMargin(true);
        final HorizontalLayout horizontalLayout = new HorizontalLayout();
        horizontalLayout.setSpacing(true);
        horizontalLayout.setMargin(true);
        final FormLayout formLayout = new FormLayout();
        formLayout.setSpacing(true);
        formLayout.setMargin(true);
        final GridLayout buttonLayout = new GridLayout(3, 5);
        buttonLayout.setMargin(true);
        buttonLayout.setSpacing(true);

        final Label label = new Label();
        label.setId("Label");
        label.setValue("Label Value");
        label.setCaption("Label");
        gridLayout.addComponent(label);

        final Link link = new Link("Baeldung",
          new ExternalResource("http://www.baeldung.com/"));
        link.setId("Link");
        link.setTargetName("_blank");
        gridLayout.addComponent(link);

        final TextField textField = new TextField();
        textField.setId("TextField");
        textField.setCaption("TextField:");
        textField.setValue("TextField Value");
        textField.setIcon(FontAwesome.USER);
        gridLayout.addComponent(textField);

        final TextArea textArea = new TextArea();
        textArea.setCaption("TextArea");
        textArea.setId("TextArea");
        textArea.setValue("TextArea Value");
        gridLayout.addComponent(textArea);

        final DateField dateField = new DateField("DateField", new Date(0));
        dateField.setId("DateField");
        gridLayout.addComponent(dateField);

        final PasswordField passwordField = new PasswordField();
        passwordField.setId("PasswordField");
        passwordField.setCaption("PasswordField:");
        passwordField.setValue("password");
        gridLayout.addComponent(passwordField);

        final RichTextArea richTextArea = new RichTextArea();
        richTextArea.setCaption("Rich Text Area");
        richTextArea.setValue("<h1>RichTextArea</h1>");
        richTextArea.setSizeFull();

        Panel richTextPanel = new Panel();
        richTextPanel.setContent(richTextArea);

        final InlineDateField inlineDateField = new InlineDateField();
        inlineDateField.setValue(new Date(0));
        inlineDateField.setCaption("Inline Date Field");
        horizontalLayout.addComponent(inlineDateField);

        Button normalButton = new Button("Normal Button");
        normalButton.setId("NormalButton");
        normalButton.addClickListener(e -> {
            label.setValue("CLICK");
        });
        buttonLayout.addComponent(normalButton);

        Button tinyButton = new Button("Tiny Button");
        tinyButton.addStyleName("tiny");
        buttonLayout.addComponent(tinyButton);

        Button smallButton = new Button("Small Button");
        smallButton.addStyleName("small");
        buttonLayout.addComponent(smallButton);


        Button largeButton = new Button("Large Button");
        largeButton.addStyleName("large");
        buttonLayout.addComponent(largeButton);


        Button hugeButton = new Button("Huge Button");
        hugeButton.addStyleName("huge");
        buttonLayout.addComponent(hugeButton);


        Button disabledButton = new Button("Disabled Button");
        disabledButton.setDescription("This button cannot be clicked");
        disabledButton.setEnabled(false);
        buttonLayout.addComponent(disabledButton);


        Button dangerButton = new Button("Danger Button");
        dangerButton.addStyleName("danger");
        buttonLayout.addComponent(dangerButton);


        Button friendlyButton = new Button("Friendly Button");
        friendlyButton.addStyleName("friendly");
        buttonLayout.addComponent(friendlyButton);

        Button primaryButton = new Button("Primary Button");
        primaryButton.addStyleName("primary");
        buttonLayout.addComponent(primaryButton);

        NativeButton nativeButton = new NativeButton("Native Button");
        buttonLayout.addComponent(nativeButton);

        Button iconButton = new Button("Icon Button");
        iconButton.setIcon(FontAwesome.ALIGN_LEFT);
        buttonLayout.addComponent(iconButton);

        Button borderlessButton = new Button("BorderLess Button");
        borderlessButton.addStyleName("borderless");
        buttonLayout.addComponent(borderlessButton);

        Button linkButton = new Button("Link Button");
        linkButton.addStyleName("link");
        buttonLayout.addComponent(linkButton);

        Button quietButton = new Button("Quiet Button");
        quietButton.addStyleName("quiet");
        buttonLayout.addComponent(quietButton);

        horizontalLayout.addComponent(buttonLayout);

        final CheckBox checkbox = new CheckBox("CheckBox");
        checkbox.setValue(true);
        checkbox.addValueChangeListener(e ->
          checkbox.setValue(!checkbox.getValue()));
        formLayout.addComponent(checkbox);

        List<String> numbers = new ArrayList<String>();
        numbers.add("One");
        numbers.add("Ten");
        numbers.add("Eleven");
        ComboBox comboBox = new ComboBox("ComboBox");
        comboBox.addItems(numbers);
        formLayout.addComponent(comboBox);

        ListSelect listSelect = new ListSelect("ListSelect");
        listSelect.addItems(numbers);
        listSelect.setRows(2);
        formLayout.addComponent(listSelect);

        NativeSelect nativeSelect = new NativeSelect("NativeSelect");
        nativeSelect.addItems(numbers);
        formLayout.addComponent(nativeSelect);

        TwinColSelect twinColSelect = new TwinColSelect("TwinColSelect");
        twinColSelect.addItems(numbers);

        Grid grid = new Grid("Grid");
        grid.setColumns("Column1", "Column2", "Column3");
        grid.addRow("Item1", "Item2", "Item3");
        grid.addRow("Item4", "Item5", "Item6");

        Panel panel = new Panel("Panel");
        panel.setContent(grid);
        panel.setSizeUndefined();

        verticalLayout.addComponent(gridLayout);
        verticalLayout.addComponent(richTextPanel);
        verticalLayout.addComponent(horizontalLayout);
        verticalLayout.addComponent(formLayout);
        verticalLayout.addComponent(twinColSelect);
        verticalLayout.addComponent(panel);
        setContent(verticalLayout);
    }

    @WebServlet(urlPatterns = "/*", name = "MyUIServlet", asyncSupported = true)
    @VaadinServletConfiguration(ui = VaadinUI.class, productionMode = false)
    public static class MyUIServlet extends VaadinServlet {
    }
}