DateFieldUI.java

/**
 * This file Copyright (c) 2016 Magnolia International
 * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
 *
 *
 * This file is dual-licensed under both the Magnolia
 * Network Agreement and the GNU General Public License.
 * You may elect to use one or the other of these licenses.
 *
 * This file is distributed in the hope that it will be
 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
 * Redistribution, except as permitted by whichever of the GPL
 * or MNA you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or
 * modify this file under the terms of the GNU General
 * Public License, Version 3, as published by the Free Software
 * Foundation.  You should have received a copy of the GNU
 * General Public License, Version 3 along with this program;
 * if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 2. For the Magnolia Network Agreement (MNA), this file
 * and the accompanying materials are made available under the
 * terms of the MNA which accompanies this distribution, and
 * is available at http://www.magnolia-cms.com/mna.html
 *
 * Any modifications to this file must keep this entire header
 * intact.
 *
 */

package me.mkgl.sandbox.vaadin;

import static com.vaadin.server.Sizeable.Unit.PIXELS;
import static java.util.stream.Collectors.*;

import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.Optional;
import java.util.TimeZone;

import javax.servlet.annotation.WebServlet;

import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.data.Property;
import com.vaadin.data.util.BeanItemContainer;
import com.vaadin.server.Page;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.server.WebBrowser;
import com.vaadin.shared.ui.combobox.FilteringMode;
import com.vaadin.shared.ui.datefield.Resolution;
import com.vaadin.ui.AbstractSelect.ItemCaptionMode;
import com.vaadin.ui.ComboBox;
import com.vaadin.ui.DateField;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Notification;
import com.vaadin.ui.PopupDateField;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;

@Theme("valo")
public class DateFieldUI extends UI {

    @WebServlet(value = "/date/*", asyncSupported = true)
    @VaadinServletConfiguration(productionMode = false, ui = DateFieldUI.class)
    public static class Servlet extends VaadinServlet {
    }

    @Override
    protected void init(VaadinRequest request) {
        setSizeFull();
        VerticalLayout layout = new VerticalLayout();
        layout.setMargin(true);
        layout.setSpacing(true);
        layout.setSizeFull();

        WebBrowser browserInfo = Page.getCurrent().getWebBrowser();
        int rawOffset = browserInfo.getRawTimezoneOffset();
        boolean dst = browserInfo.isDSTInEffect();
        int dstSavings = browserInfo.getDSTSavings();
        Date requestDate = browserInfo.getCurrentDate();

        List<TimeZone> timeZoneCandidates = Arrays.stream(TimeZone.getAvailableIDs())
//        List<TimeZone> timeZoneCandidates = Arrays.stream(TimeZone.getAvailableIDs(rawOffset))
                .map(TimeZone::getTimeZone)
//                .filter(z -> z.inDaylightTime(requestDate) == dst)
//                .filter(z -> z.getDSTSavings() == dstSavings)
                .collect(toList());

        System.out.println(timeZoneCandidates.size());
        System.out.println(timeZoneCandidates.stream()
                .map(TimeZone::getID)
                .collect(joining("\n", "\n-----\n", "\n-----\n")));
        Optional<TimeZone> timeZone = timeZoneCandidates.stream().findFirst();
        System.out.println(timeZone);

        DateField testDate = new PopupDateField("Date");
        testDate.setResolution(Resolution.MINUTE);
        testDate.setWidth(400, PIXELS);
        testDate.addValueChangeListener(this::logDate);

        ComboBox testTimeZone = new ComboBox("Time zone", new BeanItemContainer<>(TimeZone.class, timeZoneCandidates));
        testTimeZone.setItemCaptionMode(ItemCaptionMode.PROPERTY);
        testTimeZone.setItemCaptionPropertyId("ID");
        testTimeZone.setNullSelectionAllowed(false);
        testTimeZone.setFilteringMode(FilteringMode.CONTAINS);
        testTimeZone.addValueChangeListener(e -> {
            TimeZone newTimeZone = (TimeZone) e.getProperty().getValue();
            testDate.setTimeZone(newTimeZone);
            logTimeZone(newTimeZone);
        });

        if (timeZone.isPresent()) {
            testTimeZone.setValue(timeZone.get());
        }
        testDate.setValue(requestDate);

        HorizontalLayout testDateRow = new HorizontalLayout(testTimeZone, testDate);
        testDateRow.setCaption("Test schedule");
        testDateRow.setSpacing(true);
        layout.addComponent(testDateRow);
        setContent(layout);
    }

    private void logDate(Property.ValueChangeEvent e) {
        String message = "Date changed to " + e.getProperty().getValue() + " (Server time)";
        Notification.show(message);
        System.out.println(message);
    }

    private void logTimeZone(TimeZone newTimeZone) {
        String message = "Time zone changed to " + newTimeZone.getID();
        Notification.show(message);
        System.out.println(message);
    }
}