Java tutorial
/* * This file is part of LibrePlan * * Copyright (C) 2009-2010 Fundacin para o Fomento da Calidade Industrial e * Desenvolvemento Tecnolxico de Galicia * Copyright (C) 2010-2012 Igalia, S.L. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.libreplan.web.orders; import static org.libreplan.web.I18nHelper._; import java.text.DateFormat; import java.text.ParseException; import java.util.Date; import java.util.List; import org.apache.commons.lang3.StringUtils; import org.libreplan.web.common.Util; import org.zkoss.ganttz.util.ComponentsFinder; import org.zkoss.util.Locales; import org.zkoss.zk.ui.Component; import org.zkoss.zk.ui.WrongValueException; import org.zkoss.zk.ui.event.Event; import org.zkoss.zk.ui.event.EventListener; import org.zkoss.zk.ui.util.GenericForwardComposer; import org.zkoss.zul.Datebox; import org.zkoss.zul.Hbox; import org.zkoss.zul.Textbox; /** * Textbox component which is transformed into a Datebox picker on demand. * <br /> * * @author Susana Montes Pedreira <smontes@wirelessgalicia.com> * @author Lorenzo Tilve ?lvaro <ltilve@igalia.com> * @author Manuel Rego Casasnovas <mrego@igalia.com> * @author Jacobo Aragunde Prez <jaragunde@igalia.com> */ public class DynamicDatebox extends GenericForwardComposer { final Getter<Date> getter; final Setter<Date> setter; private Textbox dateTextBox; private Datebox dateBox; private DateFormat dateFormat; private boolean disabled = false; public DynamicDatebox(Getter<Date> getter, Setter<Date> setter) { this.setter = setter; this.getter = getter; this.dateFormat = DateFormat.getDateInstance(DateFormat.SHORT, Locales.getCurrent()); } private Datebox createDateBox() { dateBox = new Datebox(); dateBox.setFormat("short"); dateBox.setValue(getter.get()); registerOnEnterOpenDateBox(dateBox); registerBlurListener(dateBox); registerOnChange(dateBox); dateTextBox.getParent().appendChild(dateBox); return dateBox; } private Datebox getDateBox() { return dateBox; } /** * When a text box associated to a datebox is requested to show the datebox, the corresponding datebox is shown. * * @param component * the component that has received focus */ private void userWantsDateBox(Component component) { if (component == dateTextBox) { showDateBox(dateTextBox); } } private void showDateBox(Textbox associatedTextBox) { associatedTextBox.setVisible(false); getDateBox(); createDateBox(); dateBox.setFocus(true); dateBox.setOpen(true); } /** * When the dateBox loses focus the corresponding textbox is shown instead. * * @param currentDateBox * the component that has lost focus */ private void dateBoxHasLostFocus(Datebox currentDateBox) { if (currentDateBox == dateBox) { hideDateBox(dateTextBox); } } private void hideDateBox(Textbox associatedTextBox) { dateBox.detach(); associatedTextBox.setVisible(true); } public void doAfterCompose(Component component) throws Exception { findComponents((Hbox) component); registerListeners(); updateComponents(); applyDisabledToElements(disabled); } private void registerListeners() { registerOnEnterListener(dateTextBox); Util.bind(dateTextBox, new Util.Getter<String>() { @Override public String get() { return asString(getter.get()); } }, new Util.Setter<String>() { @Override public void set(String string) { try { setter.set(fromString(string)); } catch (ParseException e) { throw new WrongValueException(dateTextBox, _("Date format is wrong. Please, use the following format: {0}", asString(new Date()))); } } }); } private void findComponents(Hbox hbox) { List<Component> children = hbox.getChildren(); assert children.size() == 1; dateTextBox = findTextBoxOfCell(children); } private static Textbox findTextBoxOfCell(List<Component> children) { return ComponentsFinder.findComponentsOfType(Textbox.class, children).get(0); } private void registerOnChange(Component component) { component.addEventListener("onChange", new EventListener() { @Override public void onEvent(Event event) { updateBean(); updateComponents(); } }); } private void registerOnEnterListener(final Textbox textBox) { textBox.addEventListener("onOK", new EventListener() { @Override public void onEvent(Event event) { userWantsDateBox(textBox); } }); } private void registerOnEnterOpenDateBox(final Datebox currentDatebox) { currentDatebox.addEventListener("onOK", new EventListener() { @Override public void onEvent(Event event) { currentDatebox.setOpen(true); } }); } private void registerBlurListener(final Datebox currentDatebox) { currentDatebox.addEventListener("onBlur", new EventListener() { @Override public void onEvent(Event event) { dateBoxHasLostFocus(currentDatebox); } }); } public interface Getter<Date> { /** * Typical get method that returns a variable. * * @return A variable of type Date. */ Date get(); } public interface Setter<Date> { /** * Typical set method to store a variable. * * @param value * A variable of type Date to be set. */ void set(Date value); } private void updateBean() { Date date = getDateBox().getValue(); setter.set(date); } public void updateComponents() { getDateTextBox().setValue(asString(getter.get())); } private String asString(Date date) { if (date == null) { return ""; } return dateFormat.format(date); } private Date fromString(String string) throws ParseException { if (StringUtils.isBlank(string)) { return null; } return dateFormat.parse(StringUtils.trim(string)); } public Textbox getDateTextBox() { return dateTextBox; } public void setDateTextBox(Textbox dateTextBox) { this.dateTextBox = dateTextBox; } public boolean isDisabled() { return disabled; } public void setDisabled(boolean disabled) { this.disabled = disabled; applyDisabledToElements(disabled); } private void applyDisabledToElements(boolean disabled) { if (dateTextBox != null) { dateTextBox.setDisabled(disabled); } } }