Java tutorial
/* * Copyright (c) 2011 Brown Bag Consulting. * This file is part of the PureCRUD project. * Author: Juan Osuna * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License Version 3 * as published by the Free Software Foundation with the addition of the * following permission added to Section 15 as permitted in Section 7(a): * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY * Brown Bag Consulting, Brown Bag Consulting DISCLAIMS THE WARRANTY OF * NON INFRINGEMENT OF THIRD PARTY RIGHTS. * * 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/>. * * The interactive user interfaces in modified source and object code versions * of this program must display Appropriate Legal Notices, as required under * Section 5 of the GNU Affero General Public License. * * You can be released from the requirements of the license by purchasing * a commercial license. Buying such a license is mandatory as soon as you * develop commercial activities involving the PureCRUD software without * disclosing the source code of your own applications. These activities * include: offering paid services to customers as an ASP, providing * services from a web application, shipping PureCRUD with a closed * source product. * * For more information, please contact Brown Bag Consulting at this * address: juan@brownbagconsulting.com. */ package com.purebred.core.view; import com.purebred.core.util.MethodDelegate; import com.vaadin.terminal.ThemeResource; import com.vaadin.ui.*; import java.util.ArrayList; import java.util.List; /** * An entity form connected to results, allowing user to walk through the current * results using next or previous buttons. * * @param <T> type of entity in the entity form and results */ public class ResultsConnectedEntityForm<T> extends CustomComponent { private EntityForm<T> entityForm; private WalkableResults results; private Button nextButton; private Button previousButton; private List<MethodDelegate> walkListeners = new ArrayList<MethodDelegate>(); public ResultsConnectedEntityForm(EntityForm entityForm, WalkableResults results) { this.entityForm = entityForm; this.results = results; initialize(); } private void initialize() { setCompositionRoot(createNavigationFormLayout()); setSizeUndefined(); } private HorizontalLayout createNavigationFormLayout() { HorizontalLayout navigationFormLayout = new HorizontalLayout(); navigationFormLayout.setSizeUndefined(); VerticalLayout previousButtonLayout = new VerticalLayout(); previousButtonLayout.setSizeUndefined(); previousButtonLayout.setMargin(false); previousButtonLayout.setSpacing(false); Label spaceLabel = new Label("</br></br></br>", Label.CONTENT_XHTML); spaceLabel.setSizeUndefined(); previousButtonLayout.addComponent(spaceLabel); previousButton = new Button(null, this, "previousItem"); previousButton.setDescription(entityForm.uiMessageSource.getMessage("entityForm.previous.description")); previousButton.setSizeUndefined(); previousButton.addStyleName("borderless"); previousButton.setIcon(new ThemeResource("icons/16/previous.png")); if (entityForm.getViewableToManyRelationships().size() == 0) { HorizontalLayout previousButtonHorizontalLayout = new HorizontalLayout(); previousButtonHorizontalLayout.setSizeUndefined(); Label horizontalSpaceLabel = new Label(" ", Label.CONTENT_XHTML); horizontalSpaceLabel.setSizeUndefined(); previousButtonHorizontalLayout.addComponent(previousButton); previousButtonHorizontalLayout.addComponent(horizontalSpaceLabel); previousButtonLayout.addComponent(previousButtonHorizontalLayout); } else { previousButtonLayout.addComponent(previousButton); } navigationFormLayout.addComponent(previousButtonLayout); navigationFormLayout.setComponentAlignment(previousButtonLayout, Alignment.TOP_LEFT); navigationFormLayout.addComponent(entityForm); VerticalLayout nextButtonLayout = new VerticalLayout(); nextButtonLayout.setSizeUndefined(); nextButtonLayout.setMargin(false); nextButtonLayout.setSpacing(false); spaceLabel = new Label("</br></br></br>", Label.CONTENT_XHTML); spaceLabel.setSizeUndefined(); previousButtonLayout.addComponent(spaceLabel); nextButtonLayout.addComponent(spaceLabel); nextButton = new Button(null, this, "nextItem"); nextButton.setDescription(entityForm.uiMessageSource.getMessage("entityForm.next.description")); nextButton.setSizeUndefined(); nextButton.addStyleName("borderless"); nextButton.setIcon(new ThemeResource("icons/16/next.png")); HorizontalLayout nextButtonHorizontalLayout = new HorizontalLayout(); nextButtonHorizontalLayout.setSizeUndefined(); Label horizontalSpaceLabel = new Label(" ", Label.CONTENT_XHTML); horizontalSpaceLabel.setSizeUndefined(); nextButtonHorizontalLayout.addComponent(horizontalSpaceLabel); nextButtonHorizontalLayout.addComponent(nextButton); nextButtonLayout.addComponent(nextButtonHorizontalLayout); navigationFormLayout.addComponent(nextButtonLayout); navigationFormLayout.setComponentAlignment(nextButtonLayout, Alignment.TOP_RIGHT); navigationFormLayout.setSpacing(false); navigationFormLayout.setMargin(false); return navigationFormLayout; } void refreshNavigationButtonStates() { if (entityForm.isEntityPersistent()) { previousButton.setEnabled(results.hasPreviousItem()); nextButton.setEnabled(results.hasNextItem()); } else { previousButton.setEnabled(false); nextButton.setEnabled(false); } } /** * Go to previous item in the current results */ public void previousItem() { results.editOrViewPreviousItem(); refreshNavigationButtonStates(); onWalk(); } /** * Go to next item in the current results */ public void nextItem() { results.editOrViewNextItem(); refreshNavigationButtonStates(); onWalk(); } /** * Get entity form that is connected to results */ public EntityForm<T> getEntityForm() { return entityForm; } private void onWalk() { for (MethodDelegate walkListener : walkListeners) { walkListener.execute(); } } /** * Add a listener to detect any time user goes to next or previous records in results * * @param target target object to invoke * @param methodName name of method to invoke */ public void addWalkListener(Object target, String methodName) { walkListeners.add(new MethodDelegate(target, methodName)); } }