Java tutorial
/** * Licensed to JumpMind Inc under one or more contributor * license agreements. See the NOTICE file distributed * with this work for additional information regarding * copyright ownership. JumpMind Inc licenses this file * to you under the GNU General Public License, version 3.0 (GPLv3) * (the "License"); you may not use this file except in compliance * with the License. * * You should have received a copy of the GNU General Public License, * version 3.0 (GPLv3) along with this library; if not, see * <http://www.gnu.org/licenses/>. * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package org.jumpmind.metl.ui.views.admin; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.Set; import org.jumpmind.metl.core.model.Group; import org.jumpmind.metl.core.model.User; import org.jumpmind.metl.ui.common.ApplicationContext; import org.jumpmind.metl.ui.common.ButtonBar; import org.jumpmind.metl.ui.common.TabbedPanel; import org.jumpmind.vaadin.ui.common.IUiPanel; import com.vaadin.data.Property.ValueChangeEvent; import com.vaadin.data.Property.ValueChangeListener; import com.vaadin.data.util.BeanItemContainer; import com.vaadin.event.ItemClickEvent; import com.vaadin.event.ItemClickEvent.ItemClickListener; import com.vaadin.server.FontAwesome; import com.vaadin.server.Page; import com.vaadin.ui.Button; import com.vaadin.ui.Button.ClickEvent; import com.vaadin.ui.Button.ClickListener; import com.vaadin.ui.Notification; import com.vaadin.ui.Table; import com.vaadin.ui.VerticalLayout; @SuppressWarnings("serial") public class GroupPanel extends VerticalLayout implements IUiPanel { ApplicationContext context; TabbedPanel tabbedPanel; Button newButton; Button editButton; Button removeButton; BeanItemContainer<Group> container; Table table; public GroupPanel(ApplicationContext context, TabbedPanel tabbedPanel) { this.context = context; this.tabbedPanel = tabbedPanel; ButtonBar buttonBar = new ButtonBar(); addComponent(buttonBar); newButton = buttonBar.addButton("New", FontAwesome.PLUS); newButton.addClickListener(new NewClickListener()); editButton = buttonBar.addButton("Edit", FontAwesome.EDIT); editButton.addClickListener(new EditClickListener()); removeButton = buttonBar.addButton("Remove", FontAwesome.TRASH_O); removeButton.addClickListener(new RemoveClickListener()); container = new BeanItemContainer<Group>(Group.class); table = new Table(); table.setSizeFull(); table.setCacheRate(100); table.setPageLength(100); table.setImmediate(true); table.setSelectable(true); table.setMultiSelect(true); table.setContainerDataSource(container); table.setVisibleColumns("name", "createTime", "lastUpdateTime"); table.setColumnHeaders("Name", "Create Time", "Update Time"); table.addItemClickListener(new TableItemClickListener()); table.addValueChangeListener(new TableValueChangeListener()); table.setSortContainerPropertyId("name"); table.setSortAscending(true); addComponent(table); setExpandRatio(table, 1.0f); refresh(); } @Override public void selected() { refresh(); } @Override public boolean closing() { return true; } @Override public void deselected() { } public void refresh() { container.removeAllItems(); container.addAll(context.getConfigurationService().findGroups()); table.sort(); setButtonsEnabled(); } protected void setButtonsEnabled() { Set<Group> selectedIds = getSelectedItems(); boolean enabled = selectedIds.size() > 0; editButton.setEnabled(enabled); removeButton.setEnabled(enabled); } @SuppressWarnings("unchecked") protected Set<Group> getSelectedItems() { return (Set<Group>) table.getValue(); } @SuppressWarnings("unchecked") protected Group getFirstSelectedItem() { Set<Group> groups = (Set<Group>) table.getValue(); Iterator<Group> iter = groups.iterator(); if (iter.hasNext()) { return iter.next(); } return null; } class NewClickListener implements ClickListener { public void buttonClick(ClickEvent event) { Group group = new Group(); GroupEditPanel editPanel = new GroupEditPanel(context, group); tabbedPanel.addCloseableTab(group.getId(), "Edit Group", getIcon(), editPanel); } } class EditClickListener implements ClickListener { public void buttonClick(ClickEvent event) { Group group = getFirstSelectedItem(); context.getConfigurationService().refresh(group); GroupEditPanel editPanel = new GroupEditPanel(context, group); tabbedPanel.addCloseableTab(group.getId(), "Edit Group", getIcon(), editPanel); } } class RemoveClickListener implements ClickListener { public void buttonClick(ClickEvent event) { List<User> users = new ArrayList<User>(); for (Group group : getSelectedItems()) { users.addAll(context.getConfigurationService().findUsersByGroup(group.getId())); if (users.size() > 10) { break; } } if (users.size() == 0) { for (Group group : getSelectedItems()) { context.getConfigurationService().delete(group); container.removeItem(group); } } else { String message = "There are " + users.size() + " users assigned to this group. " + "Re-assign or delete the users first. "; if (users.size() < 10) { message += users.toString(); } Notification note = new Notification("Cannot Delete", message); note.show(Page.getCurrent()); } table.setValue(null); setButtonsEnabled(); } } class TableItemClickListener implements ItemClickListener { long lastClick; public void itemClick(ItemClickEvent event) { if (event.isDoubleClick()) { editButton.click(); } else if (getSelectedItems().contains(event.getItemId()) && System.currentTimeMillis() - lastClick > 500) { table.setValue(null); } lastClick = System.currentTimeMillis(); } } class TableValueChangeListener implements ValueChangeListener { public void valueChange(ValueChangeEvent event) { setButtonsEnabled(); } } }