Java tutorial
/******************************************************************************* * Copyright (c) 2010-2014 SAP AG and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * SAP AG - initial API and implementation *******************************************************************************/ package org.eclipse.skalli.view.component; import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; import java.util.List; import java.util.UUID; import org.apache.commons.lang.StringUtils; import org.eclipse.skalli.commons.UUIDList; import org.eclipse.skalli.model.Project; import org.eclipse.skalli.model.PropertyName; import org.eclipse.skalli.services.entity.EntityServices; import org.eclipse.skalli.services.project.ProjectService; import com.vaadin.data.Item; import com.vaadin.data.Validator.InvalidValueException; import com.vaadin.data.util.IndexedContainer; import com.vaadin.ui.AbstractSelect; import com.vaadin.ui.AbstractSelect.Filtering; import com.vaadin.ui.Button; import com.vaadin.ui.Button.ClickEvent; import com.vaadin.ui.ComboBox; import com.vaadin.ui.HorizontalLayout; import com.vaadin.ui.Select; import com.vaadin.ui.VerticalLayout; public class MultiComboBox extends CustomField { private static final long serialVersionUID = -2946220818606365985L; private static final String STYLE_LAYOUT = "multicombobox-layout"; private static final String STYLE_LINE_LAYOUT = "multicombobox-line"; private static final String STYLE_BUTTON = "multicombobox-btn"; private UUIDList values; private VerticalLayout layout; private List<ComboBoxElement> comboBoxEntries; private String description; private String inputPrompt; private boolean readOnly; private int columns; private int maxSize; private static class ComboBoxElement { public ComboBoxElement(ComboBox comboBox) { this.comboBox = comboBox; comboBox.setItemCaptionPropertyId(ProjectDataSource.PROPERTY_DISPLAYNAME); comboBox.setItemCaptionMode(AbstractSelect.ITEM_CAPTION_MODE_PROPERTY); comboBox.setFilteringMode(Filtering.FILTERINGMODE_CONTAINS); comboBox.setImmediate(true); comboBox.setNewItemsAllowed(false); comboBox.setNullSelectionAllowed(true); } ComboBox comboBox; Button removeButton; } public MultiComboBox(String caption, UUIDList values) { if (values == null) { throw new IllegalArgumentException("argument 'values' must not be null"); } setCaption(caption); this.values = values; this.maxSize = Integer.MAX_VALUE; init(values); layout = new VerticalLayout(); layout.setStyleName(STYLE_LAYOUT); renderComboBoxes(); setCompositionRoot(layout); } private void renderComboBoxes() { int size = comboBoxEntries.size(); int last = size - 1; for (int i = 0; i <= last; ++i) { ComboBoxElement comboBoxEntry = comboBoxEntries.get(i); HorizontalLayout horLayout = new HorizontalLayout(); horLayout.setStyleName(STYLE_LINE_LAYOUT); ComboBox comboBox = comboBoxEntry.comboBox; if (comboBox.getValue() == null) { comboBox.setEnabled(!readOnly); } else { comboBox.setReadOnly(readOnly); } horLayout.addComponent(comboBox); if (!readOnly) { if (size > 1) { Button b = createRemoveButton(); comboBoxEntry.removeButton = b; horLayout.addComponent(b); } if (size < maxSize && i == last) { horLayout.addComponent(createAddButton()); } } layout.addComponent(horLayout); } } private void init(UUIDList values) { comboBoxEntries = new ArrayList<ComboBoxElement>(); if (values != null && !values.isEmpty()) { for (UUID value : values) { ComboBox comboBox = createComboBox(value); comboBoxEntries.add(new ComboBoxElement(comboBox)); } } else { ComboBox comboBox = createComboBox(null); comboBoxEntries.add(new ComboBoxElement(comboBox)); } } private ComboBox createComboBox(UUID uuid) { ComboBox comboBox = new ComboBox(null, new ProjectDataSource()); comboBox.setImmediate(true); if (description != null) { comboBox.setDescription(description); } if (inputPrompt != null) { comboBox.setInputPrompt(inputPrompt); } if (uuid != null) { ProjectService projectService = ((ProjectService) EntityServices.getByEntityClass(Project.class)); Project project = projectService.getByUUID(uuid); comboBox.select(project); } return comboBox; } public void setColumns(int columns) { this.columns = columns; for (ComboBoxElement entry : comboBoxEntries) { entry.comboBox.setWidth(columns, Select.UNITS_EM); } } public void setMaxSize(int maxSize) { this.maxSize = maxSize <= 0 ? Integer.MAX_VALUE : maxSize; requestRepaint(); } private Button createAddButton() { Button b = new Button("Add"); b.setStyleName(Button.STYLE_LINK); b.addStyleName(STYLE_BUTTON); b.setDescription("Add another entry"); b.setEnabled(!readOnly); b.addListener(new Button.ClickListener() { @Override public void buttonClick(ClickEvent event) { ComboBox cb = createComboBox(null); cb.setWidth(columns, Select.UNITS_EM); comboBoxEntries.add(new ComboBoxElement(cb)); layout.removeAllComponents(); renderComboBoxes(); } }); return b; } private Button createRemoveButton() { Button b = new Button("Remove"); b.setStyleName(Button.STYLE_LINK); b.addStyleName(STYLE_BUTTON); b.setDescription("Remove this entry"); b.setEnabled(!readOnly); b.addListener(new Button.ClickListener() { @Override public void buttonClick(ClickEvent event) { Button b = event.getButton(); Iterator<ComboBoxElement> it = comboBoxEntries.iterator(); while (it.hasNext()) { ComboBoxElement element = it.next(); if (element.removeButton == b) { it.remove(); break; } } layout.removeAllComponents(); renderComboBoxes(); } }); return b; } public void setInputPrompt(String inputPrompt) { this.inputPrompt = inputPrompt; for (ComboBoxElement element : comboBoxEntries) { element.comboBox.setInputPrompt(inputPrompt); } } @Override public void setDescription(String description) { this.description = description; for (ComboBoxElement element : comboBoxEntries) { element.comboBox.setDescription(description); } } @Override public Object getValue() { UUIDList uuid = new UUIDList(comboBoxEntries.size()); copyValues(uuid); return uuid; } @Override public void commit() throws SourceException, InvalidValueException { values.clear(); copyValues(values); } private void copyValues(UUIDList values) { for (ComboBoxElement entry : comboBoxEntries) { Project project = (Project) entry.comboBox.getValue(); if (project == null) { return; } UUID value = project.getUuid(); if (StringUtils.isNotBlank(value.toString())) { values.add(value); } } } @Override public Class<?> getType() { return Collection.class; } private static class ProjectDataSource extends IndexedContainer { private static final long serialVersionUID = 8192530422436522676L; @PropertyName(position = 0) public static final Object PROPERTY_DISPLAYNAME = "displayName"; public ProjectDataSource() { super(); addContainerProperty(Project.PROPERTY_NAME, String.class, null); addContainerProperty(Project.PROPERTY_PROJECTID, String.class, null); addContainerProperty(PROPERTY_DISPLAYNAME, String.class, null); ProjectService projectService = ((ProjectService) EntityServices.getByEntityClass(Project.class)); List<Project> projects = projectService.getAll(); for (Project project : projects) { addItem(project); } sort(new Object[] { Project.PROPERTY_NAME, Project.PROPERTY_PROJECTID }, new boolean[] { true, true }); } private Item addItem(Project project) { // item key = project instance Item item = getItem(project); if (item == null) { item = super.addItem(project); // IndexedContainer#addItem return null, if entry already exists!!! } if (item != null) { String projectId = project.getProjectId(); String name = project.getName(); item.getItemProperty(Project.PROPERTY_NAME).setValue(name); item.getItemProperty(Project.PROPERTY_PROJECTID).setValue(projectId); item.getItemProperty(PROPERTY_DISPLAYNAME).setValue(name + " <" + projectId + ">"); } return item; } } @Override public void setReadOnly(boolean readOnly) { this.readOnly = readOnly; layout.removeAllComponents(); renderComboBoxes(); } @Override public boolean isReadOnly() { return readOnly; } }