Java tutorial
/* * Copyright (c) 2010-2013 Evolveum * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * 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 com.evolveum.midpoint.web.component.form.multivalue; import com.evolveum.midpoint.web.component.util.SimplePanel; import com.evolveum.midpoint.web.component.util.VisibleEnableBehaviour; import org.apache.wicket.AttributeModifier; import org.apache.wicket.ajax.AjaxRequestTarget; import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior; import org.apache.wicket.ajax.markup.html.AjaxLink; import org.apache.wicket.behavior.AttributeAppender; import org.apache.wicket.extensions.ajax.markup.html.autocomplete.AutoCompleteSettings; import org.apache.wicket.extensions.ajax.markup.html.autocomplete.AutoCompleteTextField; import org.apache.wicket.markup.html.WebMarkupContainer; import org.apache.wicket.markup.html.list.ListItem; import org.apache.wicket.markup.html.list.ListView; import org.apache.wicket.model.AbstractReadOnlyModel; import org.apache.wicket.model.IModel; import org.apache.wicket.model.StringResourceModel; import org.apache.wicket.util.string.Strings; import org.apache.wicket.validation.IValidator; import java.io.Serializable; import java.util.*; /** * @author shood * */ public class MultiValueAutoCompleteTextPanel<T extends Serializable> extends SimplePanel<List<T>> { private static final String ID_PLACEHOLDER_CONTAINER = "placeholderContainer"; private static final String ID_PLACEHOLDER_ADD = "placeholderAdd"; private static final String ID_REPEATER = "repeater"; private static final String ID_TEXT = "input"; private static final String ID_BUTTON_GROUP = "buttonGroup"; private static final String ID_ADD = "add"; private static final String ID_REMOVE = "delete"; private static final String CSS_DISABLED = " disabled"; private static final Integer AUTO_COMPLETE_LIST_SIZE = 10; public MultiValueAutoCompleteTextPanel(String id, IModel<List<T>> model, boolean inputEnabled) { super(id, model); setOutputMarkupId(true); initLayout(inputEnabled); } private void initLayout(final boolean inputEnabled) { WebMarkupContainer placeholderContainer = new WebMarkupContainer(ID_PLACEHOLDER_CONTAINER); placeholderContainer.setOutputMarkupPlaceholderTag(true); placeholderContainer.setOutputMarkupPlaceholderTag(true); placeholderContainer.add(new VisibleEnableBehaviour() { @Override public boolean isVisible() { return getModel().getObject().isEmpty(); } }); add(placeholderContainer); AjaxLink placeholderAdd = new AjaxLink(ID_PLACEHOLDER_ADD) { @Override public void onClick(AjaxRequestTarget target) { addValuePerformed(target); } }; placeholderAdd.add(new AttributeAppender("class", new AbstractReadOnlyModel<String>() { @Override public String getObject() { if (buttonsDisabled()) { return " " + CSS_DISABLED; } return ""; } })); placeholderAdd.setOutputMarkupId(true); placeholderAdd.setOutputMarkupPlaceholderTag(true); placeholderContainer.add(placeholderAdd); ListView repeater = new ListView<T>(ID_REPEATER, getModel()) { @Override protected void populateItem(final ListItem<T> item) { AutoCompleteSettings autoCompleteSettings = new AutoCompleteSettings(); autoCompleteSettings.setShowListOnEmptyInput(true); AutoCompleteTextField<String> autoCompleteEditor = new AutoCompleteTextField<String>(ID_TEXT, createTextModel(item.getModel()), autoCompleteSettings) { @Override protected Iterator<String> getChoices(String input) { return createAutoCompleteObjectList(input); } }; autoCompleteEditor.add(createAutoCompleteValidator()); autoCompleteEditor.add(new AjaxFormComponentUpdatingBehavior("onchange") { @Override protected void onUpdate(AjaxRequestTarget target) { } }); item.add(autoCompleteEditor); autoCompleteEditor.add(AttributeAppender.replace("placeholder", createEmptyItemPlaceholder())); if (!inputEnabled) { autoCompleteEditor.add(new AttributeModifier("disabled", "disabled")); } item.add(autoCompleteEditor); WebMarkupContainer buttonGroup = new WebMarkupContainer(ID_BUTTON_GROUP); item.add(buttonGroup); initButtons(buttonGroup, item); } }; repeater.setOutputMarkupId(true); repeater.setOutputMarkupPlaceholderTag(true); repeater.add(new VisibleEnableBehaviour() { @Override public boolean isVisible() { return !getModel().getObject().isEmpty(); } }); add(repeater); } protected T createNewEmptyItem() { return null; } private Iterator<String> createAutoCompleteObjectList(String input) { List<T> list = createObjectList(); List<String> choices = new ArrayList<>(AUTO_COMPLETE_LIST_SIZE); if (Strings.isEmpty(input)) { for (T object : list) { choices.add(createAutoCompleteObjectLabel(object)); if (choices.size() == AUTO_COMPLETE_LIST_SIZE) { break; } } return choices.iterator(); } for (T object : list) { if (createAutoCompleteObjectLabel(object).toLowerCase().startsWith(input.toLowerCase())) { choices.add(createAutoCompleteObjectLabel(object)); if (choices.size() == AUTO_COMPLETE_LIST_SIZE) { break; } } } return choices.iterator(); } private void initButtons(WebMarkupContainer buttonGroup, final ListItem<T> item) { AjaxLink add = new AjaxLink(ID_ADD) { @Override public void onClick(AjaxRequestTarget target) { addValuePerformed(target); } }; add.add(new AttributeAppender("class", getPlusClassModifier(item))); buttonGroup.add(add); AjaxLink remove = new AjaxLink(ID_REMOVE) { @Override public void onClick(AjaxRequestTarget target) { removeValuePerformed(target, item); } }; remove.add(new AttributeAppender("class", getMinusClassModifier())); buttonGroup.add(remove); } protected String getPlusClassModifier(ListItem<T> item) { if (buttonsDisabled()) { return CSS_DISABLED; } int size = getModelObject().size(); if (size <= 1) { return ""; } if (item.getIndex() == size - 1) { return ""; } return CSS_DISABLED; } protected String getMinusClassModifier() { if (buttonsDisabled()) { return CSS_DISABLED; } return ""; } /** * Creates a StringResourceModel containing a placeholder for editor textField when no value is present * */ protected StringResourceModel createEmptyItemPlaceholder() { return createStringResource("TextField.universal.placeholder"); } protected void addValuePerformed(AjaxRequestTarget target) { List<T> objects = getModelObject(); objects.add(createNewEmptyItem()); target.add(this); } /** * Creates IModel<String> - a value for label in main text field of editor * */ protected IModel<String> createTextModel(final IModel<T> model) { return new IModel<String>() { @Override public String getObject() { T obj = model.getObject(); return obj != null ? obj.toString() : null; } @Override public void setObject(String object) { model.setObject((T) object); } @Override public void detach() { } }; } protected void removeValuePerformed(AjaxRequestTarget target, ListItem<T> item) { List<T> objects = getModelObject(); Iterator<T> iterator = objects.iterator(); while (iterator.hasNext()) { T object = iterator.next(); if (object.equals(item.getModelObject())) { iterator.remove(); break; } } target.add(this); } /** * Provide a function to determine if buttons of editor are disabled/enabled * */ protected boolean buttonsDisabled() { return false; } /** * Provides an IValidator<String> for auto-complete edit field * */ protected IValidator<String> createAutoCompleteValidator() { return null; } /** * Create a List<T> of objects that are shown in autoComplete drop-down list * */ protected List<T> createObjectList() { return new ArrayList<>(); } /** * Creates label for item in autoComplete drop-down list. CAREFUL, this * method is also used to create String that is used as compare value with * users input to generate values for auto-complete drop-down * */ protected String createAutoCompleteObjectLabel(T object) { return object.toString(); } }