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.ajax.markup.html.form.AjaxSubmitLink; import org.apache.wicket.behavior.AttributeAppender; import org.apache.wicket.markup.html.WebMarkupContainer; import org.apache.wicket.markup.html.form.Form; import org.apache.wicket.markup.html.form.TextField; 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 java.io.Serializable; import java.util.Iterator; import java.util.List; /** * @author shood * */ public class MultiValueTextEditPanel<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 ID_EDIT = "edit"; private static final String CSS_DISABLED = " disabled"; public MultiValueTextEditPanel(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) { TextField text = new TextField<>(ID_TEXT, createTextModel(item.getModel())); text.add(new AjaxFormComponentUpdatingBehavior("onblur") { @Override protected void onUpdate(AjaxRequestTarget target) { } }); text.add(AttributeAppender.replace("placeholder", createEmptyItemPlaceholder())); if (!inputEnabled) { text.add(new AttributeModifier("disabled", "disabled")); } item.add(text); 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); } private void initButtons(WebMarkupContainer buttonGroup, final ListItem<T> item) { AjaxSubmitLink edit = new AjaxSubmitLink(ID_EDIT) { @Override protected void onSubmit(AjaxRequestTarget target, Form<?> form) { editPerformed(target, item.getModelObject()); } }; edit.add(new AttributeAppender("class", new AbstractReadOnlyModel<String>() { @Override public String getObject() { if (buttonsDisabled()) { return " " + CSS_DISABLED; } return ""; } })); buttonGroup.add(edit); 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 ""; } protected T createNewEmptyItem() { return (T) ""; } protected StringResourceModel createEmptyItemPlaceholder() { return createStringResource("TextField.universal.placeholder"); } protected void addValuePerformed(AjaxRequestTarget target) { List<T> objects = getModelObject(); objects.add(createNewEmptyItem()); performAddValueHook(target); target.add(this); } 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; } } performRemoveValueHook(target, item); target.add(this); } /** * Override to provide handling of edit event (edit button clicked) * */ protected void editPerformed(AjaxRequestTarget target, T object) { } /** * Override to provide the information about buttons enabled/disabled status * */ protected boolean buttonsDisabled() { return false; } /** * Override to provide custom hook when adding new value * */ protected void performAddValueHook(AjaxRequestTarget target) { } /** * Override to provide custom hook when removing value from list * */ protected void performRemoveValueHook(AjaxRequestTarget target, ListItem<T> item) { } }