de.tudarmstadt.ukp.csniper.webapp.support.wicket.ExpandableList.java Source code

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/*******************************************************************************
 * Copyright 2013
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universitt Darmstadt
 * 
 * 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 de.tudarmstadt.ukp.csniper.webapp.support.wicket;

import java.util.Map;
import java.util.Map.Entry;

import org.apache.wicket.AttributeModifier;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.MarkupStream;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.list.AbstractItem;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.markup.repeater.RepeatingView;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;

/**
 * This creates a list with expandable items, i.e. each list item consists of a caption and a hidden
 * body, which is displayed when the caption is clicked.
 * 
 * @author Erik-Ln Do Dinh
 */

public class ExpandableList extends Panel {
    private static final long serialVersionUID = 1L;

    private RepeatingView expandableList;
    private Map<String, String> items;

    public ExpandableList(String aId) {
        super(aId);
        initialize();
    }

    public ExpandableList(String aId, IModel<?> aModel) {
        super(aId, aModel);
        initialize();
    }

    /**
     * @param aList
     *            A map caption->body, from which the list will be created.
     */
    public ExpandableList(String aId, Map<String, String> aList) {
        super(aId);
        items = aList;
        initialize();
    }

    private void initialize() {
        expandableList = new RepeatingView("expandableList");
        AbstractItem item;
        for (Entry<String, String> entry : items.entrySet()) {
            item = new AbstractItem(expandableList.newChildId());

            final Label body = new Label("body", entry.getValue());
            body.setOutputMarkupPlaceholderTag(true).setVisible(false).setEscapeModelStrings(false);
            item.add(body);

            item.add(new AjaxLink<String>("caption", new Model<String>(entry.getKey())) {
                private static final long serialVersionUID = 1L;

                @Override
                public void onComponentTagBody(MarkupStream markupStream, ComponentTag openTag) {
                    replaceComponentTagBody(markupStream, openTag, getModelObject());
                }

                @Override
                public void onClick(AjaxRequestTarget aTarget) {
                    body.setVisible(!body.isVisible());
                    aTarget.add(body);
                }
            }.add(new AttributeModifier("class", new Model<String>("clickableElement"))));
            expandableList.add(item);
        }
        add(expandableList);
    }
}