001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.markup.html.list;
018
019import org.apache.wicket.core.util.string.CssUtils;
020import org.apache.wicket.markup.ComponentTag;
021import org.apache.wicket.model.IModel;
022
023/**
024 * ListItem that adds <code>class="odd"</code> or <code>class="even"</code> html attribute depending
025 * on its index. Useful for creating zebra styling for html tables.
026 * 
027 * @author ivaynberg
028 * @param <T>
029 */
030public class OddEvenListItem<T> extends ListItem<T>
031{
032        private static final long serialVersionUID = 1L;
033
034        public static final String ODD_CSS_CLASS_KEY = CssUtils.key(OddEvenListItem.class, "odd");
035
036        public static final String EVEN_CSS_CLASS_KEY = CssUtils.key(OddEvenListItem.class, "even");
037
038        /**
039         * Constructor
040         * 
041         * @param index
042         *            list item's index
043         * @param model
044         *            list item's model
045         */
046        public OddEvenListItem(int index, IModel<T> model)
047        {
048                super(index, model);
049        }
050
051        /** {@inheritDoc} */
052        @Override
053        protected void onComponentTag(ComponentTag tag)
054        {
055                super.onComponentTag(tag);
056
057                tag.append("class", (getIndex() % 2 == 0) ? getString(EVEN_CSS_CLASS_KEY) : getString(ODD_CSS_CLASS_KEY), " ");
058        }
059}