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.repeater;
018
019import org.apache.wicket.core.util.string.CssUtils;
020import org.apache.wicket.markup.ComponentTag;
021import org.apache.wicket.model.IModel;
022
023/**
024 * Item that sets class="even" or class="odd" attributes based on its index
025 * 
026 * @author Igor Vaynberg (ivaynberg)
027 * @param <T>
028 *            type of Item's model object
029 * 
030 */
031public class OddEvenItem<T> extends Item<T>
032{
033        private static final long serialVersionUID = 1L;
034
035        public static final String ODD_CSS_CLASS_KEY = CssUtils.key(OddEvenItem.class, "odd");
036
037        public static final String EVEN_CSS_CLASS_KEY = CssUtils.key(OddEvenItem.class, "even");
038
039        /**
040         * Constructor
041         * 
042         * @param id
043         *            component id
044         * @param index
045         *            item index
046         * @param model
047         *            item model
048         */
049        public OddEvenItem(String id, int index, IModel<T> model)
050        {
051                super(id, index, model);
052        }
053
054        @Override
055        protected void onComponentTag(ComponentTag tag)
056        {
057                super.onComponentTag(tag);
058
059                tag.put("class", (getIndex() % 2 == 0) ? getString(EVEN_CSS_CLASS_KEY) : getString(ODD_CSS_CLASS_KEY));
060        }
061
062}