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}