navigationtoolbar.java

Wicket一个开发Java Web应用程序框架。它使得开发web应用程序变得容易而轻松。 Wicket利用一个POJO data beans组件使得它可以与任何持久层技术相结合。

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.wicket.extensions.markup.html.repeater.data.table;

import org.apache.wicket.AttributeModifier;
import org.apache.wicket.markup.html.WebComponent;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.navigation.paging.PagingNavigator;
import org.apache.wicket.model.Model;

/**
 * Toolbar that displays links used to navigate the pages of the datatable as well as a message
 * about which rows are being displayed and their total number in the data table.
 * 
 * @author Igor Vaynberg (ivaynberg)
 * 
 */
public class NavigationToolbar extends AbstractToolbar
{
	private static final long serialVersionUID = 1L;

	private DataTable table;

	/**
	 * Constructor
	 * 
	 * @param table
	 *            data table this toolbar will be attached to
	 */
	public NavigationToolbar(final DataTable table)
	{
		super(table);
		this.table = table;

		WebMarkupContainer span = new WebMarkupContainer("span");
		add(span);
		span.add(new AttributeModifier("colspan", true, new Model(String
				.valueOf(table.getColumns().length))));

		span.add(newPagingNavigator("navigator", table));
		span.add(newNavigatorLabel("navigatorLabel", table));
	}


	/**
	 * Factory method used to create the paging navigator that will be used by the datatable
	 * 
	 * @param navigatorId
	 *            component id the navigator should be created with
	 * @param table
	 *            dataview used by datatable
	 * @return paging navigator that will be used to navigate the data table
	 */
	protected PagingNavigator newPagingNavigator(String navigatorId, final DataTable table)
	{
		return new PagingNavigator(navigatorId, table);
	}

	/**
	 * Factory method used to create the navigator label that will be used by the datatable
	 * 
	 * @param navigatorId
	 *            component id navigator label should be created with
	 * @param table
	 *            dataview used by datatable
	 * @return navigator label that will be used to navigate the data table
	 * 
	 */
	protected WebComponent newNavigatorLabel(String navigatorId, final DataTable table)
	{
		return new NavigatorLabel(navigatorId, table);
	}

	/**
	 * Hides this toolbar when there is only one page in the table
	 * 
	 * @see org.apache.wicket.Component#isVisible()
	 */
	public boolean isVisible()
	{
		return table.getPageCount() > 1;
	}
}