norecordstoolbar.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.WebMarkupContainer;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.model.ResourceModel;

/**
 * A toolbar that displays a "no records found" message when the data table contains no rows.
 * <p>
 * The message can be overridden by providing a resource with key
 * <code>datatable.no-records-found</code>
 * 
 * @see DefaultDataTable
 * 
 * @author Igor Vaynberg (ivaynberg)
 * 
 */
public class NoRecordsToolbar extends AbstractToolbar
{
	private static final long serialVersionUID = 1L;

	private static final IModel DEFAULT_MESSAGE_MODEL = new ResourceModel(
			"datatable.no-records-found", "No Records Found");

	/**
	 * Constructor
	 * 
	 * @param table
	 *            data table this toolbar will be attached to
	 */
	public NoRecordsToolbar(final DataTable table)
	{
		this(table, DEFAULT_MESSAGE_MODEL);
	}

	/**
	 * @param table
	 *            data table this toolbar will be attached to
	 * @param messageModel
	 *            model that will be used to display the "no records found" message
	 */
	public NoRecordsToolbar(final DataTable table, IModel messageModel)
	{
		super(table);
		WebMarkupContainer td = new WebMarkupContainer("td");
		add(td);

		td.add(new AttributeModifier("colspan", true, new Model(String
				.valueOf(table.getColumns().length))));
		td.add(new Label("msg", messageModel));
	}

	/**
	 * Only shows this toolbar when there are no rows
	 * 
	 * @see org.apache.wicket.Component#isVisible()
	 */
	public boolean isVisible()
	{
		return getTable().getRowCount() == 0;
	}

}