/*
 * 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.jmeter.gui.action;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import org.apache.jmeter.gui.GuiPackage;
import org.apache.jmeter.util.JMeterUtils;

/**
 * About Command. It may be extended in the future to add a list of installed
 * protocols, config options, etc.
 * 
 * @author <a href="bloritsch@apache.org">Berin Loritsch</a>
 * @version CVS $Revision: 493779 $ $Date: 2007-01-07 17:46:38 +0000 (Sun, 07 Jan 2007) $
 */
public class AboutCommand implements Command {
	private static Set commandSet;

	private static JDialog about;

	static {
		HashSet commands = new HashSet();
		commands.add(ActionNames.ABOUT);
		commandSet = Collections.unmodifiableSet(commands);
	}

	/**
	 * Handle the "about" action by displaying the "About Apache JMeter..."
	 * dialog box. The Dialog Box is NOT modal, because those should be avoided
	 * if at all possible.
	 */
	public void doAction(ActionEvent e) {
		if (e.getActionCommand().equals(ActionNames.ABOUT)) {
			this.about();
		}
	}

	/**
	 * Provide the list of Action names that are available in this command.
	 */
	public Set getActionNames() {
		return AboutCommand.commandSet;
	}

	/**
	 * Called by about button. Raises about dialog. Currently the about box has
	 * the product image and the copyright notice. The dialog box is centered
	 * over the MainFrame.
	 */
	void about() {
		JFrame mainFrame = GuiPackage.getInstance().getMainFrame();
		if (about == null) {
			about = new JDialog(mainFrame, "About Apache JMeter...", false);
			about.addMouseListener(new MouseAdapter() {
				public void mouseClicked(MouseEvent e) {
					about.setVisible(false);
				}
			});

			JLabel jmeter = new JLabel(JMeterUtils.getImage("jmeter.jpg"));
			JLabel copyright = new JLabel(JMeterUtils.getJMeterCopyright(), JLabel.CENTER);
			JLabel rights = new JLabel("All Rights Reserved.", JLabel.CENTER);
			JLabel version = new JLabel("Apache JMeter Version " + JMeterUtils.getJMeterVersion(), JLabel.CENTER);
			JPanel infos = new JPanel();
			infos.setOpaque(false);
			infos.setLayout(new GridLayout(0, 1));
			infos.setBorder(new EmptyBorder(5, 5, 5, 5));
			infos.add(copyright);
			infos.add(rights);
			infos.add(version);
			Container panel = about.getContentPane();
			panel.setLayout(new BorderLayout());
			panel.setBackground(Color.white);
			panel.add(jmeter, BorderLayout.NORTH);
			panel.add(infos, BorderLayout.SOUTH);
		}

		// NOTE: these lines center the about dialog in the
		// current window. Some older Swing versions have
		// a bug in getLocationOnScreen() and they may not
		// make this behave properly.
		Point p = mainFrame.getLocationOnScreen();
		Dimension d1 = mainFrame.getSize();
		Dimension d2 = about.getSize();
		about.setLocation(p.x + (d1.width - d2.width) / 2, p.y + (d1.height - d2.height) / 2);
		about.pack();
		about.setVisible(true);
	}
}
