helpwindow.java

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/**
 *   Copyright 2004 Carlos Silva A.
 * 
 *   Licensed 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 jgantt.view;

import java.awt.BorderLayout;
import java.io.IOException;
import java.net.URL;

import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JViewport;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLFrameHyperlinkEvent;

import jgantt.Messages;

/**
 * HelpWindow despliega el contenido de la ayuda HTML en una ventana.
 * 
 * <p>$Date: 2005/05/11 22:10:42 $</p> 
 * @version $Revision: 1.6 $
 * @author Carlos Silva
 */
public class HelpWindow extends JFrame {
	/**
	 * 
	 */
	private static final long serialVersionUID = 3256436989241735473L;
	JEditorPane html;
	/**
	 * Inicializa y muestra la ventana de ayuda a partir de 
	 * un archivo obtenido usando getResource 
	 * @param path
	 */
	public HelpWindow(String path) {
		super(Messages.getString("help.title")); //$NON-NLS-1$

		URL url = null;		
		try {			
			url = HelpWindow.class.getResource(path); 
			//ClassLoader.getSystemResource(path);
		} catch (Exception e) {
			System.err.println(Messages.getString("help.error.open.failed") + path); //$NON-NLS-1$
			url = null;
		}
		initURL(url);
		setSize(500,480);
	}

	/**
	 * Crea una ventana de ayuda a partir de un URL
	 * @param url
	 */
	public HelpWindow(URL url) {
		super(Messages.getString("help.title")); //$NON-NLS-1$
		initURL(url);
		setSize(600,440);
	}

	private void initURL(URL url) {
		try {

			if (url != null) {
				html = new JEditorPane(url);
				html.setEditable(false);
				html.addHyperlinkListener(createHyperLinkListener());
				JScrollPane scroller = new JScrollPane();
				JViewport vp = scroller.getViewport();
				vp.add(html);
				getContentPane().add(scroller, BorderLayout.CENTER);
			}
		} catch (Exception e) {
			System.out.println(Messages.getString("help.error.init") + e); //$NON-NLS-1$
		}
		
	}

	public HyperlinkListener createHyperLinkListener() {
		return new HyperlinkListener() {
			public void hyperlinkUpdate(HyperlinkEvent e) {
				if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
					if (e instanceof HTMLFrameHyperlinkEvent) {
						((HTMLDocument) html.getDocument()).processHTMLFrameHyperlinkEvent((HTMLFrameHyperlinkEvent) e);
					} else {
						try {
							html.setPage(e.getURL());
						} catch (IOException ioe) {
							System.out.println(Messages.getString("help.error.follow.link") + ioe); //$NON-NLS-1$
						}
					}
				}
			}
		};
	}
	
	/**
	 * Funcion de test
	 * @param args
	 */
	public static void main(String[] args) {
		HelpWindow h = new HelpWindow("res/help/kbd.html");		
		h.setVisible(true);
	}
}