Programming Languages Suite/JBuilder8.iso/Solaris/resource/jre/demo/plugin/jfc/Metalworks/src/MetalworksHelp.java

Java Source | 2002-09-06 | 4.7 KB | 159 lines

/*
 * Copyright (c) 2002 Sun Microsystems, Inc. All  Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * -Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduct the above copyright
 *  notice, this list of conditions and the following disclaimer in
 *  the documentation and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT
 * BE LIABLE FOR ANY DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT
 * OF OR RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THE SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN
 * IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that Software is not designed, licensed or intended for
 * use in the design, construction, operation or maintenance of any nuclear
 * facility.
 */

/*
 * @(#)MetalworksHelp.java    1.9 02/06/13
 */

import javax.swing.*;
import java.awt.*;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.*;
import javax.swing.text.*;
import javax.swing.event.*;

/*
 * @version 1.9 06/13/02
 * @author Steve Wilson
 */
public class MetalworksHelp extends JInternalFrame {

    public MetalworksHelp() {
    super("Help", true, true, true, true);

           setFrameIcon( (Icon)UIManager.get("Tree.openIcon")); // PENDING(steve) need more general palce to get this icon
    setBounds( 200, 25, 400, 400);
    HtmlPane html = new HtmlPane();
    setContentPane(html);
    }

}


class HtmlPane extends JScrollPane implements HyperlinkListener {
    JEditorPane html;

    public HtmlPane() {
    try {
        File f = new File ("HelpFiles/toc.html");
        String s = f.getAbsolutePath();
        s = "file:"+s;
        URL url = new URL(s);
        html = new JEditorPane(s);
        html.setEditable(false);
        html.addHyperlinkListener(this);

        JViewport vp = getViewport();
        vp.add(html);
    } catch (MalformedURLException e) {
        System.out.println("Malformed URL: " + e);
    } catch (IOException e) {
        System.out.println("IOException: " + e);
    }
    }

    /**
     * Notification of a change relative to a
     * hyperlink.
     */
    public void hyperlinkUpdate(HyperlinkEvent e) {
    if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
        linkActivated(e.getURL());
    }
    }

    /**
     * Follows the reference in an
     * link.  The given url is the requested reference.
     * By default this calls <a href="#setPage">setPage</a>,
     * and if an exception is thrown the original previous
     * document is restored and a beep sounded.  If an
     * attempt was made to follow a link, but it represented
     * a malformed url, this method will be called with a
     * null argument.
     *
     * @param u the URL to follow
     */
    protected void linkActivated(URL u) {
    Cursor c = html.getCursor();
    Cursor waitCursor = Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR);
    html.setCursor(waitCursor);
    SwingUtilities.invokeLater(new PageLoader(u, c));
    }

    /**
     * temporary class that loads synchronously (although
     * later than the request so that a cursor change
     * can be done).
     */
    class PageLoader implements Runnable {

    PageLoader(URL u, Cursor c) {
        url = u;
        cursor = c;
    }

        public void run() {
        if (url == null) {
        // restore the original cursor
        html.setCursor(cursor);

        // PENDING(prinz) remove this hack when
        // automatic validation is activated.
        Container parent = html.getParent();
        parent.repaint();
        } else {
        Document doc = html.getDocument();
        try {
            html.setPage(url);
        } catch (IOException ioe) {
            html.setDocument(doc);
            getToolkit().beep();
        } finally {
            // schedule the cursor to revert after
            // the paint has happended.
            url = null;
            SwingUtilities.invokeLater(this);
        }
        }
    }

    URL url;
    Cursor cursor;
    }

}