/*  HelpDialog.java   (P)2002 Dana Cristofor*//*GAClust - Clustering categorical databases using genetic algorithmsCopyright (C) 2002  Dana CristoforThis program is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 2 of the License, or (atyour option) any later version.This program is distributed in the hope that it will be useful, butWITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNUGeneral Public License for more details.You should have received a copy of the GNU General Public Licensealong with this program; if not, write to the Free SoftwareFoundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307USAGAClust was written by Dana Cristofor (dana@cs.umb.edu).*/import javax.swing.*;import javax.swing.tree.*;import javax.swing.event.*;import javax.swing.text.html.*;import java.awt.*;import java.awt.event.*;import java.io.IOException;import java.net.URL;/** * A help dialog * * @version 	1.0 * @author	Dana Cristofor */public class HelpDialog extends CenteredJDialog implements HyperlinkListener{  // Variables declaration  private JSplitPane MainSplitPane;  private JScrollPane TopicsScrollPane;  private JTree TopicsTree;  private JScrollPane ViewScrollPane;  private JEditorPane ViewEditorPane;  private URL homeURL;  // End of variables declaration  /** Creates new form HelpDialog */  public HelpDialog(Frame parent, boolean modal)   {    super(parent, modal);    initComponents();  }  /** This method is called from within the constructor to   * initialize the form.   */  private void initComponents()   {    setTitle(Strings.TOPICS);    setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);    setModal(true);    addWindowListener(new WindowAdapter() {	public void windowClosing(WindowEvent evt) {	  closeDialog();	}      });    // Create the nodes.    DefaultMutableTreeNode top      = new DefaultMutableTreeNode(Strings.TITLE + Strings.space				   + Strings.TOPICS);    createNodes(top);    // Create a tree that allows one selection at a time.    TopicsTree = new JTree(top);    TopicsTree.getSelectionModel().setSelectionMode      (TreeSelectionModel.SINGLE_TREE_SELECTION);    // Listen for when the selection changes.    TopicsTree.addTreeSelectionListener(new TreeSelectionListener() {	public void valueChanged(TreeSelectionEvent e) {	  DefaultMutableTreeNode node = (DefaultMutableTreeNode)	    TopicsTree.getLastSelectedPathComponent();	  if (node == null)	    return;	  Object nodeInfo = node.getUserObject();	  if (node.isLeaf())	    {	      TopicInfo topic = (TopicInfo)nodeInfo;	      displayURL(topic.topicURL);	    }	  else	    displayURL(homeURL); 	}      });    TopicsScrollPane = new JScrollPane(TopicsTree);    ViewEditorPane = new JEditorPane();    ViewEditorPane.setEditable(false);    ViewEditorPane.addHyperlinkListener(this);    initHelp();    ViewScrollPane = new JScrollPane(ViewEditorPane);    MainSplitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);    MainSplitPane.setOneTouchExpandable(true);    MainSplitPane.setTopComponent(TopicsScrollPane);    MainSplitPane.setBottomComponent(ViewScrollPane);    Dimension min_dim = new Dimension(100, 50);    TopicsScrollPane.setMinimumSize(min_dim);    ViewScrollPane.setMinimumSize(min_dim);    MainSplitPane.setDividerLocation(150);    MainSplitPane.setPreferredSize(new Dimension(800, 400));    getContentPane().add(MainSplitPane, BorderLayout.CENTER);    pack();    center();  }  // this method makes a URL for a given filename  private URL makeURL(String filename)  {    try       {	String s = "file:" 	  + System.getProperty("user.dir")	  + System.getProperty("file.separator")	  + Strings.HELP_DIR	  + System.getProperty("file.separator")	  + filename;	return new URL(s);      }    catch (Exception e)      {	System.err.println(Strings.UNXP_ERROR + "makeURL(): "				     + e + Strings.endl);	return null;      }  }  private void initHelp()   {    try       {	homeURL = makeURL(Strings.INTRO_HTML);	displayURL(homeURL);      }     catch (Exception e)       {	System.err.println(Strings.UNXP_ERROR + "initHelp(): "			   + e + Strings.endl);      }  }  private void displayURL(URL url)   {    try       {	ViewEditorPane.setPage(url);      }     catch (IOException e)       {	System.err.println(Strings.UNXP_ERROR + "displayURL(): "			   + e + Strings.endl);      }  }  private class TopicInfo   {    public String topicName;    public URL topicURL;    public TopicInfo(String topic, String filename)     {      topicName = topic;      topicURL = makeURL(filename);    }    public String toString()    {      return topicName;    }  }  private void createNodes(DefaultMutableTreeNode top)   {    DefaultMutableTreeNode category = null;    DefaultMutableTreeNode topic = null;    ////////    // Intro    category = new DefaultMutableTreeNode(Strings.INTRO_TITLE);    top.add(category);    // definitions    topic = new DefaultMutableTreeNode(new TopicInfo(Strings.DEFS_TITLE,						     Strings.DEFS_HTML));    category.add(topic);    // references    topic = new DefaultMutableTreeNode(new TopicInfo(Strings.REFERENCE_TITLE,						     Strings.REFERENCE_HTML));    category.add(topic);    /////////    // Manual    category = new DefaultMutableTreeNode(Strings.MANUAL_TITLE);    top.add(category);    /*    // overview    topic = new DefaultMutableTreeNode(new TopicInfo(Strings.OVERVIEW_TITLE,						     Strings.OVERVIEW_HTML));    category.add(topic);    */    // user guide    topic = new DefaultMutableTreeNode(new TopicInfo(Strings.USER_GUIDE_TITLE,						     Strings.USER_GUIDE_HTML));    category.add(topic);    /*    // technical information    topic = new DefaultMutableTreeNode(new TopicInfo(Strings.MISC_INFO_TITLE,						     Strings.MISC_INFO_HTML));    category.add(topic);    */  }  /** Closes the dialog */  private void closeDialog()   {    setVisible(false);    dispose();  }  /** Called when a hypertext link is updated */  public void hyperlinkUpdate(HyperlinkEvent e)   {    if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED)       {	displayURL(e.getURL());      }  }}