Re: Problem with DocumentEvent.GetChange

On Dec 5 2008, 5:18 pm, Andrew Thompson <andrewtho...@gmail.com>
wrote:


Fair call, example follows. I'm sure it could be shorter, but this
compiles and should show what the problem is.

import java.util.ArrayList;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.*;
import javax.swing.*;

public class MainJFrame extends JFrame {

    public MainJFrame() {
        initComponents();
    AddListener();
    }

    @SuppressWarnings("unchecked")
    private void initComponents() {

        EditScrollPane = new javax.swing.JScrollPane();
        EditPane = new javax.swing.JTextPane();
        LogScrollPane = new javax.swing.JScrollPane();
        LogTextArea = new javax.swing.JTextArea();

        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        EditScrollPane.setViewportView(EditPane);

        LogTextArea.setColumns(20);
        LogTextArea.setRows(5);
        LogScrollPane.setViewportView(LogTextArea);

        GroupLayout layout = new GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(
            GroupLayout.Alignment.LEADING)
            .addGroup(GroupLayout.Alignment.TRAILING,
            layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(
                            GroupLayout.Alignment.TRAILING)
                    .addComponent(LogScrollPane,
                 GroupLayout.Alignment.LEADING,
                 GroupLayout.DEFAULT_SIZE,
                 380, Short.MAX_VALUE)
                    .addComponent(EditScrollPane,
                 GroupLayout.Alignment.LEADING,
                 GroupLayout.DEFAULT_SIZE,
                 380, Short.MAX_VALUE))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(
            GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(EditScrollPane,
                 GroupLayout.PREFERRED_SIZE,
                 232,
                 GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(LogScrollPane,
                 GroupLayout.PREFERRED_SIZE,
                 105,
                 GroupLayout.PREFERRED_SIZE)
                .addContainerGap(GroupLayout.DEFAULT_SIZE,
                    Short.MAX_VALUE))
        );

        pack();
    }

    private void AddListener() {
    try {
                Document doc = EditPane.getDocument();
                doc.addDocumentListener(new DocumentListener() {
                    public void changedUpdate(DocumentEvent e) {
                        logChange(e);
                    }

                    public void insertUpdate(DocumentEvent e) {
                        logChange(e);
                    }

                    public void removeUpdate(DocumentEvent e) {
                        logChange(e);
                    }

                    private void logChange(DocumentEvent e) {
                        StringBuffer s = new StringBuffer();
                        s.append(e.getType().toString() + ":");
                        if (e.getDocument()
                instanceof DefaultStyledDocument) {
                            try {
                                DefaultStyledDocument doc =
                    (DefaultStyledDocument)
                    e.getDocument();
                                s.append(doc.getText(
                        e.getOffset(),
                        e.getLength()));
                                ArrayList<Element> els =
                    new ArrayList<Element>();
                                GetAllElements(doc, els);
                                DocumentEvent.ElementChange chg
                    = null;
                                for (Element elem : els) {
                                    chg = e.getChange(elem);
                                    if (chg != null) {
                                        s.append("Found One!!"
                        + elem.getName());
                                        break;
                                    }
                                }
                            } catch (Exception ex) {
                                LogTextArea.append(
                    ex.getMessage());
                            }
                        }
                        LogTextArea.append(s.toString());
                    }
                });
            } catch (Exception e) {
                LogTextArea.append(e.getMessage());
            }

    }

    private void GetAllElements(Document doc,
                ArrayList<Element> array) {
        Element[] roots = doc.getRootElements();
        for (Element el : roots) {
            array.add(el);
            GetAllElements(el, array);
        }
    }

    private void GetAllElements(Element el,
                ArrayList<Element> array) {
        for (int i = 0; i < el.getElementCount(); i++) {
            array.add(el.getElement(i));
            GetAllElements(el.getElement(i), array);
        }
    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MainJFrame().setVisible(true);
            }
        });
    }

    private JTextPane EditPane;
    private JScrollPane EditScrollPane;
    private JScrollPane LogScrollPane;
    private JTextArea LogTextArea;

}