Re: Problem with DocumentEvent.GetChange

In article
<6332e879-ea0d-42bf-aeab-86e07e3d2020@x16g2000prn.googlegroups.com>,
 mick.heywood@gmail.com wrote:


[...]


[...]


Try this. I modified your example for compatibility and style: 1.5,
case, layout, StringBuilder, etc. I re-factored your getAllXXX methods,
which were coming up empty.

OT: For some reason the document element "bidi" (bi-directional text)
always reminds me of the homonymous Hindi word:

<http://en.wikipedia.org/wiki/Beedi>

<sscce>
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;

public class MainJFrame extends JFrame {

    private JTextPane editPane = new javax.swing.JTextPane();
    private JScrollPane editScroll = new javax.swing.JScrollPane();
    private JTextArea logArea = new javax.swing.JTextArea();
    private JScrollPane logScroll = new javax.swing.JScrollPane();

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

    private void initComponents() {

        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        editPane.setPreferredSize(new Dimension(0, 60));
        editScroll.setViewportView(editPane);
        logArea.setColumns(32);
        logArea.setRows(24);
        logScroll.setViewportView(logArea);
        
        this.add(editScroll, BorderLayout.NORTH);
        this.add(logScroll, BorderLayout.CENTER);

        pack();
    }

    private void addListener() {
        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) {
                StringBuilder s = new StringBuilder();
                s.append(e.getType());
                s.append(": ");
                Document doc = e.getDocument();
                try {
                    int offset = e.getOffset();
                    int length = e.getLength();
                    s.append(doc.getText(offset, length));
                    s.append(" at [");
                    s.append(offset);
                    s.append(",");
                    s.append(length);
                    s.append("]\n");
                    List<Element> eList = getAllElements(doc);
                    for (Element elem : eList) {
                        s.append("Found: ");
                        s.append(elem.getName());
                        s.append("\n");
                    }
                } catch (Exception ex) {
                    logArea.append(ex.getMessage());
                }
                logArea.append(s.toString());
            }
        });
    }

    private List<Element> getAllElements(Document doc) {
        List<Element> list = new ArrayList<Element>();
        Element[] roots = doc.getRootElements();
        for (Element root : roots) {
            list.add(root);
            getAllChildren(root, list);
        }
        return list;
    }

    private void getAllChildren(Element root, List<Element> list) {
        for (int i = 0; i < root.getElementCount(); i++) {
            list.add(root.getElement(i));
            getAllChildren(root.getElement(i), list);
        }
    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new MainJFrame().setVisible(true);
            }
        });
    }
}
</sscce>

--
John B. Matthews
trashgod at gmail dot com
http://home.roadrunner.com/~jbmatthews/