AppendingTextPane.java Source code

Introduction

Here is the source code for AppendingTextPane.java

Source

/*
Core SWING Advanced Programming 
By Kim Topley
ISBN: 0 13 083292 8       
Publisher: Prentice Hall  
*/

import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.StyledDocument;

public class AppendingTextPane extends JTextPane {
    public AppendingTextPane() {
        super();
    }

    public AppendingTextPane(StyledDocument doc) {
        super(doc);
    }

    // Appends text to the document and ensure that it is visible
    public void appendText(String text) {
        try {
            Document doc = getDocument();

            // Move the insertion point to the end
            setCaretPosition(doc.getLength());

            // Insert the text
            replaceSelection(text);

            // Convert the new end location
            // to view co-ordinates
            Rectangle r = modelToView(doc.getLength());

            // Finally, scroll so that the new text is visible
            if (r != null) {
                scrollRectToVisible(r);
            }
        } catch (BadLocationException e) {
            System.out.println("Failed to append text: " + e);
        }
    }

    // Testing method
    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
        } catch (Exception evt) {
        }

        JFrame f = new JFrame("Text Pane with Scrolling Append");
        final AppendingTextPane atp = new AppendingTextPane();
        f.getContentPane().add(new JScrollPane(atp));
        f.setSize(200, 200);
        f.setVisible(true);

        // Add some text every second
        Timer t = new Timer(1000, new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                String timeString = fmt.format(new Date());
                atp.appendText(timeString + "\n");
            }

            SimpleDateFormat fmt = new SimpleDateFormat("HH:mm:ss");
        });
        t.start();
    }
}