JTextArea中显示LineNumber
2008-01-05 20:23:52 来源:WEB开发网//package tryLineNumber;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
//import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
/**
* A class illustrating running line number count on JTextPane. Nothing
is painted on the pane itself,
* but a separate JPanel handles painting the line numbers.<br>
*
* @author Daniel Sj?blom<br>
* Created on Mar 3, 2004<br>
* Copyright (c) 2004<br>
* @version 1.0<br>
*/
public class LineNr extends JPanel
{
// for this simple experiment, we keep the pane + scrollpane as members.
//JTextPane pane;
JTextArea pane;
JScrollPane scrollPane;
public LineNr()
{
super();
setMinimumSize(new Dimension(30, 30));
setPReferredSize(new Dimension(30, 30));
setMinimumSize(new Dimension(30, 30));
//pane = new JTextPane() // we need to override paint so that the linenumbers stay in sync
pane = new JTextArea()
{
public void paint(Graphics g)
{
super.paint(g);
LineNr.this.repaint();
}
};
scrollPane = new JScrollPane(pane);
Tags:JTextArea 显示 LineNumber
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