Performance and rendering functionality of JEditorPane/JTextPane
is bad when trying to display any file larger than 100K.

JTextComponent --> JEditorPane --> JTextPane

Run the following code on any large text file greater than 100K or the attaced
text file. run with "java editorpane <filename>"
use the scroller to scroll through the text and you'll notice the rendering
problems along with performance of the scrlling window.....

import java.awt.*;
import java.io.*;
import java.beans.*;
import java.awt.event.*;
import com.sun.java.swing.*;
import com.sun.java.swing.event.*;
 
public class editorpane extends JEditorPane {
 
boolean ToolBarVisible = true;
 
JToolBar toolbar;
JScrollPane scroller;
JPanel panel;
JViewport vp;
 
        editorpane () {
        super();
        scroller = new JScrollPane(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
                        ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        vp = scroller.getViewport();
        vp.add(this);
        vp.setBackingStoreEnabled(true);
 
        panel = new JPanel();
        panel.setLayout(new BorderLayout());
        panel.add("Center", scroller);
        }
 
        public void OpenFile(String fileName) {
 
        Thread loader = new fileloader(fileName);
        loader.start();
 
        }
 
        class fileloader extends Thread {
        String file;
 
        fileloader(String myfile) {
                setPriority(3);
                file = myfile;
        }
 
        public void run() {
                File f = new File(file);
                try {
                Reader in = new FileReader(f);
                read(in, f);
                }
                catch (IOException e) {
                System.err.println(e.toString());
                }
            }
        }
 
   public static void main(String[] args) {
 
        try {
                UIManager myui = new UIManager();
               UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
                

      } catch (Exception exc) {
            System.err.println("Error loading L&F: " + exc);
        }
      f.pack();
      f.setSize(600, 400);
      f.setVisible(true);
 
      myeditor.setBackground(Color.white);
      myeditor.setFont(new Font("Courier", 0, 12));
      myeditor.OpenFile(args[0]);
   }
}

mehdi.ghazizadeh@eng 1998-09-18