// Purpose.  JSplitPane, JTextArea, and document model demo

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JSplitPaneDemo {
   public static void main( String[] args ) {
      JFrame frame = new JFrame( "JSplitPane demo" );
      frame.addWindowListener( new WindowAdapter() {
         public void windowClosing( WindowEvent e ) { System.exit( 0 ); } } );
      String str = readFile( "JSplitPaneDemo.txt" );

      JTextArea first  = new JTextArea( str, 8, 40 );
      JTextArea second = new JTextArea( 8, 20 );
      JTextArea third  = new JTextArea( 8, 20 );

      // Register first's "model" with "views" second and third
      second.setDocument( first.getDocument() );
      third.setDocument( first.getDocument() );

      first.setLineWrap( true );  first.setWrapStyleWord( true );
      second.setLineWrap( true ); second.setWrapStyleWord( true );
      third.setLineWrap( true );  third.setWrapStyleWord( true );

      JSplitPane leftAndRight = new JSplitPane( JSplitPane.HORIZONTAL_SPLIT,
         new JScrollPane(second),
         new JScrollPane(third) );
      JSplitPane topAndBottom = new JSplitPane( JSplitPane.VERTICAL_SPLIT,
         new JScrollPane(first),
         leftAndRight );

      frame.getContentPane().add( topAndBottom, BorderLayout.CENTER );
      frame.pack();
      frame.setVisible( true );
   }

   private static String readFile( String fn ) {
      StringBuffer sb = new StringBuffer();
      try {
         BufferedReader br = new BufferedReader( new FileReader( fn ) );
         String s;
         while ((s = br.readLine()) != null)
            if (s.equals( "" )) sb.append( "\n\n" );
            else                sb.append( s + " " );
         br.close();
      } catch( Exception ex ) { System.out.println( ex ); } 
      return sb.toString();
   }
}