package examples;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;

import javax.swing.*;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.PlainDocument;

public class DocumentSharing {
	public static void main(String[] args) {
		JFrame f = new JFrame("Document Sharing");
		f.setLayout(new GridLayout(0,1));
		
		// Create two text areas and add them to the frame.
		final JTextArea top = new JTextArea();
		final JTextArea bottom = new JTextArea();
		f.add(top);
		f.add(bottom);
		
		final JToggleButton share = new JToggleButton();
		share.setAction(new AbstractAction("share") {
			public void actionPerformed(ActionEvent arg0) {
				// When the button is pushed, have them share documents.
				if (share.isSelected())
					bottom.setDocument(top.getDocument());
				else {
					Document d = bottom.getDocument();
					int length = d.getLength();
					Document d2 = new PlainDocument();
					try {
						d2.insertString(0, d.getText(0,length), null);
					} catch (BadLocationException e) {
						e.printStackTrace();
					}
					bottom.setDocument(d2);
				}
			}
		});
		f.add(share);

		f.pack();
		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

}