/**
 * Simple demonstration class to show how to display a text
 * file in a JTextPane in a Swing program using a JFileChooser
 *
 * @author  David Mitchell, dave@dmdata.com
 * @version 1.0
 * @see http://www.dbmdata.com
 */

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

/**
 *
 *
 * @author David Mitchell, dave@dbmdata.com
 * @version 1.0
 * @see http://www.dbmdata.com
 */
public class FileReaderWindow extends JFrame
{

	// declare GUI variables
	public Container c;
	private BorderLayout m_brd;
	private JPanel mainPanel;
	public BorderLayout brd;

	// for the textpane window
	public JTextPane textPane;
	private JScrollPane textScroll;

	// for the control buttons
	private JPanel controlPanel;
	private JButton btnOpen;
	private JButton btnQuit;

	/**
	 * Class constructor
	 * Start building some of the Swing GUI elements
 	 *
	 * @param
	 * @return
	 * @exception
	 *
	 * @see
	 */
	public FileReaderWindow()
	{
		super("FileReaderWindow");

		c = getContentPane();

		// set up the main panel that will contain the entire interface
		m_brd = new BorderLayout();
		mainPanel = new JPanel();
		mainPanel.setLayout(m_brd);

		textPane = new JTextPane();
		textScroll = new JScrollPane(textPane);
		textScroll.setPreferredSize(new Dimension(300, 300));

		controlPanel = buildControlPanel();
		mainPanel.add(textScroll, m_brd.CENTER);

		brd = new BorderLayout();
		c.setLayout(brd);

		// start listening for events now that the interface is showing
		addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent we)
			{
				System.exit(0);
			}
   		});


		c.add(mainPanel, brd.CENTER);
		c.add(controlPanel, brd.SOUTH);

		pack();
		show();

	}

	/**
	 *
	 * builds a panel of buttons to add to the main panel
	 * and returns it to the the Constructor
	 *
	 * @param none
	 * @return tempControlPanel
	 * @exception none
	 *
	 * @see
	 */
	private JPanel buildControlPanel()
	{
		JPanel tempControlPanel = new JPanel();

		btnOpen = new JButton("Open File");
		btnQuit= new JButton("Quit");

		tempControlPanel.add(btnOpen);
		tempControlPanel.add(btnQuit);

		/**
		* Event handler for "Open" button
		* will call the method to display the JFileChooser
		*/
		btnOpen.addActionListener (new ActionListener()
		{
			public void actionPerformed (ActionEvent e)
			{
				showFileChooser();
			}
		});

		/**
		* Event handler for "quit" button
		*/
		btnQuit.addActionListener (new ActionListener()
		{
			public void actionPerformed (ActionEvent e)
			{
				System.exit(0);
			}
		});

		return tempControlPanel;
	}

	/**
	 * displays JFileFileChooser and grabs the selected file
	 *
	 * @param
	 * @return
	 * @exception
	 *
	 * @see
	 */
	 public void showFileChooser()
		{
			JFileChooser fc = new JFileChooser();
			int retr = fc.showOpenDialog(this);
			File selectedFile = null;
			if (retr == JFileChooser.APPROVE_OPTION)
			{
			   selectedFile = fc.getSelectedFile();
			}

			// instantiate the FileRead class which will open the file, read it
			// and place it's contents into the textPane
			FileRead fr = new FileRead(selectedFile, this);
	}


	/**
	 * Main method - start program
	 *
	 * @param
	 * @return
	 * @exception
	 *
	 * @see
	 */
	 public static void main (String[] args)
	 {
		FileReaderWindow remote = new FileReaderWindow();
	 }

}