import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class TextDisplay {
    protected JFrame frame;           // The frame that holds the display and key panels
    protected JTextArea display;      // This holds the text
    JScrollPane textPane;             // JTextArea is wrapped in this to get scrolling 

    /**
     * The constructor builds the window, prepares it for use, and displays it.
     */
    public TextDisplay() {

        // Build the overall frame
        frame = new JFrame("Output Window");
        frame.setBackground(Color.LIGHT_GRAY);
        frame.setSize(500,300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());

        // Text is displayed in a scrolling pane in the CENTER of the border layout
        display = new JTextArea();
        display.setEditable(false);
        display.setLineWrap(true);
        display.setWrapStyleWord(true);
        display.setFont(new Font("Courier", Font.PLAIN, 14));
        textPane = new JScrollPane(display); // Wrap TextArea in a ScrollPane

        // Finally, add everything to the frame and make it visible
        frame.add(textPane, BorderLayout.CENTER);
        frame.setVisible(true);
    }

    /**
     * Call this method to append text to the scrolling pane.  No newlines are added,
     * so be sure to include a "\n" where desired.
     * 
     * @param msg  Text to add to the scrolling pane
     */
    public void print(String msg) {
        display.append(msg);
        //textPane.getVerticalScrollBar().setValue(Integer.MAX_VALUE);
    }

    /**
     * Call this method to append text to the scrolling pane.  A newline
     * is added at the end of the message.
     * 
     * @param msg  Text to add to the scrolling pane
     */
    public void println(String msg) {
        display.append(msg+"\n");
        //textPane.getVerticalScrollBar().setValue(Integer.MAX_VALUE);
    }

}