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

public class DirectoryList extends Frame
    implements ActionListener {
  TextArea text;
  List list;

  public DirectoryList(String[] files) {
    super("DirectoryList Window");
    setSize(400, 500);
    list = new List(10, false);
    list.addActionListener(this);
    for (int i = 0; i < files.length; i++)
      list.add(files[i]);
    add(list, BorderLayout.NORTH);

    add(text = new TextArea(10, 40),
      BorderLayout.CENTER);

    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent event) {
        setVisible(true);
        dispose();
        System.exit(0);
      }
    });
  }

  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == list) {
      String item = list.getSelectedItem();
      if (item != null && item.length() > 0)
        displayFile(item);
    }
  }

  public void displayFile(String fileName) {
    FileReader f = null;
    BufferedReader br = null;
    try {
      f = new FileReader(fileName);
      br = new BufferedReader(f);
    } catch (IOException e) {
      text.append("Cannot open file: " + fileName);
    }
    try {
      String line = br.readLine();
      while (line != null) {
        text.append(line + "\n");
        line = br.readLine();
      }
    }
    catch (EOFException e) {
      // no problem, end of file here
    }
    catch (IOException e) {
      text.append("IO error reading: " + fileName);
    }
  }
}