//TextEd.java
//a simple text editor

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

public class TextEd extends Frame{

  TextArea txtOutput = new TextArea(20, 40);
  Button cmdOpen = new Button("open");
  Button cmdSave = new Button("save");
  Button cmdQuit = new Button("quit");
  Panel pnlNorth = new Panel();
  HandleButtons hb = new HandleButtons();
  WindowCloser wc;
  
  public static void main(String args[]){
    TextEd te = new TextEd();
    te.setSize(200,200);
    te.pack();
    te.show();
  } // end main

  TextEd(){
    super("Simple Text editor");
    setLayout(new BorderLayout());
    add(pnlNorth, BorderLayout.NORTH);
    pnlNorth.setLayout(new FlowLayout());
    pnlNorth.add(cmdOpen);
    pnlNorth.add(cmdSave);
    pnlNorth.add(cmdQuit);

    cmdOpen.addActionListener(hb);
    cmdSave.addActionListener(hb);
    cmdQuit.addActionListener(hb);
    
    add(txtOutput, BorderLayout.CENTER);

    wc = new WindowCloser((Window)this);
    addWindowListener(wc);
  } // end constructor

  public void openFile(){
    //request a filename, and open the file
    FileDialog fd = new FileDialog(this, "open a file");
    fd.setMode(FileDialog.LOAD);
    fd.setDirectory(".");
    fd.setFile("*.txt");
    fd.show();
    File myFile = new File(fd.getFile());

    try {
      BufferedReader in = new BufferedReader(new FileReader(myFile));
      txtOutput.setText("");
      String line = "";
      while (line != null) {
        line = in.readLine();
        if (line != null) txtOutput.append(line + "\n");
      } // end while
      
      in.close();
      
    } catch (IOException e) {
      System.out.println(e.getMessage());
    } // end try
  }// end openFile

  public void saveFile(){
    //request a filename and save the file
    FileDialog fd = new FileDialog(this, "save the file");
    fd.setMode(FileDialog.SAVE);
    fd.setDirectory(".");
    fd.setFile("*.txt");
    fd.show();
    File myFile = new File(fd.getFile());

    try{
      PrintWriter out = new PrintWriter(new FileWriter(myFile));
      out.print(txtOutput.getText());
      out.close();
    } catch (IOException e){
      System.out.println(e.getMessage());
    } // end try
  } // end saveFile
  
  private class HandleButtons implements ActionListener{
    public void actionPerformed(ActionEvent e){
      if (e.getSource() == cmdOpen){
	openFile();
      } else if (e.getSource() == cmdSave){
	saveFile();
      } else if (e.getSource() == cmdQuit){
        dispose();
	System.exit(0);
      } //end if
    } // end actionPerformed
  } //end handleButtons

} // end classDef