/*FILE Viewer or more like any data window standalone viewer

Reminds me of Yahoo Chat box back in the day */

//Stand alone

//Author: M.Brohi

import java.awt.*;

import java.awt.event.*;

import java.io.*;

/* Class will create a GUI */

public class FileViewer extends Frame implements ActionListener {

String directory;

TextArea textarea;

public FileViewer() { this(null, null);}

public FileViewer(String filename) {this(null, filename); }

public FileViewer(String directory, String filename) {

super();

addWindowListener( new WindowAdapter() {

public void windowClosing(WindowEvent e) {dispose (); }

});

textarea = new TextArea("", 24, 80);

textarea.setFont(new Font( "Monospaced", Font.PLAIN, 12));

textarea.setEditable(false);

this.add(textarea, "Center");

Panel p = new Panel();

p.setLayout(new FlowLayout(FlowLayout.RIGHT, 10, 5));

this.add(p, "South");

Font font = new Font("SansSerif", Font.BOLD, 14);

Button openfile = new Button("Open File");

Button close = new Button("Close");

openfile.addActionListener(this);

openfile.setActionCommand("open");

openfile.setFont(font);

close.addActionListener(this);

close.setActionCommand("close");

close.setFont(font);

p.add(openfile);

p.add(close);

this.pack();

//Directory From Filename or Current Directory

if (directory == null) {

File f;

if ((filename != null) && (f = new File (filename)) .isAbsolute()) {

directory = f.getParent();

filename = f.getName();

}

else directory = System.getProperty("user.dir");

}

this.directory = directory;

setFile(directory, filename);

}

public void setFile(String directory, String filename) {

if (( filename == null) || (filename.length() == 0))

return;

File f;

FileReader in = null;

try {

f = new File(directory, filename);

in = new FileReader(f);

char[] buffer = new char[4096];

int len;

textarea.setText("");

while((len = in.read(buffer)) != -1) {

String s = new String(buffer, 0 ,len);

textarea.append(s);

}

this.setTitle("FileViewer: " + filename);

textarea.setCaretPosition(0);

}

catch (IOException e) {

textarea.setText(e.getClass().getClass().getName() + ": " + e.getMessage());

this.setTitle("FileViewer: " + filename + " : I/O Exception");

}

finally { try { if (in!= null) in.close(); } catch (IOException e) {} }

}

@SuppressWarnings("deprecation")

public void actionPerformed(ActionEvent e) {

String cmd = e.getActionCommand();

if (cmd.contentEquals("open")) {

FileDialog f = new FileDialog(this, "Open File", FileDialog.LOAD);

f.setDirectory(directory);

f.show();

directory = f.getDirectory();

setFile(directory, f.getFile());

f.dispose();

}

else if (cmd.equals ("close"))

this.dispose();

}

static public void main(String[] args) throws IOException {

Frame f = new FileViewer ((args.length == 1) ?args[0]:null);

f.addWindowListener(new WindowAdapter() {

public void windowClosed( WindowEvent e) {

System.exit(0);}

});

f.show();

}

}