A simple Text Editor

ReadMe.Txt

A simple Text Editor in Java. The app will run as is. However, You will see in the code that there are icons in the code. In order to make these visible you will need to create a src folder. I called it Icons in my project. Once you do that the project will be fully functional.

TextEditor.java

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

public class TextEditor extends JFrame{
	
	//Base Variables
	private JTextArea area = new JTextArea(20,120);
	private JFileChooser dialog = new JFileChooser(System.getProperty("user.dir"));
	private String currentFile = "Untitled";
	private boolean changed = false;
	
	//keylistener
		private KeyListener k1 = new KeyAdapter(){
			public void keyPressed(KeyEvent e){
				changed = true;
				Save.setEnabled(true);
				SaveAs.setEnabled(true);
			}
		};
	
	private void readInFile(String fileName) {
		// TODO Auto-generated method stub
		try{
			FileReader r = new FileReader(fileName);
			area.read(r, null);
			r.close();
			currentFile = fileName;
			setTitle(currentFile);
			changed = false;
		}
		catch(IOException e){
			Toolkit.getDefaultToolkit().beep();
			JOptionPane.showMessageDialog(this, "Editor can't find the file called " + fileName);
		}
	}

	private void saveOld() {
		// TODO Auto-generated method stub
		if(changed){
			if(JOptionPane.showConfirmDialog(this, "Would you like to save " + currentFile + " ?", "Save", JOptionPane.YES_NO_OPTION)== JOptionPane.YES_OPTION)
				saveFile(currentFile);
		}
};

private void saveFileAs() {
	// TODO Auto-generated method stub
	if(dialog.showSaveDialog(null)==JFileChooser.APPROVE_OPTION)
		saveFile(dialog.getSelectedFile().getAbsolutePath());
}

private void saveFile(String fileName) {
	// TODO Auto-generated method stub
	try{
		FileWriter w = new FileWriter(fileName);
		area.write(w);
		w.close();
		currentFile = fileName;
		setTitle(currentFile);
		changed = false;
		Save.setEnabled(false);
	}
	catch(IOException e){
		
	}
};
	
	
	
	//set up actions
	//open
	Action Open = new AbstractAction("Open", new ImageIcon("Icons/open.gif")){
		public void actionPerformed(ActionEvent e){
			saveOld();
			if(dialog.showOpenDialog(null)==JFileChooser.APPROVE_OPTION)
			{
				readInFile(dialog.getSelectedFile().getAbsolutePath());
			}
		}};
		
		
	//save
		Action Save = new AbstractAction("Save", new ImageIcon("Icons/save.gif")){
			public void actionPerformed(ActionEvent e){
				if(!currentFile.equals("Untitled"))
					saveFile(currentFile);
				else
					saveFileAs();
			}};

			
	//saveas
			Action SaveAs = new AbstractAction("Save as..."){
				public void actionPerformed(ActionEvent e){
					saveFileAs();
				}
			};
			
	//quit
			Action Quit = new AbstractAction("Quit"){
				public void actionPerformed(ActionEvent e){
					saveOld();
					System.exit(0);
				}
			};
			
	//actionMap
			ActionMap m = area.getActionMap();
			Action Cut = m.get(DefaultEditorKit.cutAction);
			Action Copy = m.get(DefaultEditorKit.copyAction);
			Action Paste = m.get(DefaultEditorKit.pasteAction);

		
	
	//Constructor
	public TextEditor(){
		
		//JScrollPane
		area.setFont(new Font("Monospaced", Font.PLAIN, 12));
		JScrollPane scroll = new JScrollPane(area, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
		add(scroll, BorderLayout.CENTER);
		
		//JMenuBar
		JMenuBar JMB = new JMenuBar();
		setJMenuBar(JMB);
		JMenu file = new JMenu("File");
		JMenu edit = new JMenu("Edit");
		JMB.add(file);
		JMB.add(edit);

		//Set up File Tab
		//file.add(New);
		file.add(Open);
		file.add(Save);
		file.add(Quit);
		file.add(SaveAs);
		file.addSeparator();
		
		for(int i = 0; i < 4; i++)
			file.getItem(i).setIcon(null);
		
		edit.add(Cut);
		edit.add(Copy);
		edit.add(Paste);
		
		//Set up Edit Tab
		edit.getItem(0).setText("Cut");
		edit.getItem(1).setText("Copy");
		edit.getItem(2).setText("Paste");
		
		//JToolBar
		JToolBar tool = new JToolBar();
		add(tool, BorderLayout.NORTH);
		//tool.add(New);
		tool.add(Open);
		tool.add(Save);
		tool.addSeparator();
		
		JButton cut = tool.add(Cut), cop = tool.add(Copy), pas = tool.add(Paste);
		
		cut.setText(null); cut.setIcon(new ImageIcon("Icons/cut.gif"));
		cop.setText(null); cop.setIcon(new ImageIcon("Icons/copy.gif"));
		pas.setText(null); pas.setIcon(new ImageIcon("Icons/paste.gif"));
		
		Save.setEnabled(false);
		SaveAs.setEnabled(false);
		
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		pack();
		area.addKeyListener(k1);
		setTitle(currentFile);
		setVisible(true);
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new TextEditor();
	}

}