Text Editor

January 02, 2021

Text Editor

Pada projek kali ini saya membuat sebuah text editor yang dimana cara kerja text editor ini tidak jauh dari aplikasi notepad yang dapat mengedit sebuah file dalam bentuk text. Di dalam program bisa membuka file yang sudah dibuat sebelumnya, membuat file yang baru, dan menyimpan file yang telah di edit atau baru saja dibuat. Untuk membuat program tersebut diagram classnya :

Source Code :

	import javax.swing.*;
	import java.awt.*;
	import java.awt.event.*;
	import java.util.Scanner;
	import java.io.*;

	public class Notepad extends JFrame implements ActionListener {
	private TextArea textArea = new TextArea("", 0,0, TextArea.SCROLLBARS_VERTICAL_ONLY);
	private MenuBar menuBar = new MenuBar(); // menu bar
	private Menu file = new Menu(); // menu file
	private MenuItem openFile = new MenuItem(); // open option
	private MenuItem saveFile = new MenuItem(); // save option
	private MenuItem close = new MenuItem(); // close option
	private MenuItem newFile = new MenuItem(); // new option

	public Notepad() {
	this.setSize(500, 300); // window's size
	this.setTitle("Java Text Editor"); // window's title
	setDefaultCloseOperation(EXIT_ON_CLOSE); // close button
	this.textArea.setFont(new Font("Century Gothic", Font.BOLD, 12)); // font in TextArea
	this.getContentPane().setLayout(new BorderLayout());
	this.getContentPane().add(textArea);

	// adds menu bar in gui
	this.setMenuBar(this.menuBar);
	this.menuBar.add(this.file);

	// adds file menu
	this.file.setLabel("File");

	// open option
	this.openFile.setLabel("Open"); // label
	this.openFile.addActionListener(this);
	this.openFile.setShortcut(new MenuShortcut(KeyEvent.VK_O, false)); // shortcut ctrl + o
	this.file.add(this.openFile); // putting open option into file menu

	// save option
	this.saveFile.setLabel("Save");
	this.saveFile.addActionListener(this);
	this.saveFile.setShortcut(new MenuShortcut(KeyEvent.VK_S, false)); // shortcut ctrl + s
	this.file.add(this.saveFile);

	// close option
	this.close.setLabel("Close");
	this.close.setShortcut(new MenuShortcut(KeyEvent.VK_F4, false));
	this.close.addActionListener(this);
	this.file.add(this.close);

	// new option
	this.newFile.setLabel("New");
	this.newFile.addActionListener(this);
	this.newFile.setShortcut(new MenuShortcut(KeyEvent.VK_N, false)); // shortcut ctrl + n
	this.file.add(this.newFile);
	}

	public void actionPerformed (ActionEvent e) {
	// if we pick close option
	if (e.getSource() == this.close)
	this.dispose(); //the data inside the session will be erased and the application will stop working

	// if we pick open option
	else if (e.getSource() == this.openFile) {
	JFileChooser open = new JFileChooser(); // opening file chooser (a dialog will be shown to choose a file)
	int option = open.showOpenDialog(this);
	if (option == JFileChooser.APPROVE_OPTION) {
	this.textArea.setText(""); // cleans the textarea before opening a new file
	try {
	// making a scanner that will read the file (getSelectedFile().getPath() will get the path to the file)
	Scanner scan = new Scanner(new FileReader(open.getSelectedFile().getPath()));
	while (scan.hasNext()) //
	this.textArea.append(scan.nextLine() + "\n");
	} catch (Exception ex) {
	System.out.println(ex.getMessage());
	}
	}
	}

	// if we pick save option
	else if (e.getSource() == this.saveFile) {
	JFileChooser save = new JFileChooser(); // opening file chooser
	int option = save.showSaveDialog(this); // same as open option but we call showSaveDialog
	if (option == JFileChooser.APPROVE_OPTION) {
	try {
	BufferedWriter out = new BufferedWriter(new FileWriter(save.getSelectedFile().getPath()));
	out.write(this.textArea.getText()); // writing a content inside TextArea to file
	out.close();
	} catch (Exception ex) {
	System.out.println(ex.getMessage());
	}
	}
	}

	// if we pick new option
	else if (e.getSource() == this.newFile) {
	textArea.setText("");
	}
	}
	// main method
	public static void main(String args[]) {
	Notepad app = new Notepad();
	app.setVisible(true);
	}
	}