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package notepad;

import javax.swing.*;

import javax.swing.filechooser.FileNameExtensionFilter;

import java.io.*;

public class Main extends JFrame {

private static final long serialVersionUID = 1L;

private JMenuBar jmnMenu = null;

private JTextArea txtFile = null;

private File selectedFile = null;

private JFileChooser fileChooser;

private Main() {

super();

initialize();

this.setVisible(true);

}

public static void main(String[] args) {

new Main();

}

private void initialize() {

initializeFileChooser();

this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

this.setName("frmNotepad");

this.setContentPane(getTxtFile());

this.setJMenuBar(getJmnMenu());

this.setTitle("A Simple Notepad");

this.setSize(new java.awt.Dimension(800, 600));

}

private void initializeFileChooser() {

String currentDir = "";

try {

currentDir = System.getProperty("user.dir");

} catch (SecurityException se) {

se.printStackTrace();

}

fileChooser = new JFileChooser(currentDir);

fileChooser.setFileFilter(new FileNameExtensionFilter("Text File (TXT)", "TXT"));

}

private JMenuBar getJmnMenu() {

if (jmnMenu == null) {

jmnMenu = new JMenuBar();

jmnMenu.add(dosyaMenuOlustur());

}

return jmnMenu;

}

private JMenu dosyaMenuOlustur() {

JMenu jmFile = new JMenu("File");

JMenuItem jmi = new JMenuItem("New");

jmi.addActionListener(e -> newFile());

jmFile.add(jmi);

jmi = new JMenuItem("Open");

jmi.addActionListener(e -> {

try {

ac();

} catch (IOException ex) {

ex.printStackTrace();

}

});

jmFile.add(jmi);

jmi = new JMenuItem("Save");

jmi.addActionListener(e -> {

try {

save();

} catch (IOException ex) {

ex.printStackTrace();

}

});

jmFile.add(jmi);

jmi = new JMenuItem("Exit");

jmi.addActionListener(e -> System.exit(0));

jmFile.add(jmi);

return jmFile;

}

private void ac() throws IOException {

int ret = fileChooser.showDialog(null, "Open");

if (ret == JFileChooser.APPROVE_OPTION) {

selectedFile = fileChooser.getSelectedFile();

//Dosyayi ekrana yukleyelim

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(

new FileInputStream(selectedFile)));

StringBuilder content = new StringBuilder();

String line;

while ((line = bufferedReader.readLine()) != null) {

content.append(line).append("\n");

}

txtFile.setText(content.toString());

bufferedReader.close();

}

}

private void save() throws IOException {

if (selectedFile == null) {

//Once kaydedilecek dosya bilgisini alalim

int ret = fileChooser.showDialog(null, "Save");

if (ret == JFileChooser.APPROVE_OPTION) {

selectedFile = fileChooser.getSelectedFile();

}

}

//Daha sonra selectedFile uzerine kayit yapalim

String dosya = selectedFile.getAbsolutePath();

if (selectedFile.delete()) {

selectedFile = new File(dosya);

//Dolduralim

FileOutputStream fos = new FileOutputStream(selectedFile);

fos.write(txtFile.getText().getBytes());

fos.close();

}

}

private void newFile() {

selectedFile = null;

txtFile.setText("");

}

private JScrollPane getTxtFile() {

if (txtFile == null) {

txtFile = new JTextArea();

}

return new JScrollPane(txtFile);

}

}