import java.awt.*;
import javax.swing.*;



public class OnScreenKeyboard implements ActionListener {

JFrame keyboard;
static String keyboardKeys = "0123456789qwertyuiopasdfghjklzxcvbnm.< ";
JButton[] keys = new JButton[39];
GridLayout gl;
FlowLayout fl;
Dimension buttondimension;
JPanel panel1, panel2;

JToggleButton capslock;
private String message = "";

public String getMessage() {
    return message;
}

public void setMessage(String message) {
    this.message = message;
}

public OnScreenKeyboard() {
    buttondimension = new Dimension(45, 40);

    fl = new FlowLayout();

    capslock = new JToggleButton("capslock");

    panel1 = new JPanel(fl);
    panel2 = new JPanel(fl);

    char[] key = keyboardKeys.toCharArray();

    for (int i = 0; i < 39; i++) {
        keys[i] = new JButton(String.valueOf(key[i]));
        keys[i].setFont(new Font("Arial", Font.PLAIN, 13));
        if (i == 38) {
            keys[i].setPreferredSize(new Dimension(100, 30));
        } else {

            keys[i].setPreferredSize(buttondimension);
        }
        keys[i].addActionListener(this);
    }

    keyboard = new JFrame("Keyboard");
    keyboard.setSize(720, 220);
    keyboard.setLocationRelativeTo(null);
    keyboard.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    keyboard.setResizable(false);

    Container content = keyboard.getContentPane();
    content.setLayout(null);
    panel1.setBounds(1, 1, 500, 210);
    panel2.setBounds(510, 1, 200, 210);

    for (int i = 0; i < 10; i++) {
        panel2.add(keys[i]);
    }
    for (int i = 10; i < 39; i++) {
        panel1.add(keys[i]);
    }

    panel1.add(capslock);

    content.add(panel1);
    content.add(panel2);

    capslock.addActionListener(this);

    keyboard.setVisible(true);
}

public static void main(String[] args) {
    new OnScreenKeyboard();

}

public void reset(){
    message = "";
}

@Override
public void actionPerformed(ActionEvent e) {

    for (int i = 0; i < 36; i++) {
        if (e.getSource() == keys[i]) {
            setMessage(getMessage() + keys[i].getText());
            break;
        }
    }

    if (e.getSource() == capslock) {
        if (capslock.isSelected()) {
            for (int i = 10; i < 36; i++) {
                keys[i].setFont(new Font("Arial", Font.PLAIN, 12));
                keys[i].setText(keys[i].getText().toUpperCase());

            }
        } else if (!capslock.isSelected()) {
            for (int i = 10; i < 36; i++) {
                keys[i].setFont(new Font("Arial", Font.PLAIN, 13));
               keys[i].setText(keys[i].getText().toLowerCase());

            }
        }
    }

    setMessage(getMessage());

    //JOptionPane.showMessageDialog(null, getMessage());

}

}

public class LoginScreen implements ActionListener, FocusListener {

JFrame frame;
Container content;
FlowLayout fl;

JTextField txtusername, txtpassword;
JLabel lblusername, lblpassword;

JPanel panel1, panel2;

JButton keyboard, signup, signin;
OnScreenKeyboard kyb;
Dimension text;

private void init() {
    text =new Dimension(100, 30);

    fl = new FlowLayout(FlowLayout.CENTER);
    lblusername = new JLabel("enter username");
    lblpassword = new JLabel("enter password");
    txtusername = new JTextField();
    txtpassword = new JPasswordField();

    keyboard = new JButton("keyboard");
    signup = new JButton("signup");
    signin = new JButton("sign in");

    panel1 = new JPanel(fl);
    panel2 = new JPanel(fl);

    keyboard = new JButton("keyboard");

    txtusername.setPreferredSize(text);
    txtpassword.setPreferredSize(text);

    kyb = new OnScreenKeyboard();

}

public LoginScreen() {

    init();
    frame = new JFrame("BorderLayoutDemo");
    frame.setTitle("Registration Form");
    frame.setSize(300, 300);
    frame.setDefaultCloseOperation(3);

    frame.setLocationRelativeTo(null);
    frame.setVisible(true);

    content = frame.getContentPane();

    content.setLayout(new GridLayout(2, 1));

    panel1.add(lblusername);
    panel1.add(txtusername);
    panel1.add(lblpassword);
    panel1.add(txtpassword);

    panel2.add(signup);
    panel2.add(signin);
    panel2.add(keyboard);

    content.add(panel1);
    content.add(panel2);
    keyboard.addActionListener(this);

    txtusername.addFocusListener(this);
    txtpassword.addFocusListener(this);

}

public static void main(String[] args) {
    new LoginScreen();
}

@Override
public void actionPerformed(ActionEvent e) {

    if (!kyb.keyboard.isVisible()) {
        if (e.getSource() == keyboard) {
            kyb = new OnScreenKeyboard();
        }
    }

}


@Override
public void focusGained(FocusEvent e) {
   if(txtusername == e.getSource()){
       txtusername.setText(kyb.getMessage());

   }else if(txtpassword == e.getSource()){

       kyb.reset();
       txtpassword.setText(kyb.getMessage());
   }
}

@Override
public void focusLost(FocusEvent e) {
}