keyboard action of my JButton

[jhon max]

hi, I need some help about this user entry phase of my program (password prompting)

  public class PasswordField extends JFrame {

    private JPanel passwordPanel;
    
    private JTextField userNameField;

    private JPasswordField passwordField;

    private JLabel userNameLabel;
    private JLabel passwordLabel;

    private JButton userConfirmationBtn;
    
    private Image icon;
    
    private ImageIcon frameBackground;
    private ImageIcon buttonBackground;
    
    public PasswordField() {

        initComponents();
    }

    private void initComponents() {

        icon = new ImageIcon("c:/pics/mercuryLogo.jpg").getImage().getScaledInstance(300, 300, 0);
        frameBackground = new ImageIcon("c:/pics/passwordbck2.jpg");
        buttonBackground = new ImageIcon("c:/pics/buttonbck");
        userNameField = new JTextField();
        passwordField = new JPasswordField();
        userNameLabel = new JLabel("User Name : ");
        passwordLabel = new JLabel("Password : ");
        userConfirmationBtn = new JButton("Ok");
        
        // set the properties of this label
        userNameLabel.setBounds(20, 20, 200, 20);
        userNameLabel.setFont(new Font("Monospaced", Font.BOLD, 12));
        userNameLabel.setForeground(Color.BLACK);

        // set the properties and actions of this text field
        userNameField.setBounds(120, 20, 200, 20);
        
        // set the properties of this label
        passwordLabel.setBounds(28, 50, 200, 20);
        passwordLabel.setFont(new Font("Monospaced", Font.BOLD, 12));
        passwordLabel.setForeground(Color.BLACK);

        // set the properties and actions of this text field
        passwordField.setBounds(120, 50, 200, 20);

        // set the properties and actions of this button
        Action pass = new AbstractAction() {

            public void actionPerformed(ActionEvent e) {

                System.out.println("Access Granted");
            }
        };
        userConfirmationBtn.addActionListener(pass);
        userConfirmationBtn.setBounds(150, 90, 70, 20);
        userConfirmationBtn.setFont(new Font("Monospaced", Font.BOLD, 11));
        userConfirmationBtn.setBackground(Color.LIGHT_GRAY);
        userConfirmationBtn.registerKeyboardAction(userConfirmationBtn.getActionForKeyStroke(
                                        KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, false)),
                                        KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, false),
                                        JComponent.WHEN_FOCUSED);
        userConfirmationBtn.registerKeyboardAction(userConfirmationBtn.getActionForKeyStroke(
                                        KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, true)),
                                        KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true),
                                        JComponent.WHEN_FOCUSED);
        
        
        passwordPanel = new JPanel() {

            @Override
            protected void paintComponent(Graphics g) {

                // Scale image to size of component
                Dimension d = getSize();

                g.drawImage(frameBackground.getImage(), 0, 0, d.width, d.height, null);

                super.paintComponent(g);
            }
        };
        passwordPanel.setOpaque(false);

        // set this panel's layout to null for absolute positioning of
        // components
        passwordPanel.setLayout(null);
        
        // add the components to this panel
        passwordPanel.add(userNameLabel);
        passwordPanel.add(passwordLabel);
        passwordPanel.add(userNameField);
        passwordPanel.add(passwordField);
        passwordPanel.add(userConfirmationBtn);

        // add the panel to the container
        getContentPane().add(passwordPanel);
        
        setTitle(" User Confirmation");
        setIconImage(icon);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(350, 160);
        setResizable(false);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public static void main(String[] args) {

        SwingUtilities.invokeLater(new Runnable() {
            
            public void run() {

                new PasswordField();
            }
        });
    }
}
  

I'm having some problem regarding with the keyboard press with my jbutton inside the frame.
I dont have any problems with the keyboard event.. but the problem is in the "focus"(i dont know if that is the best word to express the problem),

anyway the problem is, when i press the button the "focus" is starting on the text field(well ofcourse it will start on the first component), so when i press the "Enter" key, the button doesnt fire any keyboard event
i have to go through the two textfields first before i can fire the keyboard event of my button.

What I want is, even the "focus" is in either of the textfields, when i press the button it will automatically fires the keyboard event that i want...

I hope you understand my concern, sorry for bad expression of my problem(bad english)
Please I desperately need some help about this. Thanks in advance!

[Karthick Dharani Vidhya]

in line number 63 and 67, when registering the key board action, use JComponent.WHEN_IN_FOCUSED_WINDOW. Please see the code below.

      userConfirmationBtn.registerKeyboardAction(userConfirmationBtn.getActionForKeyStroke(
                                      KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, false)),
                                      KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, false),
                                      JComponent.WHEN_IN_FOCUSED_WINDOW);
      userConfirmationBtn.registerKeyboardAction(userConfirmationBtn.getActionForKeyStroke(
                                      KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, true)),
                                      KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true),
                                      JComponent.WHEN_IN_FOCUSED_WINDOW);

Not sure if this is what you needed. Please do this change and see if this gives you the expected behaviour.

[jhon max]

oh sir.. how can I thank you for that one .. thats a VERY BIG help ..! thank you so much!!! thank you thank you! ... that solved my problem !! thank you!

[jhon max]

   public class PasswordField extends JFrame {

    private JPanel passwordPanel;

    private JPasswordField passwordField;

    private JLabel passwordLabel;

    private JButton userConfirmationBtn;
    private JButton submenu;
    
    private Image icon;
    
    private ImageIcon frameBackground;
    private ImageIcon buttonBackground;

    private String passwordAuthentication;
    
    public PasswordField() {


        initComponents();
    }

    private void initComponents() {

        icon = new ImageIcon("c:/pics/mercuryLogo.jpg").getImage().getScaledInstance(300, 300, 0);
        frameBackground = new ImageIcon("c:/pics/passwordbck2.jpg");
        buttonBackground = new ImageIcon("c:/pics/buttonbck");
        passwordField = new JPasswordField();
        passwordLabel = new JLabel("Password : ");
        userConfirmationBtn = new JButton("Enter");
        submenu = new JButton("Submenu");
        
        // set the properties of this label
        passwordLabel.setBounds(15, 13, 80, 20);
        passwordLabel.setFont(new Font("Monospaced", Font.BOLD, 12));
        passwordLabel.setForeground(Color.BLACK);

        
        // set the properties and actions of this text field
        passwordField.setBounds(95, 13, 185, 20);
        passwordField.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {

            }
        });

        // set the properties and actions of this button
        Action pass = new AbstractAction() {

            public void actionPerformed(ActionEvent e) {

            }
        };
        userConfirmationBtn.addActionListener(pass);
        userConfirmationBtn.setMnemonic(KeyEvent.VK_E);
        userConfirmationBtn.setBounds(95, 55, 90, 20);
        userConfirmationBtn.setFont(new Font("Monospaced", Font.BOLD, 11));
        userConfirmationBtn.setBackground(Color.LIGHT_GRAY);
        userConfirmationBtn.registerKeyboardAction(userConfirmationBtn.getActionForKeyStroke(
                                                   KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, false)),
                                                   KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, false),
                                                   JComponent.WHEN_IN_FOCUSED_WINDOW);
        userConfirmationBtn.registerKeyboardAction(userConfirmationBtn.getActionForKeyStroke(
                                                   KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, true)),
                                                   KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true),
                                                   JComponent.WHEN_IN_FOCUSED_WINDOW);

        // set the properties and actions of this button
        Action openSubmenu = new AbstractAction() {

            public void actionPerformed(ActionEvent e) {

                System.out.println("Submenu");
            }
        };
        submenu.addActionListener(openSubmenu);
        submenu.setMnemonic(KeyEvent.VK_S);
        submenu.setBounds(190, 55, 90, 20);
        submenu.setFont(new Font("Monospaced", Font.BOLD, 11));
        submenu.setBackground(Color.LIGHT_GRAY);
        
        passwordPanel = new JPanel() {

            @Override
            protected void paintComponent(Graphics g) {

                // Scale image to size of component
                Dimension d = getSize();

                g.drawImage(frameBackground.getImage(), 0, 0, d.width, d.height, null);

                super.paintComponent(g);
            }
        };
        passwordPanel.setOpaque(false);

        // set this panel's layout to null for absolute positioning of
        // components
        passwordPanel.setLayout(null);
        
        // add the components to this panel
        passwordPanel.add(passwordLabel);
        passwordPanel.add(passwordField);
        passwordPanel.add(userConfirmationBtn);
        passwordPanel.add(submenu);

        // add the panel to the container
        getContentPane().add(passwordPanel);
        
        setTitle(" User Confirmation");
        setIconImage(icon);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 120);
        setResizable(true);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public static void main(String[] args) {

        SwingUtilities.invokeLater(new Runnable() {
            
            public void run() {

                new PasswordField();
            }
        });
    }
} 

sir i lost the focused again, when i declared an action for the JTextField...

[Karthick Dharani Vidhya]

Hi,

First question is why do you want to add a action listener to a Text field? What is the functionality that you are trying to acheive by doing so.

One solution for your above issue will be to add a Key Listener to your password field and check if the pressed key is ENTER or not. If ENTER, then delegate the action to USERCONFIRMATIONBTN or call USERCONFIRMATIONBTN.doClick() as shown below

  passwordField.addKeyListener(new KeyAdapter(){
            public void keyPressed(KeyEvent e) {
                if(e.getKeyCode()==KeyEvent.VK_ENTER){
                    userConfirmationBtn.doClick();
                }
            }
        });  

[jhon max]

thank you sir.. I resolved it in this way

    
 Action pass = new AbstractAction() {

            public void actionPerformed(ActionEvent e) {

               
                char[] passwordChars = passwordField.getPassword();

inside of the button action I added the passwordField then retrieved its generated password,
sorry for asking too much, i didnt have any idea that i can still call a different component from another action event..