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POAccessing JFrame created in main from actionlistener
 

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  1. POAccessing JFrame created in main from actionlistener
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    <p>I've created a frame (mainframe) for my program in the main class which I want to add and remove panels from in order switch between different screens of my program. The first screen of my program is the login panel which has a start button. When I press the start button I want to switch to the menu frame. </p> <p>The removeAll method seems to work fine since the login panel disappears, but nothing appears in its place when I use the add, validate and repaint methods. I have tried to refer explicitly to the mainframe in the actionlistener (i.e. mainframe.add(menu)) but it does not recognise the object. </p> <p>Thanks in advance! </p> <pre><code>public class Main { public static JFrame mainframe = new JFrame(); public static void main(String[] args) { // Create mainframe to add and remove panels from LoginPanel lp = new LoginPanel(); System.out.println("mainframe created!"); // Set size of mainframe mainframe.setBounds(0, 0, 500, 500); mainframe.add(lp); // Get the size of the screen Dimension dim = Toolkit.getDefaultToolkit().getScreenSize(); // Determine the new location of the mainframe int w = mainframe.getSize().width; int h = mainframe.getSize().height; int x = (dim.width-w)/2; int y = (dim.height-h)/2; // Move the mainframe mainframe.setLocation(x, y); mainframe.setVisible(true); } } </code></pre> <p>This is my login panel class:</p> <pre><code>public class LoginPanel extends JPanel { private JTextField usernameField; private JPasswordField passwordField; private final Action action = new SwingAction(); /** * Create the panel. */ public LoginPanel() { JButton btnLogin = new JButton("Login"); btnLogin.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String username = usernameField.getText(); String password = new String (passwordField.getPassword()); Login login = new Login(); boolean Correct = login.isCorrect(username, password); **if (Correct == true){ removeAll(); Menu menu = new Menu(); add(menu); validate(); repaint(); setBounds(0, 0, 500, 500); System.out.println("Attempted to start menu!"); }** } }); btnLogin.setAction(action); btnLogin.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent arg0) { }}); } </code></pre>
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    1. USuser1058210
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    1. COcan you please your code in the http://sscce.org/ form
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      1. USmKorbel
    2. COMy random guess if that you are adding to a nested panel that you've removed. That or some other mistake with which panel you are adding to.
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      1. POAccessing JFrame created in main from actionlistener
      1. USTom Hawtin - tackline
    3. COOn quite a basic level, I am wondering why a JFrame made public static in my main class cannot be resolved in another class :S - any ideas? @mKorbel
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      1. USuser1058210
 

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