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POChange cards with a JButton from another class
 

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  1. POChange cards with a JButton from another class
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    <p>I'm getting there step by step but have come across <strong>yet another hurdle</strong>.</p> <p>The title is pretty self-explanatory, what I'm wondering is how would I be able to use the JButton "logout" with ActionListener to be able to swap the card in my main LoginScreen.class?</p> <p>I've had a few whacks but to no avail. Also any tips on improving my coding and format are welcome. Thanks in advance.</p> <p>Here's my code:</p> <p>LoginScreen.class</p> <pre><code> /*Login Screen class for allowing multiple levels of access and security*/ //Imports library files import javax.swing.*; import java.awt.event.*; import java.awt.*; import java.io.*; import java.util.*; //Creates a LoginScreen class that extends the JFrame library class class LoginScreen extends JFrame { //Creates a swing components and CardLayout for organising JPanels JPanel cardScreen; JPanel screen = new JPanel(); Image ProgramIcon = Toolkit.getDefaultToolkit().getImage("imageIco.png"); ImageIcon logo = new ImageIcon ("Logo.png"); JLabel icon = new JLabel(logo); JLabel username = new JLabel("Username"); JLabel password = new JLabel("Password"); JTextField user = new JTextField(18); JPasswordField pass = new JPasswordField(18); JButton login = new JButton("Login"); JLabel errorInfo = new JLabel(""); int WIDTH = 800; int HEIGHT = 500; int currentPanel = 1; public static void main(String[] args){ //Sets the GUI (Look and Feel) to the NimROD theme try {UIManager.setLookAndFeel("com.nilo.plaf.nimrod.NimRODLookAndFeel");} catch (UnsupportedLookAndFeelException e){ JOptionPane.showMessageDialog(null, "GUI Load Error: Unsupported");} catch (ClassNotFoundException e) { JOptionPane.showMessageDialog(null, "GUI Load Error: NimROD Missing");} catch (InstantiationException e) { JOptionPane.showMessageDialog(null, "GUI Load Error: Instantiation Missing");} catch (IllegalAccessException e) { JOptionPane.showMessageDialog(null, "GUI Load Error: Illegal Access"); } //Creates a new LoginScreen via the LoginScreen method LoginScreen LS = new LoginScreen(); } public LoginScreen(){ //Adds the JPanel to the JFrame and set the JFrame's properties //Sets the main JPanel to CardLayout platform and adds other JPanels it final CardLayout cardL = new CardLayout(); cardScreen = new JPanel(); cardScreen.setLayout(cardL); cardScreen.add(screen, "1");; BaseScreen base = new BaseScreen(); cardScreen.add(base, "2"); this.setIconImage(ProgramIcon); this.setTitle("Login"); this.setSize(WIDTH,HEIGHT); this.setResizable(false); this.add(cardScreen); this.setDefaultCloseOperation(EXIT_ON_CLOSE); //Place the components on the JPanel and set their absolute posistions screen.setLayout(null); screen.add(username); screen.add(password); screen.add(user); screen.add(pass); screen.add(login); screen.add(icon); Dimension iconSize = icon.getPreferredSize(); Dimension usernameSize = username.getPreferredSize(); Dimension passwordSize = password.getPreferredSize(); Dimension loginSize = login.getPreferredSize(); Dimension userSize = user.getPreferredSize(); Dimension passSize = pass.getPreferredSize(); username.setBounds(252,170,usernameSize.width,usernameSize.height); password.setBounds(495,170,passwordSize.width,passwordSize.height); user.setBounds(180,200,userSize.width,userSize.height); pass.setBounds(420,200,passSize.width,passSize.height); login.setBounds(375,250,loginSize.width,loginSize.height); icon.setBounds(250,50,iconSize.width,iconSize.height); this.setVisible(true); login.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { //Checks if both the user and pass text fields are empty if((user.getText().equals("")) &amp;&amp; (pass.getText().equals(""))){ //Displays an error in the form of a label and adds it to the JPanel errorInfo.setText("Please enter username and password"); screen.add(errorInfo); errorInfo.setForeground(Color.RED); Dimension errorInfoSize = errorInfo.getPreferredSize(); errorInfo.setBounds(300,300,errorInfoSize.width,errorInfoSize.height); } if((user.getText().equals("admin"))&amp;&amp;(pass.getText().equals("password"))){ cardL.show(cardScreen,"2"); } } }); } } </code></pre> <p>BaseScreen.class</p> <pre><code>//Basescreen class import javax.swing.*; import java.awt.event.*; import java.awt.*; class BaseScreen extends JPanel{ JPanel screen = this; JButton logout = new JButton("Logout"); ImageIcon title = new ImageIcon("title.png"); JLabel header = new JLabel(title); public BaseScreen(){ screen.setLayout(null); screen.add(logout); screen.add(header); Dimension headerSize = header.getPreferredSize(); Dimension logoutSize = logout.getPreferredSize(); logout.setBounds(720,440,logoutSize.width,logoutSize.height); header.setBounds(0,0,headerSize.width,headerSize.height); screen.setVisible(true); } } </code></pre> <p>If your'e wondering why I've gone through all the effort to separate out the JPanel into another class, this is because I want to use my BaseScreen class to be inherited by many other JPanel classes and add each one as a card so being able to use a JButton in one of the classes is vital for the structure of the program to work. Hopefully I haven't gone about this the complete wrong way and won't need an etire rewrite of the program.</p> <p><strong>-Zalx</strong></p>
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    1. COYou may want to take a look at this [change card layout panel from another panel](http://stackoverflow.com/questions/6175899/how-to-change-card-layout-panels-from-another-panel). Basically it consists of making your card layout static so you can access and change that static card layout after making a temporary new "Screen" object inside the actionlistener for the button.
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      1. USChad Campbell
    2. COHopefully this [answer](http://stackoverflow.com/a/13378672/1057230) of mine will help you in this direction :-)
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    3. COThankyou very much, all is working now, you're helps worked a dream!
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