wizard.java

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        WizardPanelDescriptor oldPanelDescriptor = wizardModel.getCurrentPanelDescriptor();
        if (oldPanelDescriptor != null)
            oldPanelDescriptor.aboutToHidePanel();
        
        wizardModel.setCurrentPanel(id);
        wizardModel.getCurrentPanelDescriptor().aboutToDisplayPanel();
        
        //  Show the panel in the dialog.
        
        cardLayout.show(cardPanel, id.toString());
        wizardModel.getCurrentPanelDescriptor().displayingPanel();        
        
        
    }
    
    /**
     * Method used to listen for property change events from the model and update the
     * dialog's graphical components as necessary.
     * @param evt PropertyChangeEvent passed from the model to signal that one of its properties has changed value.
     */    
    public void propertyChange(PropertyChangeEvent evt) {
        
        if (evt.getPropertyName().equals(WizardModel.CURRENT_PANEL_DESCRIPTOR_PROPERTY)) {
            wizardController.resetButtonsToPanelRules(); 
        } else if (evt.getPropertyName().equals(WizardModel.NEXT_FINISH_BUTTON_TEXT_PROPERTY)) {            
            nextButton.setText(evt.getNewValue().toString());
        } else if (evt.getPropertyName().equals(WizardModel.BACK_BUTTON_TEXT_PROPERTY)) {            
            backButton.setText(evt.getNewValue().toString());
        } else if (evt.getPropertyName().equals(WizardModel.CANCEL_BUTTON_TEXT_PROPERTY)) {            
            cancelButton.setText(evt.getNewValue().toString());
        } else if (evt.getPropertyName().equals(WizardModel.NEXT_FINISH_BUTTON_ENABLED_PROPERTY)) {            
            nextButton.setEnabled(((Boolean)evt.getNewValue()).booleanValue());
        } else if (evt.getPropertyName().equals(WizardModel.BACK_BUTTON_ENABLED_PROPERTY)) {            
            backButton.setEnabled(((Boolean)evt.getNewValue()).booleanValue());
        } else if (evt.getPropertyName().equals(WizardModel.CANCEL_BUTTON_ENABLED_PROPERTY)) {            
            cancelButton.setEnabled(((Boolean)evt.getNewValue()).booleanValue());
        } else if (evt.getPropertyName().equals(WizardModel.NEXT_FINISH_BUTTON_ICON_PROPERTY)) {            
            nextButton.setIcon((Icon)evt.getNewValue());
        } else if (evt.getPropertyName().equals(WizardModel.BACK_BUTTON_ICON_PROPERTY)) {            
            backButton.setIcon((Icon)evt.getNewValue());
        } else if (evt.getPropertyName().equals(WizardModel.CANCEL_BUTTON_ICON_PROPERTY)) {            
            cancelButton.setIcon((Icon)evt.getNewValue());
        }
        
    }
    
    /**
     * Retrieves the last return code set by the dialog.
     * @return An integer that identifies how the dialog was closed. See the *_RETURN_CODE
     * constants of this class for possible values.
     */    
    public int getReturnCode() {
        return returnCode;
    }
    
   /**
     * Mirrors the WizardModel method of the same name.
     * @return A boolean indicating if the button is enabled.
     */  
    public boolean getBackButtonEnabled() {
        return wizardModel.getBackButtonEnabled().booleanValue();
    }

   /**
     * Mirrors the WizardModel method of the same name.
     * @param boolean newValue The new enabled status of the button.
     */ 
    public void setBackButtonEnabled(boolean newValue) {
        wizardModel.setBackButtonEnabled(new Boolean(newValue));
    }

   /**
     * Mirrors the WizardModel method of the same name.
     * @return A boolean indicating if the button is enabled.
     */ 
    public boolean getNextFinishButtonEnabled() {
        return wizardModel.getNextFinishButtonEnabled().booleanValue();
    }

   /**
     * Mirrors the WizardModel method of the same name.
     * @param boolean newValue The new enabled status of the button.
     */ 
    public void setNextFinishButtonEnabled(boolean newValue) {
        wizardModel.setNextFinishButtonEnabled(new Boolean(newValue));
    }
 
   /**
     * Mirrors the WizardModel method of the same name.
     * @return A boolean indicating if the button is enabled.
     */ 
    public boolean getCancelButtonEnabled() {
        return wizardModel.getCancelButtonEnabled().booleanValue();
    }

    /**
     * Mirrors the WizardModel method of the same name.
     * @param boolean newValue The new enabled status of the button.
     */ 
    public void setCancelButtonEnabled(boolean newValue) {
        wizardModel.setCancelButtonEnabled(new Boolean(newValue));
    }
    
    /**
     * Closes the dialog and sets the return code to the integer parameter.
     * @param code The return code.
     */    
    void close(int code) {
        returnCode = code;
        wizardDialog.dispose();
    }
    
    /**
     * This method initializes the components for the wizard dialog: it creates a JDialog
     * as a CardLayout panel surrounded by a small amount of space on each side, as well
     * as three buttons at the bottom.
     */
    
    private void initComponents() {

        wizardModel.addPropertyChangeListener(this);       
        wizardController = new WizardController(this);       

        wizardDialog.getContentPane().setLayout(new BorderLayout());
        wizardDialog.addWindowListener(this);
                
        //  Create the outer wizard panel, which is responsible for three buttons:
        //  Next, Back, and Cancel. It is also responsible a JPanel above them that
        //  uses a CardLayout layout manager to display multiple panels in the 
        //  same spot.
        
        JPanel buttonPanel = new JPanel();
        JSeparator separator = new JSeparator();
        Box buttonBox = new Box(BoxLayout.X_AXIS);

        cardPanel = new JPanel();
        cardPanel.setBorder(new EmptyBorder(new Insets(5, 10, 5, 10)));       

        cardLayout = new CardLayout(); 
        cardPanel.setLayout(cardLayout);
        
        backButton = new JButton(new ImageIcon("com/nexes/wizard/backIcon.gif"));
        nextButton = new JButton();
        cancelButton = new JButton();
        
        backButton.setActionCommand(BACK_BUTTON_ACTION_COMMAND);
        nextButton.setActionCommand(NEXT_BUTTON_ACTION_COMMAND);
        cancelButton.setActionCommand(CANCEL_BUTTON_ACTION_COMMAND);

        backButton.addActionListener(wizardController);
        nextButton.addActionListener(wizardController);
        cancelButton.addActionListener(wizardController);
        
        //  Create the buttons with a separator above them, then place them
        //  on the east side of the panel with a small amount of space between
        //  the back and the next button, and a larger amount of space between
        //  the next button and the cancel button.
        
        buttonPanel.setLayout(new BorderLayout());
        buttonPanel.add(separator, BorderLayout.NORTH);

        buttonBox.setBorder(new EmptyBorder(new Insets(5, 10, 5, 10)));       
        buttonBox.add(backButton);
        buttonBox.add(Box.createHorizontalStrut(10));
        buttonBox.add(nextButton);
        buttonBox.add(Box.createHorizontalStrut(30));
        buttonBox.add(cancelButton);
        
        buttonPanel.add(buttonBox, java.awt.BorderLayout.EAST);
        
        wizardDialog.getContentPane().add(buttonPanel, java.awt.BorderLayout.SOUTH);
        wizardDialog.getContentPane().add(cardPanel, java.awt.BorderLayout.CENTER);

    }
    
    private static Object getImage(String name) {

        URL url = null;

        try {
            Class c = Class.forName("com.nexes.wizard.Wizard");
            url = c.getResource(name);
        } catch (ClassNotFoundException cnfe) {
            System.err.println("Unable to find Wizard class");
        }
        return url;

    }

   /**
     * If the user presses the close box on the dialog's window, treat it
     * as a cancel.
     * @param WindowEvent The event passed in from AWT.
     */ 
    
    public void windowClosing(WindowEvent e) {
        returnCode = CANCEL_RETURN_CODE;
    }
    
    
    
    static {

        try { 
            
            PropertyResourceBundle resources = (PropertyResourceBundle)
                ResourceBundle.getBundle("com.nexes.wizard.wizard");
            
            BACK_TEXT = (String)(resources.getObject("backButtonText"));
            NEXT_TEXT = (String)(resources.getObject("nextButtonText"));
            CANCEL_TEXT = (String)(resources.getObject("cancelButtonText"));
            FINISH_TEXT = (String)(resources.getObject("finishButtonText"));
            
            BACK_ICON = new ImageIcon((URL)getImage((String)(resources.getObject("backButtonIcon"))));
            NEXT_ICON = new ImageIcon((URL)getImage((String)(resources.getObject("nextButtonIcon"))));
            CANCEL_ICON = new ImageIcon((URL)getImage((String)(resources.getObject("cancelButtonIcon"))));
            FINISH_ICON = new ImageIcon((URL)getImage((String)(resources.getObject("finishButtonIcon"))));
        
        } catch (MissingResourceException mre) {
            System.out.println(mre);
            System.exit(1);
        }
    }

}