/* * WmvcApp - The main Application Class for Wmvc * Copyright (c) 2001, Bruce E. Wampler */import java.awt.*;import java.awt.event.*;import javax.swing.*;public abstract class WmvcApp{    private static WmvcApp theApp = null;       // Singleton    // Model        protected static WmvcModel theModel = null;        // GUI interface parts    private static JFrame theFrame = null;  // The topmost frame    private static JMenuBar theMenuBar = null;    private static JToolBar theToolBar = null;    private static JPanel theContentPanel = null;       public static JFrame getFrame() { return theFrame; }    public static JMenuBar getMenuBar() { return theMenuBar; }    public static JToolBar getToolBar() { return theToolBar; }    public static JPanel getContentPanel()        { return theContentPanel; }    public static WmvcModel getModel() { return theModel; }    public static void setModel(WmvcModel m) { theModel = m; }        public static WmvcApp getApp()    {        return theApp;    }        // Only one constructor. Could have alternates:    //        public WmvcApp()    //        public WmvcApp(String aName)    public WmvcApp(String aName, boolean cMenu, boolean cTool)    {        if (theApp != null)            return;        theApp = this;        initializeWmvc(aName,cMenu,cTool);    }        private void initializeWmvc(String aName, boolean cMenu,                                boolean cTool)    {        // Step 1 - set up the main JFrame        theFrame = new JFrame(aName);        // handle closing cleanly        theFrame.setDefaultCloseOperation(                                    JFrame.DO_NOTHING_ON_CLOSE);        theFrame.addWindowListener(new WindowAdapter()          {              public void windowClosing(WindowEvent e)              {                   if (theApp.appClosing())                      System.exit(0);              }           });        // Step 2 - the menu bar        if (cMenu)              // add a MenuBar?        {            theMenuBar = new JMenuBar();            theFrame.setJMenuBar(theMenuBar);        }        // Step 3 - the JPanel (may or may not have a tool bar)                theContentPanel = new JPanel();             // A JPanel        theContentPanel.setLayout(new BorderLayout());        theContentPanel.setPreferredSize(                new Dimension(400, 300));        if (cTool)              // add a Tool Bar?        {            theToolBar = new JToolBar();            theContentPanel.add(theToolBar,BorderLayout.NORTH);        }        // Note: we could add a status bar (another ToolBar) at        // the bottom by using BorderLayout.SOUTH        theFrame.setContentPane(theContentPanel);    }        public static void addMainPane(JComponent pane)    {        // This will add the "user" pane to the content pane        theContentPanel.add(pane,BorderLayout.CENTER);    }        public static void addMenu(JMenu menu)    {        if (theMenuBar == null)            return;        theMenuBar.add(menu);    }        public static void showApp()    {        theFrame.pack();        theFrame.setVisible(true);    }        public boolean appClosing()    {        return true;  // Default behavior - close automatically    }}