package JEmail.util;
 
import java.util.*;
import java.awt.*;
import javax.swing.*;
 
public class FrameResizeHandler extends Thread
{
    //consists of 2 JSplitPanes (one nested)
    private static ContentViewer cv;
    //components to resize
    private static ArrayList<JComponent> components;
    // JFrame to resize to
    private static JFrame watching; 
 
    private static int width;  // JFrame width to check against
    private static int height; // JFrame height to check against
 
    /**
     * I used an ArrayList and JComponents because I want to 
     * get it so that it can deal with multiple resizings at once
     */
    public FrameResizeHandler(JFrame jf, JComponent jc){
        watching = jf;
        components = new ArrayList<JComponent>();
        components.add(jc);
        width = watching.getWidth();
        height = watching.getHeight();
    }
 
    public void run(){
        while(true){
            if(width!=watching.getWidth() || height!=watching.getHeight()){
                if(components.get(0) instanceof ContentViewer){
			  // I know what the first element is so that's why it looks like this
                    cv = (ContentViewer)components.get(0); 
                    // adjust the JComponents' size
                    cv.setNewSize(watching.getWidth()-watching.getInsets().left-watching.getInsets().right, 
                                  watching.getHeight()-watching.getInsets().top-watching.getInsets().bottom-57);
                }
                width = watching.getWidth();  // re-adjust the dimensions to check against
                height = watching.getHeight();
            }
        }
    }
}

package JEmail.util;
 
import java.awt.*;
import javax.swing.*;
 
public class ContentViewer extends JPanel
{
    public ContentViewer(){
        createAndShowGUI();
    }
 
    public void createAndShowGUI(){
 
        WindowComponents.vertSplitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
        WindowComponents.horiSplitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
        WindowComponents.files = new JTree();
        WindowComponents.tabs = new JTabbedPane();
        WindowComponents.display = new JPanel();
        WindowComponents.tabs.add(new InboxTab(), "Inbox");
        WindowComponents.tabs.add(new ContactsTab(), "Contacts");
        WindowComponents.tabs.add(new NotesTab(), "Notes");
 
        WindowComponents.vertSplitPane.setTopComponent(WindowComponents.tabs);
        WindowComponents.vertSplitPane.setBottomComponent(WindowComponents.display);
        WindowComponents.vertSplitPane.setDividerLocation(.5);
        WindowComponents.horiSplitPane.setLeftComponent(WindowComponents.files);
        WindowComponents.horiSplitPane.setRightComponent(WindowComponents.vertSplitPane);
 
        this.add(WindowComponents.horiSplitPane);
 
    }
}

package JEmail;
import JEmail.util.*;
import javax.swing.*;
import java.awt.*;
/**
 * Write a description of class JMail_Runner here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class JMail_Runner{
 
    private static final int PWIDTH = 600;
    private static final int PHEIGHT = 500;
 
    JFrame jMailWindow;
    JEmailMenuBar menuBar;
    ContentViewer content;
    FrameResizeHandler frh;
 
    Insets windowInsets;
 
    public JMail_Runner(){
        createAndShowGUI();
    }
 
    public void createAndShowGUI(){
        try{ // Set the L&F to match the System - will have option to change later.
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        }catch(Exception e){
            e.printStackTrace();
        }
 
        jMailWindow = new JFrame("JEmail");
        jMailWindow.setPreferredSize(new Dimension(PWIDTH, PHEIGHT));
        jMailWindow.setLocation(150,100);
        jMailWindow.setSize(PWIDTH, PHEIGHT);
 
        Container pane = jMailWindow.getContentPane();
        pane.setLayout(new BorderLayout());
 
        menuBar = new JEmailMenuBar();
        content = new ContentViewer();
 
        // The MenuBar stretches fine... just not the content object
        pane.add(menuBar, BorderLayout.NORTH);
        pane.validate();
        pane.add(content, BorderLayout.CENTER);
        pane.validate();
 
        jMailWindow.setVisible(true);
    }
 
    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new JMail_Runner();
            }
        });
    }
}