GuiBox.java

import java.awt.Color;
import java.awt.ComponentOrientation;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 *
 */
public class GuiBox extends JPanel {

    private static final int FONT_SIZE = 18;

    private GuiField[] fields;

    private ListenerFactory listenerFactory;

    private int index;

    /**
     * @param listenerFactory
     *
     */
    public GuiBox(int index, ListenerFactory listenerFactory) {
        super();
        this.listenerFactory = listenerFactory;
        fields = new GuiField[Field.POSSIBILITIES];
        this.setLayout(new GridLayout((int) Math.round(Math
                                      .sqrt(Field.POSSIBILITIES)), (int) Math.round(Math
                                              .sqrt(Field.POSSIBILITIES))));
        this.setBorder(BorderFactory.createLineBorder(Color.black));

        for (int i = 0; i < Field.POSSIBILITIES; i++) {
            fields[i] = new GuiField(index, i);
            fields[i].setText("");
            fields[i].setBorder(BorderFactory.createLineBorder(Color.gray));
            fields[i].setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
            fields[i].addMouseListener(listenerFactory
                                       .getPopupMenuListener(fields[i]));
            add(fields[i]);
            fields[i].setFont(new Font(fields[i].getFont().getName(), fields[i]
                                       .getFont().getStyle(), FONT_SIZE));
            fields[i].setPreferredSize(new Dimension(FONT_SIZE
                                       + (int) (FONT_SIZE * 0.4 * Math.ceil(Math
                                                                            .log10((Field.POSSIBILITIES)))), FONT_SIZE
                                       + (int) (FONT_SIZE * 0.4 * Math.ceil(Math
                                                                            .log10((Field.POSSIBILITIES))))));
            fields[i].addMouseListener(new MouseListener() {

                public void mouseReleased(MouseEvent arg0) {
                    // TODO Auto-generated method stub

                }

                public void mousePressed(MouseEvent arg0) {
                    // TODO Auto-generated method stub

                }

                public void mouseExited(MouseEvent arg0) {
                    // TODO Auto-generated method stub

                }

                public void mouseEntered(MouseEvent arg0) {
                    // TODO Auto-generated method stub

                }

                public void mouseClicked(MouseEvent arg0) {
                    // TODO Auto-generated method stub

                }
            });

        }

    }

    /**
     * @param element
     *            ele
     * @return jLabel
     */
    public JLabel getLabel(int element) {
        return fields[element];
    }
}