SudokuBoard_I

package csc143.sudoku;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

/**
 * @author Vita Wiebe
 * @version PAx: Sudoku Serialization and Make-Up
 * A class to make create the SudokuBoard's visual functionality.
 */
public class SudokuBoard extends JPanel
   implements SelectedCell {

    // Our class fields.

    private int rows;
    private int columns;

    // The building blocks of our Regions, Cells
    private Cell cell;
    // "chosenOne" is the currently selected cell.
    private Cell chosenOne;

    // Create a 2D array to store references to each cell
    // (our coordinate system).
    private Cell[][] cellCoordinates;

    // These are associated with methods of SelectedCell interface
    int selectedRow;
    int selectedColumn;

    // "Size" is how many Cells are in a Region
    // and how many Regions on the board.
    private int size;

    // Kept package private so can be accessed by both Region and SudokuBoard.
    SudokuStub b;

    // The building blocks of our board.
    Region region;

    /** Our class constructor.
     * @param SudokuBase b.
     *
     */
    public SudokuBoard(SudokuBase b) {

        // Gets the number of rows and columns from the SudokuBase/Stub
        // object b passed to our constructor.
        rows = b.getRows();
        columns = b.getColumns();
        size = b.getSize();

        // Instantiate b, our SudokuStub/Base/Core object, SudokuBoard's sole
        // parameter and underlying element.
        this.b = new SudokuStub(rows, columns);

        // Determine the layout scheme of the overall board structure.
        setLayout(new GridLayout(rows, columns, 2, 2));

        // Instantiate our coordinate system.
        cellCoordinates = new Cell[rows*rows][columns*columns];

        // Iterate thru loops and populate our SudokuBoard with Regions
        // from the Region helper class.
        for (int row = 0; row < rows; row++) {

            for (int col = 0; col < columns; col++) {

               // Make new region with Region class and add to board.
               region = new Region(this.b);

               // This determines whether region gets shading or not.
               // I wrote it in if/else if form rather than using || so that
               // my program could employ short-circuit evaluation and, in doing so,
               // conserve computer resources.
               if ((row % 2 == 0) && (col % 2 == 0)) {
                  region.setBackground(Color.WHITE);
               } else if ((row % 2 == 1) && (col % 2 == 1)) {
                  region.setBackground(Color.WHITE);
               } else {
                  region.setBackground(new Color(220, 220, 220));
               }
               // Put the Region on the Board.
               add(region);

               // Temp variable for each cell.  Makes code neater.
               Cell ourCell;
               // Add Cells to Region.
               for (int cellRow = 0; cellRow < (rows); cellRow++) {

                  for (int cellCol = 0; cellCol < (columns); cellCol++) {
                      // y is global row coordinate
                      int y = row * rows + cellRow;
                      // x is global column coordinate
                      int x = col * columns + cellCol;

                      ourCell = createCell(y, x);
                      region.add(ourCell);
                      // Store a reference to each cell in our coordinates array.
                      cellCoordinates[y][x] = ourCell;
                  }
              }
           }
        }
    }

        /**
         * A cell "factory" method.
         * Instantiates a Cell and adds functionality to it.
         * @param int row, the row it is associated with on the board.
         * @param int col, the column it is associated with on the board.
         */
        private Cell createCell(int row, int col) {

            Cell cell = new Cell(row, col);
            cell.addMouseListener(new MouseAdapter()
            {
               @Override
               public void mouseClicked(MouseEvent click) {
                  if(cell.isSelected()) {
                     cell.deSelect();
                     chosenOne = null;
                  } else {
                       cell.select();
                       if(chosenOne != null) {
                          chosenOne.deSelect();
                       }
                       setSelected(row, col);
                       chosenOne = cell;
                       //print method to test these SelectedCell methods.
                       System.out.println(getSelectedRow()+ ", " + getSelectedColumn());
                  }
                  repaint();
               }
               @Override
               public void mouseEntered(MouseEvent entered) {
                  cell.setHoveredOver();
                  repaint();
               }
               @Override
               public void mouseExited(MouseEvent exited) {
                  cell.notHoveredOver();
                  repaint();
               }
            });
            return cell;
          }

    /*
     *@param None
     *@return b
     */
    SudokuBase getBase() {
        return b;
    }

   /**
    * Set the selected cell to the given row and column.
    * @param row The indicated row
    * @param col The indicated column
    * @throws IllegalArgumentException
    */
   public void setSelected(int row, int col) {
      if ((row < 0) || (col < 0)) {
          throw new IllegalArgumentException("Values must be greater than "
           + "or equal to 0.");
      } else {
          selectedRow = row;
          selectedColumn = col;
          chosenOne = this.cellCoordinates[row][col];
      }
   }

   /**
    * Retrive the row of the currently selected cell.
    * @return int selectedRow, the row in which the selected cell is located.
    */
   public int getSelectedRow() {
       return this.selectedRow;
   }

   /**
    * Retrive the column of the currently selected cell.
    * @return int selectedColumn in which the selected cell is located.
    */
   public int getSelectedColumn(){
       return this.selectedColumn;
   }
}