java - Minesweeper Action Events

Question

Is there a way to make certain event actions specific to left and right mouse clicks?

I'm creating a minesweeper gui, so when a square is left-clicked it will be uncovered, & when it's right-clicked it will be flagged.

I wasn't sure how to syntactically check for this & couldn't find it on the tut.

Thanks for the help!

Answer 1

I decided to give it a go, to try to create a simple Mine Sweeper application, one without a timer or reset (yet), but that is functional and uses both a GUI cell class and a non-GUI model class (it can't be copied and used in for intro to Java homework).

Edit 1: now has reset capability:

MineSweeper.java: holds the main method and starts the JFrame

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

@SuppressWarnings("serial")
public class MineSweeper {
   private JPanel mainPanel = new JPanel();
   private MineCellGrid mineCellGrid;
   private JButton resetButton = new JButton("Reset");

   public MineSweeper(int rows, int cols, int mineTotal) {
      mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.PAGE_AXIS));
      mineCellGrid = new MineCellGrid(rows, cols, mineTotal);

      resetButton.setMnemonic(KeyEvent.VK_R);
      resetButton.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            mineCellGrid.reset();
         }
      });

      mainPanel.add(mineCellGrid);
      mainPanel.add(new JSeparator());
      mainPanel.add(new JPanel(){{add(resetButton);}});
   }

   private JPanel getMainPanel() {
      return mainPanel;
   }

   private static void createAndShowUI() {
      JFrame frame = new JFrame("MineSweeper");
      //frame.getContentPane().add(new MineSweeper(20, 20, 44).getMainPanel());
      frame.getContentPane().add(new MineSweeper(12, 12, 13).getMainPanel());
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      java.awt.EventQueue.invokeLater(new Runnable() {
         public void run() {
            createAndShowUI();
         }
      });
   }
}

MineCellGrid.java: the class that displays the grid of mine cells and times them all together.

import java.awt.GridLayout;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JPanel;

@SuppressWarnings("serial")
public class MineCellGrid extends JPanel {
   private MineCellGridModel model;
   private List<MineCell> mineCells = new ArrayList<MineCell>();

   public MineCellGrid(final int maxRows, final int maxCols, int mineNumber) {
      model = new MineCellGridModel(maxRows, maxCols, mineNumber);
      setLayout(new GridLayout(maxRows, maxCols));

      for (int row = 0; row < maxRows; row++) {
         for (int col = 0; col < maxCols; col++) {
            MineCell mineCell = new MineCell(row, col);
            add(mineCell);
            mineCells.add(mineCell);
            model.add(mineCell.getModel(), row, col);
         }
      }

      reset();
   }

   public void reset() {
      model.reset();
      for (MineCell mineCell : mineCells) {
         mineCell.reset();
      }
   }
}

MineCellGridModel.java: the non-GUI model for the MineCellGrid

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.JOptionPane;

public class MineCellGridModel {
   private MineCellModel[][] cellModelGrid;
   private List<Boolean> mineList = new ArrayList<Boolean>();
   private CellModelPropertyChangeListener cellModelPropChangeListener = new CellModelPropertyChangeListener();
   private int maxRows;
   private int maxCols;
   private int mineNumber;
   private int buttonsRemaining;

   public MineCellGridModel(final int maxRows, final int maxCols, int mineNumber) {
      this.maxRows = maxRows;
      this.maxCols = maxCols;
      this.mineNumber = mineNumber;
      for (int i = 0; i < maxRows * maxCols; i++) {
         mineList.add((i < mineNumber) ? true : false);
      }
      cellModelGrid = new MineCellModel[maxRows][maxCols];
      buttonsRemaining = (maxRows * maxCols) - mineNumber;
   }

   public void add(MineCellModel model, int row, int col) {
      cellModelGrid[row][col] = model;
      model.addPropertyChangeListener(cellModelPropChangeListener);
   }

   public void reset() {
      buttonsRemaining = (maxRows * maxCols) - mineNumber;

      // randomize the mine location
      Collections.shuffle(mineList);
      // reset the model grid and set mines
      for (int r = 0; r < cellModelGrid.length; r++) {
         for (int c = 0; c < cellModelGrid[r].length; c++) {
            cellModelGrid[r][c].reset();
            cellModelGrid[r][c].setMined(mineList.get(r
                     * cellModelGrid[r].length + c));
         }
      }
      // advance value property of all neighbors of a mined cell
      for (int r = 0; r < cellModelGrid.length; r++) {
         for (int c = 0; c < cellModelGrid[r].length; c++) {
            if (cellModelGrid[r][c].isMined()) {
               int rMin = Math.max(r - 1, 0);
               int cMin = Math.max(c - 1, 0);
               int rMax = Math.min(r + 1, cellModelGrid.length - 1);
               int cMax = Math.min(c + 1, cellModelGrid[r].length - 1);
               for (int row2 = rMin; row2 <= rMax; row2++) {
                  for (int col2 = cMin; col2 <= cMax; col2++) {
                     cellModelGrid[row2][col2].incrementValue();
                  }
               }
            }
         }
      }
   }

   private class CellModelPropertyChangeListener implements
            PropertyChangeListener {

      public void propertyChange(PropertyChangeEvent evt) {
         MineCellModel model = (MineCellModel) evt.getSource();
         int row = model.getRow();
         int col = model.getCol();

         if (evt.getPropertyName().equals(MineCellModel.BUTTON_PRESSED)) {
            if (cellModelGrid[row][col].isMineBlown()) {
               mineBlown();
            } else {
               buttonsRemaining--;
               if (buttonsRemaining <= 0) {
                  JOptionPane.showMessageDialog(null, "You've Won!!!", "Congratulations", JOptionPane.PLAIN_MESSAGE);
               }
               if (cellModelGrid[row][col].getValue() == 0) {
                  zeroValuePress(row, col);
               }
            }
         }
      }

      private void mineBlown() {
         for (int r = 0; r < cellModelGrid.length; r++) {
            for (int c = 0; c < cellModelGrid[r].length; c++) {
               MineCellModel model = cellModelGrid[r][c];
               if (model.isMined()) {
                  model.setMineBlown(true);
               }
            }
         }

      }

      private void zeroValuePress(int row, int col) {
         int rMin = Math.max(row - 1, 0);
         int cMin = Math.max(col - 1, 0);
         int rMax = Math.min(row + 1, cellModelGrid.length - 1);
         int cMax = Math.min(col + 1, cellModelGrid[row].length - 1);
         for (int row2 = rMin; row2 <= rMax; row2++) {
            for (int col2 = cMin; col2 <= cMax; col2++) {
               cellModelGrid[row2][col2].pressedAction();
            }
         }
      }
   }
}

MineCell.java: the class that I started on. Uses the model class as its non-GUI nucleus.

import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Insets;
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.*;

/**
 * http://stackoverflow.com/questions/7006029/minesweeper-action-events
 * 
 * @author Pete
 */
@SuppressWarnings("serial")
public class MineCell extends JPanel {
   private static final String LABEL = "label";
   private static final String BUTTON = "button";
   private static final int PS_WIDTH = 24;
   private static final int PS_HEIGHT = PS_WIDTH;
   private static final float LABEL_FONT_SIZE = (float) (24 * PS_WIDTH) / 30f;
   private static final float BUTTON_FONT_SIZE = (float) (14 * PS_WIDTH) / 30f;
   private JButton button = new JButton();
   private JLabel label = new JLabel(" ", SwingConstants.CENTER);
   private CardLayout cardLayout = new CardLayout();
   private MineCellModel model;

   public MineCell(final boolean mined, int row, int col) {
      model = new MineCellModel(mined, row, col);
      model.addPropertyChangeListener(new MyPCListener());
      label.setFont(label.getFont().deriveFont(Font.BOLD, LABEL_FONT_SIZE));
      button.setFont(button.getFont().deriveFont(Font.PLAIN, BUTTON_FONT_SIZE));
      button.setMargin(new Insets(1, 1, 1, 1));
      setLayout(cardLayout);

      add(button, BUTTON);
      add(label, LABEL);

      button.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            pressedAction();
         }
      });
      button.addMouseListener(new MouseAdapter() {
         @Override
         public void mousePressed(MouseEvent e) {
            if (e.getButton() == MouseEvent.BUTTON3) {
               model.upDateButtonFlag();
            }
         }
      });
   }

   public MineCell(int row, int col) {
      this(false, row, col);
   }

   @Override
   public Dimension getPreferredSize() {
      return new Dimension(PS_WIDTH, PS_HEIGHT);
   }

   public void pressedAction() {
      if (model.isFlagged()) {
         return;
      }
      model.pressedAction();
   }

   public void showCard(String cardConstant) {
      cardLayout.show(this, cardConstant);
   }

   // TODO: have this change the button's icon
   public void setFlag(boolean flag) {
      if (flag) {
         button.setBackground(Color.yellow);
         button.setForeground(Color.red);
         button.setText("f");
      } else {
         button.setBackground(null);
         button.setForeground(null);
         button.setText("");
      }
   }

   private void setMineBlown(boolean mineBlown) {
      if (mineBlown) {
         label.setBackground(Color.red);
         label.setOpaque(true);
         showCard(LABEL);
      } else {
         label.setBackground(null);
      }
   }

   public MineCellModel getModel() {
      return model;
   }

   public void addPropertyChangeListener(PropertyChangeListener listener) {
      model.addPropertyChangeListener(listener);
   }

   public void removePropertyChangeListener(PropertyChangeListener listener) {
      model.removePropertyChangeListener(listener);
   }

   private class MyPCListener implements PropertyChangeListener {
      public void propertyChange(PropertyChangeEvent evt) {
         String propName = evt.getPropertyName();
         if (propName.equals(MineCellModel.MINE_BLOWN)) {
            setMineBlown(true);
         } else if (propName.equals(MineCellModel.FLAG_CHANGE)) {
            setFlag(model.isFlagged());
         } else if (propName.equals(MineCellModel.BUTTON_PRESSED)) {
            if (model.isMineBlown()) {
               setMineBlown(true);
            } else {
               String labelText = (model.getValue() == 0) ? "" : String
                        .valueOf(model.getValue());
               label.setText(labelText);
            }
            showCard(LABEL);
         }
      }
   }

   public void reset() {
      setFlag(false);
      setMineBlown(false);
      showCard(BUTTON);
      label.setText("");
   }

}

MineCellModel.java: the non-GUI model for the mine cell

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.event.SwingPropertyChangeSupport;

class MineCellModel {
   public static final String FLAG_CHANGE = "Flag Change";
   public static final String BUTTON_PRESSED = "Button P