GridButton.java

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.event.MouseInputAdapter;

import java.awt.event.MouseEvent;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;

public class GridButton extends JButton {
    // declare instance variables
    private int row;
    private int col;
    private int value;
    private GUI gui;
    private boolean isMine;
    private boolean isFlag;
    private MineSweeper game;
    private Color baseBackground;
    private boolean isRevealed;
    private boolean isTan;
    private boolean gameOver;

    public GridButton(String text, int r, int c, MineSweeper game, GUI gui) {
        // initialize instance variables
        super(text);
        row = r;
        col = c;
        isMine = false;
        value = 0;
        isFlag = false;
        this.game = game;
        this.gui = gui;
        isRevealed = false;

        // set default font for labeled buttons
        Font largeFont = new Font("Arial", Font.BOLD, 24);
        setFont(largeFont);

        setPreferredSize(new Dimension(50, 50)); // preferred size of button

        // darkens button when hovered over
        addMouseListener(new MouseInputAdapter() {
            @Override
            public void mouseEntered(MouseEvent e) { 
                if (gameOver) return;

                if (!isRevealed) {
                setBackground(baseBackground.darker());
                }
            }

            // returns color to previous when mouse stops hovering
            @Override
            public void mouseExited(MouseEvent e) {
                if (gameOver) return;

                if (!isRevealed) {
                setBackground(baseBackground);
                }
            }

            // when a button is clicked
            @Override
            public void mouseClicked(MouseEvent e) {
                if (gameOver) return; // don't allow interaction if game is over
                
                // right click detected
                if (e.getButton() == MouseEvent.BUTTON3) {
                    if (!isFlag && !isTan) {
                        gui.flag(row, col);
                    }
                    else {
                        gui.removeFlag(row, col);
                    }
                }

                // left click detected
                else if (e.getButton() == MouseEvent.BUTTON1) {
                    gui.handleClick(GridButton.this);
                }
            }
        });
    }

    // place a flag on the cell
    public void flag() {
        ImageIcon baseIcon = new ImageIcon("images/red_flag.png");
        java.awt.Image icon = baseIcon.getImage().getScaledInstance(30, 30, 
            java.awt.Image.SCALE_SMOOTH);
        ImageIcon newIcon = new ImageIcon(icon);
        setIcon(newIcon);
        isFlag = true;
        
        // check if flag placed correctly
        if (game.isMine(row, col)) {
            gui.addCorrectFlag();
        }
        else {
            gui.subtractCorrectFlag();
        }
    }

    // remove flag from cell
    public void removeFlag() {
        setIcon(null);
        isFlag = false;
    }

    // set cell to a mine
    public void setMine() {
        isMine = true;
    }
    
    // return row
    public int getRow() {
        return row;
    }

    // return column
    public int getCol() {
        return col;
    }

    // return whether cell is a mine
    public boolean isMine() {
        return isMine;
    }

    // set value of cell
    public void setValue(int val) {
        value = val;
    }

    // return value of cell
    public int getValue() {
        return value;
    }

    // return whether cell is flagged
    public boolean isFlag() {
        return isFlag;
    }

    // change color of cell
    public void setBaseBackground(Color col) {
        baseBackground = col;
    }

    // turn the cell tan through color values from gui
    public void reveal() {
        isRevealed = true;
        setBackground(gui.getTan(row, col));
        setBaseBackground(gui.getTan(row, col));
    }

    // tan the cell and remove flag
    public void tan() {
        isTan = true;
        removeFlag();
    }

    // reveal red mine on cell
    public void revealMine() {
        Color red = new Color(217, 33, 33);
        setBackground(red);
        setBaseBackground(red);
    }

    // set the game as over on button to prevent interaction
    public void endGame() {
        gameOver = true;
    }

}