如何使用MouseListener查找网格中的特定单元格

Question

我正在尝试创建一个由单元格组成的10 x 10网格的Java游戏.网格看起来像这样:

public class Grid extends JPanel implements MouseListener {
    public static final int GRID_SIZE = 10;

    public Grid() {
        setPreferredSize(new Dimension(300, 300));
        setLayout(new GridLayout(GRID_SIZE, GRID_SIZE));

        for (int x = 0; x < GRID_SIZE; x++)
            for (int y = 0; y < GRID_SIZE; y++)
                add(new Cell(x, y));
        addMouseListener(this);
    }

// All Mouse Listener methods are in here.

Cell类看起来像这样:

public class Cell extends JPanel {

    public static final int CELL_SIZE = 1;
    private int xPos;
    private int yPos;

    public Cell (int x, int y) {
        xPos = x;
        yPos = y;
        setOpaque(true);
        setBorder(BorderFactory.createBevelBorder(CELL_SIZE));
        setBackground(new Color(105, 120, 105));
        setPreferredSize(new Dimension(CELL_SIZE, CELL_SIZE));
    }

    // Getter methods for x and y.

我的问题是我现在正在尝试在Grid类中实现MouseListeners.我已经意识到,虽然我可以返回网格的X和Y坐标,但我似乎无法操纵细胞本身.我假设这是因为当我在Grid中创建它们时,我创建了100个没有标识符的随机单元格,因此我无法直接访问它们.

有人可以给我这个建议吗？我是否需要彻底检查我的代码以及创建单元格的方式？我是非常愚蠢的,并且错过了一种明显的访问方式吗？谢谢

Answer 1

您可以使用适配器模式，如下所示。这样，您可以将侦听器单独添加到每个网格单元，但仍处理来自 的事件Grid。

请注意，Grid不再实现MouseListener，现在由单元格处理。

public class Grid extends JPanel {
    public static final int GRID_SIZE = 10;

    public Grid() {
        setPreferredSize(new Dimension(300, 300));
        setLayout(new GridLayout(GRID_SIZE, GRID_SIZE));

        for (int x = 0; x < GRID_SIZE; x++) {
            for (int y = 0; y < GRID_SIZE; y++) {
                final Cell cell = new Cell(x, y);
                add(cell);
                cell.addMouseListener(new MouseListener() {
                    public void mouseClicked(MouseEvent e) {
                        click(e, cell);
                    }
                    // other mouse listener functions
                });
            }
        }        
    }

    public void click(MouseEvent e, Cell cell) {
        // handle the event, for instance
        cell.setBackground(Color.blue);
    }

    // handlers for the other mouse events
}

子类可以将其重写为：

public class EnemyGrid extends Grid {
    public void click(MouseEvent e, Cell cell) {
        cell.setBackground(Color.red);
    }
}