如何使用MouseListener查找网格中的特定单元格 [英] How to use MouseListener to find a specific cell in a grid

问题描述

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。
Grid看起来很喜欢这个：

I'm trying to create a Java game with a 10 x 10 grid made up of cells. The Grid looks liks this:

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：

The Cell class looks like this:

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。

My issue is that I am now trying to implement the MouseListeners in the Grid class. What I have realised is that whilst I can return the X and Y coordinates of the Grid, I can't seem to manipulate the cells themselves. I am assuming this is because when I created them in Grid, I am creating 100 random Cells with no identifiers and so I have no way to directly access them.

有人能就此提出建议吗？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，错过了一种明显的访问方式吗？
谢谢

Could anybody give me advice on this? Do I need to overhaul my code and the way I am creating the cells? Am I being terribly stupid and missing an obvious way of accessing them? Thanks

推荐答案

您可以使用适配器模式，如下所示。这样，您可以单独将侦听器添加到每个网格单元，但仍然可以处理来自 Grid 的事件。

You could use an adapter pattern, as shown below. That way, you can add the listener to each grid cell individually, but still handle the events from Grid.

请注意 Grid 不再实现 MouseListener ，现在由单元格处理。

Note that Grid no longer implements MouseListener, this is handled by the cells now.

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);
    }
}

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