j按钮无法正确添加

Question

为了更好的参考，我正在做match3（糖果挤压类型）游戏。

public class BoardGraphics extends JPanel {
public static final int WIDTH = 400;
public static final int HEIGHT = 400;
private static final Color COLOR = new Color(0xFF0000); //0xF1E4CB
private final Board board;
public BoardGraphics(Board board){
    this.setBackground( COLOR );
    this.setSize(HEIGHT, WIDTH);
    this.setLayout(new GridLayout(board.getHeight(), board.getWidth(), 0, 0));
    this.board = board;
    setVisible(true);
    drawElements();
}
    private void drawElements(){
    for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 2; j++) {
            Point p = new Point(i, j);
            //Point p = new Point(1, 2);
            ImageIcon icon = null;
            try {
                BufferedImage img = null;
                img = ImageIO.read(new File(System.getProperty("user.dir") + "/assets/img/gem_" + board.getElement(p).getTileColor().toString() + ".gif"));
                icon = new ImageIcon(img);
                JButton btn = new JButton(icon);
                btn.setVisible(true);
                btn.setOpaque(false);
                btn.setContentAreaFilled(false);
                btn.setBorderPainted(false);
                btn.setSize(50, 50);
                if (i == 1) {
                    btn.setLocation(100, 100); // <- i did this for testing. with this i see 2 gems
                }
                this.add(btn);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        }
    this.revalidate();
    this.repaint();
    }
}

和这里的jFrame代码：

public class GameGraphics extends JFrame {
private final int WIDTH = 600;
private final int HEIGHT = 800;
private Game game = new Game();
public GameGraphics() {
    setTitle("SwitchElements");
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(HEIGHT, WIDTH);
    setLocationRelativeTo(null);
    setVisible(true);
    setResizable(false);
    drawBoard();
}
private void drawBoard(){
    // 0xF1E4CB
    BoardGraphics board = new BoardGraphics(game.getGameBoard());
    System.out.println((WIDTH-BoardGraphics.WIDTH)/2);
    board.setLocation( (HEIGHT-BoardGraphics.HEIGHT)/2, (WIDTH-BoardGraphics.WIDTH)/2);
    this.add( board );
    this.repaint();
}
}

问题是我什么都试过了。但是jButtons并不是按照网格来堆叠的。似乎所有这些都添加到一个位置

Answer 1

"但是jButtons并不是按照网格来堆叠的。似乎所有的按钮都添加到了一个地方"

由于您从未回答过我关于Board是什么的问题/评论，我将做一个假设。（如果我错了，请纠正我）

看看你的GridLayout建筑

new GridLayout(board.getHeight(), board.getWidth(), 0, 0)

假设Board是某种容器，让我们假设维度为300300。

对于GridLayout构造函数，您说应该有300行和300列。在两个循环中总共只有四次迭代，所以只有4个按钮。布局映射到9000个可用空间。所以，是的，你所有的按钮都将只放在网格的左上角（前四个）位置，其余8996个空格将是最大按钮大小的空格。

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要想看到按钮正确添加到网格中，可以做的是向drawElements()方法传递几个参数，以确保迭代与布局参数相同。

private void drawElements(int rows, int cols) {
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
    ....
}

然后称之为

public public BoardGraphics(Board board){
    int rows = ...
    int cols = ...
    setLayout(new GridLayout(rows, cols, 0, 0));
    drawElements(rows, cols);

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此外，您应该避免对组件使用setSize()和setLocation()。您应该使用布局管理器，并让他们为您确定的大小和位置。您可以阅读"在容器中布置零部件"以了解有关可用不同布局的更多信息。