在嵌套面板中移动标签

Question

我制作了两个网格并使用嵌套面板将它们添加到 window。唯一的问题是我无法移动中心的网格，也无法在各自的网格下获取标签。尝试使用 setBounds 但这不起作用。有什么建议吗？我添加了当前状态的图像。我想分别在第一格和第二格下显示玩家和对手标签。

public static void main(String[] args) {
    window = new JFrame();
    window.setTitle("Battleship.exe");
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setPreferredSize(new Dimension(800, 800));
    
    P1_container = new JPanel(new GridLayout(10,10));
    P1_container.setPreferredSize(new Dimension(400, 400));
    P1_container.setBorder(BorderFactory.createLineBorder(Color.black, 5));
    
    compContainer = new JPanel(new GridLayout(10,10));
    compContainer.setPreferredSize(new Dimension(400, 400));
    compContainer.setBorder(BorderFactory.createLineBorder(Color.black, 5));
    
    grid = new JPanel[10][10];
    for (int i =0; i< 10; i++) {
        for (int j =0; j< 10; j++) {
            grid[i][j] = new JPanel();
            grid[i][j].setBackground(Color.white);
            grid[i][j].setBorder(BorderFactory.createLineBorder(Color.blue, 2));
            grid[i][j].setPreferredSize(new Dimension(35,35));
            P1_container.add(grid[i][j]);
        }
    }
    
    enemyGrid = new JPanel[10][10];
    for (int i =0; i< 10; i++) {
        for (int j =0; j< 10; j++) {
            enemyGrid[i][j] = new JPanel();
            enemyGrid[i][j].setBackground(Color.lightGray);
            enemyGrid[i][j].setBorder(BorderFactory.createLineBorder(Color.red, 2));
            enemyGrid[i][j].setPreferredSize(new Dimension(35, 35));
            compContainer.add(enemyGrid[i][j]);
        }
    }
    
    GridLayout layout = new GridLayout(1, 2);
    layout.setHgap(150);
    mainPanel = new JPanel(layout); 
    
    mainPanel.add(P1_container);
    mainPanel.add(compContainer);
    
    player = new JLabel("PLAYER");
    player.setBounds(100, 410, 5, 5);
    
    opponent = new JLabel("OPPONENT");
    opponent.setBounds(100, 410, 5, 5);
    
    panel = new JPanel();
    panel.setPreferredSize(new Dimension(100, 100));
    panel.add(mainPanel, BorderLayout.CENTER);
    panel.add(player, BorderLayout.WEST);
    panel.add(opponent, BorderLayout.WEST);
    
    window.add(panel, BorderLayout.CENTER);
    window.pack();
    window.setVisible(true);
}

Answer 1

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您仍在调用 setPreferredSize，您应该覆盖 getPreferredSize，并且仅在必要时覆盖。如果您的网格 JPanel 的大小是通过 getPreferredSize 调整的，则无需在它们各自的容器或 JFrame 上调用 setPreferredSize，而且您仍然没有在EDT.

正如其他人提到的，您不能在使用 LayoutManager 时使用 setBounds。要实现你想要的，你需要嵌套布局，正如你之前被告知的那样。

所以您可能想创建两个带有 BorderLayout 的 JPanel。这两个新容器将分别容纳每个网格及其标签：

JPanel p1Container = new JPanel(new BorderLayout());
p1Container.add(P1_container, BorderLayout.CENTER);
p1Container.add(player, BorderLayout.SOUTH);

JPanel opponentContainer = new JPanel(new BorderLayout());
opponentContainer.add(compContainer, BorderLayout.CENTER);
opponentContainer.add(opponent, BorderLayout.SOUTH);

...

panel.add(p1Container);
panel.add(opponentContainer);

下面的代码也没有意义：

panel = new JPanel();
panel.setPreferredSize(new Dimension(100, 100));
panel.add(mainPanel, BorderLayout.CENTER);
panel.add(player, BorderLayout.WEST);
panel.add(opponent, BorderLayout.WEST);

默认情况下，JPanel 使用 FlowLayout，因此 BorderLayout.XXX 在这里没有任何意义。再次花时间阅读 A Visual Guide to Layout Managers 但我展示的代码通过不将任何额外参数传递给 add()

来更正此问题

在嵌套面板中移动标签

Moving labels in nested panels

java

swing

jpanel

jlabel

setbounds