java - JPanel 可调整大小，组件位于中心

Question

下面是我正在制作的这个游戏的代码。这是一个猜数字的游戏。无论如何，我的主要问题是如何制作 gamePanel 的内容，以便当您调整屏幕大小时，组件仍然位于中心。因此，如果屏幕变得更小，那么组件会自动移动并被压扁，并且仍然显示在面板中。

我多年来一直试图解决这个问题。

public class GameScreen {    

    public static void main(String[] args) {
        final JFrame game;
        final JButton playButton, guessButton;
        final JPanel topPanel, gamePanel, rangePanel, guessPanel;
        final JTextArea gameStatus;
        final GuessingGame gameNumbers;

        game = new JFrame();
        gameNumbers = new GuessingGame();
        game.setTitle("Guessing Game");
        game.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JLabel playerLabel = new JLabel("Player: ");
        JLabel guessLabel = new JLabel("Guess: ");
        final JLabel rangeLabel = new JLabel("Range: ");

        final JTextField playerName = new JTextField("", 20);
        final JTextField guessInput = new JTextField("", 20);

        playButton = new JButton("Play");
        guessButton = new JButton("Guess");

        topPanel = new JPanel();
        gamePanel = new JPanel();
        rangePanel = new JPanel(new BorderLayout());
        guessPanel = new JPanel(new FlowLayout());
        CountDownProgressBar countDownPanel = new CountDownProgressBar();


        gameStatus = new JTextArea(10, 20);
        JScrollPane scroll = new JScrollPane(gameStatus);

        game.add(topPanel, BorderLayout.NORTH);
        game.add(scroll, BorderLayout.EAST);
        game.add(gamePanel, BorderLayout.WEST);
        game.add(countDownPanel, BorderLayout.SOUTH);

        gamePanel.add(rangePanel);
        gamePanel.add(guessPanel);

        topPanel.setBackground(Color.yellow);
        topPanel.add(playerLabel);
        topPanel.add(playerName);
        topPanel.add(playButton);

        rangePanel.add(rangeLabel);

        guessPanel.add(guessLabel);
        guessPanel.add(guessInput);
        guessPanel.add(guessButton);   

        gameStatus.setFocusable(false);
        guessButton.setEnabled(false); 
        guessInput.setEnabled(false);
        playButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if (playerName.getText().equals("")) {
                    JOptionPane.showMessageDialog(gamePanel, "Invalid Player Name");
                } else {
                    gameNumbers.play();    
                    gameStatus.append("Game Started!\n");
                    rangeLabel.setText(gameNumbers.toString());           
                    guessButton.setEnabled(true);
                    guessInput.setEnabled(true);
                    playButton.setEnabled(false);
                    playerName.setEnabled(false);
                }
            }
        });
        guessButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int playerGuess = Integer.parseInt(guessInput.getText());
                if (gameNumbers.isGuessCorrect(playerGuess)) {
                    gameStatus.append("Game Over!\n");
                    guessButton.setEnabled(false);
                    guessInput.setEnabled(false);
                    playButton.setEnabled(true);
                    playerName.setEnabled(true);
                    JOptionPane.showMessageDialog(gamePanel, "" + playerName.getText() + " wins!");
                } if (gameNumbers.isGuessAlmostCorrect(playerGuess)) {
                    gameStatus.append("very close!\n");
                    guessInput.requestFocus();
                } if (gameNumbers.isGuessLarger(playerGuess)) {
                    gameStatus.append("try something smaller...\n");
                    guessInput.requestFocus();
                } if (gameNumbers.isGuessSmaller(playerGuess)) {
                    gameStatus.append("try something larger...\n");
                    guessInput.requestFocus();
                } 
            }
        });
        game.pack();
        game.setVisible(true);
    }


}

Answer 1

还有很多缺失，但是，如果我没看错的话，请将 gamePanel 的布局管理器更改为 GridBagLayout (gamePanel = new JPanel( new GridBagLayout()))并将其添加到 game 面板的中心位置 (game.add(gamePanel, BorderLayout.CENTER))。