如何在 Swing 中堆叠标签？

Question

我正在编写我的第一个 Swing 应用程序，但在代码中堆叠标签时遇到了一些问题。

我现在有以下

我希望 "Enter the name of the repo and the name of the" 高于 "owner of that repo to search for open issues."，这样 window 就不会那么宽了。

这是我的代码：

public class MainFrame extends JFrame {

    private Boolean submitted = false;

    public MainFrame(String title) {
        super(title);


        // Set layout manager
        setLayout(new BorderLayout());

        // Create components
        JPanel panOuter = new JPanel(new BorderLayout());
        JPanel panLeft = new JPanel(new BorderLayout());

        panLeft.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        JPanel panRight = new JPanel(new BorderLayout());
        panRight.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        JPanel panBottom = new JPanel();
        panBottom.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        JPanel panTop = new JPanel();
        panTop.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        JPanel panTopTop = new JPanel();
        panTopTop.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        JPanel panTopBottom = new JPanel();
        panTopBottom.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

        // Add components to content panel
        panOuter.add(panLeft, BorderLayout.WEST);
        panOuter.add(panRight, BorderLayout.EAST);
        panOuter.add(panBottom, BorderLayout.SOUTH);
        panOuter.add(panTop, BorderLayout.NORTH);


        JLabel lblTop1 = new JLabel("Enter the name of the repo and the name of the\n", JLabel.CENTER);
        JLabel lblTop2 = new JLabel("owner of that repo to search for open issues.\n", JLabel.CENTER);
        JLabel lblLeft = new JLabel("Repo", JLabel.CENTER);
        JLabel lblRight = new JLabel("Owner", JLabel.CENTER);

        JTextField txtLeft = new JTextField("Hello", 10);
        JTextField txtRight = new JTextField("World", 10);

        JButton btnBottom = new JButton("Submit!");

        panLeft.add(lblLeft, BorderLayout.NORTH);
        panLeft.add(txtLeft, BorderLayout.CENTER);

        panRight.add(lblRight, BorderLayout.NORTH);
        panRight.add(txtRight, BorderLayout.CENTER);

        panBottom.add(btnBottom);
        panTopTop.add(lblTop1);
        panTopBottom.add(lblTop2);
        panTop.add(panTopTop, BorderLayout.NORTH);
        panTop.add(panTopBottom, BorderLayout.SOUTH);

        this.setContentPane(panOuter);
        this.pack();

        btnBottom.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                if(!submitted)
                    btnBottom.setText(txtLeft.getText());
                else 
                    btnBottom.setText(txtRight.getText());
                submitted = !submitted;
            }

        });
    }

}

我尝试制作一个包含 NORTH 和 SOUTH 标签组件的面板，但没有成功。

有人有什么建议吗？

谢谢，埃里普

Answer 1

您可以尝试使用 GridBagLayout...

JPanel panTop = new JPanel(new GridBagLayout());
panTop.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
//JPanel panTopTop = new JPanel();
//panTopTop.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
//JPanel panTopBottom = new JPanel();
//panTopBottom.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

//...

//panTopTop.add(lblTop1);
//panTopBottom.add(lblTop2);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
panTop.add(lblTop1, gbc);
panTop.add(lblTop2, gbc);
//panTop.add(panTopBottom, BorderLayout.SOUTH);

有关详细信息，请参阅 How to Use GridBagLayout

现在，您可以偷偷摸摸地使用 JTextArea...

JTextArea ta = new JTextArea(1, 20);
ta.setText("Enter the name of the repo and the name of the owner of that repo to search for open issues.");
ta.setWrapStyleWord(true);
ta.setLineWrap(true);
ta.setBorder(null);
ta.setFont(UIManager.getFont("Label.font"));
ta.setOpaque(false);
ta.setFocusable(false);
ta.setEditable(false);

//JLabel lblTop1 = new JLabel("<html>Enter the name of the repo and the name of the owner of that repo to search for open issues", JLabel.CENTER);
//JLabel lblTop2 = new JLabel("owner of that repo to search for open issues.\n", JLabel.CENTER);
//...
//panTopTop.add(lblTop1);
//panTopBottom.add(lblTop2);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
panTop.add(ta, gbc);

或者甚至只是使用 Swing 的 HTML 支持...

JLabel lblTop1 = new JLabel("<html><p align='center'>Enter the name of the repo and the name of the owner of that repo to search for open issues</p>", JLabel.CENTER);
panOuter.add(lblTop1, BorderLayout.NORTH);

如何在 Swing 中堆叠标签？

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java

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jpanel

layout-manager