JTabbedPane 点 x 关闭选项卡

系统：Win10
JDK：1.8.0_333
IDEA：2020.3.4

1.需求描述

在写一个 Swing 项目的时候，写到 JTabbedPane 时，需要实现点击 TabComponent 的 x 关闭当前选项卡的功能，就像浏览器的标签页的 x 一样，点击就关闭的功能

2.代码实现

public class JTabbedPaneClose {
    public static int sequence = 1; // 序号

    public static void main(String[] args) {
        try {
            // 设置 JTabbedPane 的 tab 标签的内衬
            UIManager.put("TabbedPane.tabInsets"
                    , new javax.swing.plaf.InsetsUIResource(3, 4, 2, 0));
        } catch (Exception e) {
            e.printStackTrace();
        }

        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.addTab(" 对象 ", new JPanel());
        tabbedPane.addTab(" + ", new JPanel());
        String filename = JTabbedPaneClose.class.getResource("/").getPath() + "images/close.png";
        ImageIcon icon = new ImageIcon(filename);
        icon.setImage(icon.getImage().getScaledInstance(20, 20, Image.SCALE_DEFAULT));
        // 添加监听
        tabbedPane.getModel().addChangeListener(new ChangeListener() {
            private boolean ignore = false; // 防止切换新选项卡引起的死循环

            @Override
            public void stateChanged(ChangeEvent e) {
                if (!ignore) {
                    ignore = true;
                    try {
                        int selected = tabbedPane.getSelectedIndex();
                        String title = tabbedPane.getTitleAt(selected);
                        if (" + ".equals(title)) {
                            JPanel panel = new JPanel();
                            String newTitle = "选项卡@" + sequence + "  ";
                            sequence++;
                            int index = tabbedPane.getTabCount() - 1;
                            tabbedPane.insertTab(newTitle, null, panel, null, index);
                            // 设置选项卡的标题组件
                            JPanel tabComponent = new JPanel();
                            tabComponent.setOpaque(false);
                            tabComponent.setLayout(new BorderLayout());
                            JLabel titleLabel = new JLabel(newTitle);
                            tabComponent.add(titleLabel, BorderLayout.WEST);
                            JLabel iconLabel = new JLabel();
                            iconLabel.setIcon(icon);
                            tabComponent.add(iconLabel, BorderLayout.EAST);
                            tabbedPane.setTabComponentAt(index, tabComponent);
                            // 删除图片添加鼠标监听操作
                            iconLabel.addMouseListener(new MouseAdapter() {
                                @Override
                                public void mousePressed(MouseEvent e) {
                                    if (e.getModifiers() == MouseEvent.BUTTON1_MASK) {
                                        JLabel source = (JLabel) e.getSource();
                                        Component parent = source.getParent();
                                        int index = tabbedPane.indexOfTabComponent(parent);
                                        tabbedPane.removeTabAt(index);
                                        if (index == tabbedPane.getSelectedIndex() && index == tabbedPane.getTabCount() - 1)
                                            tabbedPane.setSelectedIndex(index - 1);
                                    }
                                }
                            });

                            tabbedPane.setSelectedComponent(panel);
                        }
                    } finally {
                        ignore = false;
                    }
                }
            }
        });

        JFrame frame = new JFrame();
        frame.setTitle("点击x关闭选项卡");
        frame.setSize(600, 480); // 设置大小
        frame.add(tabbedPane); // 添加组件
        frame.setLocationRelativeTo(null); // 居中
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设置关闭默认操作
        frame.setVisible(true); // 设置可见
    }
}

3.效果演示