JTabbedPane 点 x 关闭选项卡

小咪咪 2024-04-07 14:43 78阅读 0赞

#### JTabbedPane 点 x 关闭选项卡 ####

*  1.需求描述
 *  2.代码实现
 *  3.效果演示

> 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 ##

![在这里插入图片描述][47c9fb3e997a4075b5d8947ef242a1b4.gif]

[47c9fb3e997a4075b5d8947ef242a1b4.gif]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/07/a0f15062bfca445285181d2cda64255b.gif