[Java]如何在JTabbedPane頁籤上增加關閉之按鈕

1. CustomJTabbedPaneUI之程式範例

public class CustomJTabbedPaneUI extends JTabbedPane {     String[] imgPath = null;          public CustomJTabbedPaneUI() {}          public CustomJTabbedPaneUI(String[] imgPath) {         this.imgPath = imgPath;     }          @Override      public void addTab(String title, final Component content) {         JPanel tab = new JPanel(new BorderLayout());         JLabel label = new JLabel(title);         label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 4));         JButton button = new CloseButton(imgPath);         button.setBorder(BorderFactory.createEmptyBorder());         button.addActionListener(new ActionListener() {             @Override public void actionPerformed(ActionEvent e) {                 removeTabAt(indexOfComponent(content));             }         });         tab.add(label, BorderLayout.WEST);         tab.add(button, BorderLayout.EAST);         tab.setOpaque(false);         tab.setBorder(BorderFactory.createEmptyBorder(2, 1, 1, 1));         super.addTab(title, content);         setTabComponentAt(getTabCount() - 1, tab);     } }

2. CloseButton之程式範例

// 客製 關閉頁籤 的按鈕內容 class CloseButton extends JButton implements MouseListener {     String[] imgPath = null;          public CloseButton(String[] imgPath) {         this.imgPath = imgPath;         int size = 17;         setPreferredSize(new Dimension(size, size));         setToolTipText("關閉頁籤");         setUI(new BasicButtonUI());         setContentAreaFilled(false);         setFocusable(false);         setBorder(BorderFactory.createEtchedBorder());         setBorderPainted(false);         addMouseListener(this);         setRolloverEnabled(true);     }         protected void paintComponent(Graphics g) {         super.paintComponent(g);                  // 如無圖片，則利用繪圖的方式繪製出來         Graphics2D g2 = (Graphics2D) g.create();         if(imgPath == null) {             if (getModel().isPressed()) {                 g2.translate(1, 1);             }             g2.setStroke(new BasicStroke(3));             g2.setColor(Color.BLACK);             if (getModel().isRollover()) {                 g2.setColor(Color.RED);             }             g2.drawLine(5, 5, 12, 12);             g2.drawLine(12, 6, 6, 12);             g2.dispose();         }         else {             ImageIcon img, imgEntered, imgPressed;             int size = imgPath.length;             if(size == 3) {                 img = new ImageIcon(this.getClass().getResource(imgPath[0]));                 imgEntered = new ImageIcon(this.getClass().getResource(imgPath[1]));                 imgPressed = new ImageIcon(this.getClass().getResource(imgPath[2]));             }             else if(size == 2) {                 img = new ImageIcon(this.getClass().getResource(imgPath[0]));                 imgEntered = new ImageIcon(this.getClass().getResource(imgPath[1]));                 imgPressed = imgEntered;             }             else {                 img = new ImageIcon(this.getClass().getResource(imgPath[0]));                 imgEntered = img;                 imgPressed = img;             }                          if (getModel().isRollover()) {                  g2.drawImage(imgEntered.getImage(), 1, 2, null, this);             }             else if(getModel().isPressed()) {                 g2.drawImage(imgPressed.getImage(), 1, 2, null, this);             }             else {                 g2.drawImage(img.getImage(), 1, 1, null, this);             }             g2.dispose();         }     }      @Override     public void mouseClicked(MouseEvent e) {}      @Override     public void mousePressed(MouseEvent e) {}      @Override     public void mouseReleased(MouseEvent e) {}      @Override     public void mouseEntered(MouseEvent e) {         Component component = e.getComponent();         if (component instanceof AbstractButton) {             AbstractButton button = (AbstractButton) component;             button.setBorderPainted(true);         }     }      @Override     public void mouseExited(MouseEvent e) {         Component component = e.getComponent();         if (component instanceof AbstractButton) {             AbstractButton button = (AbstractButton) component;             button.setBorderPainted(false);         }     } }

3. 主程式範例

    public void createAndShowGUI() {         // 1.設置頁籤關閉按鈕之圖片來源         //private final CustomJTabbedPaneUI tab = new CustomJTabbedPaneUI();        // 無圖片版本         String[] imgPath = {"/test2/Res/btnClose.png", "/test2/Res/btnClose_Entered.png", "/test2/Res/btnClose_Pressed.png"};       // 有圖片版本                  // 2.建立 JFrame         JFrame frame = new JFrame("如何在JTabbedPane頁籤上增加關閉之按鈕");         frame.setLayout(new BorderLayout());                  // 3.設置 Title         JLabel labTitle = new JLabel("  在JTabbedPane頁籤上增加關閉之按鈕");         labTitle.setPreferredSize(new Dimension(600, 50));         labTitle.setFont(new java.awt.Font("微軟正黑體", 1, 16));         frame.getContentPane().add(labTitle, BorderLayout.NORTH);                  // 4.設置 頁籤內容         CustomJTabbedPaneUI tabPane = new CustomJTabbedPaneUI(imgPath);         tabPane.addTab("第一個頁籤", new JLabel("第一個頁籤"));         tabPane.addTab("第二個頁籤*第二個頁籤",  new JLabel("第二個頁籤*第二個頁籤"));         tabPane.addTab("第三個頁籤/第三個頁籤/第三個頁籤",  new JScrollPane(new JTree()));         tabPane.setSelectedIndex(2);                 // 預設顯示第三個頁籤之內容         tabPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);      // 頁籤滿時，多出往前往後之按鈕，以防頁籤變成上下擠之樣貌         frame.getContentPane().add(tabPane, BorderLayout.CENTER);                  // 5.設置 增加頁籤 與 關閉全部頁籤 之 Menu         JPopupMenu popMenu = new JPopupMenu();         popMenu.add(new NewTabAction("增加頁籤", tabPane));         popMenu.addSeparator();         popMenu.add(new CloseAllAction("關閉全部頁籤", tabPane));         tabPane.setComponentPopupMenu(popMenu);                  // 6.設置 JFrame 基本設定         frame.setPreferredSize(new Dimension(600, 550));         frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);         frame.pack();         frame.setLocationRelativeTo(null);         frame.setVisible(true);     }

▲主程式之程式

    // 增加頁籤 之 Action     private int count = 4;     class NewTabAction extends AbstractAction {         CustomJTabbedPaneUI tabPane = null;                  protected NewTabAction(String label, CustomJTabbedPaneUI tabPane) {             super(label);             this.tabPane = tabPane;         }                  @Override          public void actionPerformed(ActionEvent e) {             if(tabPane != null) {                 tabPane.addTab("第" + count + "個頁籤", new JLabel("我是內容" + count));                 tabPane.setSelectedIndex(tabPane.getTabCount() - 1);                 count++;             }         }     }

▲增加頁籤之 Action

    // 關閉全部頁籤 之 Action     class CloseAllAction extends AbstractAction {         CustomJTabbedPaneUI tabPane = null;                  protected CloseAllAction(String label, CustomJTabbedPaneUI tabPane) {             super(label);             this.tabPane = tabPane;         }                  @Override          public void actionPerformed(ActionEvent e) {             if(tabPane != null) {                 tabPane.removeAll();             }         }     }

▲關閉全部頁籤之 Action

4. 執行結果

[Java]如何在JTabbedPane頁籤上增加關閉之按鈕