JTabbedPaneカスタムコンポーネントのレイアウト

Question

この例はUsing Swing Components; Examplesです。この例では、各タブに閉じるボタンがあるカスタムタブコンポーネントを持つJTabbedPaneを示しています。

JTabbedPaneがWRAP_TAB_LAYOUTの場合、タブタイトルと閉じるボタンはワイドタブの中央にあります。この例を変更すると、タブのタイトルはタブの中央に表示されますが、閉じるボタンは右のタブの境界の横に表示されます。ここで

は絵である：ここでは

Answer 1

• はUIManager.put("TabbedPane.tabInsets", insets)とJLayer
  • JLayer
  を使用して、タブの内側の余白に閉じるボタンをペイントを使用して一つの可能​​な実装であります
  • 私はテストしませんでしたNumbusLookAndFeel

import java.awt.*; 
import java.awt.event.*; 
import java.util.*; 
import javax.swing.*; 
import javax.swing.plaf.*; 

public class RightCloseTabButtonTest { 
    public JComponent makeUI() { 
    JTabbedPane tabs = new JTabbedPane(); 
    tabs.addTab("Tab 1", new JLabel("aaa")); 
    tabs.addTab("Tab 2", new JLabel("bbb")); 
    tabs.addTab("Tab 3", new JLabel("ccc")); 
    tabs.addTab("Tab 4", new JLabel("ddd")); 
    return new JLayer<JTabbedPane>(tabs, new CloseableTabbedPaneLayerUI()); 
    } 
    public static void main(String... args) { 
    EventQueue.invokeLater(() -> { 
     UIManager.put("TabbedPane.tabInsets", new Insets(2, 2 + 16, 2, 2 + 16)); 
     JFrame f = new JFrame(); 
     f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
     f.getContentPane().add(new RightCloseTabButtonTest().makeUI()); 
     f.setSize(300, 240); 
     f.setLocationRelativeTo(null); 
     f.setVisible(true); 
    }); 
    } 
} 

class CloseTabIcon implements Icon { 
    @Override public void paintIcon(Component c, Graphics g, int x, int y) { 
    Graphics2D g2 = (Graphics2D) g.create(); 
    g2.translate(x, y); 
    g2.setPaint(Color.BLACK); 
    if (c instanceof AbstractButton) { 
     ButtonModel m = ((AbstractButton) c).getModel(); 
     if (m.isRollover()) { 
     g2.setPaint(Color.ORANGE); 
     } 
    } 
    g2.drawLine(4, 4, 11, 11); 
    g2.drawLine(4, 5, 10, 11); 
    g2.drawLine(5, 4, 11, 10); 
    g2.drawLine(11, 4, 4, 11); 
    g2.drawLine(11, 5, 5, 11); 
    g2.drawLine(10, 4, 4, 10); 
    g2.dispose(); 
    } 
    @Override public int getIconWidth() { 
    return 16; 
    } 
    @Override public int getIconHeight() { 
    return 16; 
    } 
} 

class CloseableTabbedPaneLayerUI extends LayerUI<JTabbedPane> { 
    private final JComponent rubberStamp = new JPanel(); 
    private final Point pt = new Point(); 
    private final JButton button = new JButton(new CloseTabIcon()) { 
    @Override public void updateUI() { 
     super.updateUI(); 
     setBorder(BorderFactory.createEmptyBorder()); 
     setFocusPainted(false); 
     setBorderPainted(false); 
     setContentAreaFilled(false); 
     setRolloverEnabled(false); 
    } 
    }; 
    @Override public void paint(Graphics g, JComponent c) { 
    super.paint(g, c); 
    if (c instanceof JLayer) { 
     JLayer jlayer = (JLayer) c; 
     JTabbedPane tabPane = (JTabbedPane) jlayer.getView(); 
     Dimension d = button.getPreferredSize(); 
     for (int i = 0; i < tabPane.getTabCount(); i++) { 
     Rectangle rect = tabPane.getBoundsAt(i); 
     int x = rect.x + rect.width - d.width - 2; 
     int y = rect.y + (rect.height - d.height)/2; 
     Rectangle r = new Rectangle(x, y, d.width, d.height); 
     button.getModel().setRollover(r.contains(pt)); 
     SwingUtilities.paintComponent(g, button, rubberStamp, r); 
     } 
    } 
    } 
    @Override public void installUI(JComponent c) { 
    super.installUI(c); 
    if (c instanceof JLayer) { 
     ((JLayer) c).setLayerEventMask(
      AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK); 
    } 
    } 
    @Override public void uninstallUI(JComponent c) { 
    if (c instanceof JLayer) { 
     ((JLayer) c).setLayerEventMask(0); 
    } 
    super.uninstallUI(c); 
    } 
    @Override protected void processMouseEvent(
     MouseEvent e, JLayer<? extends JTabbedPane> l) { 
    if (e.getID() == MouseEvent.MOUSE_CLICKED) { 
     pt.setLocation(e.getPoint()); 
     JTabbedPane tabbedPane = (JTabbedPane) l.getView(); 
     int index = tabbedPane.indexAtLocation(pt.x, pt.y); 
     if (index >= 0) { 
     Rectangle rect = tabbedPane.getBoundsAt(index); 
     Dimension d = button.getPreferredSize(); 
     int x = rect.x + rect.width - d.width - 2; 
     int y = rect.y + (rect.height - d.height)/2; 
     Rectangle r = new Rectangle(x, y, d.width, d.height); 
     if (r.contains(pt)) { 
      tabbedPane.removeTabAt(index); 
     } 
     } 
    } 
    } 
    @Override protected void processMouseMotionEvent(
     MouseEvent e, JLayer<? extends JTabbedPane> l) { 
    pt.setLocation(e.getPoint()); 
    JTabbedPane t = (JTabbedPane) l.getView(); 
    if (t.indexAtLocation(pt.x, pt.y) >= 0) { 
     Point loc = e.getPoint(); 
     loc.translate(-16, -16); 
     l.repaint(new Rectangle(loc, new Dimension(32, 32))); 
    } 
    } 
}