Show a horizontal JScrollBar in the tab area of a JTabbedPane-like component created with CardLayout

• download example.jar
• download src.zip
• repository

Code

class CardLayoutTabbedPane extends JPanel {
  private final CardLayout cardLayout = new CardLayout();
  private final JPanel tabPanel = new JPanel(new FlowLayout(FlowLayout.LEADING, 0, 0));
  private final JPanel contentsPanel = new JPanel(cardLayout);
  private final JButton hiddenTabs = new JButton("V");
  private final ButtonGroup group = new ButtonGroup();
  private final JScrollPane tabArea = new JScrollPane(tabPanel) {
    @Override public boolean isOptimizedDrawingEnabled() {
      return false; // JScrollBar is overlap
    }

    @Override public void updateUI() {
      super.updateUI();
      EventQueue.invokeLater(() -> {
        getVerticalScrollBar().setUI(new OverlappedScrollBarUI());
        getHorizontalScrollBar().setUI(new OverlappedScrollBarUI());
        setLayout(new OverlapScrollPaneLayout());
        setComponentZOrder(getVerticalScrollBar(), 0);
        setComponentZOrder(getHorizontalScrollBar(), 1);
        setComponentZOrder(getViewport(), 2);
      });
      setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
      setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
      getVerticalScrollBar().setOpaque(false);
      getHorizontalScrollBar().setOpaque(false);
      setBackground(Color.DARK_GRAY);
      setViewportBorder(BorderFactory.createEmptyBorder());
      setBorder(BorderFactory.createEmptyBorder());
    }

    @Override public Dimension getPreferredSize() {
      Dimension d = super.getPreferredSize();
      d.height = 18 + 6;
      return d;
    }
  };

  protected CardLayoutTabbedPane() {
    super(new BorderLayout());
    setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
    setBackground(new Color(16, 16, 16));
    tabPanel.setInheritsPopupMenu(true);
    hiddenTabs.setFont(hiddenTabs.getFont().deriveFont(8f));
    hiddenTabs.setBorder(BorderFactory.createEmptyBorder(2, 8, 2, 8));
    hiddenTabs.setOpaque(false);
    hiddenTabs.setFocusable(false);
    hiddenTabs.setContentAreaFilled(false);
    JPanel header = new JPanel(new BorderLayout());
    header.add(new JLayer<>(tabArea, new HorizontalScrollLayerUI()));
    header.add(hiddenTabs, BorderLayout.EAST);
    add(header, BorderLayout.NORTH);
    add(contentsPanel);
  }

  protected JComponent createTabComponent(String title, Icon icon) {
    JToggleButton tab = new TabButton();
    tab.setInheritsPopupMenu(true);
    group.add(tab);
    tab.addMouseListener(new MouseAdapter() {
      @Override public void mousePressed(MouseEvent e) {
        if (SwingUtilities.isLeftMouseButton(e)) {
          ((AbstractButton) e.getComponent()).setSelected(true);
          cardLayout.show(contentsPanel, title);
        }
      }
    });
    EventQueue.invokeLater(() -> tab.setSelected(true));

    JLabel label = new JLabel(title, icon, SwingConstants.LEADING);
    label.setForeground(Color.WHITE);
    label.setIcon(icon);
    label.setOpaque(false);

    JButton close = new JButton(new CloseTabIcon(new Color(0xB0_B0_B0))) {
      @Override public Dimension getPreferredSize() {
        return new Dimension(12, 12);
      }
    };
    close.addActionListener(e -> System.out.println("close button"));
    close.setBorder(BorderFactory.createEmptyBorder());
    close.setFocusable(false);
    close.setOpaque(false);
    // close.setFocusPainted(false);
    close.setContentAreaFilled(false);
    close.setPressedIcon(new CloseTabIcon(new Color(0xFE_FE_FE)));
    close.setRolloverIcon(new CloseTabIcon(new Color(0xA0_A0_A0)));

    tab.add(label);
    tab.add(close, BorderLayout.EAST);
    return tab;
  }

  public void addTab(String title, Icon icon, Component comp) {
    JComponent tab = createTabComponent(title, icon);
    tabPanel.add(tab);
    contentsPanel.add(comp, title);
    cardLayout.show(contentsPanel, title);
    EventQueue.invokeLater(() -> tabPanel.scrollRectToVisible(tab.getBounds()));
  }

  public JScrollPane getTabArea() {
    return tabArea;
  }

  @Override public void doLayout() {
    BoundedRangeModel m = tabArea.getHorizontalScrollBar().getModel();
    hiddenTabs.setVisible(m.getMaximum() - m.getExtent() > 0);
    super.doLayout();
  }
}

References

• Show a horizontal JScrollBar in the tab area of a JTabbedPane-like component created with CardLayout(Japanese)
• create JTabbedPane like component using CardLayout and JRadioButton(or JTableHeader)

Automatically extend its height when JTextArea gains focus

• download example.jar
• download src.zip
• repository

Code

textArea.addFocusListener(new FocusAdapter() {
  @Override public void focusLost(FocusEvent e) {
    String text = textArea.getText();
    label.setText(text.isEmpty() ? " " : text);
    cardLayout.show(cp, "TextField");
  }
});
label.addFocusListener(new FocusAdapter() {
  @Override public void focusGained(FocusEvent e) {
    cardLayout.show(cp, "TextArea");
    textArea.requestFocusInWindow();
  }
});

References

• Automatically extend its height when JTextArea gains focus(Japanese)
• java - It is posible to expand a JTextArea or JTextPane by clicking on it? - Stack Overflow

Show/Hide PasswordField

• download example.jar
• download src.zip
• repository

Code

JPasswordField pf = new JPasswordField(24);
pf.setText("abcdefghijklmn");
pf.setAlignmentX(Component.RIGHT_ALIGNMENT);
AbstractDocument doc = (AbstractDocument) pf.getDocument();
doc.setDocumentFilter(new ASCIIOnlyDocumentFilter());

AbstractButton b = new JToggleButton(new AbstractAction() {
  @Override public void actionPerformed(ActionEvent e) {
    AbstractButton c = (AbstractButton) e.getSource();
    Character ec = c.isSelected() ? 0
        : (Character) UIManager.get("PasswordField.echoChar");
    pf.setEchoChar(ec);
  }
});
b.setFocusable(false);
b.setOpaque(false);
b.setContentAreaFilled(false);
b.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 4));
b.setAlignmentX(Component.RIGHT_ALIGNMENT);
b.setAlignmentY(Component.CENTER_ALIGNMENT);
b.setIcon(new ColorIcon(Color.GREEN));
b.setRolloverIcon(new ColorIcon(Color.BLUE));
b.setSelectedIcon(new ColorIcon(Color.RED));
b.setRolloverSelectedIcon(new ColorIcon(Color.ORANGE));

JPanel panel = new JPanel() {
  @Override public boolean isOptimizedDrawingEnabled() {
    return false;
  }
};
panel.setLayout(new OverlayLayout(panel));
panel.add(b);
panel.add(pf);

References

• Show/Hide PasswordField using CardLayout(Japanese)

New Tab Button

• download example.jar
• download src.zip
• repository

Code

class TabLayout implements LayoutManager, Serializable {
  private static final long serialVersionUID = 1L;
  private static final int TAB_WIDTH = 100;
  @Override public void addLayoutComponent(String name, Component comp) {
    /* not needed */
  }

  @Override public void removeLayoutComponent(Component comp) {
    /* not needed */
  }

  @Override public Dimension preferredLayoutSize(Container parent) {
    synchronized (parent.getTreeLock()) {
      Insets insets = parent.getInsets();
      int last = parent.getComponentCount() - 1;
      int w = 0;
      int h = 0;
      if (last >= 0) {
        Component comp = parent.getComponent(last);
        Dimension d = comp.getPreferredSize();
        w = d.width;
        h = d.height;
      }
      return new Dimension(insets.left + insets.right + w,
                           insets.top + insets.bottom + h);
    }
  }

  @Override public Dimension minimumLayoutSize(Container parent) {
    synchronized (parent.getTreeLock()) {
      return new Dimension(100, 24);
    }
  }

  @Override public void layoutContainer(Container parent) {
    synchronized (parent.getTreeLock()) {
      int ncomponents = parent.getComponentCount();
      if (ncomponents == 0) {
        return;
      }
      // int nrows = 1;
      // boolean ltr = parent.getComponentOrientation().isLeftToRight();
      Insets insets = parent.getInsets();
      int ncols = ncomponents - 1;
      int lastw = parent.getComponent(ncomponents - 1).getPreferredSize().width;
      int width = parent.getWidth() - insets.left - insets.right - lastw;
      int h = parent.getHeight() - insets.top - insets.bottom;
      int w = width > TAB_WIDTH * ncols ? TAB_WIDTH : width / ncols;
      int gap = width - w * ncols;
      int x = insets.left;
      int y = insets.top;
      for (int i = 0; i < ncomponents; i++) {
        int cw = i == ncols ? lastw : w + (gap-- > 0 ? 1 : 0);
        parent.getComponent(i).setBounds(x, y, cw, h);
        x += cw;
      }
    }
  }

  @Override public String toString() {
    return getClass().getName();
  }
}

References

• XP Style Icons - Windows Application Icon, Software XP Icons
• New Tab Button(Japanese)

create JTabbedPane like component using CardLayout and JRadioButton(or JTableHeader)

• download example.jar
• download src.zip
• repository

Code

class CardLayoutTabbedPane extends JPanel {
  protected final CardLayout cardLayout = new CardLayout();
  protected final JPanel tabPanel = new JPanel(new GridLayout(1, 0, 0, 0));
  protected final JPanel wrapPanel = new JPanel(new BorderLayout(0, 0));
  protected final JPanel contentsPanel = new JPanel(cardLayout);
  protected final ButtonGroup bg = new ButtonGroup();

  public CardLayoutTabbedPane() {
    super(new BorderLayout());
    int left  = 1;
    int right = 3;
    tabPanel.setBorder(BorderFactory.createEmptyBorder(1, left, 0, right));
    contentsPanel.setBorder(BorderFactory.createEmptyBorder(4, left, 2, right));
    wrapPanel.add(tabPanel);
    wrapPanel.add(new JLabel("test:"), BorderLayout.WEST);
    add(wrapPanel, BorderLayout.NORTH);
    add(contentsPanel);
  }

  public void addTab(final String title, final Component comp) {
    JRadioButton b = new TabButton(new AbstractAction(title) {
      public void actionPerformed(ActionEvent e) {
        cardLayout.show(contentsPanel, title);
      }
    });
    tabPanel.add(b);
    bg.add(b);
    b.setSelected(true);
    contentsPanel.add(comp, title);
    cardLayout.show(contentsPanel, title);
  }
}

References

• create JTabbedPane like component using CardLayout and JRadioButton(or JTableHeader)(Japanese)