Change the selection focus Border of JTabbedPane to underline

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

Code

class UnderlineFocusTabbedPane extends JTabbedPane {
  private static final Border DEFAULT_BORDER =
      BorderFactory.createMatteBorder(0, 0, 3, 0, new Color(0x0, true));
  private static final Border SELECTED_BORDER =
      BorderFactory.createMatteBorder(0, 0, 3, 0, new Color(0x00_AA_FF));

  protected UnderlineFocusTabbedPane() {
    super();
  }

  @Override public void updateUI() {
    super.updateUI();
    // setFocusable(false);
    if (getUI() instanceof WindowsTabbedPaneUI) {
      setUI(new WindowsTabbedPaneUI() {
        @Override protected void paintFocusIndicator(
            Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex,
            Rectangle iconRect, Rectangle textRect, boolean isSelected) {
          super.paintFocusIndicator(g, tabPlacement, rects, tabIndex, iconRect, textRect, false);
        }
      });
    } else {
      setUI(new BasicTabbedPaneUI() {
        @Override protected void paintFocusIndicator(
            Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex,
            Rectangle iconRect, Rectangle textRect, boolean isSelected) {
          super.paintFocusIndicator(g, tabPlacement, rects, tabIndex, iconRect, textRect, false);
        }
      });
    }
    addChangeListener(e -> {
      JTabbedPane tabbedPane = (JTabbedPane) e.getSource();
      if (tabbedPane.getTabCount() <= 0) {
        return;
      }
      int idx = tabbedPane.getSelectedIndex();
      for (int i = 0; i < tabbedPane.getTabCount(); i++) {
        Component c = tabbedPane.getTabComponentAt(i);
        if (c instanceof JComponent) {
          ((JComponent) c).setBorder(i == idx ? SELECTED_BORDER : DEFAULT_BORDER);
        }
      }
    });
  }

  @Override public void insertTab(
      String title, Icon icon, Component component, String tip, int index) {
    super.insertTab(title, icon, component, tip, index);
    JLabel label = new JLabel(title, icon, SwingConstants.CENTER);
    setTabComponentAt(index, label);
  }
}

References

• Change the selection focus Border of JTabbedPane to underline(Japanese)

Set Sudoku style border lines created by MatteBorder as cell ruled lines of JTable

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

Code

static class SudokuCellRenderer extends DefaultTableCellRenderer {
  private final Font font;
  private final Font bold;
  private final Border b0 = BorderFactory.createMatteBorder(
      0, 0, BORDERWIDTH1, BORDERWIDTH1, Color.GRAY);
  private final Border b1 = BorderFactory.createMatteBorder(
      0, 0, BORDERWIDTH2, BORDERWIDTH2, Color.BLACK);
  private final Border b2 = BorderFactory.createCompoundBorder(
      BorderFactory.createMatteBorder(0, 0, BORDERWIDTH2, 0, Color.BLACK),
      BorderFactory.createMatteBorder(0, 0, 0, BORDERWIDTH1, Color.GRAY));
  private final Border b3 = BorderFactory.createCompoundBorder(
      BorderFactory.createMatteBorder(0, 0, 0, BORDERWIDTH2, Color.BLACK),
      BorderFactory.createMatteBorder(0, 0, BORDERWIDTH1, 0, Color.GRAY));
  private final Integer[][] data;
  protected SudokuCellRenderer(Integer[][] src, Font font) {
    super();
    this.font = font;
    this.bold = font.deriveFont(Font.BOLD);
    Integer[][] dest = new Integer[src.length][src[0].length];
    for (int i = 0; i < src.length; i++) {
      System.arraycopy(src[i], 0, dest[i], 0, src[0].length);
    }
    this.data = dest;
  }
  @Override public Component getTableCellRendererComponent(
      JTable table, Object value, boolean isSelected, boolean hasFocus,
      int row, int column) {
    boolean isEditable = data[row][column] == 0;
    super.getTableCellRendererComponent(
        table, value, isEditable && isSelected, hasFocus, row, column);
    if (isEditable && Objects.equals(value, 0)) {
      this.setText(" ");
    }
    setFont(isEditable ? font : bold);
    setHorizontalAlignment(CENTER);
    boolean rf = (row + 1) % 3 == 0;
    boolean cf = (column + 1) % 3 == 0;
    if (rf && cf) {
      setBorder(b1);
    } else if (rf) {
      setBorder(b2);
    } else if (cf) {
      setBorder(b3);
    } else {
      setBorder(b0);
    }
    return this;
  }
}

References

• Set Sudoku style border lines created by MatteBorder as cell ruled lines of JTable(Japanese)

JScrollBar search highlighter

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

Code

Override WindowsScrollBarUI#paintTrack(...)

scrollbar.setUI(new WindowsScrollBarUI() {
  @Override protected void paintTrack(
      Graphics g, JComponent c, Rectangle trackBounds) {
    super.paintTrack(g, c, trackBounds);

    Rectangle rect = textArea.getBounds();
    double sy = trackBounds.getHeight() / rect.getHeight();
    AffineTransform at = AffineTransform.getScaleInstance(1.0, sy);
    Highlighter highlighter = textArea.getHighlighter();
    g.setColor(Color.YELLOW);
    try {
      for (Highlighter.Highlight hh : highlighter.getHighlights()) {
        Rectangle r = textArea.modelToView(hh.getStartOffset());
        Rectangle s = at.createTransformedShape(r).getBounds();
        int h = 2; // Math.max(2, s.height - 2);
        g.fillRect(trackBounds.x, trackBounds.y + s.y, trackBounds.width, h);
      }
    }catch (BadLocationException ex) {
      ex.printStackTrace();
    }
  }
});

JLabel + Icon + RowHeader

Code

final JScrollPane scroll = new JScrollPane(textArea);
JLabel label = new JLabel(new Icon() {
  private final Color THUMB_COLOR = new Color(0, 0, 255, 50);
  private final Rectangle thumbRect = new Rectangle();
  private final JTextComponent textArea;
  private final JScrollBar scrollbar;

  public HighlightIcon(JTextComponent textArea, JScrollBar scrollbar) {
    this.textArea = textArea;
    this.scrollbar = scrollbar;
  }

  @Override public void paintIcon(Component c, Graphics g, int x, int y) {
    // Rectangle rect   = textArea.getBounds();
    // Dimension sbSize = scrollbar.getSize();
    // Insets sbInsets  = scrollbar.getInsets();
    // double sy = (sbSize.height - sbInsets.top - sbInsets.bottom) / rect.getHeight();
    int itop = scrollbar.getInsets().top;
    BoundedRangeModel range = scrollbar.getModel();
    double sy = range.getExtent() / (double) (range.getMaximum() - range.getMinimum());
    AffineTransform at = AffineTransform.getScaleInstance(1.0, sy);
    Highlighter highlighter = textArea.getHighlighter();

    // paint Highlight
    g.setColor(Color.RED);
    try {
      for (Highlighter.Highlight hh: highlighter.getHighlights()) {
        Rectangle r = textArea.modelToView(hh.getStartOffset());
        Rectangle s = at.createTransformedShape(r).getBounds();
        int h = 2; // Math.max(2, s.height - 2);
        g.fillRect(x, y + itop + s.y, getIconWidth(), h);
      }
    } catch (BadLocationException e) {
      e.printStackTrace();
    }

    // paint Thumb
    if (scrollbar.isVisible()) {
      // JViewport vport = Objects.requireNonNull(
      //   (JViewport) SwingUtilities.getAncestorOfClass(JViewport.class, textArea));
      // Rectangle thumbRect = vport.getBounds();
      thumbRect.height = range.getExtent();
      thumbRect.y = range.getValue(); // vport.getViewPosition().y;
      g.setColor(THUMB_COLOR);
      Rectangle s = at.createTransformedShape(thumbRect).getBounds();
      g.fillRect(x, y + itop + s.y, getIconWidth(), s.height);
    }
  }

  @Override public int getIconWidth() {
    return 8;
  }

  @Override public int getIconHeight() {
    JViewport vport = Objects.requireNonNull(
      (JViewport) SwingUtilities.getAncestorOfClass(JViewport.class, textArea));
    return vport.getHeight();
  }
});

scroll.setVerticalScrollBar(scrollbar);
/*
// Fixed Versions: 7 (b134)
scroll.setRowHeaderView(label);
/*/
// 6826074 JScrollPane does not revalidate the component hierarchy after scrolling
// https://bugs.openjdk.org/browse/JDK-6826074
// Affected Versions: 6u12,6u16,7
JViewport vp = new JViewport() {
  @Override public void setViewPosition(Point p) {
    super.setViewPosition(p);
    revalidate();
  }
};
vp.setView(label);
scroll.setRowHeader(vp);

MatteBorder + Icon + RowHeader

Code

JScrollBar scrollBar = new JScrollBar(Adjustable.VERTICAL) {
  @Override public Dimension getPreferredSize() {
    Dimension d = super.getPreferredSize();
    d.width += getInsets().left;
    return d;
  }

  @Override public void updateUI() {
    super.updateUI();
    setBorder(BorderFactory.createMatteBorder(0, 4, 0, 0, new Icon() {
      @Override public void paintIcon(Component c, Graphics g, int x, int y) {
        // ...
      }

      @Override public int getIconWidth() {
        return getInsets().left;
      }

      @Override public int getIconHeight() {
        return getHeight();
      }
    }));
  }
};
scroll.setVerticalScrollBar(scrollBar);

References

• JScrollBar search highlighter(Japanese)

create a gradient titled separator

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

Code

class TitledSeparator extends JLabel {
  private final String title;
  private final Color target;
  private final int height;
  private final int titlePosition;

  public TitledSeparator(String title, int height, int titlePosition) {
    this(title, null, height, titlePosition);
  }

  public TitledSeparator(
      String title, Color target, int height, int titlePosition) {
    super();
    this.title = title;
    this.target = target;
    this.height = height;
    this.titlePosition = titlePosition;
    updateBorder();
  }

  private void updateBorder() {
    Icon icon = new TitledSeparatorIcon();
    setBorder(BorderFactory.createTitledBorder(
        BorderFactory.createMatteBorder(height, 0, 0, 0, icon), title,
        TitledBorder.DEFAULT_JUSTIFICATION, titlePosition));
  }

  @Override public Dimension getMaximumSize() {
    Dimension d = super.getPreferredSize();
    d.width = Short.MAX_VALUE;
    return d;
  }

  @Override public void updateUI() {
    super.updateUI();
    EventQueue.invokeLater(this::updateBorder);
  }

  private class TitledSeparatorIcon implements Icon {
    private int width = -1;
    private Paint painter1;
    private Paint painter2;

    @Override public void paintIcon(Component c, Graphics g, int x, int y) {
      int w = c.getWidth();
      if (w != width || painter1 == null || painter2 == null) {
        width = w;
        Point2D start = new Point2D.Float();
        Point2D end = new Point2D.Float(width, 0);
        float[] dist = {0f, 1f};
        Color ec = Optional.ofNullable(getBackground())
            .orElse(UIManager.getColor("Panel.background"));
        Color sc = Optional.ofNullable(target).orElse(ec);
        painter1 = new LinearGradientPaint(
            start, end, dist, new Color[] {sc.darker(), ec});
        painter2 = new LinearGradientPaint(
            start, end, dist, new Color[] {sc.brighter(), ec});
      }
      int h = getIconHeight() / 2;
      Graphics2D g2  = (Graphics2D) g.create();
      g2.setPaint(painter1);
      g2.fillRect(x, y, width, getIconHeight());
      g2.setPaint(painter2);
      g2.fillRect(x, y + h, width, getIconHeight() - h);
      g2.dispose();
    }

    @Override public int getIconWidth() {
      return 200; // sample width
    }

    @Override public int getIconHeight() {
      return height;
    }
  }
}

References

• create a gradient titled separator(Japanese)