Disable the arrow button when the knob position of the JScrollBar is on the boundary

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

Code

// UIManager.put("ScrollBar.alwaysShowThumb", Boolean.TRUE);
JScrollPane scroll = new JScrollPane(new JTable(24, 3));
scroll.getVerticalScrollBar().addAdjustmentListener(e -> {
  JScrollBar scrollBar = (JScrollBar) e.getAdjustable();
  BoundedRangeModel m = scrollBar.getModel();
  int value = m.getValue();
  boolean max = value == m.getMaximum() - m.getExtent();
  Optional.ofNullable(scrollBar.getComponent(0))
      .ifPresent(b -> b.setEnabled(!max));
  boolean min = value == m.getMinimum();
  Optional.ofNullable(scrollBar.getComponent(1))
      .ifPresent(b -> b.setEnabled(!min));
});

References

• Disable the arrow button when the knob position of the JScrollBar is on the boundary(Japanese)

Rounded corner JComboBox border

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

Code

class RoundedCornerBorder extends AbstractBorder {
  @Override public void paintBorder(
      Component c, Graphics g, int x, int y, int width, int height) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    int r = 12;
    int w = width  - 1;
    int h = height - 1;
    Area round = new Area(new RoundRectangle2D.Float(x, y, w, h, r, r));
    Container parent = c.getParent();
    if (parent != null) {
      g2.setColor(parent.getBackground());
      Area corner = new Area(new Rectangle2D.Float(x, y, width, height));
      corner.subtract(round);
      g2.fill(corner);
    }
    g2.setPaint(c.getForeground());
    g2.draw(round);
    g2.dispose();
  }

  @Override public Insets getBorderInsets(Component c) {
    return new Insets(4, 8, 4, 8);
  }

  @Override public Insets getBorderInsets(Component c, Insets insets) {
    insets.left = insets.right = 8;
    insets.top = insets.bottom = 4;
    return insets;
  }
}

class KamabokoBorder extends RoundedCornerBorder {
  @Override public void paintBorder(
      Component c, Graphics g, int x, int y, int width, int height) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    int r = 12;
    int w = width  - 1;
    int h = height - 1;
    Path2D p = new Path2D.Float();
    p.moveTo(x, y + h);
    p.lineTo(x, y + r);
    p.quadTo(x, y, x + r, y);
    p.lineTo(x + w - r, y);
    p.quadTo(x + w, y, x + w, y + r);
    p.lineTo(x + w, y + h);
    p.closePath();
    Area round = new Area(p);
    Container parent = c.getParent();
    if (parent != null) {
      g2.setColor(parent.getBackground());
      Area corner = new Area(new Rectangle2D.Float(x, y, width, height));
      corner.subtract(round);
      g2.fill(corner);
    }
    g2.setPaint(c.getForeground());
    g2.draw(round);
    g2.dispose();
  }
}

References

• Rounded corner JComboBox border(Japanese)
• Rounding the corners of JScrollPane(Japanese)

SearchBar JComboBox

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

Code

public class BasicSearchBarComboBoxUI extends SearchBarComboBoxUI {
  protected boolean isEditable = true;
  public static javax.swing.plaf.ComponentUI createUI(JComponent c) {
    return new BasicSearchBarComboBoxUI();
  }

  @Override protected void installDefaults() {
    super.installDefaults();
    // comboBox.setEditable(true);
    comboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
    // comboBox.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
  }

  @Override protected LayoutManager createLayoutManager() {
    return new LayoutManager() {
      @Override public void addLayoutComponent(String name, Component comp) {
        /* not needed */
      }

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

      @Override public Dimension preferredLayoutSize(Container parent) {
        return parent.getPreferredSize();
      }

      @Override public Dimension minimumLayoutSize(Container parent) {
        return parent.getMinimumSize();
      }

      @Override public void layoutContainer(Container parent) {
        if (!(parent instanceof JComboBox)) {
          return;
        }
        JComboBox<?> cb = (JComboBox<?>) parent;
        Rectangle r = SwingUtilities.calculateInnerArea(cb, null);

        int arrowSize = 0;
        JButton arrowButton = (JButton) cb.getComponent(0);
        if (Objects.nonNull(arrowButton)) {
          Insets arrowInsets = arrowButton.getInsets();
          int bw = arrowButton.getPreferredSize().width + arrowInsets.left + arrowInsets.right;
          arrowButton.setBounds(r.x, r.y, bw, r.height);
          arrowSize = bw;
        }
        JButton loupeButton = null;
        for (Component c : cb.getComponents()) {
          if ("ComboBox.loupeButton".equals(c.getName())) {
            loupeButton = (JButton) c;
            break;
          }
        }
        int loupeSize = 0;
        if (Objects.nonNull(loupeButton)) {
          loupeSize = r.height;
          loupeButton.setBounds(r.x + r.width - loupeSize, r.y, loupeSize, r.height);
        }
        JTextField editor = (JTextField) cb.getEditor().getEditorComponent();
        if (Objects.nonNull(editor)) {
          editor.setBounds(r.x + arrowSize, r.y, r.width - arrowSize - loupeSize, r.height);
        }
      }
    };
  }
  // ...

References

• SearchBar JComboBox(Japanese)

Left Clipped JComboBox

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

Code

final JButton arrowButton = getArrowButton(combo02);
combo02.setRenderer(new DefaultListCellRenderer() {
  @Override public Component getListCellRendererComponent(
    JList list, Object value, int index,
    boolean isSelected, boolean cellHasFocus) {
    super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
    int itb = 0, ilr = 0;
    Insets insets = getInsets();
    itb += insets.top + insets.bottom;
    ilr += insets.left + insets.right;
    insets = combo02.getInsets();
    itb += insets.top + insets.bottom;
    ilr += insets.left + insets.right;
    int availableWidth = combo02.getWidth() - ilr;
    if (index < 0) {
      // @see BasicComboBoxUI#rectangleForCurrentValue
      int buttonSize = combo02.getHeight() - itb;
      if (arrowButton != null) {
        buttonSize = arrowButton.getWidth();
      }
      availableWidth -= buttonSize;
      JTextField tf = (JTextField) combo02.getEditor().getEditorComponent();
      insets = tf.getMargin();
      availableWidth -= (insets.left + insets.right);
    }
    String cellText = (value != null) ? value.toString() : "";
    // <blockquote cite="https://tips4java.wordpress.com/2008/11/12/left-dot-renderer/">
    // @title Left Dot Renderer
    // @auther Rob Camick
    FontMetrics fm = getFontMetrics(getFont());
    if (fm.stringWidth(cellText) > availableWidth) {
      String dots = "...";
      int textWidth = fm.stringWidth(dots);
      int nChars = cellText.length() - 1;
      while (nChars > 0) {
        textWidth += fm.charWidth(cellText.charAt(nChars));
        if (textWidth > availableWidth) break;
        nChars--;
      }
      setText(dots + cellText.substring(nChars + 1));
    }
    // </blockquote>
    return this;
  }
});

References

• Left Dot Renderer ≪ Java Tips Weblog
• Left Clipped JComboBox(Japanese)