create a JCheckBox rollover effect in a JTable

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

Code

class RolloverBooleanRenderer extends JCheckBox implements TableCellRenderer, UIResource {
  private static final Border noFocusBorder = new EmptyBorder(1, 1, 1, 1);
  private final HighlightListener highlighter;

  public RolloverBooleanRenderer(HighlightListener highlighter) {
    super();
    this.highlighter = highlighter;
    setHorizontalAlignment(SwingConstants.CENTER);
    setBorderPainted(true);
    setRolloverEnabled(true);
    setOpaque(true);
  }

  @Override public Component getTableCellRendererComponent(JTable table, Object value,
        boolean isSelected, boolean hasFocus, int row, int column) {
    if (highlighter.isHighlightableCell(row, column)) {
      getModel().setRollover(true);
    } else {
      getModel().setRollover(false);
    }
    if (isSelected) {
      setForeground(table.getSelectionForeground());
      super.setBackground(table.getSelectionBackground());
    } else {
      setForeground(table.getForeground());
      setBackground(table.getBackground());
    }
    setSelected((value != null && ((Boolean) value).booleanValue()));
    if (hasFocus) {
      setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
    } else {
      setBorder(noFocusBorder);
    }
    return this;
  }
}

References

• create a JCheckBox rollover effect in a JTable(Japanese)

Translucent JFrame

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

Code

JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame();
// com.sun.awt.AWTUtilities.setWindowOpacity(frame, .5f);
com.sun.awt.AWTUtilities.setWindowOpaque(frame, false); // 6u14
// 1.7.0 frame.setBackground(new Color(0, 0, 0, 0));
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
JPanel p = new JPanel();
p.add(new JButton("JButton"));
p.setBackground(new Color(.5f, .8f, .5f, .5f));
frame.getContentPane().add(p);
frame.setSize(320, 240);
frame.setLocationRelativeTo(null);
frame.setVisible(true);

References

• Translucent JFrame(Japanese)
• www.viva-edo.com/komon/edokomon

Custom Decorated TitleBar JFrame

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

Code

class ResizeWindowListener extends MouseAdapter {
  private Rectangle startSide = null;
  private final JFrame frame;
  public ResizeWindowListener(JFrame frame) {
    this.frame = frame;
  }

  @Override public void mousePressed(MouseEvent e) {
    startSide = frame.getBounds();
  }

  @Override public void mouseDragged(MouseEvent e) {
    if (startSide == null) return;
    Component c = e.getComponent();
    if (c == topleft) {
      startSide.y += e.getY();
      startSide.height -= e.getY();
      startSide.x += e.getX();
      startSide.width -= e.getX();
    } else if (c == top) {
      startSide.y += e.getY();
      startSide.height -= e.getY();
    } else if (c == topright) {
      startSide.y += e.getY();
      startSide.height -= e.getY();
      startSide.width += e.getX();
    } else if (c == left) {
      startSide.x += e.getX();
      startSide.width -= e.getX();
    } else if (c == right) {
      startSide.width += e.getX();
    } else if (c == bottomleft) {
      startSide.height += e.getY();
      startSide.x += e.getX();
      startSide.width -= e.getX();
    } else if (c == bottom) {
      startSide.height += e.getY();
    } else if (c == bottomright) {
      startSide.height += e.getY();
      startSide.width += e.getX();
    }
    frame.setBounds(startSide);
  }
}

References

• Custom Decorated TitleBar JFrame(Japanese)
• Java Swing Tips: add JInternalFrame to Undecorated JFrame

JTabbedPane selected tab height

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

Code

class WindowsTabHeightTabbedPaneUI extends WindowsTabbedPaneUI {
  private static final int TAB_AREA_HEIGHT = 32;
  @Override protected int calculateTabHeight(
      int tabPlacement, int tabIndex, int fontHeight) {
    return TAB_AREA_HEIGHT;
  }
  @Override protected void paintTab(
      Graphics g, int tabPlacement, Rectangle[] rects,
      int tabIndex, Rectangle iconRect, Rectangle textRect) {
    if (tabPane.getSelectedIndex() != tabIndex
        && tabPlacement != JTabbedPane.LEFT
        && tabPlacement != JTabbedPane.RIGHT) {
      int tabHeight = TAB_AREA_HEIGHT / 2 + 3;
      rects[tabIndex].height = tabHeight;
      if (tabPlacement == JTabbedPane.TOP) {
        rects[tabIndex].y = TAB_AREA_HEIGHT - tabHeight + 3;
      }
    }
    super.paintTab(g, tabPlacement, rects, tabIndex, iconRect, textRect);
  }
}

References

• JTabbedPane selected tab height(Japanese)

Non Selectable JComboBox Items

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

Code

class DisableItemComboBox<E> extends JComboBox<E> {
  private final Set<Integer> disableIndexSet = new HashSet<>();
  private boolean isDisableIndex;
  private final Action up = new AbstractAction() {
    @Override public void actionPerformed(ActionEvent e) {
      int si = getSelectedIndex();
      for (int i = si - 1; i >= 0; i--) {
        if (!disableIndexSet.contains(i)) {
          setSelectedIndex(i);
          break;
        }
      }
    }
  };
  private final Action down = new AbstractAction() {
    @Override public void actionPerformed(ActionEvent e) {
      int si = getSelectedIndex();
      for (int i = si + 1; i < getModel().getSize(); i++) {
        if (!disableIndexSet.contains(i)) {
          setSelectedIndex(i);
          break;
        }
      }
    }
  };

  public DisableItemComboBox() {
    super();
  }

  public DisableItemComboBox(ComboBoxModel<E> aModel) {
    super(aModel);
  }

  public DisableItemComboBox(E[] items) {
    super(items);
  }

  @Override public void updateUI() {
    super.updateUI();
    setRenderer(new DefaultListCellRenderer() {
      @Override public Component getListCellRendererComponent(
          JList list, Object value, int index,
          boolean isSelected, boolean cellHasFocus) {
        Component c;
        if (disableIndexSet.contains(index)) {
          c = super.getListCellRendererComponent(
              list, value, index, false, false);
          c.setEnabled(false);
        } else {
          c = super.getListCellRendererComponent(
              list, value, index, isSelected, cellHasFocus);
          c.setEnabled(true);
        }
        return c;
      }
    });
    ActionMap am = getActionMap();
    am.put("selectPrevious3", up);
    am.put("selectNext3", down);
    InputMap im = getInputMap();
    im.put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0), "selectPrevious3");
    im.put(KeyStroke.getKeyStroke(KeyEvent.VK_KP_UP, 0), "selectPrevious3");
    im.put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0), "selectNext3");
    im.put(KeyStroke.getKeyStroke(KeyEvent.VK_KP_DOWN, 0), "selectNext3");
  }

  public void setDisableIndex(Set<Integer> set) {
    disableIndexSet.clear();
    for (Integer i: set) {
      disableIndexSet.add(i);
    }
  }

  @Override public void setPopupVisible(boolean v) {
    if (!v && isDisableIndex) {
      isDisableIndex = false;
    } else {
      super.setPopupVisible(v);
    }
  }

  @Override public void setSelectedIndex(int index) {
    if (disableIndexSet.contains(index)) {
      isDisableIndex = true;
    } else {
      // isDisableIndex = false;
      super.setSelectedIndex(index);
    }
  }
}

References

• Non Selectable JComboBox Items(Japanese)