JCheckBox Node JTree

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

Code

class CheckBoxNodeEditor extends TriStateCheckBox implements TreeCellEditor {
  private DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
  private final JPanel panel = new JPanel(new BorderLayout());
  private String str = null;
  public CheckBoxNodeEditor() {
    super();
    this.addActionListener(new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        // System.out.println("actionPerformed: stopCellEditing");
        stopCellEditing();
      }
    });
    panel.setFocusable(false);
    panel.setRequestFocusEnabled(false);
    panel.setOpaque(false);
    panel.add(this, BorderLayout.WEST);
    this.setOpaque(false);
  }

  @Override public Component getTreeCellEditorComponent(
      JTree tree, Object value, boolean isSelected,
      boolean expanded, boolean leaf, int row) {
    JLabel l = (JLabel) renderer.getTreeCellRendererComponent(
      tree, value, true, expanded, leaf, row, true);
    l.setFont(tree.getFont());
    if (value instanceof DefaultMutableTreeNode) {
      this.setEnabled(tree.isEnabled());
      this.setFont(tree.getFont());
      Object userObject = ((DefaultMutableTreeNode) value).getUserObject();
      if (userObject instanceof CheckBoxNode) {
        CheckBoxNode node = (CheckBoxNode) userObject;
        if (node.status == Status.INDETERMINATE) {
          setIcon(new IndeterminateIcon());
        } else {
          setIcon(null);
        }
        l.setText(node.label);
        setSelected(node.status == Status.SELECTED);
        str = node.label;
      }
      // panel.add(this, BorderLayout.WEST);
      panel.add(l);
      return panel;
    }
    return l;
  }

  @Override public Object getCellEditorValue() {
    return new CheckBoxNode(str, isSelected() ? Status.SELECTED : Status.DESELECTED);
  }

  @Override public boolean isCellEditable(EventObject e) {
    if (e instanceof MouseEvent && e.getSource() instanceof JTree) {
      MouseEvent me = (MouseEvent) e;
      JTree tree = (JTree) e.getSource();
      TreePath path = tree.getPathForLocation(me.getX(), me.getY());
      Rectangle r = tree.getPathBounds(path);
      if (r == null) {
        return false;
      }
      Dimension d = getPreferredSize();
      r.setSize(new Dimension(d.width, r.height));
      if (r.contains(me.getPoint())) {
        return true;
      }
    }
    return false;
  }

  @Override public void updateUI() {
    super.updateUI();
    setName("Tree.cellEditor");
    if (panel != null) {
      //panel.removeAll(); // ??? Change to Nimbus LnF, JDK 1.6.0
      panel.updateUI();
      //panel.add(this, BorderLayout.WEST);
    }
    // ???#1: JDK 1.6.0 bug??? @see 1.7.0 DefaultTreeCellRenderer#updateUI()
    // if (System.getProperty("java.version").startsWith("1.6.0")) {
    //   renderer = new DefaultTreeCellRenderer();
    // }
  }
// ...

References

• JCheckBox Node JTree(Japanese)

Sharing tabs between 2 JFrames

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

Code

class DropLocationLayerUI extends LayerUI<DnDTabbedPane> {
  private static final int LINEWIDTH = 3;
  private final Rectangle lineRect = new Rectangle();
  @Override public void paint(Graphics g, JComponent c) {
    super.paint(g, c);
    if (c instanceof JLayer) {
      JLayer layer = (JLayer) c;
      DnDTabbedPane tabbedPane = (DnDTabbedPane) layer.getView();
      DnDTabbedPane.DropLocation loc = tabbedPane.getDropLocation();
      if (loc != null && loc.isDroppable() && loc.getIndex() >= 0) {
        Graphics2D g2 = (Graphics2D) g.create();
        g2.setComposite(
            AlphaComposite.getInstance(AlphaComposite.SRC_OVER, .5f));
        g2.setColor(Color.RED);
        initLineRect(tabbedPane, loc);
        g2.fill(lineRect);
        g2.dispose();
      }
    }
  }

  private void initLineRect(JTabbedPane tabbedPane, DnDTabbedPane.DropLocation loc) {
    int index = loc.getIndex();
    int a = index == 0 ? 0 : 1;
    Rectangle r = tabbedPane.getBoundsAt(a * (index - 1));
    if (tabbedPane.getTabPlacement() == JTabbedPane.TOP
        || tabbedPane.getTabPlacement() == JTabbedPane.BOTTOM) {
      lineRect.setBounds(
        r.x - LINE_WIDTH / 2 + r.width * a, r.y, LINE_WIDTH, r.height);
    } else {
      lineRect.setBounds(
        r.x, r.y - LINE_WIDTH / 2 + r.height * a, r.width, LINE_WIDTH);
    }
  }
}

// ...
private final JLabel label = new JLabel() {
  @Override public boolean contains(int x, int y) {
    return false;
  }
};
private final JWindow dialog = new JWindow();
public TabTransferHandler() {
  dialog.add(label);
  // dialog.setAlwaysOnTop(true); // Web Start
  dialog.setOpacity(.5f);
  // com.sun.awt.AWTUtilities.setWindowOpacity(dialog, .5f); // JDK 1.6.0
  DragSource.getDefaultDragSource().addDragSourceMotionListener(
      new DragSourceMotionListener() {
    @Override public void dragMouseMoved(DragSourceDragEvent dsde) {
      Point pt = dsde.getLocation();
      pt.translate(5, 5); // offset
      dialog.setLocation(pt);
    }
  });
// ...

References

• Sharing tabs between 2 JFrames(Japanese)
• Free the pixel: GHOST drag and drop, over multiple windows

Dropdown menu button in the JTableHeader

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

Code

@Override public void mouseClicked(MouseEvent e) {
  JTableHeader header = (JTableHeader) e.getSource();
  JTable table = header.getTable();
  TableColumnModel columnModel = table.getColumnModel();
  int vci = columnModel.getColumnIndexAtX(e.getX());
  int mci = table.convertColumnIndexToModel(vci);
  TableColumn column = table.getColumnModel().getColumn(mci);
  Rectangle r = header.getHeaderRect(vci);
  Container c = (Container) getTableCellRendererComponent(table, "", true, true, -1, vci);
  // if (!isNimbus) {
  //   Insets i = c.getInsets();
  //   r.translate(r.width - i.right, 0);
  // } else {
  r.translate(r.width - BUTTON_WIDTH, 0);
  r.setSize(BUTTON_WIDTH, r.height);
  Point pt = e.getPoint();
  if (c.getComponentCount() > 0 && r.contains(pt) && pop != null) {
    pop.show(header, r.x, r.height);
    JButton b = (JButton) c.getComponent(0);
    b.doClick();
    e.consume();
  }
}

@Override public void mouseExited(MouseEvent e) {
  rolloverIndex = -1;
}

@Override public void mouseMoved(MouseEvent e) {
  JTableHeader header = (JTableHeader) e.getSource();
  JTable table = header.getTable();
  TableColumnModel columnModel = table.getColumnModel();
  int vci = columnModel.getColumnIndexAtX(e.getX());
  int mci = table.convertColumnIndexToModel(vci);
  rolloverIndex = mci;
}

References

• Dropdown menu button in the JTableHeader(Japanese)

JTable group directories first sorting

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

Code

// > dir /O:GN
// > ls --group-directories-first
class FileGroupComparator extends DefaultFileComparator {
  private static final long serialVersionUID = 1L;
  private final JTable table;
  public FileGroupComparator(JTable table, int column) {
    super(column);
    this.table = table;
  }

  @Override public int compare(File a, File b) {
    int flag = 1;
    List<? extends TableRowSorter.SortKey> keys =
        table.getRowSorter().getSortKeys();
    if (!keys.isEmpty()) {
      TableRowSorter.SortKey sortKey = keys.get(0);
      if (sortKey.getColumn() == column &&
          sortKey.getSortOrder() == SortOrder.DESCENDING) {
        flag = -1;
      }
    }
    if (a.isDirectory() && !b.isDirectory()) {
      return -1 * flag;
    } else if (!a.isDirectory() && b.isDirectory()) {
      return 1 * flag;
    } else {
      return super.compare(a, b);
    }
  }
}

References

• JTable group directories first sorting(Japanese)

fixed width JButtons in bottom right corner of the JPanel

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

Code

private static JComponent createRightAlignButtonBox2(
  List<JButton> list, final int buttonWidth, int gap) {
  JComponent box = new JPanel() {
    @Override public void updateUI() {
      for (JButton b : list) {
        b.setPreferredSize(null);
      }
      super.updateUI();
      EventQueue.invokeLater(new Runnable() {
        @Override public void run() {
          int maxHeight = list.stream()
            .map(b -> b.getPreferredSize().height)
            .reduce(0, Integer::max);
          Dimension d = new Dimension(buttonWidth, maxHeight);
          for (JButton b : list) {
            b.setPreferredSize(d);
          }
          revalidate();
        }
      });
    }
  };
  box.setLayout(new BoxLayout(box, BoxLayout.X_AXIS));
  box.add(Box.createHorizontalGlue());
  for (JButton b : list) {
    box.add(b);
    box.add(Box.createHorizontalStrut(gap));
  }
  box.setBorder(BorderFactory.createEmptyBorder(gap, 0, gap, 0));
  return box;
}

References

• fixed width JButtons in bottom right corner of the JPanel(Japanese)