Copy on select for JTextArea

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

Code

class CopyOnSelectListener
    extends MouseAdapter
    implements CaretListener, KeyListener {
  private boolean dragActive;
  private boolean shiftActive;
  private int dot;
  private int mark;

  @Override public final void caretUpdate(CaretEvent e) {
    if (!dragActive) {
      fire(e.getSource());
    }
  }

  @Override public final void mousePressed(MouseEvent e) {
    dragActive = true;
  }

  @Override public final void mouseReleased(MouseEvent e) {
    dragActive = false;
    fire(e.getSource());
  }

  @Override public void keyPressed(KeyEvent e) {
    shiftActive = (e.getModifiersEx() & KeyEvent.SHIFT_DOWN_MASK) != 0;
  }

  @Override public void keyReleased(KeyEvent e) {
    shiftActive = (e.getModifiersEx() & KeyEvent.SHIFT_DOWN_MASK) != 0;
    if (!shiftActive) {
      fire(e.getSource());
    }
  }

  @Override public void keyTyped(KeyEvent e) {
    /* empty */
  }

  private void fire(Object c) {
    if (c instanceof JTextComponent) {
      JTextComponent tc = (JTextComponent) c;
      Caret caret = tc.getCaret();
      int d = caret.getDot();
      int m = caret.getMark();
      if (d != m && (dot != d || mark != m)) {
        String str = tc.getSelectedText();
        if (Objects.nonNull(str)) {
          // StringSelection data = new StringSelection(str);
          // Toolkit tk = Toolkit.getDefaultToolkit();
          // tk.getSystemClipboard().setContents(data, data);
          tc.copy();
        }
      }
      dot = d;
      mark = m;
    }
  }
}

References

• Copy on select for JTextArea(Japanese)

Show JToolTip for Icons placed in the cell of the JTable

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

Code

JTable table = new JTable(model) {
  @Override public String getToolTipText(MouseEvent e) {
    Point pt = e.getPoint();
    int vrow = rowAtPoint(pt);
    int vcol = columnAtPoint(pt);
    int mcol = convertColumnIndexToModel(vcol);
    if (mcol == 1) {
      TableCellRenderer tcr = getCellRenderer(vrow, vcol);
      Component c = prepareRenderer(tcr, vrow, vcol);
      if (c instanceof JPanel) {
        Rectangle r = getCellRect(vrow, vcol, true);
        c.setBounds(r);
        c.doLayout();
        pt.translate(-r.x, -r.y);
        Component l = SwingUtilities.getDeepestComponentAt(c, pt.x, pt.y);
        if (l instanceof JLabel) {
          ImageIcon icon = (ImageIcon) ((JLabel) l).getIcon();
          return icon.getDescription();
        }
      }
    }
    return super.getToolTipText(e);
  }
};

class ListIconRenderer implements TableCellRenderer {
  private final JPanel p = new JPanel(new FlowLayout(FlowLayout.LEFT));

  @Override public Component getTableCellRendererComponent(
      JTable table, Object value,
      boolean isSelected, boolean hasFocus, int row, int column) {
    p.removeAll();
    if (isSelected) {
      p.setOpaque(true);
      p.setBackground(table.getSelectionBackground());
    } else {
      p.setOpaque(false);
    }
    if (value instanceof List<?>) {
      for (Object o : (List<?>) value) {
        if (o instanceof Icon) {
          Icon icon = (Icon) o;
          JLabel label = new JLabel(icon);
          label.setToolTipText(icon.toString());
          p.add(label);
        }
      }
    }
    return p;
  }
}

References

• java - Tool tip in JPanel in JTable not working - Stack Overflow
• Show JToolTip for Icons placed in the cell of the JTable(Japanese)