How to use

updateTextDirection

method

in

org.eclipse.swt.widgets.Item

@Override
boolean updateTextDirection(int textDirection) {
  /* AUTO is handled by super */
  if (super.updateTextDirection(textDirection) && text.length() != 0) {
    _setText (text);
    return true;
  }
  return false;
}

/**
 * Sets the receiver's text.
 * <p>
 * Note: If control characters like '\n', '\t' etc. are used
 * in the string, then the behavior is platform dependent.
 * </p>
 * @param string the new text
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the text is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setText (String string) {
  checkWidget ();
  if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
  text = string;
  if ((state & HAS_AUTO_DIRECTION) != 0) {
    updateTextDirection (AUTO_TEXT_DIRECTION);
  }
}

/**
 * Sets the receiver's text.
 * <p>
 * Note: If control characters like '\n', '\t' etc. are used
 * in the string, then the behavior is platform dependent.
 * </p>
 * @param string the new text
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the text is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setText (String string) {
  checkWidget ();
  if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
  text = string;
  if ((state & HAS_AUTO_DIRECTION) != 0) {
    updateTextDirection (AUTO_TEXT_DIRECTION);
  }
}

/**
 * Sets the receiver's text.
 * <p>
 * Note: If control characters like '\n', '\t' etc. are used
 * in the string, then the behavior is platform dependent.
 * </p>
 * @param string the new text
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the text is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setText (String string) {
  checkWidget ();
  if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
  text = string;
  if ((state & HAS_AUTO_DIRECTION) != 0) {
    updateTextDirection (AUTO_TEXT_DIRECTION);
  }
}

/**
 * Sets the receiver's text.
 * <p>
 * Note: If control characters like '\n', '\t' etc. are used
 * in the string, then the behavior is platform dependent.
 * </p>
 * @param string the new text
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the text is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setText (String string) {
  checkWidget ();
  if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
  text = string;
  if ((state & HAS_AUTO_DIRECTION) != 0) {
    updateTextDirection (AUTO_TEXT_DIRECTION);
  }
}

@Override
boolean updateTextDirection(int textDirection) {
  /* AUTO is handled by super */
  if (super.updateTextDirection(textDirection) && OS.IsUnicode) {
    int index = parent.indexOf (this);
    if (index != -1) {
      if ((textDirection & SWT.RIGHT_TO_LEFT) != 0) {
        _setText(index, RLE + text);
        return true;
      } else if ((textDirection & SWT.LEFT_TO_RIGHT) != 0) {
        _setText(index, LRE + text);
        return true;
      }
    }
  }
  return false;
}