Possible return values for {@link #getHorizontalAlignment}, and parameter values for {@link #setHorizontalAlignment}.

class HorizontalAlignmentConstant extends AutoHorizontalAlignmentConstant {

 static HorizontalAlignmentConstant endOf(Direction direction) {
   return direction == Direction.LTR ? HasHorizontalAlignment.ALIGN_RIGHT : direction == Direction.RTL ? HasHorizontalAlignment.ALIGN_LEFT : HasHorizontalAlignment.ALIGN_LOCALE_END;
 }

 static HorizontalAlignmentConstant startOf(Direction direction) {
   return direction == Direction.LTR ? HasHorizontalAlignment.ALIGN_LEFT : direction == Direction.RTL ? HasHorizontalAlignment.ALIGN_RIGHT : HasHorizontalAlignment.ALIGN_LOCALE_START;
 }

 final TextAlign _textAlign;

 const HorizontalAlignmentConstant(this._textAlign) : super.internal();

 /**
  * Gets the CSS 'text-align' string associated with this constant.
 *
  * @return the CSS 'text-align' value
  */
 String getTextAlignString() {
   return _textAlign.value;
 }
}