TextOverflow overflow

How visual overflow should be handled.

Source 

TextOverflow get overflow => _overflow;
void overflow=(TextOverflow value)

Source 

set overflow(TextOverflow value) {
  assert(value != null);
  if (_overflow == value)
    return;
  _overflow = value;
  _textPainter.ellipsis = value == TextOverflow.ellipsis ? _kEllipsis : null;
  markNeedsPaint();
}