textDirection property

TextDirection textDirection

The text direction with which to resolve alignment.

This may be changed to null, but only after alignment has been changed to a value that does not depend on the direction.

Implementation 

TextDirection get textDirection => _textDirection;
void textDirection= (TextDirection value)

Implementation 

set textDirection(TextDirection value) {
  if (_textDirection == value)
    return;
  _textDirection = value;
  _clearPaintData();
  _markNeedResolution();
}