textDirection property

TextDirection textDirection

The text direction with which to resolve alignment.

This may be changed to null, but only after the alignment and matchTextDirection properties have been changed to values that do 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;
  _markNeedResolution();
}