alignment property

AlignmentGeometry alignment

The alignment of the origin, relative to the size of the box.

This is equivalent to setting an origin based on the size of the box. If it is specified at the same time as an offset, both are applied.

An AlignmentDirectional.start value is the same as an Alignment whose Alignment.x value is -1.0 if textDirection is TextDirection.ltr, and 1.0 if textDirection is TextDirection.rtl. Similarly AlignmentDirectional.end is the same as an Alignment whose Alignment.x value is 1.0 if textDirection is TextDirection.ltr, and -1.0 if textDirection is TextDirection.rtl.

Implementation 

AlignmentGeometry get alignment => _alignment;
void alignment= (AlignmentGeometry value)

Implementation 

set alignment(AlignmentGeometry value) {
  if (_alignment == value)
    return;
  _alignment = value;
  markNeedsPaint();
  markNeedsSemanticsUpdate();
}