minWidth property

double minWidth

The minimum width constraint to give the child. Set this to null (the default) to use the constraint from the parent instead.

Implementation 

double get minWidth => _minWidth;
void minWidth= (double value)

Implementation 

set minWidth(double value) {
  if (_minWidth == value)
    return;
  _minWidth = value;
  markNeedsLayout();
}