widthFactor property
If non-null, sets its width to the child's width multiplied by this factor.
Can be both greater and less than 1.0 but must be positive.
Implementation
double get widthFactor => _widthFactor;
Implementation
set widthFactor(double value) {
assert(value == null || value >= 0.0);
if (_widthFactor == value)
return;
_widthFactor = value;
markNeedsLayout();
}