widthFactor property
final
        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
final double widthFactor
        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.
final double widthFactor