fit property
How a flexible child is inscribed into the available space.
If flex
is non-zero, the fit determines whether the child fills the
space the parent makes available during layout. If the fit is
FlexFit.tight, the child is required to fill the available space. If the
fit is FlexFit.loose, the child can be at most as large as the available
space (but is allowed to be smaller).
Implementation
final FlexFit fit;