behavior property
final
How this gesture detector should behave during hit testing when deciding how the hit test propagates to children and whether to consider targets behind this one.
This defaults to HitTestBehavior.deferToChild if child is not null and HitTestBehavior.translucent if child is null.
See HitTestBehavior for the allowed values and their meanings.
Implementation
final HitTestBehavior? behavior;