reverse property
Indicates whether the new child will visually appear on top of or underneath the old child.
When this is false, the new child will transition in on top of the old child while its primary animation and the secondary animation of the old child are running forward. This is similar to the transition associated with pushing a new PageRoute on top of another.
When this is true, the new child will transition in below the old child while its secondary animation and the primary animation of the old child are running in reverse. This is similar to the transition associated with popping a PageRoute to reveal a new PageRoute below it.
Implementation
final bool reverse;