canTransitionFrom method

@override bool canTransitionFrom(TransitionRoute previousRoute)

Returns true if previousRoute should animate when this route is pushed on top of it or when then this route is popped off of it.

Subclasses can override this method to restrict the set of routes they need to coordinate transitions with.

If true, and previousRoute.canTransitionTo() is true, then the previous route's ModalRoute.buildTransitions secondaryAnimation will run from 0.0 - 1.0 when this route is pushed on top of it. Similarly, if this route is popped off of previousRoute the previous route's secondaryAnimation will run from 1.0 - 0.0.

If false, then the previous route's ModalRoute.buildTransitions secondaryAnimation value will be kAlwaysDismissedAnimation. In other words previousRoute will not animate when this route is pushed on top of it or when then this route is popped off of it.

Returns true by default.

See also:

• canTransitionTo, which must be true for previousRoute for its ModalRoute.buildTransitions secondaryAnimation to run.

Implementation

@override
bool canTransitionFrom(TransitionRoute<dynamic> previousRoute) =>
    canTransitionFromPredicate?.call(previousRoute) ?? false;