onPop property
final
Called when a handleable pop event happens.
For example, a pop is handleable when a Navigator in child has multiple routes on its stack. It's not handleable when it has only a single route, and so onPop will not be called.
Typically this is used to pop the Navigator in child. See the sample code on NavigatorPopHandler for a full example of this.
Implementation
final VoidCallback? onPop;