Dispose widget when navigating to new route

Question

I have two screens in my app.

Screen A runs a computationally expensive operation while opened, and properly disposes by cancelling animations/subscriptions to the datab

Answer 1

I know it's a bit late but I think you should override the deactivate method. Since we are changing the page we are not actually destroying it, that's why the dispose isn't being called.

If you'd like more information this page lists the lifecycle of the stateful widgets.

From the link:

'deactivate()' is called when State is removed from the tree, but it might be reinserted before the current frame change is finished. This method exists basically because State objects can be moved from one point in a tree to another.