Make it easier to customize RerouteController

[morethal]

Right now the RerouteController relies on a lot of internal classes of the NavigationSDK, that way it is pretty hard to change the implementation of the RerouteController.

[Guardiola31337]

cc @kmadsen for visibility

[kmadsen]

Hi @morethal, happy to see you're using this and have some ideas for how to improve the interface.

Can you share what exactly you're trying to do, please overshare the details 😄

[morethal]

My goal was to write a custom RerouteController to have a custom mechanism to (1) define when a user is off route and to (2) when and how a new route is calculated.

When I tried it, it was really hard, because the internal RerouteController knows a lot about the current state, but that information is really hard to get when extending a class.

I think what I did back then was to implement the RouteProgressObserver (it was called something like that) and the RerouteController. That allowed me to have at least a bit of information, but I think it was still significantly less than what is available in the internal class.

IIRC, something I wasn't able to do was to (1) define when a user is off route.

This is also somewhat related to #3965

[stale[bot]]

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