Functionality to control route changes

[komakurae]

Currently, as far as I understood, there is no workaround to control when route is being popped or pushed or any other changes. For now it's only possible to know whether it has been popped or pushed etc.
What I actually need to do is to show dialog, when user tries to go to another screen with unsaved data, preventing the user from changing current route.

For now I can see only one solution - add PopScope... BUT for WEB its the issue

The problem here is to control back OR refresh button being pressed (html.BeforeUnloadEvent works only for refresh) + PopScope doens't work for navigateTo

If someone implemented such thing your help would be appreciated. Or if there is a solution with auto_route I think it would be nice to add it to examples.