Detect if GoBack() was called in NavigationContext

Question

In a view that implements IConfirmNavigationRequest I am using four navigation transition animations: ForwardIn, ForwardOut, BackwardIn, and BackwardOut.

I'm using the ConfirmNavigationRequest to wait for the Out transition to finish before navigating. But, depending on the type of navigation - forward using RequestNavigate() or backward using GoBack() - I want to play different storyboards:

    public void ConfirmNavigationRequest(NavigationContext navigationContext, Action<bool> continuationCallback)
    {
        Storyboard storyboard;

        if (navigationContext./* was RequestNavigate() or GoBack() called? */)
        {
            // GoBack navigation request.
            storyboard = ((Storyboard)FindResource(RegionTransitions.BackwardOut));
        }
        else
        {
            // Forward navigation request.
            storyboard = ((Storyboard)FindResource(RegionTransitions.ForwardOut));
        }

        storyboard.Completed += (sender, args) => continuationCallback(true);
        storyboard.Begin();
    }

Is there any accurate and predictable way to detect which type of navigation was used from the NavigationContext?

Edit: I've since abandoned using IConfirmNavigation for transitions and am now using an AnimatedContentControl.

I don't really like it, but I'm publishing an event to 'warn' the AnimatedContentControl that the next navigation should use a specific transition:

_eventAggregator.GetEvent<RegionTransitionEvent>().Publish(new RegionTransitionEventArgs { RegionName = RegionNames.NavRegion, RegionTransition = RegionTransitions.BackwardIn });

_regionManager.RequestNavigate(RegionNames.ContentRegion, ViewNames.ABC);

Answer 1

You can implement the INavigationAware interface in your view or viewmodel.

This interface will implement 3 methods.

public interface INavigationAware
{
    void OnNavigatedTo(NavigationContext navigationContext);
    bool IsNavigationTarget(NavigationContext navigationContext);
    void OnNavigatedFrom(NavigationContext navigationContext);
}

the will allow you to determine if it is navigation to and from somewhere. you can even determine of which view the navigation comes from.