Tab Navigation + Different Tab Stack Lengths

[skizzo]

Hi,
I'm trying to use this wonderful library to implement the Android Back Button functionality mentioned in this blog article.

Problem is, my use case is a little different, it can't automatically use the "last mounted" component I use for catching the back button event, it needs to use the one of the currently focused screen.

---

For example, this works:

1. Tab A: Tab A Root
2. Tab B: Tab B Root > Screen B <- focused, back button here, listener of Screen B called correcty
3. Tab C: Tab C Root

While this is not working:

1. Tab A: Tab A Root
2. Tab B: Tab B Root > Screen B <-- focused, back button here, listener of Subscreen C is called
3. Tab C: Tab C Root> Screen C > Subscreen C

Any ideas how this scenario could be handled? Thanks!