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kotlinlang

Hi, I made a copy of the <https://github.com/arkivanov/Decompose/blob/master/decompose/src/commonMain/kotlin/com/arkivanov/decompose/router/panels/ChildPanelsFactory.kt|ChildPanelsFactory.kt> and added a new parameter to `childPanels()` called `backHandler` . As the name suggested, it allows the user to provide a customized back handler, and one of the handlers I provided is that in a `MultiModeChildPanelsBackHandler` where in triple mode, pressing back goes to dual mode, and dual to single.

<https://gist.github.com/CXwudi/03c5c7fae17518912b305f4e4b0423ea>

Let me know what do you thought

Perhaps, you could still use the default implementation. And in your component you can register a BackCallback that changes the panels mode. You need to observe the ChildPanels state and enable/disable the callback accordingly.

Ahhh, I need to manually enable/disabled callback accordingly based on the state. That's why i see that when using the BackCallback, it always prevent the parent back button handling

Yeah, the API is similar to Jetpack OnBackPressedDispatcher.