<@UHAJKUSTU> `handleBackButton` seems to not be wo...

# decompose

[Vaibhav Jaiswal]

@Arkadii Ivanov handleBackButton seems to not be working with bottom sheets, I have these 2 use cases, in which back button does not work
• When I use SlotNavigation to show a bottom sheet
• When i use StackNavigation inside a BottomSheet

[Arkadii Ivanov]

I'm pretty sure it should work on Android. Would be nice to have a reproducer.

[Arkadii Ivanov]

You may also check the docs: https://arkivanov.github.io/Decompose/component/back-button/#callback-order

There might be something that intercepts the back button.

[Vaibhav Jaiswal]

1. For the 1st usecase of showing sheet

val navigation = SlotNavigation<DuplicateNewsConfig>()
internal val slot = component.childSlot(
    source = navigation,
    handleBackButton = true,
    serializer = DuplicateNewsConfig.serializer()
) { config, context ->
    DuplicateNewsComponent(config.newsId, context) { news ->
        navigation.dismiss {
            if (!it) return@dismiss
            onNewsSelect(news)
        }
    }
}

And this is how I display the sheet

duplicateNewsSlot.child?.instance?.also {
    val sheetState = rememberModalBottomSheetState()
    DuplicateNewsBottomSheet(
        component = it,
        sheetState = sheetState,
        onDismiss = {
            scope.launch { sheetState.hide() }
                .invokeOnCompletion { component.onDuplicateNewsDismiss() }
        }
    )
}

[Arkadii Ivanov]

Oh, I guess onDismiss should work? Or is it not working? If the Composable DuplicateNewsBottomSheet installs BackHandler {}, then it would intercept the Child Slot's handleBackButton, I guess. Would it be possible to provide a complete reproducer project?

[Vaibhav Jaiswal]

Yeah sure,

[Vaibhav Jaiswal]

@Arkadii Ivanov I think this is some bug in compose itself
I tried the exact same code shown here and back press does not close the modal bottom sheet

[Arkadii Ivanov]

Indeed, I remember some issues with it. It might be intercepting the back button and doing nothing. But I couldn't find any tickets (filed bugs) about it.

[Arkadii Ivanov]

Worth trying some latest versions of compose. This might be already fixed.

[Vaibhav Jaiswal]

For the 2nd use case, where I have a stack navigation inside a bottom sheet, back button does not pop the top config

[Arkadii Ivanov]

That might be due to the same reason?

[Arkadii Ivanov]

You can try using BackHandler {} inside the sheet, and pop manually.

[Vaibhav Jaiswal]

Hey, you were right
Its fixed in CMP 1.6.2
I was in 1.5.11

[Vaibhav Jaiswal]

But still
In 2nd use case, back button closes the modal rathet than popping from stack nav
How can i handle this?

[Vaibhav Jaiswal]

I want it to first pop till last config, and then the modal should close

[Vaibhav Jaiswal]

Isnt the back handler of StackNav attached the last so it should override the default one?

[Arkadii Ivanov]

Yep, it looks like the sheet installs it's own back handler and intercepts. You can try installing your own BackHandler {} inside the sheet and pop manually.

[Arkadii Ivanov]

Those modal sheets are quite painful.

[Vaibhav Jaiswal]

Yeah they are
I'll try this, thanks