Hi there. I am getting a wrong progress from `BottomSheetState` when used in `BottomSheetScaffold` a...

# compose

[Simon Stahl]

Hi there. I am getting a wrong progress from BottomSheetState when used in BottomSheetScaffold and decreasing the sheetPeekHeight. Example code in comment

[Simon Stahl]

I have a BottomSheetScaffold where I set the peek height with a slider. I noticed that when the peek height decreases, the BottomSheetState.progress has wrong values

[Simon Stahl]

fun Greeting() {
    var sliderValue by remember { mutableStateOf(0f) }
    val bottomSheetState = rememberBottomSheetScaffoldState()

    val sheetPeekHeight = 70.dp * (1 - sliderValue)

    bottomSheetState.bottomSheetState.progress.let {
        Log.e("Simon", "from: ${it.from} to: ${<http://it.to|it.to>} val: ${it.fraction}")
    }


    BottomSheetScaffold(
        sheetContent = {
            Text(
                modifier = Modifier.height(300.dp).padding(10.dp),
                text = "Sheet content"
            )
        },
        scaffoldState = bottomSheetState,
        sheetPeekHeight = sheetPeekHeight,
        sheetShape = RoundedCornerShape(
            topStart = 20.dp,
            topEnd = 20.dp
        ),
        sheetBackgroundColor = Color.LightGray
    ) {
        Slider(value = sliderValue, onValueChange = { sliderValue = it })
    }
}

[Simon Stahl]

when I move the slider to the right, to decrease the peek height, I get log outputs like this one

from: Collapsed to: Expanded val: 0.0010182378

even though from and to should be the same at this point and the fraction should be 0f

[Simon Stahl]

I assumed a rounding issue, but it looks like there might be a race condition or timing issue of when offset and fraction are changed

[Simon Stahl]

I think Swipeable.findBounds() is being called at a moment when anchors and offest are out of sync?

[Simon Stahl]

Question is if I am doing something wrong on my side or if this is a bug?

[jossiwolf]

Swipeable has some synchronization issues so this sounds like it could be a bug. CC @matvei

[Colton Idle]

I think I filed a bug about progress and bottom sheets being wrong in accompanist. on mobile right now but if you search my name on accompanist issue tracker you can see if its the same.

[Simon Stahl]

@Colton Idle in accompanist? Not sure how this is related. This issue seems to be in SwipeProgress in compose itself.

[Simon Stahl]

anyhow, i did look up your name in the accompanist issues and didn't find you. maybe i'm looking at the wrong place? https://github.com/google/accompanist/issues

[Colton Idle]

https://github.com/google/accompanist/issues/created_by/ColtonIdle

[Simon Stahl]

Thanks. Looks like the author autocomplete does not work with your name 🙂

[Simon Stahl]

I don't think any of your issues are the same as what i am experiencing. I think i'll go ahead and file a compose bug for it

[Simon Stahl]

for reference: https://issuetracker.google.com/issues/221094909

[Colton Idle]

Sorry!

[Simon Stahl]

no worries 🙂

[jossiwolf]

Thanks for filing🙏