currentFraction.kt

@OptIn(ExperimentalMaterialApi::class)
val BottomSheetScaffoldState.currentFraction: Float
    get() {
        val fraction = bottomSheetState.progress.fraction
        val targetValue = bottomSheetState.targetValue
        val currentValue = bottomSheetState.currentValue

        return when {
            currentValue == Collapsed && targetValue == Collapsed -> 0f
            currentValue == Expanded && targetValue == Expanded -> 1f
            currentValue == Collapsed && targetValue == Expanded -> fraction
            else -> 1f - fraction
        }
    }