EditExpenseContent.kt

@Composable
internal fun EditExpenseContent(
    state: EditState,
    onEditExpense: ((Expense) -> Unit)? = null,
    onPayerClicked: ((Payer) -> Unit)? = null,
    onAddNewPayerClicked: (() -> Unit)? = null,
    onReceiverCheckedChange: ((Receiver) -> Unit)? = null,
    onAddNewReceiverClick: (() -> Unit)? = null,
) {
    var title by rememberSaveable { mutableStateOf(state.expense?.title.orEmpty()) }
    val pagerState = rememberPagerState()
    val coroutineScope = rememberCoroutineScope()

    val onBack: () -> Unit = {
        state.expense?.let { onEditExpense?.invoke(it.copy(title = title)) }
    }

    BackHandler(onBack = onBack)
    
    // ...
}