Effector - Kotlin - TodoList

domain.kt

val addClicked = Event.create<Unit>()
val textChanged = Event.create<String>()
val itemDeleted = Event.create<Int>()

private val itemAdded = Event.create<String>()

val storeText = Store.create("")
    .on(textChanged) { _, newText -> newText }
    .reset(itemAdded)

val storeAddEnabled = storeText.map { it.isNotEmpty() }

val storeItems = Store.create(emptyList<String>())
    .on(itemAdded) { items, newItem -> items + newItem }
    .on(itemDeleted) { items, position -> items.filterIndexed { i, _ -> i != position } }

fun main() {
    sample(
        clock = addClicked,
        source = storeText,
        target = itemAdded,
    )
}

screen.kt

@Composable
fun TodoList() {
    Column(
        modifier = Modifier
            .padding(horizontal = 8.dp)
            .fillMaxWidth(),
        verticalArrangement = Arrangement.spacedBy(4.dp),
        horizontalAlignment = Alignment.End,
    ) {
        TextField(
            modifier = Modifier.fillMaxWidth(),
            value = storeText.get(),
            onValueChange = { textChanged(it) }
        )
        Button(
            enabled = storeAddEnabled.get(),
            onClick = { addClicked(Unit) }) {
            Text(text = "Add")
        }
        Column(modifier = Modifier.fillMaxWidth()) {
            for ((i, item) in storeItems.get().withIndex()) {
                Row {
                    Text(
                        modifier = Modifier
                            .weight(1f)
                            .padding(vertical = 8.dp),
                        text = item
                    )
                    Button(onClick = { itemDeleted(i) }) { Text(text = "Delete") }
                }
            }
        }
    }
}