Picker

PickerGroupSample

@Composable
fun PickerGroupSample() {
    var selectedPickerIndex by remember { mutableIntStateOf(0) }
    val pickerStateHour = rememberPickerState(initialNumberOfOptions = 24)
    val pickerStateMinute = rememberPickerState(initialNumberOfOptions = 60)
    Column(
        modifier = Modifier.fillMaxWidth(),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        Spacer(modifier = Modifier.size(30.dp))
        val label = if (selectedPickerIndex == 0) "Hours" else "Minutes"
        AnimatedContent(targetState = label) { targetText -> Text(text = targetText) }
        Spacer(modifier = Modifier.size(10.dp))
        PickerGroup(
            selectedPickerState =
                if (selectedPickerIndex == 0) pickerStateHour else pickerStateMinute,
            autoCenter = false,
        ) {
            PickerGroupItem(
                pickerState = pickerStateHour,
                selected = selectedPickerIndex == 0,
                onSelected = { selectedPickerIndex = 0 },
                option = { optionIndex, _ -> Text(text = "%02d".format(optionIndex)) },
                contentDescription = { "Hours" },
                modifier = Modifier.size(80.dp, 100.dp),
            )
            PickerGroupItem(
                pickerState = pickerStateMinute,
                selected = selectedPickerIndex == 1,
                onSelected = { selectedPickerIndex = 1 },
                option = { optionIndex, _ -> Text(text = "%02d".format(optionIndex)) },
                contentDescription = { "Minutes" },
                modifier = Modifier.size(80.dp, 100.dp),
            )
        }
    }
}

SimplePicker

@Composable
fun SimplePicker() {
    val items = listOf("One", "Two", "Three", "Four", "Five")
    val state = rememberPickerState(items.size)
    // We forward scroll gestures from the whole screen to the Picker which makes this sample
    // accessible for 2-finger vertical scrolling.
    Box(
        modifier =
            Modifier.fillMaxSize()
                .scrollable(
                    state = state,
                    orientation = Orientation.Vertical,
                    reverseDirection = true,
                ),
        contentAlignment = Alignment.Center,
    ) {
        Text(
            modifier = Modifier.align(Alignment.TopCenter).padding(top = 10.dp),
            text = "Selected: ${items[state.selectedOptionIndex]}",
        )
        Picker(
            modifier = Modifier.size(100.dp, 100.dp),
            state = state,
            contentDescription = { "${state.selectedOptionIndex + 1}" },
        ) {
            Text(items[it])
        }
    }
}