DatePickerDialog

DatePickerDialogSample

@Preview
@Composable
fun DatePickerDialogSample() {
    // Decoupled snackbar host state from scaffold state for demo purposes.
    val snackState = remember { SnackbarHostState() }
    val snackScope = rememberCoroutineScope()
    SnackbarHost(hostState = snackState, Modifier)
    val openDialog = remember { mutableStateOf(true) }
    // TODO demo how to read the selected date from the state.
    if (openDialog.value) {
        val datePickerState = rememberDatePickerState()
        val confirmEnabled = remember {
            derivedStateOf { datePickerState.selectedDateMillis != null }
        }
        DatePickerDialog(
            onDismissRequest = {
                // Dismiss the dialog when the user clicks outside the dialog or on the back
                // button. If you want to disable that functionality, simply use an empty
                // onDismissRequest.
                openDialog.value = false
            },
            confirmButton = {
                TextButton(
                    onClick = {
                        openDialog.value = false
                        snackScope.launch {
                            snackState.showSnackbar(
                                "Selected date timestamp: ${datePickerState.selectedDateMillis}"
                            )
                        }
                    },
                    enabled = confirmEnabled.value,
                ) {
                    Text("OK")
                }
            },
            dismissButton = {
                TextButton(onClick = { openDialog.value = false }) { Text("Cancel") }
            },
        ) {
            // The verticalScroll will allow scrolling to show the entire month in case there is not
            // enough horizontal space (for example, when in landscape mode).
            // Note that it's still currently recommended to use a DisplayMode.Input at the state in
            // those cases.
            DatePicker(
                state = datePickerState,
                modifier = Modifier.verticalScroll(rememberScrollState()),
            )
        }
    }
}