pullRefreshIndicatorTransform

PullRefreshIndicatorTransformSample

/**
 * An example to show how [pullRefreshIndicatorTransform] can be given custom contents to create a
 * custom indicator.
 */
@Composable
@OptIn(ExperimentalMaterialApi::class)
fun PullRefreshIndicatorTransformSample() {
    val refreshScope = rememberCoroutineScope()
    var refreshing by remember { mutableStateOf(false) }
    var itemCount by remember { mutableStateOf(15) }
    fun refresh() =
        refreshScope.launch {
            refreshing = true
            delay(1500)
            itemCount += 5
            refreshing = false
        }
    val state = rememberPullRefreshState(refreshing, ::refresh)
    val rotation = animateFloatAsState(state.progress * 120)
    Box(Modifier.fillMaxSize().pullRefresh(state)) {
        LazyColumn {
            if (!refreshing) {
                items(itemCount) { ListItem { Text(text = "Item ${itemCount - it}") } }
            }
        }
        Surface(
            modifier =
                Modifier.size(40.dp)
                    .align(Alignment.TopCenter)
                    .pullRefreshIndicatorTransform(state)
                    .rotate(rotation.value),
            shape = RoundedCornerShape(10.dp),
            color = Color.DarkGray,
            elevation = if (state.progress > 0 || refreshing) 20.dp else 0.dp,
        ) {
            Box {
                if (refreshing) {
                    CircularProgressIndicator(
                        modifier = Modifier.align(Alignment.Center).size(25.dp),
                        color = Color.White,
                        strokeWidth = 3.dp,
                    )
                }
            }
        }
    }
}