millis

millis

@Composable
fun DrawSomething(
    modifier: Modifier,
    strokeWidth: Float = 8f
) {
    val millis = animationTimeMillis()

// A: when adding a Log here, millis.value will stop at 0 and won't draw arc
// Log.d("DrawSomething", "millis : ${millis.value}")

    Canvas(modifier = modifier) {

        // B
        // Log.d("DrawSomething", "millis : ${millis.value}")

        drawArc(
            color = Color.Green,
            startAngle = 0f,
            sweepAngle = 0f + (millis.value / 360),
            useCenter = false,
            size = Size(100f, 100f),
            style = Stroke(width = strokeWidth)
        )
    }
}
@Composable
fun animationTimeMillis(): State<Long> {
    val millisState = mutableStateOf(0L)
    val lifecycleOwner = AmbientLifecycleOwner.current
    LaunchedEffect(Unit) {
        val startTime = withFrameMillis { it }
        lifecycleOwner.whenStarted {
            while (true) {
                withFrameMillis { frameTime ->
                    millisState.value = frameTime - startTime
                }
            }
        }
    }
    return millisState
}

val millisState = mutableStateOf(0L)

val millisState = remember { mutableStateOf(0L) }