RepeatingButton_Step6.kt

@Composable
fun RepeatingButton(
    modifier: Modifier = Modifier,
    onClick: () -> Unit,
    enabled: Boolean = true,
    interactionSource: MutableInteractionSource = remember { MutableInteractionSource() },
    elevation: ButtonElevation? = ButtonDefaults.elevation(),
    shape: Shape = MaterialTheme.shapes.small,
    border: BorderStroke? = null,
    colors: ButtonColors = ButtonDefaults.buttonColors(),
    contentPadding: PaddingValues = ButtonDefaults.ContentPadding,
    maxDelayMillis: Long = 1000,
    minDelayMillis: Long = 5,
    delayDecayFactor: Float = .20f,
    content: @Composable RowScope.() -> Unit
) {
    Button(
        modifier = modifier.repeatingClickable(
            interactionSource = interactionSource,
            enabled = enabled,
            maxDelayMillis = maxDelayMillis,
            minDelayMillis = minDelayMillis,
            decayFactor = delayDecayFactor
        ) { onClick() },
        onClick = {},
        enabled = enabled,
        interactionSource = interactionSource,
        elevation = elevation,
        shape = shape,
        border = border,
        colors = colors,
        contentPadding = contentPadding,
        content = content
    )
}

fun Modifier.repeatingClickable(
    interactionSource: InteractionSource,
    enabled: Boolean,
    maxDelayMillis: Long = 1000,
    minDelayMillis: Long = 5,
    delayDecayFactor: Float = .20f,
    onClick: () -> Unit
): Modifier = composed {

    val currentClickListener by rememberUpdatedState(onClick)

    pointerInput(interactionSource, enabled) {
        forEachGesture {
            coroutineScope {
                awaitPointerEventScope {
                    val down = awaitFirstDown(requireUnconsumed = false)
                    val heldButtonJob = launch {
                        var currentDelayMillis = maxDelayMillis
                        while (enabled && down.pressed) {
                            currentClickListener()
                            delay(currentDelayMillis)
                            val nextMillis = currentDelayMillis - (currentDelayMillis * delayDecayFactor)
                            currentDelayMillis = nextMillis.toLong().coerceAtLeast(minDelayMillis)
                        }
                    }
                    waitForUpOrCancellation()
                    heldButtonJob.cancel()
                }
            }
        }
    }
}