rememberScrollIndicatorState

@Composable

fun rememberScrollIndicatorState(orientation: Orientation, state: ScrollState): ScrollIndicatorState

Create a ScrollIndicatorState for ScrollState.

orientation

The orientation of the scroll indicator. Orientation.Vertical for Column and Orientation.Horizontal for Row.

state

The ScrollState that applied to Modifier.verticalScroll or Modifier.horizontalScroll of Column or Row.

@Composable

Create a ScrollIndicatorState for LazyListState.

state

The LazyListState that applied to LazyColumn or LazyRow.

@Composable

Create a ScrollIndicatorState for LazyGridState.

Estimation strategy:

Compute per-line max main-axis item size and average it as the "average line height/width".
Total lines ≈ ceil(totalItemsCount / maxSpan).
scrolledPx ≈ average line main-axis size × current line index + firstVisibleItemScrollOffset.
totalScrollableDistancePx ≈ average line main-axis size × total lines − viewport length.

@Composable

Create a ScrollIndicatorState for LazyStaggeredGridState.

Estimation strategy:

Infer maximum lane count spanMax from visible items' lane.
scrolledPx ≈ average item main-axis size × current line index + firstVisibleItemScrollOffset. Current line index is approximated by firstVisibleItemIndex / spanMax.
totalScrollableDistancePx ≈ average item main-axis size × total items / spanMax − viewport length.