Snap to an index Lazyrow

Question

I am making a calendar with the help of a lazyRow. I now have the problem that I want the row to snap to the index after a certain scroll amount so it shouldn't be possible to be stuck in between indexes. Is there a way to do that?

    LazyRow(state = calendarViewModel.listState, modifier = Modifier.fillMaxWidth()) {
        calendarYears.forEach {
            items(it.months.count()) { index ->
                calendarViewModel.onEvent(CalendarEvent.ClickedMenuItem(index))
                CalendarRowItem(
                    modifier = Modifier.fillParentMaxWidth(),
                    calendarSize = it.months[index].amountOfDays,
                    initWeekday = it.months[index].startDayOfMonth.ordinal,
                    textColor = MaterialTheme.colors.secondaryVariant,
                    clickedColor = MaterialTheme.colors.primary,
                    textStyle = MaterialTheme.typography.body1
                )
            }
        }
    }

user_1094333 · Answer

You can use the HorizontalPager from accompanist library which provides this fling behavior out-of-the-box and it uses LazyRow internally.

Another option could be use the Snapper library created by @chris-banes

Add the dependency in your build.gradle.

dependencies {
    implementation "dev.chrisbanes.snapper:snapper:"
}

and use it in your LazyRow.

val lazyListState = rememberLazyListState()

LazyRow(
    state = lazyListState,
    flingBehavior = rememberSnapperFlingBehavior(lazyListState),
) {
    // content
}

Result:

Snap to an index Lazyrow

1 Answers