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Merge the read receipts code with TimelineScrollHelper (#736)

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Jorge Martin Espinosa 2023-06-30 20:54:29 +02:00 • committed by GitHub
parent 5f7f770332
commit a52f35db01
1 changed files with 21 additions and 8 deletions
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25
features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelineView.kt
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@ -77,6 +77,10 @@ fun TimelineView(
state.eventSink(TimelineEvents.LoadMore) state.eventSink(TimelineEvents.LoadMore)
} }
fun onScrollFinishedAt(firstVisibleIndex: Int) {
state.eventSink(TimelineEvents.OnScrollFinished(firstVisibleIndex))
}
val lazyListState = rememberLazyListState() val lazyListState = rememberLazyListState()
fun inReplyToClicked(eventId: EventId) { fun inReplyToClicked(eventId: EventId) {
@ -121,7 +125,8 @@ fun TimelineView(
TimelineScrollHelper( TimelineScrollHelper(
lazyListState = lazyListState, lazyListState = lazyListState,
timelineItems = state.timelineItems timelineItems = state.timelineItems,
onScrollFinishedAt = ::onScrollFinishedAt,
) )
} }
} }
@ -219,21 +224,29 @@ fun TimelineItemRow(
internal fun BoxScope.TimelineScrollHelper( internal fun BoxScope.TimelineScrollHelper(
lazyListState: LazyListState, lazyListState: LazyListState,
timelineItems: ImmutableList<TimelineItem>, timelineItems: ImmutableList<TimelineItem>,
onScrollFinishedAt: (Int) -> Unit = {},
) { ) {
val coroutineScope = rememberCoroutineScope() val coroutineScope = rememberCoroutineScope()
val firstVisibleItemIndex by remember { derivedStateOf { lazyListState.firstVisibleItemIndex } } val firstVisibleItemIndex by remember { derivedStateOf { lazyListState.firstVisibleItemIndex } }
val isScrollFinished by remember { derivedStateOf { !lazyListState.isScrollInProgress } }
val shouldAutoScrollToBottom by remember { derivedStateOf { lazyListState.firstVisibleItemIndex < 2 } }
LaunchedEffect(timelineItems, firstVisibleItemIndex, isScrollFinished) {
if (!isScrollFinished) return@LaunchedEffect
// Notify the parent composable about the first visible item index when scrolling finishes
onScrollFinishedAt(firstVisibleItemIndex)
// Auto-scroll when new timeline items appear // Auto-scroll when new timeline items appear
LaunchedEffect(timelineItems, firstVisibleItemIndex) { if (shouldAutoScrollToBottom) {
if (!lazyListState.isScrollInProgress && coroutineScope.launch {
firstVisibleItemIndex < 2
) coroutineScope.launch {
lazyListState.animateScrollToItem(0) lazyListState.animateScrollToItem(0)
} }
} }
}
// Jump to bottom button // Jump to bottom button
if (firstVisibleItemIndex > 2) { if (!shouldAutoScrollToBottom) {
FloatingActionButton( FloatingActionButton(
onClick = { onClick = {
coroutineScope.launch { coroutineScope.launch {