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Add timeline prefetching

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This should trigger when getting close the start of the loaded timeline, making scrolling back smoother, specially when combined with the persistent event cache.
This commit is contained in:
Jorge Martín
2025-03-12 16:19:36 +01:00
parent 70c8524e20
commit 98bb5720d1
2 changed files with 15 additions and 0 deletions
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13
features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelineView.kt
View File

@@ -70,8 +70,10 @@ import io.element.android.libraries.designsystem.theme.components.Icon
import io.element.android.libraries.designsystem.utils.animateScrollToItemCenter
import io.element.android.libraries.matrix.api.core.EventId
import io.element.android.libraries.matrix.api.core.UserId
import io.element.android.libraries.matrix.api.timeline.Timeline
import io.element.android.libraries.ui.strings.CommonStrings
import kotlinx.coroutines.launch
import timber.log.Timber
@Composable
fun TimelineView(
@@ -175,6 +177,17 @@ fun TimelineView(
onClearFocusRequestState = ::clearFocusRequestState
)
val isCloseToStartOfLoadedTimeline by remember { derivedStateOf {
lazyListState.firstVisibleItemIndex + lazyListState.layoutInfo.visibleItemsInfo.size >= lazyListState.layoutInfo.totalItemsCount - 10
} }
LaunchedEffect(isCloseToStartOfLoadedTimeline) {
// Only back paginate when we're close to the start of the loaded timeline items and the user is actively scrolling
if (lazyListState.isScrollInProgress && isCloseToStartOfLoadedTimeline) {
Timber.d("Prefetching pagination with ${lazyListState.layoutInfo.totalItemsCount} items")
state.eventSink(TimelineEvents.LoadMore(Timeline.PaginationDirection.BACKWARDS))
}
}
TimelineScrollHelper(
hasAnyEvent = state.hasAnyEvent,
lazyListState = lazyListState,

2
features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/TimelineItemVirtualRow.kt
View File

@@ -28,6 +28,7 @@ import io.element.android.features.messages.impl.timeline.model.virtual.Timeline
import io.element.android.features.messages.impl.timeline.model.virtual.TimelineItemRoomBeginningModel
import io.element.android.features.messages.impl.timeline.model.virtual.TimelineItemTypingNotificationModel
import io.element.android.features.messages.impl.typing.TypingNotificationView
import timber.log.Timber
@Composable
fun TimelineItemVirtualRow(
@@ -45,6 +46,7 @@ fun TimelineItemVirtualRow(
TimelineLoadingMoreIndicator(virtual.model.direction)
val latestEventSink by rememberUpdatedState(eventSink)
LaunchedEffect(virtual.model.timestamp) {
Timber.d("Pagination triggered by load more indicator")
latestEventSink(TimelineEvents.LoadMore(virtual.model.direction))
}
}