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Timeline: handle loadMore pre-loading

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ganfra 2022-11-24 11:59:44 +01:00
parent 42982d2238
commit 8d87578890
1 changed files with 28 additions and 6 deletions
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34
features/messages/src/main/java/io/element/android/x/features/messages/MessagesScreen.kt
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@ -39,6 +39,7 @@ import io.element.android.x.features.messages.model.content.*
import io.element.android.x.features.messages.textcomposer.MessageComposerViewModel import io.element.android.x.features.messages.textcomposer.MessageComposerViewModel
import io.element.android.x.features.messages.textcomposer.MessageComposerViewState import io.element.android.x.features.messages.textcomposer.MessageComposerViewState
import io.element.android.x.textcomposer.TextComposer import io.element.android.x.textcomposer.TextComposer
import kotlinx.coroutines.flow.distinctUntilChanged
import kotlinx.coroutines.launch import kotlinx.coroutines.launch
import timber.log.Timber import timber.log.Timber
@ -279,11 +280,15 @@ fun TimelineItems(
} }
if (hasMoreToLoad) { if (hasMoreToLoad) {
item { item {
MessagesLoadingMoreIndicator(onReachedLoadMore) MessagesLoadingMoreIndicator()
} }
} }
} }
MessagesScrollHelper(lazyListState = lazyListState, timelineItems = timelineItems) MessagesScrollHelper(
lazyListState = lazyListState,
timelineItems = timelineItems,
onLoadMore = onReachedLoadMore
)
} }
} }
@ -420,10 +425,12 @@ private fun MessageSenderInformation(
) )
} }
} }
@Composable @Composable
internal fun BoxScope.MessagesScrollHelper( internal fun BoxScope.MessagesScrollHelper(
lazyListState: LazyListState, lazyListState: LazyListState,
timelineItems: List<MessagesTimelineItemState>, timelineItems: List<MessagesTimelineItemState>,
onLoadMore: () -> Unit,
) { ) {
val coroutineScope = rememberCoroutineScope() val coroutineScope = rememberCoroutineScope()
val firstVisibleItemIndex by remember { derivedStateOf { lazyListState.firstVisibleItemIndex } } val firstVisibleItemIndex by remember { derivedStateOf { lazyListState.firstVisibleItemIndex } }
@ -437,6 +444,24 @@ internal fun BoxScope.MessagesScrollHelper(
} }
} }
// Handle load more preloading
val loadMore by remember {
derivedStateOf {
val layoutInfo = lazyListState.layoutInfo
val totalItemsNumber = layoutInfo.totalItemsCount
val lastVisibleItemIndex = (layoutInfo.visibleItemsInfo.lastOrNull()?.index ?: 0) + 1
lastVisibleItemIndex > (totalItemsNumber - 30)
}
}
LaunchedEffect(loadMore) {
snapshotFlow { loadMore }
.distinctUntilChanged()
.collect {
onLoadMore()
}
}
// Jump to bottom button // Jump to bottom button
if (firstVisibleItemIndex > 2) { if (firstVisibleItemIndex > 2) {
FloatingActionButton( FloatingActionButton(
@ -463,7 +488,7 @@ internal fun BoxScope.MessagesScrollHelper(
} }
@Composable @Composable
internal fun MessagesLoadingMoreIndicator(onReachedLoadMore: () -> Unit) { internal fun MessagesLoadingMoreIndicator() {
Box( Box(
Modifier Modifier
.fillMaxWidth() .fillMaxWidth()
@ -475,9 +500,6 @@ internal fun MessagesLoadingMoreIndicator(onReachedLoadMore: () -> Unit) {
strokeWidth = 2.dp, strokeWidth = 2.dp,
color = MaterialTheme.colorScheme.primary color = MaterialTheme.colorScheme.primary
) )
LaunchedEffect(Unit) {
onReachedLoadMore()
}
} }
} }