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android: Chat auto-scrolling behaviour (#1556)

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Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>
This commit is contained in:
Stanislav Dmitrenko
2022-12-12 18:34:26 +03:00
committed by GitHub
parent d6e9a87d58
commit 1246b9e376
1 changed files with 7 additions and 3 deletions
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apps/android/app/src/main/java/chat/simplex/app/views/chat/ChatView.kt
+7 -3
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@@ -617,17 +617,21 @@ private fun ScrollToBottom(chatId: ChatId, listState: LazyListState, chatItems:
// Don't autoscroll next time until it will be needed
shouldAutoScroll = false to chatId
}
val scrollDistance = with(LocalDensity.current) { -39.dp.toPx() }
/*
* Since we use key with each item in LazyColumn, LazyColumn will not autoscroll to bottom item. We need to do it ourselves.
* When the first visible item (from bottom) is fully visible we can autoscroll to 0 item
* When the first visible item (from bottom) is visible (even partially) we can autoscroll to 0 item. Or just scrollBy small distance otherwise
* */
LaunchedEffect(Unit) {
snapshotFlow { chatItems.lastOrNull()?.id }
.distinctUntilChanged()
.filter { listState.firstVisibleItemIndex == 0 && listState.firstVisibleItemScrollOffset == 0 }
.filter { listState.layoutInfo.visibleItemsInfo.firstOrNull()?.key != it }
.collect {
listState.animateScrollToItem(0)
if (listState.firstVisibleItemIndex == 0) {
listState.animateScrollToItem(0)
} else {
listState.animateScrollBy(scrollDistance)
}
}
}
}