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android: Fix autoscroll to bottom when going from group to direct (#1209)

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* android: Fix autoscroll to bottom when going from group to direct
- and makes scrolling smoother because of -1 number of recompose

* Rename
This commit is contained in:
Stanislav Dmitrenko
2022-10-16 14:41:01 +03:00
committed by GitHub
parent 63f40f030a
commit 656c10976b
1 changed files with 16 additions and 11 deletions
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27
apps/android/app/src/main/java/chat/simplex/app/views/chat/ChatView.kt
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@@ -48,7 +48,6 @@ import kotlinx.coroutines.flow.*
import kotlinx.datetime.Clock
import java.io.File
import kotlin.math.sign
import kotlin.math.roundToInt
@Composable
fun ChatView(chatModel: ChatModel) {
@@ -447,16 +446,7 @@ fun BoxWithConstraintsScope.ChatItemsList(
val scope = rememberCoroutineScope()
val uriHandler = LocalUriHandler.current
val cxt = LocalContext.current
// Helps to scroll to bottom after moving from Group to Direct chat
// and prevents scrolling to bottom on orientation change
var shouldAutoScroll by rememberSaveable { mutableStateOf(true) }
LaunchedEffect(chat.chatInfo.apiId, chat.chatInfo.chatType, shouldAutoScroll) {
if (shouldAutoScroll && listState.firstVisibleItemIndex != 0) {
scope.launch { listState.scrollToItem(0) }
}
// Don't autoscroll next time until it will be needed
shouldAutoScroll = false
}
ScrollToBottom(chat.id, listState)
var prevSearchEmptiness by rememberSaveable { mutableStateOf(searchValue.value.isEmpty()) }
// Scroll to bottom when search value changes from something to nothing and back
LaunchedEffect(searchValue.value.isEmpty()) {
@@ -578,6 +568,21 @@ fun BoxWithConstraintsScope.ChatItemsList(
FloatingButtons(chatItems, unreadCount, chat.chatStats.minUnreadItemId, searchValue, markRead, setFloatingButton, listState)
}
@Composable
private fun ScrollToBottom(chatId: ChatId, listState: LazyListState) {
val scope = rememberCoroutineScope()
// Helps to scroll to bottom after moving from Group to Direct chat
// and prevents scrolling to bottom on orientation change
var shouldAutoScroll by rememberSaveable { mutableStateOf(true to chatId) }
LaunchedEffect(chatId, shouldAutoScroll) {
if ((shouldAutoScroll.first || shouldAutoScroll.second != chatId) && listState.firstVisibleItemIndex != 0) {
scope.launch { listState.scrollToItem(0) }
}
// Don't autoscroll next time until it will be needed
shouldAutoScroll = false to chatId
}
}
@Composable
fun BoxWithConstraintsScope.FloatingButtons(
chatItems: List<ChatItem>,