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fix: let the chats align to the top

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Freek van de Ven 2025-02-18 22:27:43 +01:00 committed by Bart Ribbers
parent dd70e7344e
commit 100683f554
1 changed files with 50 additions and 20 deletions
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70
packages/flutter_chat/lib/src/screens/chat_detail/chat_detail_screen.dart
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@ -249,6 +249,7 @@ class _ChatBody extends HookWidget {
var isLoadingOlder = useState(false);
var isLoadingNewer = useState(false);
var autoScrollEnabled = useState(true);
var messagesStream = useMemoized(
() => service.getMessages(chatId: chatId),
@ -320,14 +321,21 @@ class _ChatBody extends HookWidget {
var offset = scrollController.offset;
var maxScroll = scrollController.position.maxScrollExtent;
var threshold = options.paginationControls.scrollOffset;
if ((maxScroll - offset) <= options.paginationControls.scrollOffset &&
!isLoadingOlder.value) {
var distanceFromBottom = maxScroll - offset;
if (distanceFromBottom > 50) {
autoScrollEnabled.value = false;
} else {
autoScrollEnabled.value = true;
}
if (offset <= threshold && !isLoadingOlder.value) {
unawaited(loadOlderMessages());
}
if (offset <= options.paginationControls.scrollOffset &&
!isLoadingNewer.value) {
if (distanceFromBottom <= threshold && !isLoadingNewer.value) {
unawaited(loadNewerMessages());
}
}
@ -341,6 +349,34 @@ class _ChatBody extends HookWidget {
chat,
]);
useEffect(
() {
var disposed = false;
/// Continuously scroll to the bottom of the chat
Future<void> scrollLoop() async {
while (!disposed && autoScrollEnabled.value) {
await Future.delayed(const Duration(milliseconds: 500));
if (disposed || !autoScrollEnabled.value) break;
WidgetsBinding.instance.addPostFrameCallback((_) {
if (disposed || !autoScrollEnabled.value) return;
if (scrollController.hasClients) {
scrollController.jumpTo(
scrollController.position.maxScrollExtent,
);
}
});
}
}
unawaited(scrollLoop());
return () => disposed = true;
},
[autoScrollEnabled.value],
);
if (chat == null) {
if (!options.enableLoadingIndicator) return const SizedBox.shrink();
return options.builders.loadingWidgetBuilder.call(context);
@ -361,17 +397,13 @@ class _ChatBody extends HookWidget {
? options.builders.loadingChatMessageBuilder.call(context)
: const SizedBox.shrink();
var reversedMessages = messages.reversed.toList();
var bubbleChildren = <Widget>[];
if (reversedMessages.isEmpty) {
if (messages.isEmpty) {
bubbleChildren
.add(ChatNoMessages(isGroupChat: chat?.isGroupChat ?? false));
} else {
for (var (index, msg) in reversedMessages.indexed) {
var nextIndex = index + 1;
var prevMsg = nextIndex < reversedMessages.length
? reversedMessages[nextIndex]
: null;
for (var (index, msg) in messages.indexed) {
var prevMsg = index > 0 ? messages[index - 1] : null;
bubbleChildren.add(
ChatBubble(
@ -393,15 +425,13 @@ class _ChatBody extends HookWidget {
return Column(
children: [
Expanded(
child: Align(
alignment: options.chatAlignment ?? Alignment.bottomCenter,
child: ListView(
reverse: true,
controller: scrollController,
physics: const AlwaysScrollableScrollPhysics(),
padding: const EdgeInsets.only(top: 24),
children: listViewChildren,
),
child: ListView.builder(
reverse: false,
controller: scrollController,
physics: const AlwaysScrollableScrollPhysics(),
padding: const EdgeInsets.only(top: 24),
itemCount: listViewChildren.length,
itemBuilder: (context, index) => listViewChildren[index],
),
),
ChatBottomInputSection(