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Code Issues 30 Pull requests Releases Activity

tweak scroll behavior

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This commit is contained in:
Henry Hiles 2026-09-26 14:52:24 -04:00
commit d712bb3193
Signed by: Henry-Hiles
SSH key fingerprint: SHA256:VKQUdS31Q90KvX7EkKMHMBpUspcmItAh86a+v7PGiIs
2 changed files with 53 additions and 57 deletions
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104
lib/helpers/hooks/chat_scroll.dart
View file

@ -12,11 +12,11 @@ final class ChatScroll({
required final IList<Event> historyItems,
required final IList<Event> liveItems,
required final GlobalKey centerKey,
required final GlobalKey anchorItemKey,
required final ScrollController scrollController,
required final bool atBottom,
required final Future<void> Function(String id) jumpToId,
required final Future<void> Function() jumpToBottom,
required final GlobalKey Function(String eventId) keyFor,
}) {
factory use({
required AsyncValue<RoomChat?> controllerData,
@ -26,7 +26,9 @@ final class ChatScroll({
}) {
final anchorId = useState<String?>(null);
final anchorItemKey = useMemoized(GlobalKey.new, [anchorId.value]);
final itemKeys = useMemoized(() => <String, GlobalKey>{}, []);
GlobalKey keyFor(String eventId) =>
itemKeys.putIfAbsent(eventId, GlobalKey.new);
final scrollController = useScrollController();
final centerKey = useMemoized(GlobalKey.new);
@ -83,7 +85,7 @@ final class ChatScroll({
if (completer == null) return null;
WidgetsBinding.instance.addPostFrameCallback((_) {
final context = anchorItemKey.currentContext;
final context = keyFor(anchorId.value!).currentContext;
if (context != null && context.mounted) {
anchorMountedCompleter.value?.complete(context);
anchorMountedCompleter.value = null;
@ -151,62 +153,58 @@ final class ChatScroll({
],
);
Future<void> jumpToId(String itemId) async {
if (!scrollController.hasClients) return;
if (anchorId.value != itemId) {
final completer = Completer<BuildContext>();
anchorMountedCompleter.value = completer;
pendingAnchorTarget.value = itemId;
contextualEvent.value = itemId;
final context = await completer.future;
if (!context.mounted) return;
await Scrollable.ensureVisible(
context,
alignment: 0.5,
duration: const .new(milliseconds: 700),
curve: Curves.easeInOut,
);
return;
}
final context = anchorItemKey.currentContext;
if (context != null && context.mounted) {
await Scrollable.ensureVisible(
context,
alignment: 0.5,
duration: const .new(milliseconds: 700),
curve: Curves.easeInOut,
);
}
}
Future<void> jumpToBottom() async {
if (contextualEvent.value != null) {
anchorId.value = null;
contextualEvent.value = null;
}
if (!scrollController.hasClients) return;
await scrollController.animateTo(
scrollController.position.minScrollExtent,
duration: const .new(milliseconds: 700),
curve: Curves.easeInOut,
);
}
return .new(
historyItems: split.history,
liveItems: split.live,
centerKey: centerKey,
anchorItemKey: anchorItemKey,
scrollController: scrollController,
atBottom: atBottom.value,
jumpToId: jumpToId,
jumpToBottom: jumpToBottom,
jumpToId: (String itemId) async {
if (!scrollController.hasClients) return;
final existing = keyFor(itemId).currentContext;
if (existing != null && existing.mounted) {
// Already mounted, just scroll
await Scrollable.ensureVisible(
existing,
alignment: 0.5,
duration: const .new(milliseconds: 700),
curve: Curves.easeInOut,
);
} else {
final completer = Completer<BuildContext>();
anchorMountedCompleter.value = completer;
pendingAnchorTarget.value = itemId;
contextualEvent.value = itemId;
final context = await completer.future;
if (!context.mounted) return;
await Scrollable.ensureVisible(context, alignment: 10);
if (!context.mounted) return;
await Scrollable.ensureVisible(
context,
alignment: 0.5,
duration: const .new(milliseconds: 700),
curve: Curves.easeOutCirc,
);
}
},
jumpToBottom: () async {
if (contextualEvent.value != null) {
anchorId.value = null;
contextualEvent.value = null;
}
if (!scrollController.hasClients) return;
await scrollController.animateTo(
scrollController.position.minScrollExtent,
duration: const .new(milliseconds: 700),
curve: Curves.easeInOut,
);
},
keyFor: keyFor,
);
}
}

6
lib/widgets/room_chat/chat_timeline.dart
View file

@ -59,9 +59,7 @@ class const ChatTimeline({
jumpToId: jumpToId,
getEventOptions: getEventOptions,
highlightedEvent: highlightedEvent,
key: index == 0
? scroll.anchorItemKey
: ValueKey(scroll.liveItems[index].eventId),
key: scroll.keyFor(scroll.liveItems[index].eventId),
),
),
@ -74,7 +72,7 @@ class const ChatTimeline({
jumpToId: jumpToId,
getEventOptions: getEventOptions,
highlightedEvent: highlightedEvent,
key: ValueKey(scroll.historyItems[index].eventId),
key: scroll.keyFor(scroll.historyItems[index].eventId),
),
),
],