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Merge branch 'soru/fix-audo-cancel' into 'main'

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fix: Don't re-render message widgets on insertion of new messages, making e.g....

Closes #190

See merge request ChristianPauly/fluffychat-flutter!261
This commit is contained in:
Sorunome 2020-11-08 19:07:53 +00:00
commit 5c375d0c15
1 changed files with 43 additions and 15 deletions
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38
lib/views/chat.dart
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@ -601,7 +601,14 @@ class _ChatState extends State<_Chat> {
final filteredEvents = getFilteredEvents(); final filteredEvents = getFilteredEvents();
return ListView.builder( // create a map of eventId --> index to greatly improve performance of
// ListView's findChildIndexCallback
final thisEventsKeyMap = <String, int>{};
for (var i = 0; i < filteredEvents.length; i++) {
thisEventsKeyMap[filteredEvents[i].eventId] = i;
}
return ListView.custom(
padding: EdgeInsets.symmetric( padding: EdgeInsets.symmetric(
horizontal: max( horizontal: max(
0, 0,
@ -611,9 +618,9 @@ class _ChatState extends State<_Chat> {
2), 2),
), ),
reverse: true, reverse: true,
itemCount: filteredEvents.length + 2,
controller: _scrollController, controller: _scrollController,
itemBuilder: (BuildContext context, int i) { childrenDelegate: SliverChildBuilderDelegate(
(BuildContext context, int i) {
return i == filteredEvents.length + 1 return i == filteredEvents.length + 1
? _loadingHistory ? _loadingHistory
? Container( ? Container(
@ -675,7 +682,8 @@ class _ChatState extends State<_Chat> {
), ),
) )
: AutoScrollTag( : AutoScrollTag(
key: ValueKey(i - 1), key: ValueKey(
filteredEvents[i - 1].eventId),
index: i - 1, index: i - 1,
controller: _scrollController, controller: _scrollController,
child: Swipeable( child: Swipeable(
@ -738,7 +746,27 @@ class _ChatState extends State<_Chat> {
: null), : null),
), ),
); );
}); },
childCount: filteredEvents.length + 2,
findChildIndexCallback: (Key key) {
// this method is called very often. As such, it has to be optimized for speed.
if (!(key is ValueKey)) {
return null;
}
final eventId = (key as ValueKey).value;
if (!(eventId is String)) {
return null;
}
// first fetch the last index the event was at
final index = thisEventsKeyMap[eventId];
if (index == null) {
return null;
}
// we need to +1 as 0 is the typing thing at the bottom
return index + 1;
},
),
);
}, },
), ),
), ),