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feat: add messagesIndex to keep track of list indexes

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This commit is contained in:
Gordon Hayes
2021-10-06 15:35:22 +02:00
parent 5998982bc4
commit b9866a709a
1 changed files with 9 additions and 3 deletions
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packages/stream_chat_flutter/lib/src/message_list_view.dart
+9 -3
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@@ -336,6 +336,8 @@ class _MessageListViewState extends State<MessageListView> {
List<Message> messages = <Message>[]; List<Message> messages = <Message>[];
Map<String, int> messagesIndex = {};
bool initialMessageHighlightComplete = false; bool initialMessageHighlightComplete = false;
bool _inBetweenList = false; bool _inBetweenList = false;
@@ -379,6 +381,9 @@ class _MessageListViewState extends State<MessageListView> {
Widget _buildListView(List<Message> data) { Widget _buildListView(List<Message> data) {
messages = data; messages = data;
for (var index = 0; index < messages.length; index++) {
messagesIndex[messages[index].id] = index;
}
final newMessagesListLength = messages.length; final newMessagesListLength = messages.length;
if (_messageListLength != null) { if (_messageListLength != null) {
@@ -471,9 +476,10 @@ class _MessageListViewState extends State<MessageListView> {
itemCount: messages.length, itemCount: messages.length,
findChildIndexCallback: (Key key) { findChildIndexCallback: (Key key) {
final indexedKey = key as IndexedKey; final indexedKey = key as IndexedKey;
final index = messages.indexWhere( final index = messagesIndex[indexedKey.value];
(element) => element.id == indexedKey.value); if (index != null) {
return ((index + 2) * 2) - 1; return ((index + 2) * 2) - 1;
}
}, },
// Item Count -> 8 (1 parent, 2 header+footer, 2 top+bottom, 3 messages) // Item Count -> 8 (1 parent, 2 header+footer, 2 top+bottom, 3 messages)