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feat: use IndexedKey to track list index

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This commit is contained in:
Gordon Hayes
2021-09-08 17:24:17 +02:00
parent 311b109994
commit 265c0d0637
1 changed files with 13 additions and 9 deletions
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packages/stream_chat_flutter/lib/src/message_list_view.dart
+13 -9
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@@ -467,9 +467,9 @@ class _MessageListViewState extends State<MessageListView> {
reverse: widget.reverse,
itemCount: messages.length,
findChildIndexCallback: (Key key) {
final String data = (key as ValueKey).value;
final index =
messages.indexWhere((element) => element.id == data);
final indexedKey = key as IndexedKey;
final index = messages.indexWhere(
(element) => element.id == indexedKey.value);
return ((index + 2) * 2) - 1;
},
@@ -600,9 +600,10 @@ class _MessageListViewState extends State<MessageListView> {
messages,
streamChannel!,
i - 2,
i,
);
} else {
messageWidget = buildMessage(message, messages, i - 2);
messageWidget = buildMessage(message, messages, i - 2, i);
}
return messageWidget;
},
@@ -824,11 +825,13 @@ class _MessageListViewState extends State<MessageListView> {
List<Message> messages,
StreamChannelState streamChannel,
int index,
int buildItemIndex,
) {
final messageWidget = buildMessage(message, messages, index);
final messageWidget =
buildMessage(message, messages, index, buildItemIndex);
return VisibilityDetector(
key: ValueKey<String>(message.id),
key: IndexedKey(message.id, buildItemIndex),
onVisibilityChanged: (visibility) {
final isVisible = visibility.visibleBounds != Rect.zero;
if (isVisible) {
@@ -920,12 +923,13 @@ class _MessageListViewState extends State<MessageListView> {
return defaultMessageWidget;
}
Widget buildMessage(Message message, List<Message> messages, int index) {
Widget buildMessage(
Message message, List<Message> messages, int index, int buildItemIndex) {
if ((message.type == 'system' || message.type == 'error') &&
message.text?.isNotEmpty == true) {
return widget.systemMessageBuilder?.call(context, message) ??
SystemMessage(
key: ValueKey<String>(message.id),
key: IndexedKey(message.id, buildItemIndex),
message: message,
onMessageTap: (message) {
if (widget.onSystemMessageTap != null) {
@@ -1005,7 +1009,7 @@ class _MessageListViewState extends State<MessageListView> {
members.firstWhereOrNull((e) => e.user!.id == currentUser!.id);
Widget messageWidget = MessageWidget(
key: ValueKey<String>(message.id),
key: IndexedKey(message.id, buildItemIndex),
message: message,
reverse: isMyMessage,
showReactions: !message.isDeleted,