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feat: Added sticky header to display position data

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This commit is contained in:
Deven Joshi
2020-10-27 14:14:00 +05:30
parent 6de4ee9963
commit 1cb007ec2d
1 changed files with 19 additions and 15 deletions
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lib/src/message_list_view.dart
+19 -15
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@@ -150,7 +150,6 @@ class _MessageListViewState extends State<MessageListView> {
List<Message> _newMessageList = []; List<Message> _newMessageList = [];
Function _onThreadTap; Function _onThreadTap;
bool _showScrollToBottom = false; bool _showScrollToBottom = false;
var positionData;
@override @override
Widget build(BuildContext context) { Widget build(BuildContext context) {
@@ -164,7 +163,8 @@ class _MessageListViewState extends State<MessageListView> {
children: [ children: [
NotificationListener<ScrollNotification>( NotificationListener<ScrollNotification>(
onNotification: (_) { onNotification: (_) {
if (_scrollController.offset < 150 && _newMessageList.isNotEmpty) { if (_scrollController.offset < 150 &&
_newMessageList.isNotEmpty) {
setState(() { setState(() {
_messages.insertAll(0, _newMessageList); _messages.insertAll(0, _newMessageList);
_newMessageList.clear(); _newMessageList.clear();
@@ -193,7 +193,8 @@ class _MessageListViewState extends State<MessageListView> {
children: <Widget>[ children: <Widget>[
buildParentMessage(widget.parentMessage), buildParentMessage(widget.parentMessage),
Padding( Padding(
padding: const EdgeInsets.symmetric(horizontal: 32), padding:
const EdgeInsets.symmetric(horizontal: 32),
child: Container( child: Container(
padding: const EdgeInsets.all(8), padding: const EdgeInsets.all(8),
child: Text( child: Text(
@@ -273,7 +274,10 @@ class _MessageListViewState extends State<MessageListView> {
); );
} }
return VisibleNotifierWidget(child: messageWidget, data: i,); return VisibleNotifierWidget(
child: messageWidget,
data: i,
);
}, },
childCount: _messages.length + 2, childCount: _messages.length + 2,
findChildIndexCallback: (key) { findChildIndexCallback: (key) {
@@ -297,19 +301,19 @@ class _MessageListViewState extends State<MessageListView> {
} }
return _buildScrollToBottom(streamChannel); return _buildScrollToBottom(streamChannel);
}), }),
if(positionData != null)
Positioned( Positioned(
top: 20.0, top: 20.0,
child: WidgetsVisibilityListener( child: WidgetsVisibilityConsumer(
listener: (context, event) { builder: (context, event) {
setState(() { if(event.positionDataList == null || event.positionDataList.isEmpty) {
positionData = event.positionDataList.isNotEmpty ? event.positionDataList[0].data : null; return Container();
}); }
},
child: DateDivider( return DateDivider(
dateTime: _messages[positionData].createdAt.toLocal(), dateTime: _messages[event.positionDataList[0].data].createdAt.toLocal(),
), );
), },
),
), ),
], ],
), ),