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Merge pull request #108 from GetStream/feature/messageListView

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add scroll to bottom fab
This commit is contained in:
Salvatore Giordano
2020-10-20 11:16:04 +02:00
committed by GitHub
parent 87bc225fe3 9be191b856
commit 58bcb3391c
3 changed files with 176 additions and 109 deletions
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lib/src/message_list_view.dart
+175 -107
View File
@@ -97,6 +97,7 @@ class MessageListView extends StatefulWidget {
/// Instantiate a new MessageListView
MessageListView({
Key key,
this.showScrollToBottom = true,
this.messageBuilder,
this.parentMessageBuilder,
this.parentMessage,
@@ -120,6 +121,9 @@ class MessageListView extends StatefulWidget {
/// By default it calls [Navigator.push] using the widget built using [threadBuilder]
final ThreadTapCallback onThreadTap;
/// If true will show a scroll to bottom message when there are new messages and the scroll offset is not zero
final bool showScrollToBottom;
/// Parent message in case of a thread
final Message parentMessage;
@@ -144,132 +148,193 @@ class _MessageListViewState extends State<MessageListView> {
List<Message> _messages = [];
List<Message> _newMessageList = [];
Function _onThreadTap;
bool _showScrollToBottom = false;
@override
Widget build(BuildContext context) {
final streamChannel = StreamChannel.of(context);
/// TODO: find a better solution when (https://github.com/flutter/flutter/issues/21023) is fixed
return NotificationListener<ScrollNotification>(
onNotification: (_) {
if (_scrollController.offset < 150 && _newMessageList.isNotEmpty) {
setState(() {
_messages.insertAll(0, _newMessageList);
_newMessageList.clear();
});
}
return true;
},
child: ListView.custom(
key: Key('messageListView'),
physics: widget.scrollPhysics,
keyboardDismissBehavior: widget.keyboardDismissBehavior,
controller: _scrollController,
reverse: true,
childrenDelegate: SliverChildBuilderDelegate(
(context, i) {
if (i == _messages.length + 1) {
if (widget.parentMessage != null) {
if (widget.parentMessageBuilder != null) {
return widget.parentMessageBuilder(
return Stack(
children: [
NotificationListener<ScrollNotification>(
onNotification: (_) {
if (_scrollController.offset < 150 && _newMessageList.isNotEmpty) {
setState(() {
_messages.insertAll(0, _newMessageList);
_newMessageList.clear();
});
}
return true;
},
child: ListView.custom(
key: Key('messageListView'),
physics: widget.scrollPhysics,
keyboardDismissBehavior: widget.keyboardDismissBehavior,
controller: _scrollController,
reverse: true,
childrenDelegate: SliverChildBuilderDelegate(
(context, i) {
if (i == _messages.length + 1) {
if (widget.parentMessage != null) {
if (widget.parentMessageBuilder != null) {
return widget.parentMessageBuilder(
context,
widget.parentMessage,
);
} else {
return Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
buildParentMessage(widget.parentMessage),
Padding(
padding: const EdgeInsets.symmetric(horizontal: 32),
child: Container(
padding: const EdgeInsets.all(8),
child: Text(
'Start of thread',
textAlign: TextAlign.center,
),
color:
Theme.of(context).accentColor.withAlpha(50),
),
),
],
);
}
} else {
return SizedBox();
}
}
if (i == _messages.length) {
return _buildLoadingIndicator(streamChannel);
}
final message = _messages[i];
final nextMessage = i > 0 ? _messages[i - 1] : null;
Widget messageWidget;
if (i == 0) {
messageWidget = _buildBottomMessage(
context,
widget.parentMessage,
message,
_messages,
streamChannel,
);
} else if (i == _messages.length - 1) {
messageWidget = _buildTopMessage(
context,
message,
_messages,
streamChannel,
);
} else {
if (widget.messageBuilder != null) {
messageWidget = Builder(
key: ValueKey<String>('MESSAGE-${message.id}'),
builder: (_) => widget.messageBuilder(
context,
MessageDetails(
context,
message,
_messages,
i,
),
_messages),
);
} else {
messageWidget = buildMessage(message, _messages, i);
}
}
if (nextMessage != null &&
!Jiffy(message.createdAt.toLocal())
.isSame(nextMessage.createdAt.toLocal(), Units.DAY)) {
return Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
buildParentMessage(widget.parentMessage),
messageWidget,
Padding(
padding: const EdgeInsets.symmetric(horizontal: 32),
child: Container(
padding: const EdgeInsets.all(8),
child: Text(
'Start of thread',
textAlign: TextAlign.center,
),
color: Theme.of(context).accentColor.withAlpha(50),
),
padding: const EdgeInsets.symmetric(vertical: 12.0),
child: widget.dateDividerBuilder != null
? widget.dateDividerBuilder(
nextMessage.createdAt.toLocal())
: DateDivider(
dateTime: nextMessage.createdAt.toLocal(),
),
),
],
);
}
} else {
return SizedBox();
}
}
if (i == _messages.length) {
return _buildLoadingIndicator(streamChannel);
}
final message = _messages[i];
final nextMessage = i > 0 ? _messages[i - 1] : null;
Widget messageWidget;
if (i == 0) {
messageWidget = _buildBottomMessage(
context,
message,
_messages,
streamChannel,
);
} else if (i == _messages.length - 1) {
messageWidget = _buildTopMessage(
context,
message,
_messages,
streamChannel,
);
} else {
if (widget.messageBuilder != null) {
messageWidget = Builder(
key: ValueKey<String>('MESSAGE-${message.id}'),
builder: (_) => widget.messageBuilder(
context,
MessageDetails(
context,
message,
_messages,
i,
),
_messages),
);
} else {
messageWidget = buildMessage(message, _messages, i);
}
}
if (nextMessage != null &&
!Jiffy(message.createdAt.toLocal())
.isSame(nextMessage.createdAt.toLocal(), Units.DAY)) {
return Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
messageWidget,
Padding(
padding: const EdgeInsets.symmetric(vertical: 12.0),
child: widget.dateDividerBuilder != null
? widget
.dateDividerBuilder(nextMessage.createdAt.toLocal())
: DateDivider(
dateTime: nextMessage.createdAt.toLocal(),
),
),
],
);
}
return messageWidget;
},
childCount: _messages.length + 2,
findChildIndexCallback: (key) {
final ValueKey<String> valueKey = key;
final index = _messages
.indexWhere((m) => 'MESSAGE-${m.id}' == valueKey.value);
return index != -1 ? index : null;
},
return messageWidget;
},
childCount: _messages.length + 2,
findChildIndexCallback: (key) {
final ValueKey<String> valueKey = key;
final index = _messages
.indexWhere((m) => 'MESSAGE-${m.id}' == valueKey.value);
return index != -1 ? index : null;
},
),
),
),
if (widget.showScrollToBottom)
StreamBuilder<Event>(
stream: streamChannel.channel.on(
EventType.messageNew,
),
builder: (context, _) {
if (!_showScrollToBottom ||
streamChannel.channel.state.unreadCount == 0) {
return SizedBox();
}
return _buildScrollToBottom(streamChannel);
}),
],
);
}
Widget _buildScrollToBottom(StreamChannelState streamChannel) {
return Positioned(
bottom: 8,
right: 8,
width: 40,
height: 40,
child: Stack(
clipBehavior: Clip.none,
children: [
FloatingActionButton(
backgroundColor: Colors.white,
child: Icon(
StreamIcons.down,
color: Colors.black,
),
onPressed: () {
Future.delayed(Duration(milliseconds: 500), () {
setState(() {
_showScrollToBottom = false;
});
});
_scrollController.animateTo(
0,
duration: Duration(seconds: 1),
curve: Curves.easeInOut,
);
},
),
Positioned(
width: 20,
height: 20,
left: 10,
top: -10,
child: CircleAvatar(
radius: 20,
child: Text(streamChannel.channel.state.unreadCount.toString()),
),
),
],
),
);
}
@@ -381,6 +446,9 @@ class _MessageListViewState extends State<MessageListView> {
}
}
_bottomWasVisible = isVisible;
setState(() {
_showScrollToBottom = !isVisible;
});
},
child: messageWidget,
);
lib/src/reaction_asset.dart → lib/src/reaction_icon.dart
View File
lib/src/stream_chat_theme.dart
+1 -2
View File
@@ -3,10 +3,9 @@ import 'package:stream_chat/stream_chat.dart';
import 'package:stream_chat_flutter/src/channel_header.dart';
import 'package:stream_chat_flutter/src/channel_preview.dart';
import 'package:stream_chat_flutter/src/message_input.dart';
import 'package:stream_chat_flutter/src/reaction_icon.dart';
import 'package:stream_chat_flutter/src/stream_icons.dart';
import 'reaction_asset.dart';
/// Inherited widget providing the [StreamChatThemeData] to the widget tree
class StreamChatTheme extends InheritedWidget {
final StreamChatThemeData data;