famedlysdk/lib/src/Timeline.dart

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/*
* Copyright (c) 2019 Zender & Kurtz GbR.
*
* Authors:
* Christian Pauly <krille@famedly.com>
* Marcel Radzio <mtrnord@famedly.com>
*
* This file is part of famedlysdk.
*
* famedlysdk is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* famedlysdk is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with famedlysdk. If not, see <http://www.gnu.org/licenses/>.
*/
import 'dart:async';
import 'Event.dart';
import 'Room.dart';
import 'User.dart';
import 'sync/EventUpdate.dart';
/// Represents the timeline of a room. The callbacks [onUpdate], [onDelete],
/// [onInsert] and [onResort] will be triggered automatically. The initial
/// event list will be retreived when created by the [room.getTimeline] method.
class Timeline {
final Room room;
List<Event> events = [];
final onUpdateCallback onUpdate;
final onInsertCallback onInsert;
StreamSubscription<EventUpdate> sub;
Timeline({this.room, this.events, this.onUpdate, this.onInsert}) {
sub ??= room.client.connection.onEvent.stream.listen(_handleEventUpdate);
}
void _handleEventUpdate(EventUpdate eventUpdate) async {
try {
if (eventUpdate.roomID != room.id) return;
if (eventUpdate.type == "timeline" || eventUpdate.type == "history") {
if (!eventUpdate.content.containsKey("id"))
eventUpdate.content["id"] = eventUpdate.content["event_id"];
User user = await room.client.store
?.getUser(matrixID: eventUpdate.content["sender"], room: room);
if (user != null) {
eventUpdate.content["displayname"] = user.displayName;
eventUpdate.content["avatar_url"] = user.avatarUrl.mxc;
}
Event newEvent = Event.fromJson(eventUpdate.content, room);
events.insert(0, newEvent);
onInsert(0);
}
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sortAndUpdate();
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} catch (e) {
print("[WARNING] ${e.toString()}");
sub.cancel();
}
}
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sortAndUpdate() {
events
?.sort((a, b) => b.time.toTimeStamp().compareTo(a.time.toTimeStamp()));
onUpdate();
}
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}
typedef onUpdateCallback = void Function();
typedef onInsertCallback = void Function(int insertID);