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';
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import 'Event.dart';
import 'Room.dart';
import 'User.dart';
import 'sync/EventUpdate.dart';
typedef onTimelineUpdateCallback = void Function();
typedef onTimelineInsertCallback = void Function(int insertID);
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/// 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 = [];
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final onTimelineUpdateCallback onUpdate;
final onTimelineInsertCallback onInsert;
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StreamSubscription<EventUpdate> sub;
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bool _requestingHistoryLock = false;
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Future<void> requestHistory(
{int historyCount = Room.DefaultHistoryCount}) async {
if (!_requestingHistoryLock) {
_requestingHistoryLock = true;
await room.requestHistory(
historyCount: historyCount,
onHistoryReceived: () {
if (room.prev_batch.isEmpty || room.prev_batch == null) events = [];
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},
);
_requestingHistoryLock = false;
}
}
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Timeline({this.room, this.events, this.onUpdate, this.onInsert}) {
sub ??= room.client.connection.onEvent.stream.listen(_handleEventUpdate);
}
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int _findEvent({String event_id, String unsigned_txid}) {
int i;
for (i = 0; i < events.length; i++) {
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if (events[i].eventId == event_id ||
(unsigned_txid != null && events[i].eventId == unsigned_txid)) break;
}
return i;
}
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void _handleEventUpdate(EventUpdate eventUpdate) async {
try {
if (eventUpdate.roomID != room.id) return;
if (eventUpdate.type == "timeline" || eventUpdate.type == "history") {
if (eventUpdate.content["status"] == -2) {
int i = _findEvent(event_id: eventUpdate.content["event_id"]);
if (i < events.length) events.removeAt(i);
}
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// Is this event already in the timeline?
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else if (eventUpdate.content.containsKey("unsigned") &&
eventUpdate.content["unsigned"]["transaction_id"] is String) {
int i = _findEvent(
event_id: eventUpdate.content["event_id"],
unsigned_txid: eventUpdate.content.containsKey("unsigned")
? eventUpdate.content["unsigned"]["transaction_id"]
: null);
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if (i < events.length) {
events[i] = Event.fromJson(eventUpdate.content, room);
}
} else {
Event newEvent;
User senderUser = await room.client.store
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?.getUser(matrixID: eventUpdate.content["sender"], room: room);
if (senderUser != null) {
eventUpdate.content["displayname"] = senderUser.displayName;
eventUpdate.content["avatar_url"] = senderUser.avatarUrl.mxc;
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}
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newEvent = Event.fromJson(eventUpdate.content, room);
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if (eventUpdate.type == "history" &&
events.indexWhere(
(e) => e.eventId == eventUpdate.content["event_id"]) !=
-1) return;
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events.insert(0, newEvent);
if (onInsert != null) onInsert(0);
}
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}
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sortAndUpdate();
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} catch (e) {
if (room.client.debug) {
print("[WARNING] (_handleEventUpdate) ${e.toString()}");
}
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}
}
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sortAndUpdate() {
events
?.sort((a, b) => b.time.toTimeStamp().compareTo(a.time.toTimeStamp()));
if (onUpdate != null) onUpdate();
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}
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}