render redacted messages

src/domain/session/room/timeline/tiles/RedactedTile.js

@@ -0,0 +1,27 @@
+/*
+Copyright 2020 Bruno Windels <bruno@windels.cloud>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {BaseTextTile} from "./BaseTextTile.js";
+
+export class RedactedTile extends BaseTextTile {
+    get shape() {
+        return "message-status"
+    }
+
+    _getBodyAsString() {
+        return "This message has been deleted.";
+    }
+}

src/domain/session/room/timeline/tiles/SimpleTile.js

@@ -84,8 +84,13 @@ export class SimpleTile extends ViewModel {
 
     // update received for already included (falls within sort keys) entry
     updateEntry(entry, params) {
-        this._entry = entry;
+        if (entry.isRedacted) {
-        return UpdateAction.Update(params);
+            // recreate the tile if the entry becomes redacted
+            return UpdateAction.Replace(params);
+        } else {
+            this._entry = entry;
+            return UpdateAction.Update(params);
+        }
     }
 
     // return whether the tile should be removed

src/domain/session/room/timeline/tilesCreator.js

@@ -16,6 +16,7 @@ limitations under the License.
 
 import {GapTile} from "./tiles/GapTile.js";
 import {TextTile} from "./tiles/TextTile.js";
+import {RedactedTile} from "./tiles/RedactedTile.js";
 import {ImageTile} from "./tiles/ImageTile.js";
 import {VideoTile} from "./tiles/VideoTile.js";
 import {FileTile} from "./tiles/FileTile.js";
@@ -31,6 +32,8 @@ export function tilesCreator(baseOptions) {
         const options = Object.assign({entry, emitUpdate}, baseOptions);
         if (entry.isGap) {
             return new GapTile(options);
+        } else if (entry.isRedacted) {
+            return new RedactedTile(options);
         } else if (entry.isPending && entry.pendingEvent.isMissingAttachments) {
             return new MissingAttachmentTile(options);
         } else if (entry.eventType) {

src/matrix/room/timeline/entries/EventEntry.js

@@ -112,4 +112,8 @@ export class EventEntry extends BaseEntry {
     get relatedEventId() {
         return this._eventEntry.event.redacts;
     }
+
+    get isRedacted() {
+        return !!this._eventEntry.event.unsigned?.redacted_because;
+    }
 }