Merge pull request #5792 from matrix-org/t3chguy/spaces4.12

Fixing spaces papercuts

src/components/views/elements/FacePile.tsx

@@ -0,0 +1,66 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+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 React, { HTMLAttributes } from "react";
+import { Room } from "matrix-js-sdk/src/models/room";
+import { RoomMember } from "matrix-js-sdk/src/models/room-member";
+import { sortBy } from "lodash";
+
+import MemberAvatar from "../avatars/MemberAvatar";
+import { _t } from "../../../languageHandler";
+import DMRoomMap from "../../../utils/DMRoomMap";
+import TextWithTooltip from "../elements/TextWithTooltip";
+import { useRoomMembers } from "../../../hooks/useRoomMembers";
+
+const DEFAULT_NUM_FACES = 5;
+
+interface IProps extends HTMLAttributes<HTMLSpanElement> {
+    room: Room;
+    onlyKnownUsers?: boolean;
+    numShown?: number;
+}
+
+const isKnownMember = (member: RoomMember) => !!DMRoomMap.shared().getDMRoomsForUserId(member.userId)?.length;
+
+const FacePile = ({ room, onlyKnownUsers = true, numShown = DEFAULT_NUM_FACES, ...props }: IProps) => {
+    let members = useRoomMembers(room);
+
+    // sort users with an explicit avatar first
+    const iteratees = [member => !!member.getMxcAvatarUrl()];
+    if (onlyKnownUsers) {
+        members = members.filter(isKnownMember);
+    } else {
+        // sort known users first
+        iteratees.unshift(member => isKnownMember(member));
+    }
+    if (members.length < 1) return null;
+
+    const shownMembers = sortBy(members, iteratees).slice(0, numShown);
+    return <div {...props} className="mx_FacePile">
+        <div className="mx_FacePile_faces">
+            { shownMembers.map(member => {
+                return <TextWithTooltip key={member.userId} tooltip={member.name}>
+                    <MemberAvatar member={member} width={28} height={28} />
+                </TextWithTooltip>;
+            }) }
+        </div>
+        { onlyKnownUsers && <span>
+            { _t("%(count)s people you know have already joined", { count: members.length }) }
+        </span> }
+    </div>
+};
+
+export default FacePile;