convert MemberEventListSummary and ELS to Typescript

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/elements/EventListSummary.tsx

@@ -0,0 +1,104 @@
+/*
+Copyright 2019, 2020 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, {ReactChildren, useEffect} from 'react';
+import {MatrixEvent} from "matrix-js-sdk/src/models/event";
+import {RoomMember} from "matrix-js-sdk/src/models/room-member";
+
+import MemberAvatar from '../avatars/MemberAvatar';
+import { _t } from '../../../languageHandler';
+import {useStateToggle} from "../../../hooks/useStateToggle";
+import AccessibleButton from "./AccessibleButton";
+
+interface IProps {
+    // An array of member events to summarise
+    events: MatrixEvent[];
+    // The minimum number of events needed to trigger summarisation
+    threshold?: number;
+    // Whether or not to begin with state.expanded=true
+    startExpanded?: boolean,
+    // The list of room members for which to show avatars next to the summary
+    summaryMembers?: RoomMember[],
+    // The text to show as the summary of this event list
+    summaryText?: string,
+    // An array of EventTiles to render when expanded
+    children: ReactChildren,
+    // Called when the event list expansion is toggled
+    onToggle?(): void;
+}
+
+const EventListSummary: React.FC<IProps> = ({
+    events,
+    children,
+    threshold = 3,
+    onToggle,
+    startExpanded,
+    summaryMembers = [],
+    summaryText,
+}) => {
+    const [expanded, toggleExpanded] = useStateToggle(startExpanded);
+
+    // Whenever expanded changes call onToggle
+    useEffect(() => {
+        if (onToggle) {
+            onToggle();
+        }
+    }, [expanded]); // eslint-disable-line react-hooks/exhaustive-deps
+
+    const eventIds = events.map((e) => e.getId()).join(',');
+
+    // If we are only given few events then just pass them through
+    if (events.length < threshold) {
+        return (
+            <div className="mx_EventListSummary" data-scroll-tokens={eventIds}>
+                { children }
+            </div>
+        );
+    }
+
+    let body;
+    if (expanded) {
+        body = <React.Fragment>
+            <div className="mx_EventListSummary_line">&nbsp;</div>
+            { children }
+        </React.Fragment>;
+    } else {
+        const avatars = summaryMembers.map((m) => <MemberAvatar key={m.userId} member={m} width={14} height={14} />);
+        body = (
+            <div className="mx_EventTile_line">
+                <div className="mx_EventTile_info">
+                    <span className="mx_EventListSummary_avatars" onClick={toggleExpanded}>
+                        { avatars }
+                    </span>
+                    <span className="mx_TextualEvent mx_EventListSummary_summary">
+                        { summaryText }
+                    </span>
+                </div>
+            </div>
+        );
+    }
+
+    return (
+        <li className="mx_EventListSummary" data-scroll-tokens={eventIds}>
+            <AccessibleButton className="mx_EventListSummary_toggle" onClick={toggleExpanded} aria-expanded={expanded}>
+                { expanded ? _t('collapse') : _t('expand') }
+            </AccessibleButton>
+            { body }
+        </li>
+    );
+};
+
+export default EventListSummary;