Bare minimum for rendering a room list

This is non-interactive and missing most features users will expect to have

src/components/views/rooms/RoomList2.tsx

@@ -156,7 +156,7 @@ export default class RoomList2 extends React.Component<IProps, IState> {
             const sublist = this.sublistRefs[tagId];
             if (sublist) sublist.current.setHeight(height);
 
-            // TODO: Check overflow
+            // TODO: Check overflow (see old impl)
 
             // Don't store a height for collapsed sublists
             if (!this.sublistCollapseStates[tagId]) {
@@ -178,6 +178,7 @@ export default class RoomList2 extends React.Component<IProps, IState> {
     }
 
     private collectSublistRef(tagId: string, ref: React.RefObject<RoomSublist2>) {
+        // TODO: Is this needed?
         if (!ref) {
             delete this.sublistRefs[tagId];
         } else {
@@ -206,11 +207,9 @@ export default class RoomList2 extends React.Component<IProps, IState> {
             const aesthetics: ITagAesthetics = TAG_AESTHETICS[orderedTagId];
             if (!aesthetics) throw new Error(`Tag ${orderedTagId} does not have aesthetics`);
 
-            const onAddRoomFn = () => {
-                if (!aesthetics.onAddRoom) return;
-                aesthetics.onAddRoom(dis);
-            };
+            const onAddRoomFn = aesthetics.onAddRoom ? () => aesthetics.onAddRoom(dis) : null;
             components.push(<RoomSublist2
+                key={`sublist-${orderedTagId}`}
                 forRooms={true}
                 rooms={orderedRooms}
                 startAsHidden={aesthetics.defaultHidden}

src/components/views/rooms/RoomSublist2.tsx

@@ -17,7 +17,17 @@ limitations under the License.
 */
 
 import * as React from "react";
+import { createRef } from "react";
 import { Room } from "matrix-js-sdk/src/models/room";
+import classNames from 'classnames';
+import IndicatorScrollbar from "../../structures/IndicatorScrollbar";
+import * as RoomNotifs from '../../../RoomNotifs';
+import { RovingTabIndexWrapper } from "../../../accessibility/RovingTabIndex";
+import { _t } from "../../../languageHandler";
+import AccessibleButton from "../../views/elements/AccessibleButton";
+import AccessibleTooltipButton from "../../views/elements/AccessibleTooltipButton";
+import * as FormattingUtils from '../../../utils/FormattingUtils';
+import RoomTile2 from "./RoomTile2";
 
 interface IProps {
     forRooms: boolean;
@@ -40,21 +50,167 @@ interface IProps {
 interface IState {
 }
 
-// TODO: Actually write stub
+// TODO: Finish stub
 export default class RoomSublist2 extends React.Component<IProps, IState> {
+    private headerButton = createRef();
+
     public setHeight(size: number) {
+        // TODO: Do a thing
     }
 
-    public render() {
-        // TODO: Proper rendering
+    private hasTiles(): boolean {
+        return this.numTiles > 0;
+    }
+
+    private get numTiles(): number {
+        // TODO: Account for group invites
+        return (this.props.rooms || []).length;
+    }
+
+    private onAddRoom = (e) => {
+        e.stopPropagation();
+        if (this.props.onAddRoom) this.props.onAddRoom();
+    };
+
+    private renderTiles(): React.ReactElement[] {
+        const tiles: React.ReactElement[] = [];
+
+        if (this.props.rooms) {
+            for (const room of this.props.rooms) {
+                tiles.push(<RoomTile2 room={room} key={`room-${room.roomId}`}/>);
+            }
+        }
+
+        return tiles;
+    }
+
+    private renderHeader(): React.ReactElement {
+        const notifications = !this.props.isInvite
+            ? RoomNotifs.aggregateNotificationCount(this.props.rooms)
+            : {count: 0, highlight: true};
+        const notifCount = notifications.count;
+        const notifHighlight = notifications.highlight;
+
+        // TODO: Title on collapsed
+        // TODO: Incoming call box
+
+        let chevron = null;
+        if (this.hasTiles()) {
+            const chevronClasses = classNames({
+                'mx_RoomSubList_chevron': true,
+                'mx_RoomSubList_chevronRight': false, // isCollapsed
+                'mx_RoomSubList_chevronDown': true, // !isCollapsed
+            });
+            chevron = (<div className={chevronClasses}/>);
+        }
 
-        const rooms = this.props.rooms.map(r => (
-            <div key={r.roomId}>{r.name} ({r.roomId})</div>
-        ));
         return (
-            <div>
-                <h4>{this.props.label}</h4>
-                {rooms}
+            <RovingTabIndexWrapper inputRef={this.headerButton}>
+                {({onFocus, isActive, ref}) => {
+                    const tabIndex = isActive ? 0 : -1;
+
+                    let badge;
+                    if (true) { // !isCollapsed
+                        const badgeClasses = classNames({
+                            'mx_RoomSubList_badge': true,
+                            'mx_RoomSubList_badgeHighlight': notifHighlight,
+                        });
+                        // Wrap the contents in a div and apply styles to the child div so that the browser default outline works
+                        if (notifCount > 0) {
+                            badge = (
+                                <AccessibleButton
+                                    tabIndex={tabIndex}
+                                    className={badgeClasses}
+                                    aria-label={_t("Jump to first unread room.")}
+                                >
+                                    <div>
+                                        {FormattingUtils.formatCount(notifCount)}
+                                    </div>
+                                </AccessibleButton>
+                            );
+                        } else if (this.props.isInvite && this.hasTiles()) {
+                            // Render the `!` badge for invites
+                            badge = (
+                                <AccessibleButton
+                                    tabIndex={tabIndex}
+                                    className={badgeClasses}
+                                    aria-label={_t("Jump to first invite.")}
+                                >
+                                    <div>
+                                        {FormattingUtils.formatCount(this.numTiles)}
+                                    </div>
+                                </AccessibleButton>
+                            );
+                        }
+                    }
+
+                    let addRoomButton = null;
+                    if (!!this.props.onAddRoom) {
+                        addRoomButton = (
+                            <AccessibleTooltipButton
+                                tabIndex={tabIndex}
+                                onClick={this.onAddRoom}
+                                className="mx_RoomSubList_addRoom"
+                                title={this.props.addRoomLabel || _t("Add room")}
+                            />
+                        );
+                    }
+
+                    // TODO: a11y
+                    return (
+                        <div className={"mx_RoomSubList_labelContainer"}>
+                            <AccessibleButton
+                                inputRef={ref}
+                                tabIndex={tabIndex}
+                                className={"mx_RoomSubList_label"}
+                                role="treeitem"
+                                aria-level="1"
+                            >
+                                {chevron}
+                                <span>{this.props.label}</span>
+                            </AccessibleButton>
+                            {badge}
+                            {addRoomButton}
+                        </div>
+                    );
+                }}
+            </RovingTabIndexWrapper>
+        );
+    }
+
+    public render(): React.ReactElement {
+        // TODO: Proper rendering
+        // TODO: Error boundary
+
+        const tiles = this.renderTiles();
+
+        const classes = classNames({
+            // TODO: Proper collapse support
+            'mx_RoomSubList': true,
+            'mx_RoomSubList_hidden': false, // len && isCollapsed
+            'mx_RoomSubList_nonEmpty': this.hasTiles(), // len && !isCollapsed
+        });
+
+        let content = null;
+        if (tiles.length > 0) {
+            // TODO: Lazy list rendering
+            // TODO: Whatever scrolling magic needs to happen here
+            content = (
+                <IndicatorScrollbar className='mx_RoomSubList_scroll'>
+                    {tiles}
+                </IndicatorScrollbar>
+            )
+        }
+
+        // TODO: onKeyDown support
+        return (
+            <div
+                className={classes}
+                role="group"
+                aria-label={this.props.label}
+            >
+                {this.renderHeader()}
+                {content}
             </div>
         );
     }

src/components/views/rooms/RoomTile2.tsx

@@ -0,0 +1,118 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2017 New Vector Ltd
+Copyright 2018 Michael Telatynski <7t3chguy@gmail.com>
+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, { createRef } from "react";
+import { Room } from "matrix-js-sdk/src/models/room";
+import classNames from "classnames";
+import { RovingTabIndexWrapper } from "../../../accessibility/RovingTabIndex";
+import AccessibleButton from "../../views/elements/AccessibleButton";
+import RoomAvatar from "../../views/avatars/RoomAvatar";
+
+interface IProps {
+    room: Room;
+
+    // TODO: Allow faslifying counts (for invites and stuff)
+    // TODO: Transparency?
+    // TODO: Incoming call?
+    // TODO: onClick
+}
+
+interface IState {
+}
+
+// TODO: Finish stub
+export default class RoomTile2 extends React.Component<IProps, IState> {
+    private roomTile = createRef();
+
+    // TODO: Custom status
+    // TODO: Lock icon
+    // TODO: DM indicator
+    // TODO: Presence indicator
+    // TODO: e2e shields
+    // TODO: Handle changes to room aesthetics (name, join rules, etc)
+    // TODO: scrollIntoView?
+    // TODO: hover, badge, etc
+    // TODO: isSelected for hover effects
+    // TODO: Context menu
+    // TODO: a11y
+
+    public render(): React.ReactElement {
+        // TODO: Collapsed state
+        // TODO: Invites
+        // TODO: a11y proper
+        // TODO: Render more than bare minimum
+
+        const classes = classNames({
+            'mx_RoomTile': true,
+            // 'mx_RoomTile_selected': this.state.selected,
+            // 'mx_RoomTile_unread': this.props.unread,
+            // 'mx_RoomTile_unreadNotify': notifBadges,
+            // 'mx_RoomTile_highlight': mentionBadges,
+            // 'mx_RoomTile_invited': isInvite,
+            // 'mx_RoomTile_menuDisplayed': isMenuDisplayed,
+            'mx_RoomTile_noBadges': true, // !badges
+            // 'mx_RoomTile_transparent': this.props.transparent,
+            // 'mx_RoomTile_hasSubtext': subtext && !this.props.collapsed,
+        });
+
+        const avatarClasses = classNames({
+            'mx_RoomTile_avatar': true,
+        });
+
+        // TODO: the original RoomTile uses state for the room name. Do we need to?
+        let name = this.props.room.name;
+        if (typeof name !== 'string') name = '';
+        name = name.replace(":", ":\u200b"); // add a zero-width space to allow linewrapping after the colon
+
+        const nameClasses = classNames({
+            'mx_RoomTile_name': true,
+            'mx_RoomTile_invite': false,
+            'mx_RoomTile_badgeShown': false,
+        });
+
+        return (
+            <React.Fragment>
+                <RovingTabIndexWrapper inputRef={this.roomTile}>
+                    {({onFocus, isActive, ref}) =>
+                        <AccessibleButton
+                            onFocus={onFocus}
+                            tabIndex={isActive ? 0 : -1}
+                            inputRef={ref}
+                            className={classes}
+                            role="treeitem"
+                        >
+                            <div className={avatarClasses}>
+                                <div className="mx_RoomTile_avatar_container">
+                                    <RoomAvatar room={this.props.room} width={24} height={24}/>
+                                </div>
+                            </div>
+                            <div className="mx_RoomTile_nameContainer">
+                                <div className="mx_RoomTile_labelContainer">
+                                    <div title={name} className={nameClasses} tabIndex={-1} dir="auto">
+                                        {name}
+                                    </div>
+                                </div>
+                            </div>
+                        </AccessibleButton>
+                    }
+                </RovingTabIndexWrapper>
+            </React.Fragment>
+        );
+    }
+}