Show a lobby screen in video rooms (#8287)

* Show a lobby screen in video rooms

* Add connecting state

* Test VideoRoomView

* Test VideoLobby

* Get the local video stream with useAsyncMemo

* Clean up code review nits

* Explicitly state what !important is overriding

* Use spacing variables

* Wait for video channel messaging

* Update join button copy

* Show frame on both the lobby and widget

* Force dark theme for video lobby

* Wait for the widget to be ready

* Make VideoChannelStore constructor private

* Allow video lobby to shrink

* Add invite button to video room header

* Show connected members on lobby screen

* Make avatars in video lobby clickable

* Increase video channel store timeout

* Fix Jitsi Meet getting wedged on startup in Chrome and Safari

* Revert "Fix Jitsi Meet getting wedged on startup in Chrome and Safari"

This reverts commit 9f77b8c227c1a5bffa5d91b0c48bf3bbc44d4cec.

* Disable device buttons while connecting

* Factor RoomFacePile into a separate file

* Fix i18n lint

* Fix switching video channels while connected

* Properly limit number of connected members in face pile

* Fix CSS lint

src/components/structures/VideoRoomView.tsx

@@ -0,0 +1,67 @@
+/*
+Copyright 2022 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, { FC, useContext, useState, useMemo } from "react";
+import { logger } from "matrix-js-sdk/src/logger";
+import { Room } from "matrix-js-sdk/src/models/room";
+
+import MatrixClientContext from "../../contexts/MatrixClientContext";
+import { useEventEmitter } from "../../hooks/useEventEmitter";
+import { getVideoChannel } from "../../utils/VideoChannelUtils";
+import WidgetStore from "../../stores/WidgetStore";
+import { UPDATE_EVENT } from "../../stores/AsyncStore";
+import VideoChannelStore, { VideoChannelEvent } from "../../stores/VideoChannelStore";
+import AppTile from "../views/elements/AppTile";
+import VideoLobby from "../views/voip/VideoLobby";
+
+const VideoRoomView: FC<{ room: Room, resizing: boolean }> = ({ room, resizing }) => {
+    const cli = useContext(MatrixClientContext);
+    const store = VideoChannelStore.instance;
+
+    // In case we mount before the WidgetStore knows about our Jitsi widget
+    const [widgetLoaded, setWidgetLoaded] = useState(false);
+    useEventEmitter(WidgetStore.instance, UPDATE_EVENT, (roomId: string) => {
+        if (roomId === null || roomId === room.roomId) setWidgetLoaded(true);
+    });
+
+    const app = useMemo(() => {
+        const app = getVideoChannel(room.roomId);
+        if (!app) logger.warn(`No video channel for room ${room.roomId}`);
+        return app;
+    }, [room, widgetLoaded]); // eslint-disable-line react-hooks/exhaustive-deps
+
+    const [connected, setConnected] = useState(store.connected && store.roomId === room.roomId);
+    useEventEmitter(store, VideoChannelEvent.Connect, () => setConnected(store.roomId === room.roomId));
+    useEventEmitter(store, VideoChannelEvent.Disconnect, () => setConnected(false));
+
+    if (!app) return null;
+
+    return <div className="mx_VideoRoomView">
+        { connected ? null : <VideoLobby room={room} /> }
+        { /* We render the widget even if we're disconnected, so it stays loaded */ }
+        <AppTile
+            app={app}
+            room={room}
+            userId={cli.credentials.userId}
+            creatorUserId={app.creatorUserId}
+            waitForIframeLoad={app.waitForIframeLoad}
+            showMenubar={false}
+            pointerEvents={resizing ? "none" : null}
+        />
+    </div>;
+};
+
+export default VideoRoomView;