Improve spotlight accessibility by adding context menus (#8907)

* Extract room general context menu from roomtile
* Create hook to access and change a room’s notification state
* Extract room notification context menu from roomtile
* Add room context menus to rooms in spotlight
* Make arrow movement apply to the whole dialog, not just the input box

src/hooks/useRoomNotificationState.ts

@@ -0,0 +1,41 @@
+/*
+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 { useCallback, useMemo, useState } from "react";
+import { Room } from "matrix-js-sdk/src/matrix";
+
+import { RoomNotifState } from "../RoomNotifs";
+import { EchoChamber } from "../stores/local-echo/EchoChamber";
+import { PROPERTY_UPDATED } from "../stores/local-echo/GenericEchoChamber";
+import { CachedRoomKey } from "../stores/local-echo/RoomEchoChamber";
+import { useEventEmitter } from "./useEventEmitter";
+
+export const useNotificationState = (room: Room): [RoomNotifState, (state: RoomNotifState) => void] => {
+    const echoChamber = useMemo(() => EchoChamber.forRoom(room), [room]);
+    const [notificationState, setNotificationState] = useState<RoomNotifState>(
+        echoChamber.notificationVolume,
+    );
+    useEventEmitter(echoChamber, PROPERTY_UPDATED, (key: CachedRoomKey) => {
+        if (key === CachedRoomKey.NotificationVolume) {
+            setNotificationState(echoChamber.notificationVolume);
+        }
+    });
+    const setter = useCallback(
+        (state: RoomNotifState) => echoChamber.notificationVolume = state,
+        [echoChamber],
+    );
+    return [notificationState, setter];
+};