41 lines
1.4 KiB
TypeScript
41 lines
1.4 KiB
TypeScript
 
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/*
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Copyright 2022 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { useEffect, useState } from "react";
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import { EventType } from "matrix-js-sdk/src/@types/event";
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import { MatrixEvent } from "matrix-js-sdk/src/models/event";
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import { Room } from "matrix-js-sdk/src/models/room";
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import { RoomStateEvent } from "matrix-js-sdk/src/models/room-state";
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import { useTypedEventEmitter } from "../useEventEmitter";
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export const getTopic = (room: Room) => {
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return room?.currentState?.getStateEvents(EventType.RoomTopic, "")?.getContent()?.topic;
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};
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export function useTopic(room: Room): string {
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const [topic, setTopic] = useState(getTopic(room));
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useTypedEventEmitter(room.currentState, RoomStateEvent.Events, (ev: MatrixEvent) => {
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if (ev.getType() !== EventType.RoomTopic) return;
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setTopic(getTopic(room));
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});
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useEffect(() => {
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setTopic(getTopic(room));
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}, [room]);
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return topic;
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}
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