matrix-react-sdk/lib/hooks/room/useTopic.js

SDK for matrix.org using React

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getTopic = void 0;
exports.useTopic = useTopic;
var _react = require("react");
var _matrix = require("matrix-js-sdk/src/matrix");
var _useEventEmitter = require("../useEventEmitter");
/*
Copyright 2024 New Vector Ltd.
Copyright 2022 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

const getTopic = room => {
  const content = room?.currentState?.getStateEvents(_matrix.EventType.RoomTopic, "")?.getContent();
  return !!content ? _matrix.ContentHelpers.parseTopicContent(content) : null;
};

/**
 * Helper to retrieve the room topic for given room
 * @param room
 * @returns the raw text and an html parsion version of the room topic
 */
exports.getTopic = getTopic;
function useTopic(room) {
  const [topic, setTopic] = (0, _react.useState)(getTopic(room));
  (0, _useEventEmitter.useTypedEventEmitter)(room?.currentState, _matrix.RoomStateEvent.Events, ev => {
    if (ev.getType() !== _matrix.EventType.RoomTopic) return;
    setTopic(getTopic(room));
  });
  (0, _react.useEffect)(() => {
    setTopic(getTopic(room));
  }, [room]);
  return topic;
}
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