839329b52a
* Introduce a hook to track active room This hook simply keeps a state which tracks the index of the active room in the list of rooms passed through props. This index will be recomputed if the active rooms changes or if the list itself changed. * Use hook in the view model * Write tests * Fix broken tests
45 lines
1.6 KiB
TypeScript
45 lines
1.6 KiB
TypeScript
/*
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* Copyright 2025 New Vector Ltd.
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*
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* SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
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* Please see LICENSE files in the repository root for full details.
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*/
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import { useCallback, useEffect, useState } from "react";
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import { SdkContextClass } from "../../../contexts/SDKContext";
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import { useDispatcher } from "../../../hooks/useDispatcher";
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import dispatcher from "../../../dispatcher/dispatcher";
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import { Action } from "../../../dispatcher/actions";
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import type { Room } from "matrix-js-sdk/src/matrix";
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/**
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* Tracks the index of the active room in the given array of rooms.
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* @param rooms list of rooms
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* @returns index of the active room or undefined otherwise.
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*/
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export function useIndexForActiveRoom(rooms: Room[]): number | undefined {
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const [index, setIndex] = useState<number | undefined>(undefined);
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const calculateIndex = useCallback(
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(newRoomId?: string) => {
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const activeRoomId = newRoomId ?? SdkContextClass.instance.roomViewStore.getRoomId();
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const index = rooms.findIndex((room) => room.roomId === activeRoomId);
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setIndex(index === -1 ? undefined : index);
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},
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[rooms],
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);
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// Re-calculate the index when the active room has changed.
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useDispatcher(dispatcher, (payload) => {
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if (payload.action === Action.ActiveRoomChanged) calculateIndex(payload.newRoomId);
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});
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// Re-calculate the index when the list of rooms has changed.
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useEffect(() => {
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calculateIndex();
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}, [calculateIndex, rooms]);
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return index;
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}
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