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Extract useRoomState hook into hooks directory

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This commit is contained in:
Michael Telatynski 2021-06-07 16:42:59 +01:00
parent a7eb09af1e
commit 4725a9e8fa
2 changed files with 41 additions and 18 deletions
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19
src/components/views/right_panel/PinnedMessagesCard.tsx
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@ -28,6 +28,7 @@ import { useEventEmitter } from "../../../hooks/useEventEmitter";
import PinningUtils from "../../../utils/PinningUtils";
import { useAsyncMemo } from "../../../hooks/useAsyncMemo";
import PinnedEventTile from "../rooms/PinnedEventTile";
import { useRoomState } from "../../../hooks/useRoomState";
interface IProps {
room: Room;
@ -75,24 +76,6 @@ export const useReadPinnedEvents = (room: Room): Set<string> => {
return readPinnedEvents;
};
const useRoomState = <T extends any>(room: Room, mapper: (state: RoomState) => T): T => {
const [value, setValue] = useState<T>(room ? mapper(room.currentState) : undefined);
const update = useCallback(() => {
if (!room) return;
setValue(mapper(room.currentState));
}, [room, mapper]);
useEventEmitter(room?.currentState, "RoomState.events", update);
useEffect(() => {
update();
return () => {
setValue(undefined);
};
}, [update]);
return value;
};
const PinnedMessagesCard = ({ room, onClose }: IProps) => {
const cli = useContext(MatrixClientContext);
const canUnpin = useRoomState(room, state => state.mayClientSendStateEvent(EventType.RoomPinnedEvents, cli));

40
src/hooks/useRoomState.ts Normal file
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@ -0,0 +1,40 @@
/*
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, useEffect, useState } from "react";
import { Room } from "matrix-js-sdk/src/models/room";
import { RoomState } from "matrix-js-sdk/src/models/room-state";
import { useEventEmitter } from "./useEventEmitter";
// Hook to simplify watching Matrix Room state
export const useRoomState = <T extends any>(room: Room, mapper: (state: RoomState) => T): T => {
const [value, setValue] = useState<T>(room ? mapper(room.currentState) : undefined);
const update = useCallback(() => {
if (!room) return;
setValue(mapper(room.currentState));
}, [room, mapper]);
useEventEmitter(room?.currentState, "RoomState.events", update);
useEffect(() => {
update();
return () => {
setValue(undefined);
};
}, [update]);
return value;
};