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Factor out useEventEmitterState hook

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This commit is contained in:
Michael Telatynski
2021-07-28 17:39:56 +01:00
parent cdf0d98c3f
commit b3a28bde89
2 changed files with 21 additions and 7 deletions
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15
src/components/views/spaces/SpacePanel.tsx
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@@ -117,12 +117,15 @@ const SpaceButton: React.FC<IButtonProps> = ({
}; };
const useSpaces = (): [Room[], Room[], Room | null] => { const useSpaces = (): [Room[], Room[], Room | null] => {
const [invites, setInvites] = useState<Room[]>(SpaceStore.instance.invitedSpaces); const invites = useEventEmitterState<Room[]>(SpaceStore.instance, UPDATE_INVITED_SPACES, () => {
useEventEmitter(SpaceStore.instance, UPDATE_INVITED_SPACES, setInvites); return SpaceStore.instance.invitedSpaces;
const [spaces, setSpaces] = useState<Room[]>(SpaceStore.instance.spacePanelSpaces); });
useEventEmitter(SpaceStore.instance, UPDATE_TOP_LEVEL_SPACES, setSpaces); const spaces = useEventEmitterState<Room[]>(SpaceStore.instance, UPDATE_TOP_LEVEL_SPACES, () => {
const [activeSpace, setActiveSpace] = useState<Room>(SpaceStore.instance.activeSpace); return SpaceStore.instance.spacePanelSpaces;
useEventEmitter(SpaceStore.instance, UPDATE_SELECTED_SPACE, setActiveSpace); });
const activeSpace = useEventEmitterState<Room>(SpaceStore.instance, UPDATE_SELECTED_SPACE, () => {
return SpaceStore.instance.activeSpace;
});
return [invites, spaces, activeSpace]; return [invites, spaces, activeSpace];
}; };

13
src/hooks/useEventEmitter.ts
View File

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
limitations under the License. limitations under the License.
*/ */
import { useRef, useEffect } from "react"; import { useRef, useEffect, useState, useCallback } from "react";
import type { EventEmitter } from "events"; import type { EventEmitter } from "events";
type Handler = (...args: any[]) => void; type Handler = (...args: any[]) => void;
@@ -48,3 +48,14 @@ export const useEventEmitter = (emitter: EventEmitter, eventName: string | symbo
[eventName, emitter], // Re-run if eventName or emitter changes [eventName, emitter], // Re-run if eventName or emitter changes
); );
}; };
type Mapper<T> = (...args: any[]) => T;
export const useEventEmitterState = <T>(emitter: EventEmitter, eventName: string | symbol, fn: Mapper<T>): T => {
const [value, setValue] = useState<T>(fn());
const handler = useCallback((...args: any[]) => {
setValue(fn(...args));
}, [fn]);
useEventEmitter(emitter, eventName, handler);
return value;
};