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Update thread summary when latest event gets decrypted #8564

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May 11, 2022
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Update thread summary when latest event gets decrypted #8564

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23 changes: 13 additions & 10 deletions src/components/views/rooms/ThreadSummary.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -14,16 +14,16 @@ See the License for the specific language governing permissions and
limitations under the License.
*/

import React, { useContext } from "react";
import React, { useContext, useState } from "react";
import { Thread, ThreadEvent } from "matrix-js-sdk/src/models/thread";
import { MatrixEvent, MatrixEventEvent } from "matrix-js-sdk/src/models/event";
import { IContent, MatrixEvent, MatrixEventEvent } from "matrix-js-sdk/src/models/event";

import { _t } from "../../../languageHandler";
import { CardContext } from "../right_panel/context";
import AccessibleButton, { ButtonEvent } from "../elements/AccessibleButton";
import { showThread } from "../../../dispatcher/dispatch-actions/threads";
import PosthogTrackers from "../../../PosthogTrackers";
import { useTypedEventEmitterState } from "../../../hooks/useEventEmitter";
import { useTypedEventEmitter, useTypedEventEmitterState } from "../../../hooks/useEventEmitter";
import RoomContext from "../../../contexts/RoomContext";
import { MessagePreviewStore } from "../../../stores/room-list/MessagePreviewStore";
import MemberAvatar from "../avatars/MemberAvatar";
Expand Down Expand Up @@ -76,18 +76,21 @@ export const ThreadMessagePreview = ({ thread, showDisplayname = false }: IPrevi
const cli = useContext(MatrixClientContext);

const lastReply = useTypedEventEmitterState(thread, ThreadEvent.Update, () => thread.replyToEvent);
// track the replacing event id as a means to regenerate the thread message preview
const replacingEventId = useTypedEventEmitterState(
lastReply,
MatrixEventEvent.Replaced,
() => lastReply?.replacingEventId(),
);
// track the content as a means to regenerate the thread message preview upon edits & decryption
const [content, setContent] = useState<IContent>(lastReply?.getContent());
useTypedEventEmitter(lastReply, MatrixEventEvent.Replaced, () => {
setContent(lastReply.getContent());
});
const awaitDecryption = lastReply?.shouldAttemptDecryption() || lastReply?.isBeingDecrypted();
useTypedEventEmitter(awaitDecryption ? lastReply : null, MatrixEventEvent.Decrypted, () => {
setContent(lastReply.getContent());
});

const preview = useAsyncMemo(async () => {
if (!lastReply) return;
await cli.decryptEventIfNeeded(lastReply);
return MessagePreviewStore.instance.generatePreviewForEvent(lastReply);
}, [lastReply, replacingEventId]);
}, [lastReply, content]);
if (!preview) return null;

return <>
Expand Down