56 lines
1.8 KiB
TypeScript
56 lines
1.8 KiB
TypeScript
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import { EventStatus, IThreadBundledRelationship, MatrixEvent, RelationType } from 'matrix-js-sdk';
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export type ThreadSummaryData = {
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count: number;
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latestTs: number | undefined;
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};
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/**
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* Summary data for a thread root's "N replies" chip.
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*
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* Prefers the live {@link Thread} object when it exists (it reflects local
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* echo + pagination), otherwise falls back to the server-aggregated bundle
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* (`unsigned['m.relations']['m.thread']`) so the chip renders before any
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* Thread object has been created. Returns `undefined` when the root has no
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* thread at all.
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*/
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export const getThreadSummary = (rootEvent: MatrixEvent): ThreadSummaryData | undefined => {
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const thread = rootEvent.getThread();
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if (thread) {
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const lastReply = thread.lastReply();
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return {
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count: thread.length,
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latestTs: lastReply?.getTs(),
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};
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}
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const bundle = rootEvent.getServerAggregatedRelation<IThreadBundledRelationship>(
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RelationType.Thread,
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);
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if (bundle) {
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return {
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count: bundle.count,
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latestTs: bundle.latest_event?.origin_server_ts,
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};
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}
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return undefined;
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};
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/**
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* True when `event` is a still-in-flight (local echo) reply belonging to the
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* given thread root. Used to render the pending strip, since pending thread
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* sends never enter the thread's timelineSet.
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*/
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export const isPendingThreadReply = (event: MatrixEvent, threadRootId: string): boolean => {
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const { status } = event;
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if (status !== EventStatus.SENDING && status !== EventStatus.NOT_SENT) return false;
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// Prefer the SDK's resolved thread root id; fall back to the raw relation
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// content for events the SDK hasn't associated with a thread yet.
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if (event.threadRootId === threadRootId) return true;
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const relation = event.getRelation();
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return relation?.rel_type === RelationType.Thread && relation.event_id === threadRootId;
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};
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