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refactor(player): E.4 — extract playback-progress pub/sub into module (#567)

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The high-frequency PlaybackProgressSnapshot channel — type, mutable
snapshot, listener Set, emit/get/subscribe — moves into a dedicated
src/store/playbackProgress.ts. playerStore re-exports the public 3
(getPlaybackProgressSnapshot, subscribePlaybackProgress, the type) so
the 5+ external callers (PlayerBar, FullscreenPlayer, WaveformSeek,
LyricsPane, MobilePlayerView, TauriEventBridge) keep their existing
imports.

Direct unit tests pin the delta short-circuit (`currentTime <0.005`,
`progress/buffered <0.0002`) that keeps idle CPU bounded. The
end-to-end Tauri-event drive path remains covered by the existing
playerStore.progress characterization test (unchanged).

playerStore 3516 → 3490 LOC.
This commit is contained in:
Frank Stellmacher
2026-05-12 11:58:17 +02:00
committed by GitHub
parent d24514d67e
commit 5b89051817
3 changed files with 162 additions and 42 deletions
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src/store/playerStore.ts
+16 -42
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@@ -33,6 +33,22 @@ import {
import { coerceWaveformBins, waveformBlobLenOk } from '../utils/waveformParse';
import { normalizationAlmostEqual } from '../utils/normalizationCompare';
import { isRecoverableSeekError } from '../utils/seekErrors';
import {
emitPlaybackProgress,
getPlaybackProgressSnapshot,
subscribePlaybackProgress,
type PlaybackProgressSnapshot,
} from './playbackProgress';
// Re-export the playback-progress public surface so existing call sites
// (PlayerBar, FullscreenPlayer, WaveformSeek, LyricsPane, MobilePlayerView,
// TauriEventBridge, plus the progress characterization test) keep their
// `from './playerStore'` imports working.
export {
getPlaybackProgressSnapshot,
subscribePlaybackProgress,
type PlaybackProgressSnapshot,
};
import { getWindowKind } from '../app/windowKind';
import {
_resetQueueUndoStacksForTest,
@@ -475,48 +491,6 @@ const STORE_PROGRESS_COMMIT_MIN_MS = 20_000;
const STORE_PROGRESS_COMMIT_MIN_DELTA_SEC = 5.0;
let lastStoreProgressCommitAt = 0;
export type PlaybackProgressSnapshot = {
currentTime: number;
progress: number;
buffered: number;
};
let playbackProgressSnapshot: PlaybackProgressSnapshot = {
currentTime: 0,
progress: 0,
buffered: 0,
};
const playbackProgressListeners = new Set<(
next: PlaybackProgressSnapshot,
prev: PlaybackProgressSnapshot
) => void>();
function emitPlaybackProgress(next: PlaybackProgressSnapshot): void {
const prev = playbackProgressSnapshot;
if (
Math.abs(prev.currentTime - next.currentTime) < 0.005 &&
Math.abs(prev.progress - next.progress) < 0.0002 &&
Math.abs(prev.buffered - next.buffered) < 0.0002
) {
return;
}
playbackProgressSnapshot = next;
playbackProgressListeners.forEach(cb => cb(next, prev));
}
export function getPlaybackProgressSnapshot(): PlaybackProgressSnapshot {
return playbackProgressSnapshot;
}
export function subscribePlaybackProgress(
cb: (next: PlaybackProgressSnapshot, prev: PlaybackProgressSnapshot) => void,
): () => void {
playbackProgressListeners.add(cb);
return () => {
playbackProgressListeners.delete(cb);
};
}
/** Deferred pause / resume — cleared on stop, new track, manual pause/resume. */
let scheduledPauseTimer: number | null = null;