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perf(frontend): タブがバックグラウンドな間のsetIntervalを停止するように #17769
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syuilo
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misskey-dev:develop
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kakkokari-gtyih:perf-visibility-setinterval
Jul 22, 2026
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| /* | ||
| * SPDX-FileCopyrightText: syuilo and misskey-project | ||
| * SPDX-License-Identifier: AGPL-3.0-only | ||
| */ | ||
|
|
||
| /** ドキュメントがアクティブになっていない間は実行を止めるsetInterval。戻り値の関数でdisposeする */ | ||
| export function createVisibilityAwareInterval(fn: () => void, interval: number, options: { | ||
| immediate?: boolean; | ||
| } = {}): () => void { | ||
| let intervalId: number | null = null; | ||
| let lastCalledAt: number | null = null; | ||
|
|
||
| const tick = () => { | ||
| lastCalledAt = Date.now(); | ||
| fn(); | ||
| }; | ||
|
|
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| const start = () => { | ||
| if (intervalId != null) return; | ||
| if (lastCalledAt == null) { | ||
| if (options.immediate) { | ||
| tick(); | ||
| } else { | ||
| lastCalledAt = Date.now(); | ||
| } | ||
| } else if (Date.now() - lastCalledAt >= interval) { | ||
| // もし前回の呼び出しからinterval以上の時間が経過していたら、即座に呼び出す | ||
| // (非アクティブ→アクティブに戻った場合など) | ||
| tick(); | ||
| } | ||
| intervalId = window.setInterval(tick, interval); | ||
| }; | ||
|
|
||
| const stop = () => { | ||
| if (intervalId != null) { | ||
| window.clearInterval(intervalId); | ||
| intervalId = null; | ||
| } | ||
| }; | ||
|
|
||
| const onVisibilityChange = () => { | ||
| if (window.document.visibilityState === 'visible') { | ||
| start(); | ||
| } else { | ||
| stop(); | ||
| } | ||
| }; | ||
|
|
||
| window.document.addEventListener('visibilitychange', onVisibilityChange); | ||
|
|
||
| if (window.document.visibilityState === 'visible') { | ||
| start(); | ||
| } | ||
|
|
||
| return () => { | ||
| window.document.removeEventListener('visibilitychange', onVisibilityChange); | ||
| stop(); | ||
| }; | ||
| } |
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