33 lines
1.1 KiB
TypeScript
33 lines
1.1 KiB
TypeScript
import { useEffect, useRef } from "react";
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import { createLocalStats, type StatsStore } from "./readingStats";
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const TICK = 30; // 秒：可见期间心跳粒度
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/** Reader 页挂一次：可见期间每 30s 落一笔，隐藏/卸载即 flush。 */
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export function useReadingSession(store: StatsStore = createLocalStats()) {
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const acc = useRef(0);
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const last = useRef(0);
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useEffect(() => {
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last.current = Date.now(); // 渲染期不取时钟，effect 内初始化起算点
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const flush = () => {
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const now = Date.now();
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if (document.visibilityState === "visible") acc.current += (now - last.current) / 1000;
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last.current = now;
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if (acc.current >= 1) {
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store.record(acc.current);
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acc.current = 0;
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}
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};
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const t = setInterval(flush, TICK * 1000);
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const onVis = () => flush();
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document.addEventListener("visibilitychange", onVis);
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globalThis.addEventListener?.("pagehide", onVis);
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return () => {
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clearInterval(t);
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document.removeEventListener("visibilitychange", onVis);
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globalThis.removeEventListener?.("pagehide", onVis);
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flush();
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};
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}, [store]);
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}
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