133 lines
3.5 KiB
TypeScript
133 lines
3.5 KiB
TypeScript
import { useEffect, useRef, useState } from "react";
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import type { RefObject } from "react";
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import { useRouter } from "next/navigation";
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import type { ImageData, LoopMode, Neighbors } from "../types.ts";
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interface UseImageCarouselProps {
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images: ImageData["images"];
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isPlaying: boolean;
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loopMode: LoopMode;
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neighbors: Neighbors;
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volume: number;
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audioRef: RefObject<HTMLAudioElement | null>;
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scrollerRef: RefObject<HTMLDivElement | null>;
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setProgress: (progress: number) => void;
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/** 单张图片显示时长（毫秒），默认 5000ms */
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segmentMs?: number;
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}
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export function useImageCarousel({
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images,
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isPlaying,
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loopMode,
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neighbors,
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volume,
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audioRef,
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scrollerRef,
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setProgress,
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segmentMs = 5000,
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}: UseImageCarouselProps) {
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const router = useRouter();
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const [idx, setIdx] = useState(0);
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const [segProgress, setSegProgress] = useState(0);
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const segStartRef = useRef<number | null>(null);
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const idxRef = useRef<number>(0);
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const rafRef = useRef<number | null>(null);
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useEffect(() => {
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idxRef.current = idx;
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}, [idx]);
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// BGM 控制
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useEffect(() => {
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const el = audioRef.current;
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if (!el) return;
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el.volume = volume;
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if (isPlaying) {
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el.play().catch(() => {});
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} else {
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el.pause();
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}
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}, [audioRef, isPlaying, volume]);
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// 自动切页
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useEffect(() => {
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if (!images?.length) return;
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if (segStartRef.current == null) segStartRef.current = performance.now();
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let lastTs = performance.now();
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const tick = (ts: number) => {
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if (!images?.length) return;
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if (!isPlaying) segStartRef.current! += ts - lastTs;
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lastTs = ts;
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let start = segStartRef.current!;
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let localIdx = idxRef.current;
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let elapsed = ts - start;
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// 获取当前图片的显示时长（动图使用其 duration，静态图片使用 segmentMs）
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const getCurrentSegmentDuration = (index: number) => {
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const img = images[index];
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return img?.duration ?? segmentMs;
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};
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let currentSegmentDuration = getCurrentSegmentDuration(localIdx);
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while (elapsed >= currentSegmentDuration) {
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elapsed -= currentSegmentDuration;
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if (localIdx >= images.length - 1) {
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if (loopMode === "sequential" && neighbors?.next) {
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router.push(`/aweme/${neighbors.next.aweme_id}`);
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return;
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}
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localIdx = 0;
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} else {
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localIdx = localIdx + 1;
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}
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// 更新下一张图片的时长
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currentSegmentDuration = getCurrentSegmentDuration(localIdx);
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}
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segStartRef.current = ts - elapsed;
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if (localIdx !== idxRef.current) {
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idxRef.current = localIdx;
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setIdx(localIdx);
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// 虚拟滚动不需要实际滚动 DOM
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}
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const localSeg = Math.max(0, Math.min(1, elapsed / currentSegmentDuration));
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setSegProgress(localSeg);
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// 计算总进度：已完成的图片 + 当前图片的进度
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let totalProgress = 0;
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for (let i = 0; i < localIdx; i++) {
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totalProgress += 1;
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}
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totalProgress += localSeg;
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setProgress(totalProgress / images.length);
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rafRef.current = requestAnimationFrame(tick);
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};
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rafRef.current = requestAnimationFrame(tick);
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return () => {
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if (rafRef.current) cancelAnimationFrame(rafRef.current);
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rafRef.current = null;
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};
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}, [images, isPlaying, loopMode, neighbors?.next, router, scrollerRef, setProgress, segmentMs]);
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return {
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idx,
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setIdx,
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segProgress,
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segStartRef,
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idxRef,
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};
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}
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