483 lines
16 KiB
TypeScript
483 lines
16 KiB
TypeScript
import {
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forwardRef,
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memo,
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type RefObject,
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useCallback,
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useEffect,
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useMemo,
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useRef,
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useState,
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} from "react";
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import type { ImageData, LoopMode, ObjectFit } from "../types.ts";
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import { releaseMediaElement } from "../utils";
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interface ImageCarouselProps {
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images: ImageData["images"];
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currentIndex: number;
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isPlaying: boolean;
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segmentProgressRef: RefObject<number>;
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mediaSyncToken: number;
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loopMode: LoopMode;
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hasNextNeighbor: boolean;
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rotation: number;
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objectFit: ObjectFit;
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failedAnimatedMap: Record<string, boolean>;
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onTogglePlay: () => void;
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onAnimatedDuration: (imageId: string, durationMs: number) => void;
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onMediaReady: (imageId: string) => void;
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onAnimatedFailed: (imageId: string) => void;
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onAnimatedProgress: (imageId: string, progress: number) => void;
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onAnimatedEnded: (imageId: string) => void;
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}
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export const ImageCarousel = memo(
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forwardRef<HTMLDivElement, ImageCarouselProps>(
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(
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{
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images,
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currentIndex,
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isPlaying,
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segmentProgressRef,
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mediaSyncToken,
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loopMode,
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hasNextNeighbor,
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rotation,
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objectFit,
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failedAnimatedMap,
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onTogglePlay,
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onAnimatedDuration,
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onMediaReady,
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onAnimatedFailed,
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onAnimatedProgress,
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onAnimatedEnded,
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},
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ref,
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) => {
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const videoRefs = useRef<Map<string, HTMLVideoElement>>(new Map());
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const activeVideoIdRef = useRef<string | null>(null);
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const lastMediaSyncTokenRef = useRef(mediaSyncToken);
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const pendingSeekRef = useRef<{
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imageId: string;
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progress: number;
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} | null>(null);
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const [readyVideoId, setReadyVideoId] = useState<string | null>(null);
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const shouldLoopCurrentVideo =
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loopMode === "single" ||
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(images.length === 1 &&
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(loopMode !== "sequential" || !hasNextNeighbor));
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const seekVideoToProgress = useCallback(
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(videoEl: HTMLVideoElement, progress: number): boolean => {
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const duration = videoEl.duration;
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if (!Number.isFinite(duration) || duration <= 0) return false;
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const clampedProgress = Math.max(0, Math.min(1, progress));
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const maxTime = Math.max(0, duration - 0.05);
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const targetTime = Math.min(maxTime, duration * clampedProgress);
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if (Math.abs(videoEl.currentTime - targetTime) > 0.08) {
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try {
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videoEl.currentTime = targetTime;
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} catch {
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return false;
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}
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}
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return true;
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},
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[],
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);
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const tryPlayVideo = useCallback(
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(videoEl: HTMLVideoElement, imageId: string): void => {
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videoEl.play().catch((err: unknown) => {
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const errorName = err instanceof DOMException ? err.name : "";
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if (
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errorName === "NotAllowedError" ||
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errorName === "NotSupportedError"
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) {
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onAnimatedFailed(imageId);
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}
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});
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},
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[onAnimatedFailed],
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);
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// 虚拟窗口：同时渲染前一张、当前张、后一张静态图以保证切页无白屏，同时仅当前张挂载单个 <video>
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const visibleIndices = useMemo((): number[] => {
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const indices: number[] = [];
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if (currentIndex > 0) indices.push(currentIndex - 1);
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if (currentIndex >= 0 && currentIndex < images.length) {
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indices.push(currentIndex);
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}
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if (currentIndex < images.length - 1) indices.push(currentIndex + 1);
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return indices;
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}, [currentIndex, images.length]);
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// 组件卸载时释放所有残留的 <video> 硬件解码缓冲
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useEffect(() => {
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const map = videoRefs.current;
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return () => {
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map.forEach((videoEl) => {
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releaseMediaElement(videoEl);
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});
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map.clear();
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};
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}, []);
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// 管理当前动图的播放、暂停与切换
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useEffect(() => {
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const currentImage = images[currentIndex];
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const isAnimated =
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Boolean(currentImage?.animated) &&
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!failedAnimatedMap[currentImage?.id ?? ""];
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if (!currentImage || !isAnimated) {
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activeVideoIdRef.current = null;
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videoRefs.current.forEach((videoEl) => {
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videoEl.pause();
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});
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return;
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}
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const videoEl = videoRefs.current.get(currentImage.id);
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videoRefs.current.forEach((itemVideoEl, imageId) => {
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if (imageId !== currentImage.id || !isPlaying) {
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itemVideoEl.pause();
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}
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});
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if (!videoEl) return;
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videoEl.loop = shouldLoopCurrentVideo;
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if (activeVideoIdRef.current !== currentImage.id) {
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activeVideoIdRef.current = currentImage.id;
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const initialProgress = segmentProgressRef.current;
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if (initialProgress > 0.01) {
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const applied = seekVideoToProgress(videoEl, initialProgress);
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if (!applied) {
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pendingSeekRef.current = {
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imageId: currentImage.id,
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progress: initialProgress,
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};
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}
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} else {
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pendingSeekRef.current = null;
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if (videoEl.currentTime > 0.05) {
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try {
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videoEl.currentTime = 0;
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} catch {}
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}
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}
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} else if (
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isPlaying &&
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(videoEl.ended ||
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(Number.isFinite(videoEl.duration) &&
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videoEl.duration > 0 &&
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videoEl.currentTime >= videoEl.duration - 0.05))
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) {
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try {
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videoEl.currentTime = 0;
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} catch {}
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}
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if (isPlaying) {
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tryPlayVideo(videoEl, currentImage.id);
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} else {
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videoEl.pause();
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}
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}, [
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currentIndex,
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failedAnimatedMap,
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images,
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isPlaying,
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seekVideoToProgress,
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segmentProgressRef,
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shouldLoopCurrentVideo,
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tryPlayVideo,
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]);
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// 响应用户主动 Seek 或外部强制同步
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useEffect(() => {
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if (lastMediaSyncTokenRef.current === mediaSyncToken) return;
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lastMediaSyncTokenRef.current = mediaSyncToken;
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const currentImage = images[currentIndex];
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if (!currentImage?.animated || failedAnimatedMap[currentImage.id]) {
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return;
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}
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const targetProgress = segmentProgressRef.current;
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const videoEl = videoRefs.current.get(currentImage.id);
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if (!videoEl) {
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pendingSeekRef.current = {
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imageId: currentImage.id,
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progress: targetProgress,
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};
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return;
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}
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const applied = seekVideoToProgress(videoEl, targetProgress);
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if (applied) {
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pendingSeekRef.current = null;
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} else {
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pendingSeekRef.current = {
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imageId: currentImage.id,
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progress: targetProgress,
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};
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}
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if (isPlaying) {
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tryPlayVideo(videoEl, currentImage.id);
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}
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}, [
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currentIndex,
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failedAnimatedMap,
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images,
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isPlaying,
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mediaSyncToken,
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seekVideoToProgress,
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segmentProgressRef,
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tryPlayVideo,
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]);
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// 使用 rAF 跟踪当前动图真实播放进度，只有动图实际走帧时进度条才前进
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useEffect(() => {
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if (!isPlaying) return;
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const currentImage = images[currentIndex];
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if (!currentImage?.animated || failedAnimatedMap[currentImage.id]) {
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return;
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}
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let rafId: number | null = null;
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const imageId = currentImage.id;
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const updateLoop = (): void => {
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const videoEl = videoRefs.current.get(imageId);
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if (videoEl) {
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const duration = videoEl.duration;
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if (Number.isFinite(duration) && duration > 0 && !videoEl.paused) {
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const progress = Math.max(
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0,
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Math.min(1, videoEl.currentTime / duration),
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);
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onAnimatedProgress(imageId, progress);
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}
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}
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rafId = window.requestAnimationFrame(updateLoop);
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};
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rafId = window.requestAnimationFrame(updateLoop);
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return () => {
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if (rafId !== null) {
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window.cancelAnimationFrame(rafId);
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}
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};
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}, [
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currentIndex,
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failedAnimatedMap,
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images,
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isPlaying,
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onAnimatedProgress,
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]);
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const handleVideoRef = useCallback(
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(el: HTMLVideoElement | null, imageId: string): void => {
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if (el) {
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videoRefs.current.set(imageId, el);
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if (Number.isFinite(el.duration) && el.duration > 0) {
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onAnimatedDuration(imageId, Math.round(el.duration * 1000));
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}
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if (el.readyState >= 2) {
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setReadyVideoId(imageId);
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}
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} else {
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const prevEl = videoRefs.current.get(imageId);
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if (prevEl) {
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releaseMediaElement(prevEl);
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videoRefs.current.delete(imageId);
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}
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setReadyVideoId((current) =>
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current === imageId ? null : current,
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);
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}
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},
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[onAnimatedDuration],
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);
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const handleImgRef = useCallback(
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(el: HTMLImageElement | null, imageId: string): void => {
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if (el?.complete) {
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onMediaReady(imageId);
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}
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},
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[onMediaReady],
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);
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const mediaStyle = useMemo(
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() => ({
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transform:
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rotation % 180 === 0
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? `rotate(${rotation}deg)`
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: `rotate(${rotation}deg) scale(0.85)`,
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objectFit,
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}),
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[objectFit, rotation],
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);
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return (
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<div ref={ref} className="relative h-full w-full overflow-hidden">
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<div className="relative h-full w-full">
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{visibleIndices.map((i) => {
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const img = images[i];
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if (!img) return null;
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const isCurrent = i === currentIndex;
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const canShowAnimated =
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isCurrent &&
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Boolean(img.animated) &&
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!failedAnimatedMap[img.id];
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const animatedSrc = canShowAnimated ? img.animated : null;
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const isVideoVisible = canShowAnimated && readyVideoId === img.id;
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return (
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<div
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key={img.id}
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data-active={isCurrent ? "true" : undefined}
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className="absolute inset-0 h-full w-full flex items-center justify-center bg-black/70 cursor-pointer"
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style={{
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transform: `translateX(${(i - currentIndex) * 100}%)`,
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transition: "transform 240ms ease-out",
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zIndex: isCurrent ? 1 : 0,
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}}
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onClick={onTogglePlay}
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>
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{/* 底层静态图：作为静态页本体及动图首帧就绪前的无缝封面 */}
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<img
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ref={(el) => handleImgRef(el, img.id)}
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src={img.url}
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alt={`image-${i + 1}`}
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loading="eager"
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decoding="async"
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onLoad={() => onMediaReady(img.id)}
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onError={() => onMediaReady(img.id)}
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className={`max-w-full max-h-full transition-opacity duration-150 ${
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isVideoVisible ? "opacity-0" : "opacity-100"
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}`}
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style={{
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width: img.width ? `${img.width}px` : undefined,
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height: img.height ? `${img.height}px` : undefined,
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...mediaStyle,
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}}
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/>
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{/* 仅当前激活页挂载单个 <video>，避免 iOS 多解码器并发卡死 */}
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{animatedSrc ? (
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<video
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ref={(el) => handleVideoRef(el, img.id)}
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src={animatedSrc}
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muted
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playsInline
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loop={shouldLoopCurrentVideo}
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preload="auto"
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controls={false}
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disablePictureInPicture
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className={`absolute max-w-full max-h-full transition-opacity duration-150 ${
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isVideoVisible ? "opacity-100" : "opacity-0"
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}`}
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style={{
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width: img.width ? `${img.width}px` : undefined,
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height: img.height ? `${img.height}px` : undefined,
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...mediaStyle,
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}}
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onLoadedMetadata={(e) => {
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const duration = e.currentTarget.duration;
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if (Number.isFinite(duration) && duration > 0) {
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onAnimatedDuration(
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img.id,
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Math.round(duration * 1000),
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);
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if (
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pendingSeekRef.current &&
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pendingSeekRef.current.imageId === img.id
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) {
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const applied = seekVideoToProgress(
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e.currentTarget,
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pendingSeekRef.current.progress,
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);
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if (applied) {
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pendingSeekRef.current = null;
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}
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}
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}
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}}
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onLoadedData={() => {
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setReadyVideoId(img.id);
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onMediaReady(img.id);
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}}
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onCanPlay={(e) => {
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setReadyVideoId(img.id);
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onMediaReady(img.id);
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if (
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pendingSeekRef.current &&
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pendingSeekRef.current.imageId === img.id
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) {
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const applied = seekVideoToProgress(
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e.currentTarget,
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pendingSeekRef.current.progress,
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);
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if (applied) {
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pendingSeekRef.current = null;
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}
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}
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if (isCurrent && isPlaying && e.currentTarget.paused) {
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tryPlayVideo(e.currentTarget, img.id);
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}
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}}
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onTimeUpdate={(e) => {
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const duration = e.currentTarget.duration;
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if (Number.isFinite(duration) && duration > 0) {
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onAnimatedProgress(
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img.id,
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Math.max(
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0,
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Math.min(
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1,
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e.currentTarget.currentTime / duration,
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),
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),
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);
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}
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}}
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onEnded={(e) => {
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if (shouldLoopCurrentVideo) {
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try {
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e.currentTarget.currentTime = 0;
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} catch {}
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if (isPlaying) {
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tryPlayVideo(e.currentTarget, img.id);
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}
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onAnimatedEnded(img.id);
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return;
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}
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e.currentTarget.pause();
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onAnimatedEnded(img.id);
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}}
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onError={() => {
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onAnimatedFailed(img.id);
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}}
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/>
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) : null}
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</div>
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);
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})}
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</div>
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</div>
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);
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},
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),
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);
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ImageCarousel.displayName = "ImageCarousel";
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