196 lines
7.7 KiB
TypeScript
196 lines
7.7 KiB
TypeScript
"use client";
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import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
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import Link from 'next/link';
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import HoverVideo from './HoverVideo';
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import { ThumbsUp } from 'lucide-react';
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import type { FeedItem, FeedResponse } from '@/app/types/feed';
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type Props = {
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initialItems: FeedItem[];
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initialCursor: string | null;
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};
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export default function FeedMasonry({ initialItems, initialCursor }: Props) {
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// 哨兵与容器
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const [cursor, setCursor] = useState<string | null>(initialCursor);
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const [loading, setLoading] = useState(false);
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const [ended, setEnded] = useState(!initialCursor);
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const sentinelRef = useRef<HTMLDivElement | null>(null);
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const containerRef = useRef<HTMLDivElement | null>(null);
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// 响应式列数：<640:1, >=640:2, >=1024:3, >=1280:4
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const getColumnCount = useCallback(() => {
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if (typeof window === 'undefined') return 1;
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const w = window.innerWidth;
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if (w >= 1280) return 4; // xl
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if (w >= 1024) return 3; // lg
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if (w >= 640) return 2; // sm
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return 1;
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}, []);
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const [columnCount, setColumnCount] = useState<number>(getColumnCount());
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useEffect(() => {
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const onResize = () => setColumnCount(getColumnCount());
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window.addEventListener('resize', onResize);
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return () => window.removeEventListener('resize', onResize);
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}, [getColumnCount]);
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// 估算卡片高度（用于分配到“最短列”）
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const estimateItemHeight = useCallback((item: FeedItem, colWidth: number) => {
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// 媒体区域高度
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let mediaH = 200; // fallback
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if (item.width && item.height) {
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mediaH = Math.max(80, (Number(item.height) / Number(item.width)) * colWidth);
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} else if (item.type === 'video') {
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mediaH = (9 / 16) * colWidth; // 常见视频比例
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}
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// 文本 + 作者栏的高度粗估
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const textH = 48; // 标题+标签区域
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const authorH = 48; // 作者行
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const gap = 16; // 卡片内边距/间隙
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return mediaH + textH + authorH + gap;
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}, []);
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// 维护列数据与列高
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const [columns, setColumns] = useState<FeedItem[][]>(() => {
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const cols: FeedItem[][] = Array.from({ length: columnCount }, () => []);
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return cols;
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});
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const [colHeights, setColHeights] = useState<number[]>(() => Array.from({ length: columnCount }, () => 0));
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// 初始化与当列数变化时重排
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useEffect(() => {
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const containerWidth = containerRef.current?.clientWidth ?? 0;
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const colWidth = columnCount > 0 ? containerWidth / columnCount : containerWidth;
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// 用 initialItems 重排
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const newCols: FeedItem[][] = Array.from({ length: columnCount }, () => []);
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const newHeights: number[] = Array.from({ length: columnCount }, () => 0);
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for (const item of initialItems) {
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// 找最短列
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let minIdx = 0;
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for (let i = 1; i < columnCount; i++) {
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if (newHeights[i] < newHeights[minIdx]) minIdx = i;
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}
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newCols[minIdx].push(item);
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newHeights[minIdx] += estimateItemHeight(item, colWidth || 300);
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}
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setColumns(newCols);
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setColHeights(newHeights);
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// eslint-disable-next-line react-hooks/exhaustive-deps
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}, [columnCount]);
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const fetchMore = useCallback(async () => {
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if (loading || ended) return;
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setLoading(true);
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try {
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const params = new URLSearchParams();
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if (cursor) params.set('before', cursor);
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params.set('limit', '24');
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const res = await fetch(`/api/feed?${params.toString()}`, { cache: 'no-store' });
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if (!res.ok) throw new Error(`HTTP ${res.status}`);
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const data: FeedResponse = await res.json();
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// 将新数据按最短列分配
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setColumns((prevCols) => {
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const containerWidth = containerRef.current?.clientWidth ?? 0;
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const colWidth = columnCount > 0 ? containerWidth / columnCount : containerWidth;
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const cols = prevCols.map((c) => [...c]);
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const heights = [...colHeights];
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for (const item of data.items) {
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// 找当前最短列
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let minIdx = 0;
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for (let i = 1; i < columnCount; i++) {
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if (heights[i] < heights[minIdx]) minIdx = i;
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}
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cols[minIdx].push(item);
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heights[minIdx] += estimateItemHeight(item, colWidth || 300);
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}
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setColHeights(heights);
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return cols;
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});
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setCursor(data.nextCursor);
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if (!data.nextCursor || data.items.length === 0) setEnded(true);
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} catch (e) {
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console.error('fetch more feed failed', e);
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// 失败也不要死循环
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setEnded(true);
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} finally {
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setLoading(false);
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}
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}, [cursor, ended, loading, columnCount, colHeights, estimateItemHeight]);
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useEffect(() => {
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const el = sentinelRef.current;
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if (!el) return;
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const io = new IntersectionObserver((entries) => {
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const entry = entries[0];
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if (entry.isIntersecting) {
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fetchMore();
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}
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}, { rootMargin: '800px 0px 800px 0px' });
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io.observe(el);
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return () => io.disconnect();
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}, [fetchMore]);
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const renderCard = useCallback((item: FeedItem) => (
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<Link key={item.aweme_id} href={`/aweme/${item.aweme_id}`} className="mb-4 block group">
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<article className="relative overflow-hidden rounded-2xl shadow-sm ring-1 ring-black/5 bg-white/80 dark:bg-zinc-900/60 backdrop-blur-sm transition-transform duration-300 group-hover:-translate-y-1">
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<div
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className="relative w-full"
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style={{ aspectRatio: `${(item.width && item.height) ? `${item.width}/${item.height}` : ''}` as any }}
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>
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{item.type === 'video' ? (
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<HoverVideo
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videoUrl={(item as any).video_url}
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coverUrl={item.cover_url}
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className="absolute inset-0 w-full h-full"
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/>
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) : (
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<img
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loading="lazy"
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src={item.cover_url || '/placeholder.svg'}
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alt={item.desc?.slice(0, 20) || 'image'}
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className="absolute inset-0 w-full h-full object-cover"
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/>
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)}
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<div className="pointer-events-none absolute inset-0 bg-gradient-to-t from-black/50 via-black/0 to-black/0 opacity-70" />
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<div className="absolute left-3 bottom-3 right-3 flex items-end justify-between gap-3">
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<p className="text-white/95 text-sm leading-tight line-clamp-2 drop-shadow">
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{item.desc}
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</p>
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<span className="shrink-0 inline-flex items-center gap-2 rounded-full bg-white/85 px-2 py-1 text-xs text-zinc-800">
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{item.type === 'video' ? '视频' : '图文'}
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</span>
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</div>
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</div>
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<div className="flex items-center gap-2 p-3">
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<div className="size-6 rounded-full overflow-hidden bg-zinc-200">
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{item.author.avatar_url ? (
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<img src={item.author.avatar_url} alt="avatar" className="w-full h-full object-cover" />
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) : null}
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</div>
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<span className="text-sm text-zinc-700 dark:text-zinc-300 truncate">{item.author.nickname}</span>
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<span className="ml-auto text-sm text-zinc-700 dark:text-zinc-300">{item.likes} </span><ThumbsUp size={16} style={{ color: 'var(--color-zinc-700)' }} />
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</div>
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</article>
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</Link>
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), []);
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return (
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<>
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{/* Masonry（按列渲染，动态分配到最短列） */}
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<div ref={containerRef} className="grid gap-4" style={{ gridTemplateColumns: `repeat(${columnCount}, minmax(0, 1fr))` }}>
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{columns.map((col, idx) => (
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<div key={idx} className="flex flex-col">
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{col.map((item) => renderCard(item))}
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</div>
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))}
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</div>
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<div ref={sentinelRef} className="h-10 flex items-center justify-center text-sm text-zinc-500">
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{ended ? '没有更多了' : (loading ? '加载中…' : '下拉加载更多')}
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</div>
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</>
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);
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}
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