201 lines
7.3 KiB
TypeScript
201 lines
7.3 KiB
TypeScript
"use client"
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import { useEffect, useMemo, useRef, useState } from "react"
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import { Maximize2, Minimize2, X } from "lucide-react"
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/**
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* 视觉类节点统一大预览：
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* - **在 ReactFlow 节点 DOM 内**作为 absolute 元素，底边贴当前缩略图上方边缘
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* - 跟随 ReactFlow 画布 pan/zoom 一起变化（属于"无限画布"的一部分）
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* - 默认按原比例 fit 到可视区域，并标注原始分辨率 / 当前缩放比例
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* - pinned 后可切换到 1:1；大图在预览框内滚动查看局部
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* - 不 pinned 时：pointer-events-none，依赖调用方传入 visible
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* - pinned=true：强制 visible，pointer-events 开启，可点 × 关闭
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* - 用法：渲染在节点根层，不要放进 overflow-x-auto 缩略图滚动条里
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*/
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interface Props {
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imgSrc?: string
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videoSrc?: string
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poster?: string
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aspect?: string
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label?: string
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caption?: string
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borderClass?: string
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visible?: boolean
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anchorX?: number
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anchorY?: number
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pinned?: boolean
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onClose?: () => void
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}
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export function HoverPreview({
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imgSrc, videoSrc, poster, aspect,
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label, caption,
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borderClass = "border-violet-300/55",
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visible = false,
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anchorX,
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anchorY,
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pinned = false,
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onClose,
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}: Props) {
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const shown = pinned || visible
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const imgRef = useRef<HTMLImageElement>(null)
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const videoRef = useRef<HTMLVideoElement>(null)
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const [naturalSize, setNaturalSize] = useState<{ width: number; height: number } | null>(null)
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const [actualSize, setActualSize] = useState(false)
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const [viewport, setViewport] = useState({ width: 1200, height: 800 })
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useEffect(() => {
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setNaturalSize(null)
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setActualSize(false)
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}, [imgSrc, videoSrc])
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useEffect(() => {
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if (!pinned) setActualSize(false)
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}, [pinned])
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useEffect(() => {
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const update = () => setViewport({
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width: window.innerWidth || 1200,
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height: window.innerHeight || 800,
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})
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update()
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window.addEventListener("resize", update)
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return () => window.removeEventListener("resize", update)
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}, [])
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useEffect(() => {
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if (!shown) return
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const raf = window.requestAnimationFrame(() => {
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const img = imgRef.current
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if (img?.complete && img.naturalWidth && img.naturalHeight) {
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setNaturalSize({ width: img.naturalWidth, height: img.naturalHeight })
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return
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}
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const video = videoRef.current
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if (video?.videoWidth && video.videoHeight) {
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setNaturalSize({ width: video.videoWidth, height: video.videoHeight })
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}
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})
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return () => window.cancelAnimationFrame(raf)
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}, [imgSrc, shown, videoSrc])
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const fitScale = useMemo(() => {
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if (!naturalSize) return null
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const maxWidth = Math.min(920, viewport.width * 0.7)
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const maxHeight = Math.min(820, viewport.height * 0.72)
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return Math.min(1, maxWidth / naturalSize.width, maxHeight / naturalSize.height)
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}, [naturalSize, viewport.height, viewport.width])
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const metadataText = naturalSize
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? `原始 ${naturalSize.width}×${naturalSize.height} · ${actualSize ? "1:1" : `Fit ${Math.round((fitScale ?? 1) * 100)}%`}`
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: actualSize ? "1:1" : "Fit"
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const visibilityCls = shown
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? pinned ? "opacity-100 pointer-events-auto" : "opacity-100 pointer-events-none"
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: "pointer-events-none opacity-0"
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const previewFrameStyle = actualSize
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? {
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width: "max-content",
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maxWidth: "min(78vw, 1040px)",
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maxHeight: "min(76vh, 860px)",
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overflow: "auto",
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}
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: {
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width: "max-content",
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maxWidth: "min(70vw, 920px)",
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maxHeight: "min(72vh, 820px)",
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overflow: "hidden",
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}
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const mediaStyle = actualSize
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? { width: "auto", height: "auto", maxWidth: "none", maxHeight: "none" }
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: { width: "auto", height: "auto", maxWidth: "min(70vw, 920px)", maxHeight: "min(72vh, 820px)" }
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return (
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<div
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className={`absolute transition-all duration-150 z-[120] ${visibilityCls}`}
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style={{
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top: typeof anchorY === "number" ? `${anchorY - 8}px` : undefined,
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bottom: typeof anchorY === "number" ? undefined : "calc(100% + 8px)",
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left: typeof anchorX === "number" ? `${anchorX}px` : "50%",
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transform: `${typeof anchorY === "number" ? "translate(-50%, -100%)" : "translateX(-50%)"} scale(${shown ? 1 : 0.96})`,
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transformOrigin: "bottom center",
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}}
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>
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<div className={`relative rounded-lg overflow-hidden border-2 bg-black shadow-2xl ${pinned ? "ring-2 ring-violet-400/70" : ""} ${borderClass}`}
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style={previewFrameStyle}>
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{shown && (
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<div className="absolute left-1.5 top-1.5 z-10 rounded-md bg-black/75 px-2 py-1 text-[10px] font-mono leading-none text-white shadow-lg backdrop-blur">
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{metadataText}
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</div>
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)}
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{videoSrc ? (
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<video
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ref={videoRef}
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src={videoSrc}
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poster={poster}
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muted
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loop
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playsInline
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autoPlay
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preload="auto"
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className="block"
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style={mediaStyle}
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onLoadedMetadata={(e) => {
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const video = e.currentTarget
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if (video.videoWidth && video.videoHeight) {
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setNaturalSize({ width: video.videoWidth, height: video.videoHeight })
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}
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video.play().catch(() => {})
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}}
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onCanPlay={(e) => { e.currentTarget.play().catch(() => {}) }}
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/>
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) : imgSrc ? (
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<img
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ref={imgRef}
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src={imgSrc}
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alt=""
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className="block"
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style={mediaStyle}
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onLoad={(e) => {
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const img = e.currentTarget
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if (img.naturalWidth && img.naturalHeight) {
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setNaturalSize({ width: img.naturalWidth, height: img.naturalHeight })
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}
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}}
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/>
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) : (
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<div className="w-40 bg-black/40" style={{ aspectRatio: aspect ?? "1/1" }} />
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)}
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{(label || caption) && (
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<div className="px-2 py-1 bg-black/80 text-white text-[11px] flex items-center justify-between">
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{label && <span>{label}</span>}
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{caption && <span className="text-white/60 font-mono">{caption}</span>}
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</div>
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)}
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{pinned && onClose && (
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<div className="absolute right-1 top-1 z-10 flex items-center gap-1">
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<button
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type="button"
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onClick={(e) => { e.stopPropagation(); setActualSize((x) => !x) }}
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onMouseDown={(e) => e.stopPropagation()}
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title={actualSize ? "适应预览" : "1:1 查看"}
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className="inline-flex h-7 w-7 items-center justify-center rounded-full bg-black/75 text-white shadow-lg backdrop-blur hover:bg-violet-500"
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>
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{actualSize ? <Minimize2 className="h-4 w-4" /> : <Maximize2 className="h-4 w-4" />}
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</button>
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<button
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type="button"
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onClick={(e) => { e.stopPropagation(); onClose() }}
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onMouseDown={(e) => e.stopPropagation()}
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title="取消固定预览"
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className="inline-flex h-7 w-7 items-center justify-center rounded-full bg-black/75 text-white shadow-lg backdrop-blur hover:bg-rose-500"
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>
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<X className="h-4 w-4" />
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</button>
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</div>
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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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