feat: enable picture-in-picture when video is scrolled out of view (#258)

Co-authored-by: Wutche <wuthchechikaome75@gmail.com>

src/components/VideoPlayer/index.tsx

@@ -1,5 +1,7 @@
 import { cn } from '@/lib/utils'
 import NsfwOverlay from '../NsfwOverlay'
+import { useEffect, useRef } from 'react'
+import VideoManager from '@/services/videomanager'
 
 export default function VideoPlayer({
   src,
@@ -12,15 +14,63 @@ export default function VideoPlayer({
   isNsfw?: boolean
   size?: 'normal' | 'small'
 }) {
+  const videoRef = useRef<HTMLVideoElement>(null)
+  const containerRef = useRef<HTMLDivElement>(null)
+
+  useEffect(() => {
+    const video = videoRef.current
+    const container = containerRef.current
+
+    if (!video || !container) return
+
+    const observer = new IntersectionObserver(
+      async ([entry]) => {
+        const isVisible = entry.isIntersecting
+
+        if (!isVisible && !video.paused) {
+          await VideoManager.enterPiP(video)
+        }
+
+        if (isVisible) {
+          if (
+            document.pictureInPictureElement === video ||
+            (video as any).webkitPresentationMode === 'picture-in-picture'
+          ) {
+            await VideoManager.exitPiP(video)
+          }
+        }
+      },
+      {
+        threshold: 0.5
+      }
+    )
+
+    observer.observe(container)
+
+    return () => {
+      observer.unobserve(container)
+    }
+  }, [])
+
+  const handlePlay = async () => {
+    const video = videoRef.current
+    if (!video) return
+
+    await VideoManager.playVideo(video)
+  }
   return (
-    <div className="relative">
+    <>
+      <div ref={containerRef} className="relative">
         <video
+          ref={videoRef}
           controls
           className={cn('rounded-lg', size === 'small' ? 'h-[15vh]' : 'h-[30vh]', className)}
           src={src}
           onClick={(e) => e.stopPropagation()}
+          onPlay={handlePlay}
         />
         {isNsfw && <NsfwOverlay className="rounded-lg" />}
       </div>
+    </>
   )
 }

src/services/videomanager.ts

@@ -0,0 +1,38 @@
+class VideoManager {
+  private static currentVideo: HTMLVideoElement | null = null
+
+  static async enterPiP(video: HTMLVideoElement) {
+    if (VideoManager.currentVideo && VideoManager.currentVideo !== video) {
+      await VideoManager.exitPiP(VideoManager.currentVideo)
+    }
+
+    if ('requestPictureInPicture' in video) {
+      await video.requestPictureInPicture()
+    } else if ('webkitSetPresentationMode' in video) {
+      ;(video as any).webkitSetPresentationMode('picture-in-picture')
+    }
+  }
+
+  static async exitPiP(video: HTMLVideoElement) {
+    video.pause()
+    if (document.pictureInPictureElement === video) {
+      await document.exitPictureInPicture()
+    } else if ('webkitSetPresentationMode' in video) {
+      ;(video as any).webkitSetPresentationMode('inline')
+    }
+
+    if (VideoManager.currentVideo === video) {
+      VideoManager.currentVideo = null
+    }
+  }
+
+  static async playVideo(video: HTMLVideoElement) {
+    if (VideoManager.currentVideo && VideoManager.currentVideo !== video) {
+      await VideoManager.exitPiP(VideoManager.currentVideo)
+    }
+    VideoManager.currentVideo = video
+    video.play()
+  }
+}
+
+export default VideoManager