feat: Timeline UI (#2830)

web/src/components/HistoryViewer/HistoryVideo.tsx

@@ -0,0 +1,134 @@
+import { h } from 'preact';
+import { useCallback, useEffect, useRef, useState } from 'preact/hooks';
+import { useApiHost } from '../../api';
+import { isNullOrUndefined } from '../../utils/objectUtils';
+
+interface OnTimeUpdateEvent {
+  timestamp: number;
+  isPlaying: boolean;
+}
+
+interface VideoProperties {
+  posterUrl: string;
+  videoUrl: string;
+  height: number;
+}
+
+interface HistoryVideoProps {
+  id: string;
+  isPlaying: boolean;
+  currentTime: number;
+  onTimeUpdate?: (event: OnTimeUpdateEvent) => void;
+  onPause: () => void;
+  onPlay: () => void;
+}
+
+export const HistoryVideo = ({
+  id,
+  isPlaying: videoIsPlaying,
+  currentTime,
+  onTimeUpdate,
+  onPause,
+  onPlay,
+}: HistoryVideoProps) => {
+  const apiHost = useApiHost();
+  const videoRef = useRef<HTMLVideoElement>();
+  const [videoHeight, setVideoHeight] = useState<number>(undefined);
+  const [videoProperties, setVideoProperties] = useState<VideoProperties>(undefined);
+
+  const currentVideo = videoRef.current;
+  if (currentVideo && !videoHeight) {
+    const currentVideoHeight = currentVideo.offsetHeight;
+    if (currentVideoHeight > 0) {
+      setVideoHeight(currentVideoHeight);
+    }
+  }
+
+  useEffect(() => {
+    const idExists = !isNullOrUndefined(id);
+    if (idExists) {
+      if (videoRef.current && !videoRef.current.paused) {
+        videoRef.current = undefined;
+      }
+
+      setVideoProperties({
+        posterUrl: `${apiHost}/api/events/${id}/snapshot.jpg`,
+        videoUrl: `${apiHost}/vod/event/${id}/index.m3u8`,
+        height: videoHeight,
+      });
+    } else {
+      setVideoProperties(undefined);
+    }
+  }, [id, videoHeight, videoRef, apiHost]);
+
+  useEffect(() => {
+    const playVideo = (video: HTMLMediaElement) => video.play();
+
+    const attemptPlayVideo = (video: HTMLMediaElement) => {
+      const videoHasNotLoaded = video.readyState <= 1;
+      if (videoHasNotLoaded) {
+        video.oncanplay = () => {
+          playVideo(video);
+        };
+        video.load();
+      } else {
+        playVideo(video);
+      }
+    };
+
+    const video = videoRef.current;
+    const videoExists = !isNullOrUndefined(video);
+    if (videoExists) {
+      if (videoIsPlaying) {
+        attemptPlayVideo(video);
+      } else {
+        video.pause();
+      }
+    }
+  }, [videoIsPlaying, videoRef]);
+
+  useEffect(() => {
+    const video = videoRef.current;
+    const videoExists = !isNullOrUndefined(video);
+    const hasSeeked = currentTime >= 0;
+    if (videoExists && hasSeeked) {
+      video.currentTime = currentTime;
+    }
+  }, [currentTime, videoRef]);
+
+  const onTimeUpdateHandler = useCallback(
+    (event: Event) => {
+      const target = event.target as HTMLMediaElement;
+      const timeUpdateEvent = {
+        isPlaying: videoIsPlaying,
+        timestamp: target.currentTime,
+      };
+
+      onTimeUpdate && onTimeUpdate(timeUpdateEvent);
+    },
+    [videoIsPlaying, onTimeUpdate]
+  );
+
+  const videoPropertiesIsUndefined = isNullOrUndefined(videoProperties);
+  if (videoPropertiesIsUndefined) {
+    return <div style={{ height: `${videoHeight}px`, width: '100%' }} />;
+  }
+
+  const { posterUrl, videoUrl, height } = videoProperties;
+  return (
+    <video
+      ref={videoRef}
+      key={posterUrl}
+      onTimeUpdate={onTimeUpdateHandler}
+      onPause={onPause}
+      onPlay={onPlay}
+      poster={posterUrl}
+      preload='metadata'
+      controls
+      style={height ? { minHeight: `${height}px` } : {}}
+      playsInline
+    >
+      <source type='application/vnd.apple.mpegurl' src={videoUrl} />
+    </video>
+  );
+};