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refactor(web): responsive images on content size, throttle AutoUpdati…
…ngCameraImage
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,20 +1,29 @@ | ||
| import { h } from 'preact'; | ||
| import CameraImage from './CameraImage'; | ||
| import { ApiHost, Config } from '../context'; | ||
| import { useCallback, useEffect, useContext, useState } from 'preact/hooks'; | ||
| import { useCallback, useState } from 'preact/hooks'; | ||
|
|
||
| export default function AutoUpdatingCameraImage({ camera, searchParams }) { | ||
| const apiHost = useContext(ApiHost); | ||
| const MIN_LOAD_TIMEOUT_MS = 200; | ||
|
|
||
| export default function AutoUpdatingCameraImage({ camera, searchParams, showFps = true }) { | ||
| const [key, setKey] = useState(Date.now()); | ||
| useEffect(() => { | ||
| const timeoutId = setTimeout(() => { | ||
| setKey(Date.now()); | ||
| }, 500); | ||
| return () => { | ||
| clearTimeout(timeoutId); | ||
| }; | ||
| }, [key, searchParams]); | ||
| const [fps, setFps] = useState(0); | ||
|
|
||
| return <CameraImage camera={camera} searchParams={`cache=${key}&${searchParams}`} />; | ||
| const handleLoad = useCallback(() => { | ||
| const loadTime = Date.now() - key; | ||
| setFps((1000 / Math.max(loadTime, MIN_LOAD_TIMEOUT_MS)).toFixed(1)); | ||
| setTimeout( | ||
| () => { | ||
| setKey(Date.now()); | ||
| }, | ||
| loadTime > MIN_LOAD_TIMEOUT_MS ? 1 : MIN_LOAD_TIMEOUT_MS | ||
| ); | ||
| }, [key, searchParams, setFps]); | ||
|
|
||
| return ( | ||
| <div> | ||
| <CameraImage camera={camera} onload={handleLoad} searchParams={`cache=${key}&${searchParams}`} /> | ||
| {showFps ? <span className="text-xs">Displaying at {fps}fps</span> : null} | ||
| </div> | ||
| ); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,38 +1,60 @@ | ||
| import { h } from 'preact'; | ||
| import { ApiHost, Config } from '../context'; | ||
| import { useCallback, useEffect, useContext, useState } from 'preact/hooks'; | ||
| import { useCallback, useEffect, useContext, useMemo, useRef, useState } from 'preact/hooks'; | ||
|
|
||
| export default function CameraImage({ camera, searchParams = '', imageRef }) { | ||
| export default function CameraImage({ camera, onload, searchParams = '' }) { | ||
| const config = useContext(Config); | ||
| const apiHost = useContext(ApiHost); | ||
| const { name, width, height } = config.cameras[camera]; | ||
| const [availableWidth, setAvailableWidth] = useState(0); | ||
| const [loadedSrc, setLoadedSrc] = useState(null); | ||
| const containerRef = useRef(null); | ||
|
|
||
| const { name, width, height } = config.cameras[camera]; | ||
| const aspectRatio = width / height; | ||
| const innerWidth = parseInt(window.innerWidth, 10); | ||
|
|
||
| const responsiveWidths = [640, 768, 1024, 1280]; | ||
| if (innerWidth > responsiveWidths[responsiveWidths.length - 1]) { | ||
| responsiveWidths.push(innerWidth); | ||
| } | ||
|
|
||
| const src = `${apiHost}/api/${camera}/latest.jpg`; | ||
| const { srcset, sizes } = responsiveWidths.reduce( | ||
| (memo, w, i) => { | ||
| memo.srcset.push(`${src}?h=${Math.ceil(w / aspectRatio)}&${searchParams} ${w}w`); | ||
| memo.sizes.push(`(max-width: ${w}) ${Math.ceil((w / innerWidth) * 100)}vw`); | ||
| return memo; | ||
|
|
||
| const resizeObserver = useMemo(() => { | ||
| return new ResizeObserver((entries) => { | ||
| window.requestAnimationFrame(() => { | ||
| if (Array.isArray(entries) && entries.length) { | ||
| setAvailableWidth(entries[0].contentRect.width); | ||
| } | ||
| }); | ||
| }); | ||
| }, [setAvailableWidth, width]); | ||
|
|
||
| useEffect(() => { | ||
| if (!containerRef.current) { | ||
| return; | ||
| } | ||
| resizeObserver.observe(containerRef.current); | ||
| }, [resizeObserver, containerRef.current]); | ||
|
|
||
| const scaledHeight = useMemo(() => Math.min(Math.ceil(availableWidth / aspectRatio), height), [ | ||
| availableWidth, | ||
| aspectRatio, | ||
| height, | ||
| ]); | ||
|
|
||
| const img = useMemo(() => new Image(), [camera]); | ||
| img.onload = useCallback( | ||
| (event) => { | ||
| const src = event.path[0].currentSrc; | ||
| setLoadedSrc(src); | ||
| onload && onload(event); | ||
| }, | ||
| { srcset: [], sizes: [] } | ||
| [searchParams, onload] | ||
| ); | ||
|
|
||
| useEffect(() => { | ||
| if (!scaledHeight) { | ||
| return; | ||
| } | ||
| img.src = `${apiHost}/api/${name}/latest.jpg?h=${scaledHeight}${searchParams ? `&${searchParams}` : ''}`; | ||
| }, [apiHost, name, img, searchParams, scaledHeight]); | ||
|
|
||
| return ( | ||
| <img | ||
| className="w-full" | ||
| srcset={srcset.join(', ')} | ||
| sizes={sizes.join(', ')} | ||
| src={`${srcset[srcset.length - 1]}`} | ||
| alt={name} | ||
| ref={imageRef} | ||
| /> | ||
| <div ref={containerRef}> | ||
| {loadedSrc ? <img width={scaledHeight * aspectRatio} height={scaledHeight} src={loadedSrc} alt={name} /> : null} | ||
| </div> | ||
| ); | ||
| } |