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image.tsx
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image.tsx
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import React, { useCallback, useState } from 'react'
import { useInView } from 'react-intersection-observer'
type State = {
lazyLoad: boolean
isSsr: boolean
isIntersectionObserverAvailable: boolean
inView?: boolean
loaded: boolean
}
const imageAddStrategy = ({
lazyLoad,
isSsr,
isIntersectionObserverAvailable,
inView,
loaded,
}: State) => {
if (!lazyLoad) {
return true
}
if (isSsr) {
return false
}
if (isIntersectionObserverAvailable) {
return inView || loaded
}
return true
}
const imageShowStrategy = ({
lazyLoad,
isSsr,
isIntersectionObserverAvailable,
loaded,
}: State) => {
if (!lazyLoad) {
return true
}
if (isSsr) {
return false
}
if (isIntersectionObserverAvailable) {
return loaded
}
return true
}
type ImageData = {
aspectRatio: number
base64?: string
height?: number
width: number
sizes?: string
src?: string
srcSet?: string
webpSrcSet?: string
bgColor?: string
alt?: string
title?: string
}
type ImageProps = {
data: ImageData
className?: string
pictureClassName?: string
fadeInDuration?: number
intersectionTreshold?: number
intersectionThreshold?: number
intersectionMargin?: string
lazyLoad?: boolean
style?: React.CSSProperties
pictureStyle?: React.CSSProperties
explicitWidth?: boolean
}
const Image = function ({
className,
fadeInDuration,
intersectionTreshold,
intersectionMargin,
pictureClassName,
lazyLoad = true,
style,
pictureStyle,
explicitWidth,
data,
}: ImageProps) {
const [loaded, setLoaded] = useState(false)
const handleLoad = useCallback(() => {
setLoaded(true)
}, [])
const [ref, inView] = useInView({
threshold: intersectionTreshold || 0,
rootMargin: intersectionMargin || '0px 0px 0px 0px',
triggerOnce: true,
})
const isSsr = typeof window === 'undefined'
const isIntersectionObserverAvailable = isSsr
? false
: !!window.IntersectionObserver
const absolutePositioning: React.CSSProperties = {
position: 'absolute',
left: 0,
top: 0,
bottom: 0,
right: 0,
}
const addImage = imageAddStrategy({
lazyLoad,
isSsr,
isIntersectionObserverAvailable,
inView,
loaded,
})
const showImage = imageShowStrategy({
lazyLoad,
isSsr,
isIntersectionObserverAvailable,
inView,
loaded,
})
const webpSource = data.webpSrcSet && (
<source srcSet={data.webpSrcSet} sizes={data.sizes} type="image/webp" />
)
const regularSource = data.srcSet && (
<source srcSet={data.srcSet} sizes={data.sizes} />
)
const placeholder = (
<div
style={{
backgroundImage: data.base64 ? `url(${data.base64})` : null,
backgroundColor: data.bgColor,
backgroundSize: 'cover',
opacity: showImage ? 0 : 1,
transition:
!fadeInDuration || fadeInDuration > 0
? `opacity ${fadeInDuration || 500}ms ${fadeInDuration || 500}ms`
: null,
...absolutePositioning,
}}
/>
)
const { width, aspectRatio } = data
const height = data.height || width / aspectRatio
const sizer = (
<svg
className={pictureClassName}
style={{
width: explicitWidth ? `${width}px` : '100%',
height: 'auto',
display: 'block',
...pictureStyle,
}}
height={height}
width={width}
/>
)
return (
<div
ref={ref}
className={className}
style={{
display: 'inline-block',
overflow: 'hidden',
...style,
position: 'relative',
}}
>
{sizer}
{placeholder}
{addImage && (
<picture
style={{
...absolutePositioning,
opacity: showImage ? 1 : 0,
transition:
!fadeInDuration || fadeInDuration > 0
? `opacity ${fadeInDuration || 500}ms`
: null,
}}
>
{webpSource}
{regularSource}
{data.src && (
<img
src={data.src}
alt={data.alt}
title={data.title}
onLoad={handleLoad}
style={{ width: '100%' }}
/>
)}
</picture>
)}
<noscript>
<picture className={pictureClassName} style={{ ...pictureStyle }}>
{webpSource}
{regularSource}
{data.src && <img src={data.src} alt={data.alt} title={data.title} />}
</picture>
</noscript>
</div>
)
}
export default Image