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carbon/components/RandomImage.js

94 lines
2.5 KiB
JavaScript

import React from 'react'
import Spinner from 'react-spinner'
import { useAsyncCallback } from 'actionsack'
import { useAPI } from './ApiContext'
import PhotoCredit from './PhotoCredit'
function RandomImage(props) {
const cacheRef = React.useRef([])
const [cacheIndex, updateIndex] = React.useState(0)
const api = useAPI()
const [selectImage, { loading: selecting }] = useAsyncCallback(() => {
const image = cacheRef.current[cacheIndex]
return api.unsplash.download(image.id).then(data => props.onChange({ ...image, ...data }))
})
const [updateCache, { loading: updating, error, data: imgs }] = useAsyncCallback(
api.unsplash.random
)
const needsFetch = !error && !updating && (!imgs || cacheIndex > cacheRef.current.length - 2)
React.useEffect(() => {
if (needsFetch) {
updateCache()
}
}, [needsFetch, updateCache])
React.useEffect(() => {
if (imgs) {
cacheRef.current.push(...imgs)
}
}, [imgs])
const loading = updating || selecting
const cache = cacheRef.current
const photographer = cache[cacheIndex] && cache[cacheIndex].photographer
const bgImage = cache[cacheIndex] && cache[cacheIndex].dataURL
return (
<div className="random-image-container">
<div className="controls">
<button disabled={loading} onClick={selectImage}>
Use Image
</button>
<button disabled={loading} onClick={() => updateIndex(i => i + 1)}>
Try Another
</button>
</div>
<div className="image">{loading && <Spinner />}</div>
{photographer && <PhotoCredit photographer={photographer} />}
<style jsx>
{`
.image {
width: 100%;
height: 140px;
background: url(${bgImage});
background-size: cover;
background-repeat: no-repeat;
margin-bottom: 4px;
}
.controls {
display: flex;
justify-content: space-between;
margin-bottom: 4px;
}
button {
opacity: ${loading ? 0.5 : 1};
cursor: ${loading ? 'not-allowed' : 'pointer'};
user-select: none;
appearance: none;
border: none;
background: none;
color: inherit;
font-size: inherit;
padding: 0;
}
button:focus {
outline: none;
text-decoration: underline;
}
`}
</style>
</div>
)
}
export default RandomImage