pinafore/routes/_components/LazyImage.html

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<div class="lazy-image {fillFixSize ? 'fixed-size': ''}" style={computedStyle} >
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<img
aria-hidden={ariaHidden}
{alt}
{title}
{width}
{height}
src={displaySrc}
style={focusStyle}
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ref:node
/>
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</div>
<style>
.lazy-image {
margin: 0;
padding: 0;
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overflow: hidden;
display: flex;
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}
.fixed-size img {
width: 100%;
height: 100%;
}
.fixed-size {
position: absolute;
width: 100%;
height: 100%;
}
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</style>
<script>
import { decodeImage } from '../_utils/decodeImage'
const coordsToPercent = coord => (1 + coord) / 2 * 100
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export default {
async oncreate () {
try {
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await decodeImage(this.refs.node)
} catch (e) {
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this.set({ error: true })
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}
},
data: () => ({
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error: false,
forceSize: false,
fallback: void 0,
focus: void 0,
background: '',
width: void 0,
height: void 0,
ariaHidden: false,
alt: '',
title: ''
}),
computed: {
computedStyle: ({ background }) => {
return [
background && `background: ${background};`
].filter(Boolean).join('')
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},
focusStyle: ({ focus }) => {
// Here we do a pure css version instead of using
// https://github.com/jonom/jquery-focuspoint#1-calculate-your-images-focus-point
if (!focus) return 'background-position: center;'
return `object-position: ${coordsToPercent(focus.x)}% ${100 - coordsToPercent(focus.y)}%;`
},
fillFixSize: ({ forceSize, $groupedImages }) => $groupedImages && !forceSize,
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displaySrc: ({ error, src, fallback }) => ((error && fallback) || src)
}
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}
</script>