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/**
* Image gallery
*/
import React, { useState, useEffect } from "react";
export default function Gallery({ images, visible }) {
const hasItems = !!images?.length;
const oneItem = images?.length === 1;
const [index, setIndex] = useState(0);
const [opacity, setOpacity] = useState(0);
useEffect(() => {
setIndex(0);
setOpacity(0);
setTimeout(() => setOpacity(1), 500);
}, [images]);
function previous() {
setOpacity(0);
setTimeout(() => setIndex(Math.max(0, index - 1)), 100);
// setTimeout(() => setOpacity(1), 500);
}
function next() {
setOpacity(0);
setTimeout(() => setIndex(Math.min(images.length - 1, index + 1)), 100);
// setTimeout(() => setOpacity(1), 500);
}
function nextOrWrap() {
if (oneItem) return;
setOpacity(0);
setTimeout(() => setIndex(mod(index + 1, images.length)), 100);
// setTimeout(() => setOpacity(1), 500);
}
function appear() {
setOpacity(1);
}
if (!hasItems) {
return <div className="gallery" style={{ opacity: 0 }} />;
}
return (
<div className="gallery" style={{ opacity: visible ? 1 : 0 }}>
<div className="image">
{visible && !!images[index] && (
<img
src={images[index].uri}
onClick={nextOrWrap}
onLoad={appear}
style={{ opacity }}
/>
)}
</div>
<div className="buttons">
{!oneItem && (
<img
src="/assets/img/arrow-back.svg"
onClick={previous}
style={{ opacity: index > 0 ? 1 : 0 }}
/>
)}
{!oneItem && (
<img
src="/assets/img/arrow-forward.svg"
onClick={next}
style={{ opacity: index < images.length - 1 ? 1 : 0 }}
/>
)}
</div>
</div>
);
}
const mod = (n, m) => n - m * Math.floor(n / m);
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