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useDrop.js
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useDrop.js
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import { useEffect, useState } from 'react';
function useDrop(ref, onLoad = () => {}) {
const [uploading, setUploading] = useState(false);
const [isOver, setOver] = useState(false);
const stopDefault = e => {
e.preventDefault();
e.stopPropagation();
};
useEffect(() => {
const dragLeaveHandler = e => {
setOver(false);
stopDefault(e);
};
const dragOverHandler = e => {
setOver(true);
stopDefault(e);
};
const dropHandler = e => {
setOver(false);
stopDefault(e);
uploadHandler(e.dataTransfer.files);
};
const uploadHandler = files => {
if (
files &&
files[0] &&
files[0].name &&
/\.(md)$/i.test(files[0].name) &&
!uploading
) {
const reader = new FileReader();
reader.onload = e => {
setUploading(false);
onLoad(e.target.result);
};
reader.readAsText(files[0]);
setUploading(true);
}
};
const target = ref.current;
if (!target) return;
target.addEventListener('dragenter', stopDefault, true);
target.addEventListener('dragover', dragOverHandler, true);
target.addEventListener('dragleave', dragLeaveHandler, true);
target.addEventListener('drop', dropHandler, true);
return () => {
target.removeEventListener('dragenter', stopDefault, true);
target.removeEventListener('dragover', dragOverHandler, true);
target.removeEventListener('dragleave', dragLeaveHandler, true);
target.removeEventListener('drop', dropHandler, true);
};
}, [ref, onLoad, uploading, isOver]);
return [uploading, isOver];
}
export default useDrop;