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import React, { CSSProperties, FC, HTMLAttributes, InputHTMLAttributes, useEffect, useRef, useState } from 'react';
const supportsInputDirs = 'webkitdirectory' in HTMLInputElement.prototype;
const supportsRelativePath = 'webkitRelativePath' in File.prototype;
const supportsDirs = typeof DataTransferItem != 'undefined' && 'webkitGetAsEntry' in DataTransferItem.prototype;
const readRecurse = (dir: FileSystemDirectoryEntry, onComplete: (files: File[]) => void, onError: (err: Error) => void) => {
let files: File[] = [];
let total = 0;
let errored = false;
let reachedEnd = false;
const onErr = (err: Error) => {
if (!errored) {
errored = true;
onError(err);
}
};
const onDone = (f: File[]) => {
files = files.concat(f);
if (!--total && reachedEnd) onComplete(files);
};
const reader = dir.createReader();
const onRead = (entries: FileSystemEntry[]) => {
if (!entries.length && !errored) {
if (!total) onComplete(files);
else reachedEnd = true;
} else reader.readEntries(onRead, onError);
for (const entry of entries) {
++total;
if (entry.isFile) entry.file(f => onDone([
new File([f], entry.fullPath.slice(1), f)
]), onErr);
else readRecurse(entry as FileSystemDirectoryEntry, onDone, onErr);
}
};
reader.readEntries(onRead, onError);
}
const FilePicker: FC<{
onFiles(files: File[] | null): void;
onDrag(on: boolean): void;
onError(err: string | Error): void;
allowDirs: boolean;
} & Omit<HTMLAttributes<HTMLDivElement>, 'onError'>
> = ({ onFiles, onDrag, onError, style, allowDirs, children, ...props }) => {
const inputRef = useRef<HTMLInputElement>(null);
const dirInputRef = useRef<HTMLInputElement>(null);
const dragRef = useRef(0);
const [inputHover, setInputHover] = useState(false);
const [dirInputHover, setDirInputHover] = useState(false);
const [isHovering, setIsHovering] = useState(false);
useEffect(() => {
// only init'd when support dirs
if (dirInputRef.current) {
dirInputRef.current.setAttribute('webkitdirectory', '');
}
}, []);
const rootProps: HTMLAttributes<HTMLDivElement> = {
onDrop(ev) {
ev.preventDefault();
const tf = ev.dataTransfer;
if (!tf.files.length) onError('Please drop some files in');
else {
onFiles(null);
if (supportsDirs && allowDirs) {
let outFiles: File[] = [];
let lft = tf.items.length;
let errored = false;
const onErr = (err: Error) => {
if (!errored) {
errored = true;
onError(err);
}
}
const onDone = (f: File[]) => {
outFiles = outFiles.concat(f);
if (!--lft && !errored) onFiles(outFiles);
};
for (let i = 0; i < tf.items.length; ++i) {
const entry = tf.items[i].webkitGetAsEntry();
if (entry.isFile) entry.file(f => onDone([f]), onErr);
else readRecurse(entry as FileSystemDirectoryEntry, onDone, onErr);
}
} else onFiles(Array.prototype.slice.call(tf.files));
}
setIsHovering(false);
},
onDragEnter() {
++dragRef.current;
onDrag(true);
setIsHovering(true);
},
onDragOver(ev) {
ev.preventDefault();
},
onDragLeave() {
if (!--dragRef.current) {
onDrag(false);
setIsHovering(false);
}
},
style: {
display: 'flex',
flexDirection: 'column',
alignItems: 'center',
...style
}
};
const inputProps: InputHTMLAttributes<HTMLInputElement> = {
onInput(ev) {
const t = ev.currentTarget, files = t.files!;
if (supportsRelativePath) {
const outFiles: File[] = Array(files.length);
for (let i = 0; i < files.length; ++i) {
const file = files[i];
outFiles[i] = new File([file], file.webkitRelativePath || file.name, file);
}
onFiles(outFiles);
} else onFiles(Array.prototype.slice.call(files));
t.value = '';
},
style: { display: 'none' },
multiple: true
};
const buttonStyles: CSSProperties = {
cursor: 'default',
minWidth: '8vw',
height: '6vh',
margin: '1vmin',
padding: '1vmin',
display: 'flex',
alignItems: 'center',
justifyContent: 'center',
boxShadow: '0 1px 2px 1px rgba(0, 0, 0, 0.2), 0 2px 4px 2px rgba(0, 0, 0, 0.15), 0 4px 8px 4px rgba(0, 0, 0, 0.12)',
border: '1px solid black',
borderRadius: '6px',
transition: 'background-color 300ms ease-in-out',
WebkitTouchCallout: 'none',
WebkitUserSelect: 'none',
msUserSelect: 'none',
MozUserSelect: 'none',
userSelect: 'none'
};
return (
<div {...props} {...rootProps}>
{children}
<div style={{
transition: 'transform ' + (isHovering ? 300 : 50) + 'ms ease-in-out',
transform: isHovering ? 'scale(1.5)' : 'none'
}}>Drag and Drop</div>
<div style={{
borderBottom: '1px solid gray',
margin: '1.5vh',
color: 'gray',
lineHeight: 0,
paddingTop: '1.5vh',
marginBottom: '3vh',
width: '100%',
}}>
<span style={{ background: 'white', padding: '0.25em' }}>OR</span>
</div>
<div style={{
display: 'flex',
flexDirection: 'row',
alignItems: 'center',
justifyContent: 'center',
width: '100%'
}}>
<input type="file" ref={inputRef} {...inputProps} />
<div onClick={() => inputRef.current!.click()} onMouseOver={() => setInputHover(true)} onMouseOut={() => setInputHover(false)} style={{
...buttonStyles,
backgroundColor: inputHover ? 'rgba(0, 0, 0, 0.14)' : 'white'
}}>Select Files</div>
{supportsInputDirs && allowDirs &&
<>
<div style={{ boxShadow: '1px 0 black', height: '100%' }}><span /></div>
<input type="file" ref={dirInputRef} {...inputProps} />
<div onClick={() => dirInputRef.current!.click()} onMouseOver={() => setDirInputHover(true)} onMouseOut={() => setDirInputHover(false)} style={{
...buttonStyles,
marginLeft: '8vmin',
backgroundColor: dirInputHover ? 'rgba(0, 0, 0, 0.14)' : 'white'
}}>Select Folders</div>
</>
}
</div>
</div>
);
}
export default FilePicker;
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