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import {TextareaHTMLAttributes, useLayoutEffect, useRef} from 'react'
/**
* A textarea that grows with its content, so long notes are readable in
* full instead of scrolling inside a one-line box. `singleLine` keeps it
* one paragraph (Enter doesn't add a line), for titles.
*/
export default function AutoTextarea({
singleLine = false,
value,
onKeyDown,
...props
}: TextareaHTMLAttributes<HTMLTextAreaElement> & {
singleLine?: boolean
value: string
}) {
const ref = useRef<HTMLTextAreaElement>(null)
useLayoutEffect(() => {
const el = ref.current
if (!el) return
el.style.height = 'auto'
el.style.height = `${el.scrollHeight}px`
}, [value])
return (
<textarea
ref={ref}
rows={1}
value={value}
onKeyDown={(e) => {
if (singleLine && e.key === 'Enter') {
e.preventDefault()
e.currentTarget.blur()
}
onKeyDown?.(e)
}}
{...props}
style={{resize: 'none', overflow: 'hidden', ...props.style}}
/>
)
}
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