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import { |
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useLayoutEffect, |
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useEffect, |
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useRef, |
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useState, |
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} from '@wordpress/element' |
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import { motion, AnimatePresence } from 'framer-motion' |
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|
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export const DynamicTextarea = ({ |
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value, |
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className, |
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onChange, |
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onKeyDown, |
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disabled, |
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placeholder, |
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}) => { |
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const ref = useRef(null) |
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const [height, setHeight] = useState('auto') |
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|
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// Dynamically resize the input by creating a temporary version and measuring the height. |
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// This is a workaround for scrollHeight not reducing when text is deleted. |
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useLayoutEffect(() => { |
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const tempTextarea = document.createElement('textarea') |
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tempTextarea.value = value || placeholder |
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tempTextarea.rows = 1 // Start at 1 |
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|
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const styleProps = [ |
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'paddingTop', |
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'paddingBottom', |
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'paddingLeft', |
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'paddingRight', |
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'width', |
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'fontFamily', |
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'fontSize', |
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'borderWidth', |
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] |
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|
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const styles = window.getComputedStyle(ref.current) |
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|
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// apply styles to the temporary textarea |
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styleProps.forEach((prop) => (tempTextarea.style[prop] = styles[prop])) |
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|
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Object.assign(tempTextarea.style, { |
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position: 'absolute', |
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left: '-9999px', |
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}) |
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|
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document.body.appendChild(tempTextarea) |
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setHeight(`${tempTextarea.scrollHeight}px`) |
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document.body.removeChild(tempTextarea) |
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}, [value, placeholder]) |
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|
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// Focus the input. |
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useEffect(() => { |
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const input = ref.current |
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if (!input) return |
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if (document.activeElement === input) return |
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|
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const inputLength = input.value.length |
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input.focus() |
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input.setSelectionRange(inputLength, inputLength) // Place cursor at the end of the input. |
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}, [value]) |
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|
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return ( |
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<AnimatePresence> |
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<motion.div |
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key="input" |
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animate={{ height }} |
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transition={{ duration: 0.2 }} |
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style={{ lineHeight: 0 }}> |
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<label htmlFor="draft-ai-textarea" className="sr-only"> |
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{placeholder} |
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</label> |
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<textarea |
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ref={ref} |
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id="draft-ai-textarea" |
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disabled={disabled} |
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className={className} |
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value={value} |
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rows={1} |
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onChange={onChange} |
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onKeyDown={onKeyDown} |
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onScroll={(event) => { |
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event.target.scrollTop = 0 |
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}} |
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placeholder={placeholder} |
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/> |
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</motion.div> |
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</AnimatePresence> |
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) |
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} |
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|
