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import { |
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useEffect, |
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useLayoutEffect, |
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useRef, |
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useState, |
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} from '@wordpress/element'; |
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import { AnimatePresence, motion } 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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maxRows = 6, |
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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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const [rowHeight, setRowHeight] = useState('auto'); |
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|
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useLayoutEffect(() => { |
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if (!ref.current) return; |
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const computedStyle = window.getComputedStyle(ref.current); |
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const lineHeight = parseFloat(computedStyle.lineHeight || '20px'); |
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setRowHeight(lineHeight); |
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}, []); |
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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) => { |
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tempTextarea.style[prop] = styles[prop]; |
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}); |
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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 < 52 ? 52 : tempTextarea.scrollHeight); |
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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: `${height}px` }} |
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transition={{ duration: 0.2 }} |
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style={{ |
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overflow: 'hidden', |
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maxHeight: rowHeight ? `${rowHeight * maxRows + 16}px` : 'none', |
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}} |
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> |
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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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placeholder={placeholder} |
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style={{ |
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overflowY: height < rowHeight * maxRows ? 'hidden' : 'scroll', |
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maxHeight: rowHeight ? `${rowHeight * maxRows}px` : 'none', |
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boxShadow: 'none', |
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}} |
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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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|
