phanpy/src/utils/useTruncated.js

import { useRef } from 'preact/hooks';
import { useDebouncedCallback } from 'use-debounce';
import useResizeObserver from 'use-resize-observer';

export default function useTruncated({ className = 'truncated' } = {}) {
  const ref = useRef();
  const onResize = useDebouncedCallback(
    ({ height }) => {
      if (ref.current) {
        const { scrollHeight } = ref.current;
        let truncated = scrollHeight > height;
        if (truncated) {
          const { height: _height, maxHeight } = getComputedStyle(ref.current);
          const computedHeight = parseInt(maxHeight || _height, 10);
          truncated = scrollHeight > computedHeight;
        }
        ref.current.classList.toggle(className, truncated);
      }
    },
    300,
    {
      maxWait: 2000,
    },
  );
  useResizeObserver({
    ref,
    box: 'border-box',
    onResize,
  });
  return ref;
}