lbry-desktop/ui/component/fileDescription/view.jsx

// @flow
import React from 'react';
import classnames from 'classnames';
import MarkdownPreview from 'component/common/markdown-preview';
import ClaimTags from 'component/claimTags';
import Button from 'component/button';

type Props = {
  uri: string,
  claim: StreamClaim,
  metadata: StreamMetadata,
  user: ?any,
  tags: any,
};

function FileDescription(props: Props) {
  const { uri, claim, metadata, tags } = props;
  const [expanded, setExpanded] = React.useState(false);
  const [hasOverflow, setHasOverflow] = React.useState(false);
  const [hasCalculatedOverflow, setHasCalculatedOverflow] = React.useState(false);
  const descriptionRef = React.useRef();

  React.useEffect(() => {
    if (descriptionRef && descriptionRef.current) {
      const element = descriptionRef.current;
      const isOverflowing = element.scrollHeight > element.clientHeight;
      setHasOverflow(isOverflowing);
      setHasCalculatedOverflow(true);
    }
  }, [descriptionRef]);

  if (!claim || !metadata) {
    return <span className="empty">{__('Empty claim or metadata info.')}</span>;
  }

  const { description } = metadata;

  if (!description && !(tags && tags.length)) return null;

  return (
    <div>
      <div
        ref={descriptionRef}
        className={classnames({
          'media__info-text--contracted': !expanded,
          'media__info-text--expanded': expanded,
          'media__info-text--fade': hasOverflow && !expanded,
        })}
      >
        <MarkdownPreview className="markdown-preview--description" content={description} />
        <ClaimTags uri={uri} type="large" />
      </div>
      {hasCalculatedOverflow && hasOverflow && (
        <div className="media__info-expand">
          {expanded ? (
            <Button button="link" label={__('Less')} onClick={() => setExpanded(!expanded)} />
          ) : (
            <Button button="link" label={__('More')} onClick={() => setExpanded(!expanded)} />
          )}
        </div>
      )}
    </div>
  );
}

export default FileDescription;