@carbon/react/es/components/SkeletonText/SkeletonText.js

React components for the Carbon Design System

/**
 * Copyright IBM Corp. 2016, 2023
 *
 * This source code is licensed under the Apache-2.0 license found in the
 * LICENSE file in the root directory of this source tree.
 */

import { extends as _extends } from '../../_virtual/_rollupPluginBabelHelpers.js';
import PropTypes from 'prop-types';
import React, { useRef } from 'react';
import cx from 'classnames';
import { usePrefix } from '../../internal/usePrefix.js';
import useIsomorphicEffect from '../../internal/useIsomorphicEffect.js';

const randoms = [0.973051493507435, 0.15334737213558558, 0.5671034553053769];
function getRandomInt(min, max, n) {
  return Math.floor(randoms[n % 3] * (max - min + 1)) + min;
}
const SkeletonText = ({
  paragraph = false,
  lineCount = 3,
  width = '100%',
  heading = false,
  className = '',
  ...rest
}) => {
  const prefix = usePrefix();
  const skeletonTextClasses = cx({
    [`${prefix}--skeleton__text`]: true,
    [`${prefix}--skeleton__heading`]: heading,
    [className]: className
  });
  const widthNum = parseInt(width, 10);
  const widthPx = width.includes('px');
  const widthPercent = width.includes('%');
  let lineCountNumber = 1;
  if (paragraph) {
    lineCountNumber = lineCount;
  }
  const refs = useRef([]);
  useIsomorphicEffect(() => {
    refs.current.map((item, j) => {
      const randomPercentWidth = getRandomInt(0, 75, j) + 'px';
      const randomPxWidth = getRandomInt(Math.max(widthNum - 75, 0), widthNum, j) + 'px';
      if (item) {
        if (widthPercent && paragraph) {
          item.style.width = `calc(${width} - ${randomPercentWidth})`;
        } else if (widthPx && paragraph) {
          item.style.width = randomPxWidth;
        } else {
          item.style.width = width;
        }
      }
    });
  }, [lineCountNumber, paragraph, refs, width, widthNum, widthPercent, widthPx]);
  const lines = [];
  for (let i = 0; i < lineCountNumber; i++) {
    lines.push(/*#__PURE__*/React.createElement("p", _extends({
      className: skeletonTextClasses,
      key: i,
      ref: el => {
        refs.current = [...refs.current, el];
      }
    }, rest)));
  }
  if (lineCountNumber !== 1) {
    return /*#__PURE__*/React.createElement("div", null, lines);
  }

  // eslint-disable-next-line react/jsx-no-useless-fragment
  return /*#__PURE__*/React.createElement(React.Fragment, null, lines);
};
SkeletonText.propTypes = {
  /**
   * Specify an optional className to be applied to the container node
   */
  className: PropTypes.string,
  /**
   * generates skeleton text at a larger size
   */
  heading: PropTypes.bool,
  /**
   * the number of lines shown if paragraph is true
   */
  lineCount: PropTypes.number,
  /**
   * will generate multiple lines of text
   */
  paragraph: PropTypes.bool,
  /**
   * width (in px or %) of single line of text or max-width of paragraph lines
   */
  width: PropTypes.string
};

export { SkeletonText as default };