@material-ui/core/es/Paper/Paper.js

React components that implement Google's Material Design.

import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
import _extends from "@babel/runtime/helpers/esm/extends";
import React from 'react';
import PropTypes from 'prop-types';
import clsx from 'clsx';
import withStyles from '../styles/withStyles';
import useTheme from '../styles/useTheme';
export const styles = theme => {
  const elevations = {};
  theme.shadows.forEach((shadow, index) => {
    elevations[`elevation${index}`] = {
      boxShadow: shadow
    };
  });
  return _extends({
    /* Styles applied to the root element. */
    root: {
      backgroundColor: theme.palette.background.paper,
      color: theme.palette.text.primary,
      transition: theme.transitions.create('box-shadow')
    },

    /* Styles applied to the root element if `square={false}`. */
    rounded: {
      borderRadius: theme.shape.borderRadius
    }
  }, elevations);
};
const Paper = React.forwardRef(function Paper(props, ref) {
  const {
    classes,
    className,
    component: Component = 'div',
    square = false,
    elevation = 1
  } = props,
        other = _objectWithoutPropertiesLoose(props, ["classes", "className", "component", "square", "elevation"]);

  if (process.env.NODE_ENV !== 'production') {
    // eslint-disable-next-line react-hooks/rules-of-hooks
    const theme = useTheme();

    if (!theme.shadows[elevation]) {
      console.error(`Material-UI: this elevation \`${elevation}\` is not implemented.`);
    }
  }

  return React.createElement(Component, _extends({
    className: clsx(classes.root, classes[`elevation${elevation}`], className, !square && classes.rounded),
    ref: ref
  }, other));
});
process.env.NODE_ENV !== "production" ? Paper.propTypes = {
  /**
   * The content of the component.
   */
  children: PropTypes.node,

  /**
   * Override or extend the styles applied to the component.
   * See [CSS API](#css) below for more details.
   */
  classes: PropTypes.object.isRequired,

  /**
   * @ignore
   */
  className: PropTypes.string,

  /**
   * The component used for the root node.
   * Either a string to use a DOM element or a component.
   */
  component: PropTypes.elementType,

  /**
   * Shadow depth, corresponds to `dp` in the spec.
   * It accepts values between 0 and 24 inclusive.
   */
  elevation: PropTypes.number,

  /**
   * If `true`, rounded corners are disabled.
   */
  square: PropTypes.bool
} : void 0;
export default withStyles(styles, {
  name: 'MuiPaper'
})(Paper);