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

React components that implement Google's Material Design.

import _extends from "@babel/runtime/helpers/esm/extends";
import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
import React from 'react';
import PropTypes from 'prop-types';
import clsx from 'clsx';
import { chainPropTypes } from '@material-ui/utils';
import withStyles from '../styles/withStyles';
import { capitalize } from '../utils/helpers';
const SIZE = 44;

function getRelativeValue(value, min, max) {
  const clampedValue = Math.min(Math.max(min, value), max);
  return (clampedValue - min) / (max - min);
}

function easeOut(t) {
  t = getRelativeValue(t, 0, 1); // https://gist.github.com/gre/1650294

  t = (t -= 1) * t * t + 1;
  return t;
}

function easeIn(t) {
  return t * t;
}

export const styles = theme => ({
  /* Styles applied to the root element. */
  root: {
    display: 'inline-block',
    lineHeight: 1 // Keep the progress centered

  },

  /* Styles applied to the root element if `variant="static"`. */
  static: {
    transition: theme.transitions.create('transform')
  },

  /* Styles applied to the root element if `variant="indeterminate"`. */
  indeterminate: {
    animation: '$mui-progress-circular-rotate 1.4s linear infinite'
  },

  /* Styles applied to the root element if `color="primary"`. */
  colorPrimary: {
    color: theme.palette.primary.main
  },

  /* Styles applied to the root element if `color="secondary"`. */
  colorSecondary: {
    color: theme.palette.secondary.main
  },

  /* Styles applied to the `svg` element. */
  svg: {},

  /* Styles applied to the `circle` svg path. */
  circle: {
    stroke: 'currentColor' // Use butt to follow the specification, by chance, it's already the default CSS value.
    // strokeLinecap: 'butt',

  },

  /* Styles applied to the `circle` svg path if `variant="static"`. */
  circleStatic: {
    transition: theme.transitions.create('stroke-dashoffset')
  },

  /* Styles applied to the `circle` svg path if `variant="indeterminate"`. */
  circleIndeterminate: {
    animation: '$mui-progress-circular-dash 1.4s ease-in-out infinite',
    // Some default value that looks fine waiting for the animation to kicks in.
    strokeDasharray: '80px, 200px',
    strokeDashoffset: '0px' // Add the unit to fix a Edge 16 and below bug.

  },
  '@keyframes mui-progress-circular-rotate': {
    '100%': {
      transform: 'rotate(360deg)'
    }
  },
  '@keyframes mui-progress-circular-dash': {
    '0%': {
      strokeDasharray: '1px, 200px',
      strokeDashoffset: '0px'
    },
    '50%': {
      strokeDasharray: '100px, 200px',
      strokeDashoffset: '-15px'
    },
    '100%': {
      strokeDasharray: '100px, 200px',
      strokeDashoffset: '-125px'
    }
  },

  /* Styles applied to the `circle` svg path if `disableShrink={true}`. */
  circleDisableShrink: {
    animation: 'none'
  }
});
/**
 * ## ARIA
 *
 * If the progress bar is describing the loading progress of a particular region of a page,
 * you should use `aria-describedby` to point to the progress bar, and set the `aria-busy`
 * attribute to `true` on that region until it has finished loading.
 */

const CircularProgress = React.forwardRef(function CircularProgress(props, ref) {
  const {
    classes,
    className,
    color = 'primary',
    disableShrink = false,
    size = 40,
    style,
    thickness = 3.6,
    value = 0,
    variant = 'indeterminate'
  } = props,
        other = _objectWithoutPropertiesLoose(props, ["classes", "className", "color", "disableShrink", "size", "style", "thickness", "value", "variant"]);

  const circleStyle = {};
  const rootStyle = {};
  const rootProps = {};

  if (variant === 'determinate' || variant === 'static') {
    const circumference = 2 * Math.PI * ((SIZE - thickness) / 2);
    circleStyle.strokeDasharray = circumference.toFixed(3);
    rootProps['aria-valuenow'] = Math.round(value);

    if (variant === 'static') {
      circleStyle.strokeDashoffset = `${((100 - value) / 100 * circumference).toFixed(3)}px`;
      rootStyle.transform = 'rotate(-90deg)';
    } else {
      circleStyle.strokeDashoffset = `${(easeIn((100 - value) / 100) * circumference).toFixed(3)}px`;
      rootStyle.transform = `rotate(${(easeOut(value / 70) * 270).toFixed(3)}deg)`;
    }
  }

  return React.createElement("div", _extends({
    className: clsx(classes.root, className, color !== 'inherit' && classes[`color${capitalize(color)}`], {
      indeterminate: classes.indeterminate,
      static: classes.static
    }[variant]),
    style: _extends({
      width: size,
      height: size
    }, rootStyle, {}, style),
    ref: ref,
    role: "progressbar"
  }, rootProps, other), React.createElement("svg", {
    className: classes.svg,
    viewBox: `${SIZE / 2} ${SIZE / 2} ${SIZE} ${SIZE}`
  }, React.createElement("circle", {
    className: clsx(classes.circle, disableShrink && classes.circleDisableShrink, {
      indeterminate: classes.circleIndeterminate,
      static: classes.circleStatic
    }[variant]),
    style: circleStyle,
    cx: SIZE,
    cy: SIZE,
    r: (SIZE - thickness) / 2,
    fill: "none",
    strokeWidth: thickness
  })));
});
process.env.NODE_ENV !== "production" ? CircularProgress.propTypes = {
  /**
   * 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 color of the component. It supports those theme colors that make sense for this component.
   */
  color: PropTypes.oneOf(['primary', 'secondary', 'inherit']),

  /**
   * If `true`, the shrink animation is disabled.
   * This only works if variant is `indeterminate`.
   */
  disableShrink: chainPropTypes(PropTypes.bool, props => {
    if (props.disableShrink && props.variant && props.variant !== 'indeterminate') {
      return new Error('Material-UI: you have provided the `disableShrink` prop ' + 'with a variant other than `indeterminate`. This will have no effect.');
    }

    return null;
  }),

  /**
   * The size of the circle.
   */
  size: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),

  /**
   * @ignore
   */
  style: PropTypes.object,

  /**
   * The thickness of the circle.
   */
  thickness: PropTypes.number,

  /**
   * The value of the progress indicator for the determinate and static variants.
   * Value between 0 and 100.
   */
  value: PropTypes.number,

  /**
   * The variant to use.
   * Use indeterminate when there is no progress value.
   */
  variant: PropTypes.oneOf(['determinate', 'indeterminate', 'static'])
} : void 0;
export default withStyles(styles, {
  name: 'MuiCircularProgress',
  flip: false
})(CircularProgress);