@material-ui/core/es/Link/Link.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 { capitalize } from '../utils/helpers';
import withStyles from '../styles/withStyles';
import { useIsFocusVisible } from '../utils/focusVisible';
import { useForkRef } from '../utils/reactHelpers';
import Typography from '../Typography';
export const styles = {
  /* Styles applied to the root element. */
  root: {},

  /* Styles applied to the root element if `underline="none"`. */
  underlineNone: {
    textDecoration: 'none'
  },

  /* Styles applied to the root element if `underline="hover"`. */
  underlineHover: {
    textDecoration: 'none',
    '&:hover': {
      textDecoration: 'underline'
    }
  },

  /* Styles applied to the root element if `underline="always"`. */
  underlineAlways: {
    textDecoration: 'underline'
  },
  // Same reset as ButtonBase.root

  /* Styles applied to the root element if `component="button"`. */
  button: {
    position: 'relative',
    // Remove grey highlight
    WebkitTapHighlightColor: 'transparent',
    backgroundColor: 'transparent',
    // Reset default value
    // We disable the focus ring for mouse, touch and keyboard users.
    outline: 'none',
    border: 0,
    margin: 0,
    // Remove the margin in Safari
    borderRadius: 0,
    padding: 0,
    // Remove the padding in Firefox
    cursor: 'pointer',
    userSelect: 'none',
    verticalAlign: 'middle',
    '-moz-appearance': 'none',
    // Reset
    '-webkit-appearance': 'none',
    // Reset
    '&::-moz-focus-inner': {
      borderStyle: 'none' // Remove Firefox dotted outline.

    },
    '&$focusVisible': {
      outline: 'auto'
    }
  },

  /* Pseudo-class applied to the root element if the link is keyboard focused. */
  focusVisible: {}
};
const Link = React.forwardRef(function Link(props, ref) {
  const {
    classes,
    className,
    color = 'primary',
    component = 'a',
    onBlur,
    onFocus,
    TypographyClasses,
    underline = 'hover',
    variant = 'inherit'
  } = props,
        other = _objectWithoutPropertiesLoose(props, ["classes", "className", "color", "component", "onBlur", "onFocus", "TypographyClasses", "underline", "variant"]);

  const {
    isFocusVisible,
    onBlurVisible,
    ref: focusVisibleRef
  } = useIsFocusVisible();
  const [focusVisible, setFocusVisible] = React.useState(false);
  const handlerRef = useForkRef(ref, focusVisibleRef);

  const handleBlur = event => {
    if (focusVisible) {
      onBlurVisible();
      setFocusVisible(false);
    }

    if (onBlur) {
      onBlur(event);
    }
  };

  const handleFocus = event => {
    if (isFocusVisible(event)) {
      setFocusVisible(true);
    }

    if (onFocus) {
      onFocus(event);
    }
  };

  return React.createElement(Typography, _extends({
    className: clsx(classes.root, classes[`underline${capitalize(underline)}`], className, focusVisible && classes.focusVisible, {
      button: classes.button
    }[component]),
    classes: TypographyClasses,
    color: color,
    component: component,
    onBlur: handleBlur,
    onFocus: handleFocus,
    ref: handlerRef,
    variant: variant
  }, other));
});
process.env.NODE_ENV !== "production" ? Link.propTypes = {
  /**
   * The content of the link.
   */
  children: PropTypes.node.isRequired,

  /**
   * 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 link.
   */
  color: PropTypes.oneOf(['default', 'error', 'inherit', 'primary', 'secondary', 'textPrimary', 'textSecondary']),

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

  /**
   * @ignore
   */
  onBlur: PropTypes.func,

  /**
   * @ignore
   */
  onFocus: PropTypes.func,

  /**
   * `classes` prop applied to the [`Typography`](/api/typography/) element.
   */
  TypographyClasses: PropTypes.object,

  /**
   *  Controls when the link should have an underline.
   */
  underline: PropTypes.oneOf(['none', 'hover', 'always']),

  /**
   * Applies the theme typography styles.
   */
  variant: PropTypes.string
} : void 0;
export default withStyles(styles, {
  name: 'MuiLink'
})(Link);