content: import React from 'react';
  import PropTypes from 'prop-types';
  import clsx from 'clsx';
  import withStyles from '../styles/withStyles';
  import ButtonBase from '../ButtonBase';
  import { capitalize } from '../utils/helpers';
  
  export const styles = theme => ({
    /* Styles applied to the root element. */
    root: {
      ...theme.typography.button,
      boxSizing: 'border-box',
      minHeight: 36,
      transition: theme.transitions.create(['background-color', 'box-shadow', 'border'], {
        duration: theme.transitions.duration.short,
      }),
      borderRadius: '50%',
      padding: 0,
      minWidth: 0,
      width: 56,
      height: 56,
      boxShadow: theme.shadows[6],
      '&:active': {
        boxShadow: theme.shadows[12],
      },
      color: theme.palette.getContrastText(theme.palette.grey[300]),
      backgroundColor: theme.palette.grey[300],
      '&$focusVisible': {
        boxShadow: theme.shadows[6],
      },
      '&:hover': {
        backgroundColor: theme.palette.grey.A100,
        // Reset on touch devices, it doesn't add specificity
        '@media (hover: none)': {
          backgroundColor: theme.palette.grey[300],
        },
        '&$disabled': {
          backgroundColor: theme.palette.action.disabledBackground,
        },
        textDecoration: 'none',
      },
      '&$disabled': {
        color: theme.palette.action.disabled,
        boxShadow: theme.shadows[0],
        backgroundColor: theme.palette.action.disabledBackground,
      },
    },
    /* Styles applied to the span element that wraps the children. */
    label: {
      width: '100%', // assure the correct width for iOS Safari
      display: 'inherit',
      alignItems: 'inherit',
      justifyContent: 'inherit',
    },
    /* Styles applied to the root element if `color="primary"`. */
    primary: {
      color: theme.palette.primary.contrastText,
      backgroundColor: theme.palette.primary.main,
      '&:hover': {
        backgroundColor: theme.palette.primary.dark,
        // Reset on touch devices, it doesn't add specificity
        '@media (hover: none)': {
          backgroundColor: theme.palette.primary.main,
        },
      },
    },
    /* Styles applied to the root element if `color="secondary"`. */
    secondary: {
      color: theme.palette.secondary.contrastText,
      backgroundColor: theme.palette.secondary.main,
      '&:hover': {
        backgroundColor: theme.palette.secondary.dark,
        // Reset on touch devices, it doesn't add specificity
        '@media (hover: none)': {
          backgroundColor: theme.palette.secondary.main,
        },
      },
    },
    /* Styles applied to the root element if `variant="extended"`. */
    extended: {
      borderRadius: 48 / 2,
      padding: '0 16px',
      width: 'auto',
      minHeight: 'auto',
      minWidth: 48,
      height: 48,
      '&$sizeSmall': {
        width: 'auto',
        padding: '0 8px',
        borderRadius: 34 / 2,
        minWidth: 34,
        height: 34,
      },
      '&$sizeMedium': {
        width: 'auto',
        padding: '0 16px',
        borderRadius: 40 / 2,
        minWidth: 40,
        height: 40,
      },
    },
    /* Styles applied to the ButtonBase root element if the button is keyboard focused. */
    focusVisible: {},
    /* Styles applied to the root element if `disabled={true}`. */
    disabled: {},
    /* Styles applied to the root element if `color="inherit"`. */
    colorInherit: {
      color: 'inherit',
    },
    /* Styles applied to the root element if `size="small"``. */
    sizeSmall: {
      width: 40,
      height: 40,
    },
    /* Styles applied to the root element if `size="medium"``. */
    sizeMedium: {
      width: 48,
      height: 48,
    },
  });
  
  const Fab = React.forwardRef(function Fab(props, ref) {
    const {
      children,
      classes,
      className,
      color = 'default',
      component = 'button',
      disabled = false,
      disableFocusRipple = false,
      focusVisibleClassName,
      size = 'large',
      variant = 'round',
      ...other
    } = props;
  
    return (
      <ButtonBase
        className={clsx(
          classes.root,
          {
            [classes.extended]: variant === 'extended',
            [classes.primary]: color === 'primary',
            [classes.secondary]: color === 'secondary',
            [classes[`size${capitalize(size)}`]]: size !== 'large',
            [classes.disabled]: disabled,
            [classes.colorInherit]: color === 'inherit',
          },
          className,
        )}
        component={component}
        disabled={disabled}
        focusRipple={!disableFocusRipple}
        focusVisibleClassName={clsx(classes.focusVisible, focusVisibleClassName)}
        ref={ref}
        {...other}
      >
        <span className={classes.label}>{children}</span>
      </ButtonBase>
    );
  });
  
  Fab.propTypes = {
    /**
     * The content of the button.
     */
    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 component. It supports those theme colors that make sense for this component.
     */
    color: PropTypes.oneOf(['default', 'inherit', 'primary', 'secondary']),
    /**
     * The component used for the root node.
     * Either a string to use a DOM element or a component.
     */
    component: PropTypes.elementType,
    /**
     * If `true`, the button will be disabled.
     */
    disabled: PropTypes.bool,
    /**
     * If `true`, the  keyboard focus ripple will be disabled.
     * `disableRipple` must also be true.
     */
    disableFocusRipple: PropTypes.bool,
    /**
     * If `true`, the ripple effect will be disabled.
     */
    disableRipple: PropTypes.bool,
    /**
     * @ignore
     */
    focusVisibleClassName: PropTypes.string,
    /**
     * The URL to link to when the button is clicked.
     * If defined, an `a` element will be used as the root node.
     */
    href: PropTypes.string,
    /**
     * The size of the button.
     * `small` is equivalent to the dense button styling.
     */
    size: PropTypes.oneOf(['small', 'medium', 'large']),
    /**
     * @ignore
     */
    type: PropTypes.string,
    /**
     * The variant to use.
     */
    variant: PropTypes.oneOf(['round', 'extended']),
  };
  
  export default withStyles(styles, { name: 'MuiFab' })(Fab);
  