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

import _extends from "@babel/runtime/helpers/esm/extends";
import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
import * as React from 'react';
import { isFragment } from 'react-is';
import PropTypes from 'prop-types';
import clsx from 'clsx';
import { HTMLElementType } from '@material-ui/utils';
import withStyles from '../styles/withStyles';
import Popover from '../Popover';
import MenuList from '../MenuList';
import * as ReactDOM from 'react-dom';
import setRef from '../utils/setRef';
import useTheme from '../styles/useTheme';
import deprecatedPropType from '../utils/deprecatedPropType';
const RTL_ORIGIN = {
  vertical: 'top',
  horizontal: 'right'
};
const LTR_ORIGIN = {
  vertical: 'top',
  horizontal: 'left'
};
export const styles = {
  /* Styles applied to the `Paper` component. */
  paper: {
    // specZ: The maximum height of a simple menu should be one or more rows less than the view
    // height. This ensures a tapable area outside of the simple menu with which to dismiss
    // the menu.
    maxHeight: 'calc(100% - 96px)',
    // Add iOS momentum scrolling.
    WebkitOverflowScrolling: 'touch'
  },

  /* Styles applied to the `List` component via `MenuList`. */
  list: {
    // We disable the focus ring for mouse, touch and keyboard users.
    outline: 0
  }
};
const Menu = /*#__PURE__*/React.forwardRef(function Menu(props, ref) {
  const {
    autoFocus = true,
    children,
    classes,
    disableAutoFocusItem = false,
    MenuListProps = {},
    onClose,
    onEntering: onEnteringProp,
    open,
    PaperProps = {},
    PopoverClasses,
    transitionDuration = 'auto',
    TransitionProps: {
      onEntering
    } = {},
    variant = 'selectedMenu'
  } = props,
        TransitionProps = _objectWithoutPropertiesLoose(props.TransitionProps, ["onEntering"]),
        other = _objectWithoutPropertiesLoose(props, ["autoFocus", "children", "classes", "disableAutoFocusItem", "MenuListProps", "onClose", "onEntering", "open", "PaperProps", "PopoverClasses", "transitionDuration", "TransitionProps", "variant"]);

  const theme = useTheme();
  const autoFocusItem = autoFocus && !disableAutoFocusItem && open;
  const menuListActionsRef = React.useRef(null);
  const contentAnchorRef = React.useRef(null);

  const getContentAnchorEl = () => contentAnchorRef.current;

  const handleEntering = (element, isAppearing) => {
    if (menuListActionsRef.current) {
      menuListActionsRef.current.adjustStyleForScrollbar(element, theme);
    }

    if (onEnteringProp) {
      onEnteringProp(element, isAppearing);
    }

    if (onEntering) {
      onEntering(element, isAppearing);
    }
  };

  const handleListKeyDown = event => {
    if (event.key === 'Tab') {
      event.preventDefault();

      if (onClose) {
        onClose(event, 'tabKeyDown');
      }
    }
  };
  /**
   * the index of the item should receive focus
   * in a `variant="selectedMenu"` it's the first `selected` item
   * otherwise it's the very first item.
   */


  let activeItemIndex = -1; // since we inject focus related props into children we have to do a lookahead
  // to check if there is a `selected` item. We're looking for the last `selected`
  // item and use the first valid item as a fallback

  React.Children.map(children, (child, index) => {
    if (! /*#__PURE__*/React.isValidElement(child)) {
      return;
    }

    if (process.env.NODE_ENV !== 'production') {
      if (isFragment(child)) {
        console.error(["Material-UI: The Menu component doesn't accept a Fragment as a child.", 'Consider providing an array instead.'].join('\n'));
      }
    }

    if (!child.props.disabled) {
      if (variant !== "menu" && child.props.selected) {
        activeItemIndex = index;
      } else if (activeItemIndex === -1) {
        activeItemIndex = index;
      }
    }
  });
  const items = React.Children.map(children, (child, index) => {
    if (index === activeItemIndex) {
      return /*#__PURE__*/React.cloneElement(child, {
        ref: instance => {
          // #StrictMode ready
          contentAnchorRef.current = ReactDOM.findDOMNode(instance);
          setRef(child.ref, instance);
        }
      });
    }

    return child;
  });
  return /*#__PURE__*/React.createElement(Popover, _extends({
    getContentAnchorEl: getContentAnchorEl,
    classes: PopoverClasses,
    onClose: onClose,
    TransitionProps: _extends({
      onEntering: handleEntering
    }, TransitionProps),
    anchorOrigin: theme.direction === 'rtl' ? RTL_ORIGIN : LTR_ORIGIN,
    transformOrigin: theme.direction === 'rtl' ? RTL_ORIGIN : LTR_ORIGIN,
    PaperProps: _extends({}, PaperProps, {
      classes: _extends({}, PaperProps.classes, {
        root: classes.paper
      })
    }),
    open: open,
    ref: ref,
    transitionDuration: transitionDuration
  }, other), /*#__PURE__*/React.createElement(MenuList, _extends({
    onKeyDown: handleListKeyDown,
    actions: menuListActionsRef,
    autoFocus: autoFocus && (activeItemIndex === -1 || disableAutoFocusItem),
    autoFocusItem: autoFocusItem,
    variant: variant
  }, MenuListProps, {
    className: clsx(classes.list, MenuListProps.className)
  }), items));
});
process.env.NODE_ENV !== "production" ? Menu.propTypes = {
  // ----------------------------- Warning --------------------------------
  // | These PropTypes are generated from the TypeScript type definitions |
  // |     To update them edit the d.ts file and run "yarn proptypes"     |
  // ----------------------------------------------------------------------

  /**
   * A HTML element, or a function that returns it.
   * It's used to set the position of the menu.
   */
  anchorEl: PropTypes
  /* @typescript-to-proptypes-ignore */
  .oneOfType([HTMLElementType, PropTypes.func]),

  /**
   * If `true` (Default) will focus the `[role="menu"]` if no focusable child is found. Disabled
   * children are not focusable. If you set this prop to `false` focus will be placed
   * on the parent modal container. This has severe accessibility implications
   * and should only be considered if you manage focus otherwise.
   */
  autoFocus: PropTypes.bool,

  /**
   * Menu contents, normally `MenuItem`s.
   */
  children: PropTypes.node,

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

  /**
   * When opening the menu will not focus the active item but the `[role="menu"]`
   * unless `autoFocus` is also set to `false`. Not using the default means not
   * following WAI-ARIA authoring practices. Please be considerate about possible
   * accessibility implications.
   */
  disableAutoFocusItem: PropTypes.bool,

  /**
   * Props applied to the [`MenuList`](/api/menu-list/) element.
   */
  MenuListProps: PropTypes.object,

  /**
   * Callback fired when the component requests to be closed.
   *
   * @param {object} event The event source of the callback.
   * @param {string} reason Can be: `"escapeKeyDown"`, `"backdropClick"`, `"tabKeyDown"`.
   */
  onClose: PropTypes.func,

  /**
   * Callback fired before the Menu enters.
   * @deprecated Use the `TransitionProps` prop instead.
   */
  onEnter: deprecatedPropType(PropTypes.func, 'Use the `TransitionProps` prop instead.'),

  /**
   * Callback fired when the Menu has entered.
   * @deprecated Use the `TransitionProps` prop instead.
   */
  onEntered: deprecatedPropType(PropTypes.func, 'Use the `TransitionProps` prop instead.'),

  /**
   * Callback fired when the Menu is entering.
   * @deprecated Use the `TransitionProps` prop instead.
   */
  onEntering: deprecatedPropType(PropTypes.func, 'Use the `TransitionProps` prop instead.'),

  /**
   * Callback fired before the Menu exits.
   * @deprecated Use the `TransitionProps` prop instead.
   */
  onExit: deprecatedPropType(PropTypes.func, 'Use the `TransitionProps` prop instead.'),

  /**
   * Callback fired when the Menu has exited.
   * @deprecated Use the `TransitionProps` prop instead.
   */
  onExited: deprecatedPropType(PropTypes.func, 'Use the `TransitionProps` prop instead.'),

  /**
   * Callback fired when the Menu is exiting.
   * @deprecated Use the `TransitionProps` prop instead.
   */
  onExiting: deprecatedPropType(PropTypes.func, 'Use the `TransitionProps` prop instead.'),

  /**
   * If `true`, the menu is visible.
   */
  open: PropTypes.bool.isRequired,

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

  /**
   * `classes` prop applied to the [`Popover`](/api/popover/) element.
   */
  PopoverClasses: PropTypes.object,

  /**
   * The length of the transition in `ms`, or 'auto'
   */
  transitionDuration: PropTypes.oneOfType([PropTypes.oneOf(['auto']), PropTypes.number, PropTypes.shape({
    appear: PropTypes.number,
    enter: PropTypes.number,
    exit: PropTypes.number
  })]),

  /**
   * Props applied to the transition element.
   * By default, the element is based on this [`Transition`](http://reactcommunity.org/react-transition-group/transition) component.
   */
  TransitionProps: PropTypes.object,

  /**
   * The variant to use. Use `menu` to prevent selected items from impacting the initial focus
   * and the vertical alignment relative to the anchor element.
   */
  variant: PropTypes.oneOf(['menu', 'selectedMenu'])
} : void 0;
export default withStyles(styles, {
  name: 'MuiMenu'
})(Menu);