@material-ui/core/esm/Breadcrumbs/Breadcrumbs.js

React components that implement Google's Material Design.

import _extends from "@babel/runtime/helpers/esm/extends";
import _toConsumableArray from "@babel/runtime/helpers/esm/toConsumableArray";
import _slicedToArray from "@babel/runtime/helpers/esm/slicedToArray";
import _objectWithoutProperties from "@babel/runtime/helpers/esm/objectWithoutProperties";
import React from 'react';
import warning from 'warning';
import PropTypes from 'prop-types';
import clsx from 'clsx';
import withStyles from '../styles/withStyles';
import Typography from '../Typography';
import BreadcrumbCollapsed from './BreadcrumbCollapsed';
import BreadcrumbSeparator from './BreadcrumbSeparator';
export var styles = {
  /* Styles applied to the root element. */
  root: {},

  /* Styles applied to the ol element. */
  ol: {
    display: 'flex',
    flexWrap: 'wrap',
    alignItems: 'center',
    padding: 0,
    // Reset
    margin: 0 // Reset

  },

  /* Styles applied to the li element. */
  li: {
    listStyle: 'none'
  },

  /* Styles applied to the separator element. */
  separator: {}
};

function insertSeparators(items, className, separator) {
  return items.reduce(function (acc, current, index) {
    if (index < items.length - 1) {
      acc = acc.concat(current, React.createElement(BreadcrumbSeparator, {
        key: "separator-".concat(index),
        className: className
      }, separator));
    } else {
      acc.push(current);
    }

    return acc;
  }, []);
}

var Breadcrumbs = React.forwardRef(function Breadcrumbs(props, ref) {
  var children = props.children,
      classes = props.classes,
      className = props.className,
      _props$component = props.component,
      Component = _props$component === void 0 ? 'nav' : _props$component,
      _props$itemsAfterColl = props.itemsAfterCollapse,
      itemsAfterCollapse = _props$itemsAfterColl === void 0 ? 1 : _props$itemsAfterColl,
      _props$itemsBeforeCol = props.itemsBeforeCollapse,
      itemsBeforeCollapse = _props$itemsBeforeCol === void 0 ? 1 : _props$itemsBeforeCol,
      _props$maxItems = props.maxItems,
      maxItems = _props$maxItems === void 0 ? 8 : _props$maxItems,
      _props$separator = props.separator,
      separator = _props$separator === void 0 ? '/' : _props$separator,
      other = _objectWithoutProperties(props, ["children", "classes", "className", "component", "itemsAfterCollapse", "itemsBeforeCollapse", "maxItems", "separator"]);

  var _React$useState = React.useState(false),
      _React$useState2 = _slicedToArray(_React$useState, 2),
      expanded = _React$useState2[0],
      setExpanded = _React$useState2[1];

  var renderItemsBeforeAndAfter = function renderItemsBeforeAndAfter(allItems) {
    var handleClickExpand = function handleClickExpand() {
      setExpanded(true);
    }; // This defends against someone passing weird input, to ensure that if all
    // items would be shown anyway, we just show all items without the EllipsisItem


    if (itemsBeforeCollapse + itemsAfterCollapse >= allItems.length) {
      process.env.NODE_ENV !== "production" ? warning(false, ['Material-UI: you have provided an invalid combination of props to the Breadcrumbs.', "itemsAfterCollapse={".concat(itemsAfterCollapse, "} +itemsBeforeCollapse={").concat(itemsBeforeCollapse, "} >= maxItems={").concat(maxItems, "}")].join('\n')) : void 0;
      return allItems;
    }

    return [].concat(_toConsumableArray(allItems.slice(0, itemsBeforeCollapse)), [React.createElement(BreadcrumbCollapsed, {
      key: "ellipsis",
      onClick: handleClickExpand
    })], _toConsumableArray(allItems.slice(allItems.length - itemsAfterCollapse, allItems.length)));
  };

  var allItems = React.Children.toArray(children).filter(function (child) {
    return React.isValidElement(child);
  }).map(function (child, index) {
    return React.createElement("li", {
      className: classes.li,
      key: "child-".concat(index)
    }, child);
  });
  return React.createElement(Typography, _extends({
    ref: ref,
    component: Component,
    color: "textSecondary",
    className: clsx(classes.root, className)
  }, other), React.createElement("ol", {
    className: classes.ol
  }, insertSeparators(expanded || maxItems && allItems.length <= maxItems ? allItems : renderItemsBeforeAndAfter(allItems), classes.separator, separator)));
});
process.env.NODE_ENV !== "production" ? Breadcrumbs.propTypes = {
  /**
   * The breadcrumb children.
   */
  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 component used for the root node.
   * Either a string to use a DOM element or a component.
   * By default, it maps the variant to a good default headline component.
   */
  component: PropTypes.elementType,

  /**
   * If max items is exceeded, the number of items to show after the ellipsis.
   */
  itemsAfterCollapse: PropTypes.number,

  /**
   * If max items is exceeded, the number of items to show before the ellipsis.
   */
  itemsBeforeCollapse: PropTypes.number,

  /**
   * Specifies the maximum number of breadcrumbs to display. When there are more
   * than the maximum number, only the first and last will be shown, with an
   * ellipsis in between.
   */
  maxItems: PropTypes.number,

  /**
   * Custom separator node.
   */
  separator: PropTypes.node
} : void 0;
export default withStyles(styles, {
  name: 'MuiBreadcrumbs'
})(Breadcrumbs);