1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 | 1x 3x 3x 3x 3x 3x 3x 6x 6x 6x 6x 1x | import styles from './style.postcss'; import React, { PureComponent } from 'react'; import { Link } from 'react-router'; import ReactGA from 'react-ga'; import is from 'is_js'; import classnames from 'classnames'; import debounce from 'lodash.debounce'; import Icon from 'components/Icon'; import PropTypes from 'prop-types'; import testClass from 'domain/testClass'; const RESIZE_DEBOUNCE_MS = 100; class Breadcrumbs extends PureComponent { constructor() { super(); this.state = { isIntermediateCrumbsCollapsed: false, collapsedAtWidth: null, // populated below }; } componentDidMount() { this._updateIntermediateCrumbsCollapsedState(); window.addEventListener('resize', this.onResizeHandler = debounce(() => { this._updateIntermediateCrumbsCollapsedState(); }, RESIZE_DEBOUNCE_MS, { leading: true, // nicer iOS screen rotate trailing: true, }), false); } componentDidUpdate() { this._updateIntermediateCrumbsCollapsedState(); } componentWillUnmount() { if (! this.onResizeHandler) return; window.removeEventListener('resize', this.onResizeHandler); } _isOverflowingHorizontally() { // returns: content width (if overflowing) const el = this.listNode; const curOverflow = el.style.overflow; // set overflows: ul hidden, children visible if (! curOverflow || curOverflow === 'visible') { el.style.overflow = 'hidden'; } const childOverflows = []; Array.prototype.forEach.call(el.children, (childEl) => { childOverflows.push(childEl.style.overflow); childEl.style.overflow = 'visible'; // eslint-disable-line }); // check clientWidth against scrollWidth; scrollWidth is the width of content const isOverflowing = el.clientWidth < el.scrollWidth; const { scrollWidth } = el; // restore overflow el.style.overflow = curOverflow; Array.prototype.forEach.call(el.children, (childEl) => { childEl.style.overflow = childOverflows.shift(); // eslint-disable-line }); return isOverflowing && scrollWidth; } _updateIntermediateCrumbsCollapsedState() { if (! this.props.singleLineMode || ! this.listNode) return; const navBoxSizing = this.navNode.style.boxSizing; this.navNode.style.boxSizing = 'content-box'; // to get width without padding const navWidth = Number.parseInt( getComputedStyle(this.navNode) .getPropertyValue('width') , 10); this.navNode.style.boxSizing = navBoxSizing; // restore let contentWidth; if (this.state.isIntermediateCrumbsCollapsed && (is.not.number(this.state.collapsedAtWidth) || navWidth > this.state.collapsedAtWidth)) { this.setState({ isIntermediateCrumbsCollapsed: false, collapsedAtWidth: null, }); } else if (! this.state.isIntermediateCrumbsCollapsed && // eslint-disable-line (contentWidth = this._isOverflowingHorizontally())) { // overflowing - collapse intermediate crumbs this.setState({ isIntermediateCrumbsCollapsed: true, collapsedAtWidth: navWidth > this.state.collapsedAtWidth || is.not.number(this.state.collapsedAtWidth) ? contentWidth : this.state.collapsedAtWidth, }); } } _onLinkClick(linkLabel) { ReactGA.event({ category: 'Navigation', action: 'Clicked breadcrumb', label: `Clicked breadcrumb ${linkLabel}`, }); } render() { Iif (! this.props.items || this.props.items.length < 1) return null; // make a copy of props.items so that we can mangle it let itemsToRender = this.props.items; // push collapsed intermediate crumbs if enabled Iif (this.state.isIntermediateCrumbsCollapsed) { itemsToRender = [this.props.items[0]]; if (this.props.items.length > 2) { itemsToRender.push({ label: '…', clickable: false, }); } itemsToRender.push(this.props.items[this.props.items.length - 1]); } return <nav className={classnames(styles.Breadcrumbs, this.props.className, { [styles.__wrap]: ! this.props.singleLineMode, })}> <ul className={styles.Breadcrumbs_list} ref={(_node) => { if (! _node) return; this.listNode = _node; this.navNode = _node.parentElement; }}> { itemsToRender.length === 0 ? null : <li className={classnames(styles.Breadcrumbs_crumb, styles.__clickable, testClass('crumb-home'))}> <Link to="/" onClick={() => this._onLinkClick('Home button')} draggable={false}> <Icon id="home" /> </Link> </li> } {itemsToRender.map((item, idx) => { const indexedCrumbClassName = styles[`Breadcrumbs_crumb_${idx}`]; const itemClassNames = classnames(styles.Breadcrumbs_crumb, { [indexedCrumbClassName]: !! indexedCrumbClassName, [styles.__clickable]: !! item.clickable, }); const itemKey = item.label + item.href; return <li key={itemKey} className={itemClassNames}> {item.clickable ? <Link to={item.href} onClick={() => this._onLinkClick(item.label)} draggable={false}> {item.label} </Link> : <span> {item.label} </span>} </li>; })} </ul> </nav>; } } Breadcrumbs.propTypes = { className: PropTypes.string, items: PropTypes.arrayOf(PropTypes.shape({ label: PropTypes.string.isRequired, href: PropTypes.string.isRequired, clickable: PropTypes.bool.isRequired, backLinkHref: PropTypes.string, // it's an override })).isRequired, singleLineMode: PropTypes.bool, }; export default Breadcrumbs; |