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@dabapps/roe

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A Collection of React Components for Project Development

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<!doctype html> <html lang="en"> <head> <title>Code coverage report for ts/components/navigation/nav-bar.tsx</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../../../prettify.css" /> <link rel="stylesheet" href="../../../base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(../../../sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1> <a href="../../../index.html">All files</a> / <a href="index.html">ts/components/navigation</a> nav-bar.tsx </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> <span class="strong">100% </span> <span class="quiet">Statements</span> <span class='fraction'>50/50</span> </div> <div class='fl pad1y space-right2'> <span class="strong">100% </span> <span class="quiet">Branches</span> <span class='fraction'>32/32</span> </div> <div class='fl pad1y space-right2'> <span class="strong">100% 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addClassName, getScrollOffset, removeClassName } from '../../utils'; &nbsp; const WITH_FIXED_NAV_BAR = 'with-fixed-nav-bar'; &nbsp; export interface NavBarProps extends ComponentProps, HTMLProps&lt;HTMLElement&gt; { /** * Fix the navbar to the top of the screen */ fixed?: boolean; /** * Hide the navbar when scrolling down, but display when scrolling up */ shy?: boolean; /** * Remove NavBar shadow */ noShadow?: boolean; } &nbsp; export interface NavBarState { hidden: boolean; } &nbsp; export class NavBar extends PureComponent&lt;NavBarProps, NavBarState&gt; { private previousScrollY: number; &nbsp; public constructor (props: NavBarProps) { super(props); &nbsp; this.previousScrollY = getScrollOffset().y; &nbsp; this.state = { hidden: false, }; } &nbsp; public componentWillMount () { this.updateBodyClass(this.props); this.toggleShyListeners(this.props); } &nbsp; public componentWillUpdate (nextProps: NavBarProps) { if (this.props.shy !== nextProps.shy) { this.toggleShyListeners(nextProps); } &nbsp; if (this.props.fixed !== nextProps.fixed || this.props.shy !== nextProps.shy) { this.updateBodyClass(nextProps); } } &nbsp; public componentWillUnmount () { window.removeEventListener('scroll', this.hideOrShowNavBar); window.removeEventListener('resize', this.hideOrShowNavBar); } &nbsp; public render () { const { children, className, fixed, shy, noShadow, component: Component = 'div', ...remainingProps, } = this.props; &nbsp; const { hidden, } = this.state; &nbsp; const myClassNames = [ 'nav-bar', fixed || shy ? 'fixed' : null, shy ? 'shy' : null, hidden ? 'hidden' : null, noShadow ? 'no-shadow' : null, className ]; &nbsp; return ( &lt;Component {...remainingProps} className={classNames(myClassNames)}&gt; {children} &lt;/Component&gt; ); } &nbsp; private updateBodyClass (props: NavBarProps) { const { fixed, shy } = props; &nbsp; if (fixed || shy) { addClassName(document.body, WITH_FIXED_NAV_BAR); } else { removeClassName(document.body, WITH_FIXED_NAV_BAR) } } &nbsp; private toggleShyListeners (props: NavBarProps) { const { shy } = props; &nbsp; if (shy) { window.addEventListener('scroll', this.hideOrShowNavBar); window.addEventListener('resize', this.hideOrShowNavBar); } else { window.removeEventListener('scroll', this.hideOrShowNavBar); window.removeEventListener('resize', this.hideOrShowNavBar); } } &nbsp; private hideOrShowNavBar = () =&gt; { const { y } = getScrollOffset(); const element = ReactDOM.findDOMNode(this); &nbsp; if (element) { const { height } = element.getBoundingClientRect(); &nbsp; if (y &gt; this.previousScrollY &amp;&amp; y &gt; height) { this.setState({ hidden: true, }); } else if (y &lt; this.previousScrollY) { this.setState({ hidden: false, }); } } &nbsp; this.previousScrollY = y; } } &nbsp; export default NavBar; &nbsp;</pre></td></tr> </table></pre> <div class='push'></div><!-- for sticky footer --> </div><!-- /wrapper --> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="https://istanbul.js.org/" target="_blank">istanbul</a> at Tue Sep 18 2018 23:45:15 GMT+0100 (BST) </div> </div> <script src="../../../prettify.js"></script> <script> window.onload = function () { if (typeof prettyPrint === 'function') { prettyPrint(); } }; </script> <script src="../../../sorter.js"></script> </body> </html>