@patternfly/react-core
Version:
This library provides a set of common React components for use with the PatternFly reference implementation.
96 lines • 4.92 kB
JavaScript
import { __rest } from "tslib";
import * as React from 'react';
import styles from '@patternfly/react-styles/css/components/Nav/nav';
import { css } from '@patternfly/react-styles';
import AngleLeftIcon from '@patternfly/react-icons/dist/esm/icons/angle-left-icon';
import AngleRightIcon from '@patternfly/react-icons/dist/esm/icons/angle-right-icon';
import { isElementInView } from '../../helpers/util';
import { NavContext } from './Nav';
import { PageSidebarContext } from '../Page/PageSidebar';
import { getResizeObserver } from '../../helpers/resizeObserver';
export class NavList extends React.Component {
constructor() {
super(...arguments);
this.state = {
scrollViewAtStart: false,
scrollViewAtEnd: false
};
this.navList = React.createRef();
this.observer = () => { };
this.handleScrollButtons = () => {
const container = this.navList.current;
if (container) {
// check if it elements are in view
const scrollViewAtStart = isElementInView(container, container.firstChild, false);
const scrollViewAtEnd = isElementInView(container, container.lastChild, false);
this.setState({
scrollViewAtStart,
scrollViewAtEnd
});
this.context.updateIsScrollable(!scrollViewAtStart || !scrollViewAtEnd);
}
};
this.scrollLeft = () => {
// find first Element that is fully in view on the left, then scroll to the element before it
const container = this.navList.current;
if (container) {
const childrenArr = Array.from(container.children);
let firstElementInView;
let lastElementOutOfView;
for (let i = 0; i < childrenArr.length && !firstElementInView; i++) {
if (isElementInView(container, childrenArr[i], false)) {
firstElementInView = childrenArr[i];
lastElementOutOfView = childrenArr[i - 1];
}
}
if (lastElementOutOfView) {
container.scrollLeft -= lastElementOutOfView.scrollWidth;
}
this.handleScrollButtons();
}
};
this.scrollRight = () => {
// find last Element that is fully in view on the right, then scroll to the element after it
const container = this.navList.current;
if (container) {
const childrenArr = Array.from(container.children);
let lastElementInView;
let firstElementOutOfView;
for (let i = childrenArr.length - 1; i >= 0 && !lastElementInView; i--) {
if (isElementInView(container, childrenArr[i], false)) {
lastElementInView = childrenArr[i];
firstElementOutOfView = childrenArr[i + 1];
}
}
if (firstElementOutOfView) {
container.scrollLeft += firstElementOutOfView.scrollWidth;
}
this.handleScrollButtons();
}
};
}
componentDidMount() {
this.observer = getResizeObserver(this.navList.current, this.handleScrollButtons);
this.handleScrollButtons();
}
componentWillUnmount() {
this.observer();
}
render() {
const _a = this.props, { children, className, ariaLeftScroll, ariaRightScroll } = _a, props = __rest(_a, ["children", "className", "ariaLeftScroll", "ariaRightScroll"]);
const { scrollViewAtStart, scrollViewAtEnd } = this.state;
return (React.createElement(NavContext.Consumer, null, ({ isHorizontal }) => (React.createElement(PageSidebarContext.Consumer, null, ({ isNavOpen }) => (React.createElement(React.Fragment, null,
isHorizontal && (React.createElement("button", { className: css(styles.navScrollButton), "aria-label": ariaLeftScroll, onClick: this.scrollLeft, disabled: scrollViewAtStart, tabIndex: isNavOpen ? null : -1 },
React.createElement(AngleLeftIcon, null))),
React.createElement("ul", Object.assign({ ref: this.navList, className: css(styles.navList, className), onScroll: this.handleScrollButtons }, props), children),
isHorizontal && (React.createElement("button", { className: css(styles.navScrollButton), "aria-label": ariaRightScroll, onClick: this.scrollRight, disabled: scrollViewAtEnd, tabIndex: isNavOpen ? null : -1 },
React.createElement(AngleRightIcon, null)))))))));
}
}
NavList.displayName = 'NavList';
NavList.contextType = NavContext;
NavList.defaultProps = {
ariaLeftScroll: 'Scroll left',
ariaRightScroll: 'Scroll right'
};
//# sourceMappingURL=NavList.js.map