4cfc155560
* feat(aria): Add aria-labels to underlabelled tab nav items The drawer tabs which control primary navigation are only labelled by a title which is not available to many screenreaders. Add an aria-label attribute to each link to improve readability with screenreaders. Organize link attributes so link target is first followed by classname. Issue #1349 * feat(aria): Replace abstract aria role of section with region Abstract aria roles such as section should not be used in content. Use non-abstract 'region' aria role instead. That role expects an aria-labelledby attribute with an id. Pass an ID to the column header. Remove the aria-label attribute on the ColumnHeader because the same value is output in plaintext as its child. Issue #1349 * fix(aria): Remove aria-controls attribute until solution is found Columns do not have wrappers, so these icons can't point to a column wrapper which it controls. Instead these icons function as triggers to show or hide individual columns. #1349 * fix(typo): Remove type of aria-labelledby instead of aria-label
83 lines
2 KiB
JavaScript
83 lines
2 KiB
JavaScript
import ColumnHeader from './column_header';
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import PropTypes from 'prop-types';
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const easingOutQuint = (x, t, b, c, d) => c*((t=t/d-1)*t*t*t*t + 1) + b;
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const scrollTop = (node) => {
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const startTime = Date.now();
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const offset = node.scrollTop;
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const targetY = -offset;
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const duration = 1000;
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let interrupt = false;
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const step = () => {
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const elapsed = Date.now() - startTime;
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const percentage = elapsed / duration;
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if (percentage > 1 || interrupt) {
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return;
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}
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node.scrollTop = easingOutQuint(0, elapsed, offset, targetY, duration);
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requestAnimationFrame(step);
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};
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step();
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return () => {
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interrupt = true;
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};
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};
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class Column extends React.PureComponent {
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constructor (props, context) {
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super(props, context);
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this.handleHeaderClick = this.handleHeaderClick.bind(this);
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this.handleWheel = this.handleWheel.bind(this);
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}
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handleHeaderClick () {
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const scrollable = ReactDOM.findDOMNode(this).querySelector('.scrollable');
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if (!scrollable) {
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return;
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}
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this._interruptScrollAnimation = scrollTop(scrollable);
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}
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handleWheel () {
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if (typeof this._interruptScrollAnimation !== 'undefined') {
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this._interruptScrollAnimation();
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}
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}
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render () {
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const { heading, icon, children, active, hideHeadingOnMobile } = this.props;
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let columnHeaderId = null
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let header = '';
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if (heading) {
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columnHeaderId = heading.replace(/ /g, '-')
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header = <ColumnHeader icon={icon} active={active} type={heading} onClick={this.handleHeaderClick} hideOnMobile={hideHeadingOnMobile} columnHeaderId={columnHeaderId}/>;
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}
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return (
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<div role='region' aria-labelledby={columnHeaderId} className='column' onWheel={this.handleWheel}>
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{header}
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{children}
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</div>
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);
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}
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}
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Column.propTypes = {
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heading: PropTypes.string,
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icon: PropTypes.string,
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children: PropTypes.node,
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active: PropTypes.bool,
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hideHeadingOnMobile: PropTypes.bool
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};
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export default Column;
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