mirror of
https://github.com/element-hq/element-web.git
synced 2024-12-16 23:11:59 +03:00
6677a3f20e
Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>
107 lines
3.7 KiB
JavaScript
107 lines
3.7 KiB
JavaScript
/*
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Copyright 2019 Tulir Asokan <tulir@maunium.net>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import React from 'react';
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import PropTypes from 'prop-types';
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import classNames from "classnames";
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import {_t} from "../../../languageHandler";
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import {Key} from "../../../Keyboard";
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class Header extends React.PureComponent {
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static propTypes = {
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categories: PropTypes.arrayOf(PropTypes.object).isRequired,
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onAnchorClick: PropTypes.func.isRequired,
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};
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findNearestEnabled(index, delta) {
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index += this.props.categories.length;
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const cats = [...this.props.categories, ...this.props.categories, ...this.props.categories];
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while (index < cats.length && index >= 0) {
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if (cats[index].enabled) return index % this.props.categories.length;
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index += delta > 0 ? 1 : -1;
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}
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}
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changeCategoryRelative(delta) {
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const current = this.props.categories.findIndex(c => c.visible);
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this.changeCategoryAbsolute(current + delta, delta);
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}
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changeCategoryAbsolute(index, delta=1) {
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const category = this.props.categories[this.findNearestEnabled(index, delta)];
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if (category) {
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this.props.onAnchorClick(category.id);
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category.ref.current.focus();
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}
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}
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// Implements ARIA Tabs with Automatic Activation pattern
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// https://www.w3.org/TR/wai-aria-practices/examples/tabs/tabs-1/tabs.html
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onKeyDown = (ev) => {
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let handled = true;
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switch (ev.key) {
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case Key.ARROW_LEFT:
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this.changeCategoryRelative(-1);
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break;
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case Key.ARROW_RIGHT:
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this.changeCategoryRelative(1);
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break;
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case Key.HOME:
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this.changeCategoryAbsolute(0);
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break;
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case Key.END:
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this.changeCategoryAbsolute(this.props.categories.length - 1, -1);
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break;
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default:
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handled = false;
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}
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if (handled) {
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ev.preventDefault();
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ev.stopPropagation();
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}
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};
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render() {
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return (
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<nav className="mx_EmojiPicker_header" role="tablist" aria-label={_t("Categories")} onKeyDown={this.onKeyDown}>
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{this.props.categories.map(category => {
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const classes = classNames(`mx_EmojiPicker_anchor mx_EmojiPicker_anchor_${category.id}`, {
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mx_EmojiPicker_anchor_visible: category.visible,
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});
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// Properties of this button are also modified by EmojiPicker's updateVisibility in DOM.
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return <button
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disabled={!category.enabled}
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key={category.id}
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ref={category.ref}
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className={classes}
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onClick={() => this.props.onAnchorClick(category.id)}
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title={category.name}
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role="tab"
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tabIndex={category.visible ? 0 : -1} // roving
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aria-selected={category.visible}
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aria-controls={`mx_EmojiPicker_category_${category.id}`}
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/>;
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})}
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</nav>
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);
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}
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}
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export default Header;
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