116 lines
4.2 KiB
TypeScript
116 lines
4.2 KiB
TypeScript
/*
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Copyright 2019 Tulir Asokan <tulir@maunium.net>
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Copyright 2020 The Matrix.org Foundation C.I.C.
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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 classNames from "classnames";
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import { _t } from "../../../languageHandler";
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import { CategoryKey, ICategory } from "./Category";
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import { getKeyBindingsManager } from "../../../KeyBindingsManager";
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import { KeyBindingAction } from "../../../accessibility/KeyboardShortcuts";
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interface IProps {
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categories: ICategory[];
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onAnchorClick(id: CategoryKey): void;
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}
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class Header extends React.PureComponent<IProps> {
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private findNearestEnabled(index: number, delta: number) {
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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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private changeCategoryRelative(delta: number) {
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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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private changeCategoryAbsolute(index: number, 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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private onKeyDown = (ev: React.KeyboardEvent) => {
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let handled = true;
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const action = getKeyBindingsManager().getAccessibilityAction(ev);
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switch (action) {
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case KeyBindingAction.ArrowLeft:
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this.changeCategoryRelative(-1);
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break;
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case KeyBindingAction.ArrowRight:
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this.changeCategoryRelative(1);
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break;
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case KeyBindingAction.Home:
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this.changeCategoryAbsolute(0);
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break;
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case KeyBindingAction.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
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className="mx_EmojiPicker_header"
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role="tablist"
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aria-label={_t("Categories")}
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onKeyDown={this.onKeyDown}
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>
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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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