391 lines
12 KiB
JavaScript
391 lines
12 KiB
JavaScript
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/* *
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*
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* (c) 2009-2024 Øystein Moseng
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*
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* Accessibility module for Highcharts
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*
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* License: www.highcharts.com/license
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*
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* !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
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*
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* */
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'use strict';
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import D from '../Core/Defaults.js';
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const { defaultOptions } = D;
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import H from '../Core/Globals.js';
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const { doc } = H;
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import U from '../Core/Utilities.js';
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const { addEvent, extend, fireEvent, merge } = U;
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import HU from './Utils/HTMLUtilities.js';
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const { removeElement } = HU;
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import A11yI18n from './A11yI18n.js';
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import ContainerComponent from './Components/ContainerComponent.js';
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import FocusBorderComposition from './FocusBorder.js';
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import InfoRegionsComponent from './Components/InfoRegionsComponent.js';
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import KeyboardNavigation from './KeyboardNavigation.js';
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import LegendComponent from './Components/LegendComponent.js';
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import MenuComponent from './Components/MenuComponent.js';
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import NavigatorComponent from './Components/NavigatorComponent.js';
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import NewDataAnnouncer from './Components/SeriesComponent/NewDataAnnouncer.js';
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import ProxyProvider from './ProxyProvider.js';
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import RangeSelectorComponent from './Components/RangeSelectorComponent.js';
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import SeriesComponent from './Components/SeriesComponent/SeriesComponent.js';
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import ZoomComponent from './Components/ZoomComponent.js';
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import whcm from './HighContrastMode.js';
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import highContrastTheme from './HighContrastTheme.js';
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import defaultOptionsA11Y from './Options/A11yDefaults.js';
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import defaultLangOptions from './Options/LangDefaults.js';
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import copyDeprecatedOptions from './Options/DeprecatedOptions.js';
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/* *
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*
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* Class
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*
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* */
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/**
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* The Accessibility class
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*
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* @private
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* @requires module:modules/accessibility
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*
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* @class
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* @name Highcharts.Accessibility
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*
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* @param {Highcharts.Chart} chart
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* Chart object
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*/
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class Accessibility {
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/* *
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*
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* Constructor
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*
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* */
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constructor(chart) {
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this.init(chart);
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}
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/* *
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*
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* Functions
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*
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* */
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/**
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* Initialize the accessibility class
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* @private
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* @param {Highcharts.Chart} chart
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* Chart object
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*/
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init(chart) {
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this.chart = chart;
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// Abort on old browsers
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if (!doc.addEventListener) {
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this.zombie = true;
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this.components = {};
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chart.renderTo.setAttribute('aria-hidden', true);
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return;
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}
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// Copy over any deprecated options that are used. We could do this on
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// every update, but it is probably not needed.
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copyDeprecatedOptions(chart);
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this.proxyProvider = new ProxyProvider(this.chart);
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this.initComponents();
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this.keyboardNavigation = new KeyboardNavigation(chart, this.components);
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}
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/**
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* @private
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*/
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initComponents() {
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const chart = this.chart;
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const proxyProvider = this.proxyProvider;
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const a11yOptions = chart.options.accessibility;
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this.components = {
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container: new ContainerComponent(),
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infoRegions: new InfoRegionsComponent(),
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legend: new LegendComponent(),
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chartMenu: new MenuComponent(),
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rangeSelector: new RangeSelectorComponent(),
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series: new SeriesComponent(),
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zoom: new ZoomComponent(),
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navigator: new NavigatorComponent()
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};
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if (a11yOptions.customComponents) {
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extend(this.components, a11yOptions.customComponents);
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}
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const components = this.components;
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this.getComponentOrder().forEach(function (componentName) {
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components[componentName].initBase(chart, proxyProvider);
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components[componentName].init();
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});
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}
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/**
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* Get order to update components in.
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* @private
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*/
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getComponentOrder() {
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if (!this.components) {
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return []; // For zombie accessibility object on old browsers
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}
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if (!this.components.series) {
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return Object.keys(this.components);
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}
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const componentsExceptSeries = Object.keys(this.components)
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.filter((c) => c !== 'series');
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// Update series first, so that other components can read accessibility
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// info on points.
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return ['series'].concat(componentsExceptSeries);
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}
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/**
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* Update all components.
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*/
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update() {
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const components = this.components, chart = this.chart, a11yOptions = chart.options.accessibility;
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fireEvent(chart, 'beforeA11yUpdate');
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// Update the chart type list as this is used by multiple modules
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chart.types = this.getChartTypes();
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// Update proxies. We don't update proxy positions since most likely we
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// need to recreate the proxies on update.
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const kbdNavOrder = a11yOptions.keyboardNavigation.order;
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this.proxyProvider.updateGroupOrder(kbdNavOrder);
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// Update markup
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this.getComponentOrder().forEach(function (componentName) {
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components[componentName].onChartUpdate();
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fireEvent(chart, 'afterA11yComponentUpdate', {
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name: componentName,
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component: components[componentName]
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});
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});
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// Update keyboard navigation
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this.keyboardNavigation.update(kbdNavOrder);
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// Handle high contrast mode
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// Should only be applied once, and not if explicitly disabled
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if (!chart.highContrastModeActive &&
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a11yOptions.highContrastMode !== false && (whcm.isHighContrastModeActive() ||
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a11yOptions.highContrastMode === true)) {
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whcm.setHighContrastTheme(chart);
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}
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fireEvent(chart, 'afterA11yUpdate', {
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accessibility: this
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});
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}
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/**
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* Destroy all elements.
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*/
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destroy() {
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const chart = this.chart || {};
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// Destroy components
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const components = this.components;
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Object.keys(components).forEach(function (componentName) {
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components[componentName].destroy();
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components[componentName].destroyBase();
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});
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// Destroy proxy provider
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if (this.proxyProvider) {
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this.proxyProvider.destroy();
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}
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// Remove announcer container
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if (chart.announcerContainer) {
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removeElement(chart.announcerContainer);
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}
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// Kill keyboard nav
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if (this.keyboardNavigation) {
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this.keyboardNavigation.destroy();
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}
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// Hide container from screen readers if it exists
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if (chart.renderTo) {
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chart.renderTo.setAttribute('aria-hidden', true);
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}
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// Remove focus border if it exists
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if (chart.focusElement) {
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chart.focusElement.removeFocusBorder();
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}
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}
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/**
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* Return a list of the types of series we have in the chart.
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* @private
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*/
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getChartTypes() {
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const types = {};
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this.chart.series.forEach(function (series) {
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types[series.type] = 1;
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});
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return Object.keys(types);
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}
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}
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/* *
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*
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* Class Namespace
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*
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* */
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(function (Accessibility) {
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/* *
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*
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* Declarations
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*
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* */
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/* *
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*
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* Constants
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*
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* */
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Accessibility.i18nFormat = A11yI18n.i18nFormat;
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/* *
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*
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* Functions
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*
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* */
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/**
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* Destroy with chart.
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* @private
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*/
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function chartOnDestroy() {
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if (this.accessibility) {
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this.accessibility.destroy();
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}
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}
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/**
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* Handle updates to the module and send render updates to components.
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* @private
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*/
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function chartOnRender() {
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// Update/destroy
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if (this.a11yDirty && this.renderTo) {
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delete this.a11yDirty;
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this.updateA11yEnabled();
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}
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const a11y = this.accessibility;
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if (a11y && !a11y.zombie) {
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a11y.proxyProvider.updateProxyElementPositions();
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a11y.getComponentOrder().forEach(function (componentName) {
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a11y.components[componentName].onChartRender();
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});
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}
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}
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/**
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* Update with chart/series/point updates.
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* @private
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*/
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function chartOnUpdate(e) {
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// Merge new options
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const newOptions = e.options.accessibility;
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if (newOptions) {
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// Handle custom component updating specifically
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if (newOptions.customComponents) {
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this.options.accessibility.customComponents =
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newOptions.customComponents;
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delete newOptions.customComponents;
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}
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merge(true, this.options.accessibility, newOptions);
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// Recreate from scratch
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if (this.accessibility && this.accessibility.destroy) {
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this.accessibility.destroy();
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delete this.accessibility;
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}
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}
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// Mark dirty for update
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this.a11yDirty = true;
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}
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/**
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* @private
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*/
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function chartUpdateA11yEnabled() {
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let a11y = this.accessibility;
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const accessibilityOptions = this.options.accessibility;
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if (accessibilityOptions && accessibilityOptions.enabled) {
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if (a11y && !a11y.zombie) {
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a11y.update();
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}
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else {
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this.accessibility = a11y = new Accessibility(this);
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if (a11y && !a11y.zombie) {
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a11y.update();
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}
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}
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}
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else if (a11y) {
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// Destroy if after update we have a11y and it is disabled
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if (a11y.destroy) {
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a11y.destroy();
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}
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delete this.accessibility;
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}
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else {
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// Just hide container
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this.renderTo.setAttribute('aria-hidden', true);
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}
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}
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/**
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* @private
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*/
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function compose(ChartClass, LegendClass, PointClass, SeriesClass, SVGElementClass, RangeSelectorClass) {
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// Ordered:
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KeyboardNavigation.compose(ChartClass);
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NewDataAnnouncer.compose(SeriesClass);
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LegendComponent.compose(ChartClass, LegendClass);
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MenuComponent.compose(ChartClass);
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SeriesComponent.compose(ChartClass, PointClass, SeriesClass);
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A11yI18n.compose(ChartClass);
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FocusBorderComposition.compose(ChartClass, SVGElementClass);
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// RangeSelector
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if (RangeSelectorClass) {
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RangeSelectorComponent.compose(ChartClass, RangeSelectorClass);
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}
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const chartProto = ChartClass.prototype;
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if (!chartProto.updateA11yEnabled) {
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chartProto.updateA11yEnabled = chartUpdateA11yEnabled;
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addEvent(ChartClass, 'destroy', chartOnDestroy);
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addEvent(ChartClass, 'render', chartOnRender);
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addEvent(ChartClass, 'update', chartOnUpdate);
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// Mark dirty for update
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['addSeries', 'init'].forEach((event) => {
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addEvent(ChartClass, event, function () {
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this.a11yDirty = true;
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});
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});
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// Direct updates (events happen after render)
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['afterApplyDrilldown', 'drillupall'].forEach((event) => {
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addEvent(ChartClass, event, function chartOnAfterDrilldown() {
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const a11y = this.accessibility;
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if (a11y && !a11y.zombie) {
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a11y.update();
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}
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});
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});
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addEvent(PointClass, 'update', pointOnUpdate);
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// Mark dirty for update
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['update', 'updatedData', 'remove'].forEach((event) => {
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addEvent(SeriesClass, event, function () {
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if (this.chart.accessibility) {
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this.chart.a11yDirty = true;
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}
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});
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});
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}
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}
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Accessibility.compose = compose;
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/**
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* Mark dirty for update.
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* @private
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*/
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function pointOnUpdate() {
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if (this.series.chart.accessibility) {
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this.series.chart.a11yDirty = true;
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}
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}
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})(Accessibility || (Accessibility = {}));
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/* *
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*
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* Registry
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*
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* */
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// Add default options
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merge(true, defaultOptions, defaultOptionsA11Y, {
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accessibility: {
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highContrastTheme: highContrastTheme
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},
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lang: defaultLangOptions
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});
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/* *
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*
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* Default Export
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*
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* */
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export default Accessibility;
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