106 lines
3.4 KiB
JavaScript
106 lines
3.4 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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* Handling for Windows High Contrast Mode.
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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 H from '../Core/Globals.js';
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const { doc, isMS, win } = H;
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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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* Detect WHCM in the browser.
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*
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* @function Highcharts#isHighContrastModeActive
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* @private
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* @return {boolean} Returns true if the browser is in High Contrast mode.
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*/
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function isHighContrastModeActive() {
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// Use media query on Edge, but not on IE
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const isEdge = /(Edg)/.test(win.navigator.userAgent);
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if (win.matchMedia && isEdge) {
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return win.matchMedia('(-ms-high-contrast: active)').matches;
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}
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// Test BG image for IE
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if (isMS && win.getComputedStyle) {
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const testDiv = doc.createElement('div');
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const imageSrc = 'data:image/gif;base64,' +
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'R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
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testDiv.style.backgroundImage = `url(${imageSrc})`; // #13071
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doc.body.appendChild(testDiv);
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const bi = (testDiv.currentStyle ||
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win.getComputedStyle(testDiv)).backgroundImage;
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doc.body.removeChild(testDiv);
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return bi === 'none';
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}
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// Other browsers use the forced-colors standard
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return win.matchMedia && win.matchMedia('(forced-colors: active)').matches;
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}
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/**
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* Force high contrast theme for the chart. The default theme is defined in
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* a separate file.
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*
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* @function Highcharts#setHighContrastTheme
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* @private
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* @param {Highcharts.AccessibilityChart} chart The chart to set the theme of.
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* @return {void}
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*/
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function setHighContrastTheme(chart) {
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// We might want to add additional functionality here in the future for
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// storing the old state so that we can reset the theme if HC mode is
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// disabled. For now, the user will have to reload the page.
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chart.highContrastModeActive = true;
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// Apply theme to chart
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const theme = (chart.options.accessibility.highContrastTheme);
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chart.update(theme, false);
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const hasCustomColors = theme.colors?.length > 1;
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// Force series colors (plotOptions is not enough)
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chart.series.forEach(function (s) {
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const plotOpts = theme.plotOptions[s.type] || {};
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const fillColor = hasCustomColors && s.colorIndex !== void 0 ?
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theme.colors[s.colorIndex] :
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plotOpts.color || 'window';
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const seriesOptions = {
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color: plotOpts.color || 'windowText',
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colors: hasCustomColors ?
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theme.colors : [plotOpts.color || 'windowText'],
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borderColor: plotOpts.borderColor || 'window',
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fillColor
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};
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s.update(seriesOptions, false);
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if (s.points) {
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// Force point colors if existing
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s.points.forEach(function (p) {
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if (p.options && p.options.color) {
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p.update({
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color: plotOpts.color || 'windowText',
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borderColor: plotOpts.borderColor || 'window'
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}, false);
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}
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});
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}
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});
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// The redraw for each series and after is required for 3D pie
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// (workaround)
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chart.redraw();
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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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const whcm = {
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isHighContrastModeActive,
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setHighContrastTheme
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};
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export default whcm;
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