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/* *
*
* (c) 2009-2021 Øystein Moseng
*
* Handling for Windows High Contrast Mode.
*
* License: www.highcharts.com/license
*
* !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
*
* */
'use strict';
import H from '../Core/Globals.js';
var doc = H.doc, isMS = H.isMS, win = H.win;
/* *
*
* Functions
*
* */
/**
* Detect WHCM in the browser.
*
* @function Highcharts#isHighContrastModeActive
* @private
* @return {boolean} Returns true if the browser is in High Contrast mode.
*/
function isHighContrastModeActive() {
// Use media query on Edge, but not on IE
var isEdge = /(Edg)/.test(win.navigator.userAgent);
if (win.matchMedia && isEdge) {
return win.matchMedia('(-ms-high-contrast: active)').matches;
}
// Test BG image for IE
if (isMS && win.getComputedStyle) {
var testDiv = doc.createElement('div');
var imageSrc = 'data:image/gif;base64,' +
'R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
testDiv.style.backgroundImage = "url(".concat(imageSrc, ")"); // #13071
doc.body.appendChild(testDiv);
var bi = (testDiv.currentStyle ||
win.getComputedStyle(testDiv)).backgroundImage;
doc.body.removeChild(testDiv);
return bi === 'none';
}
// Other browsers use the forced-colors standard
return win.matchMedia && win.matchMedia('(forced-colors: active)').matches;
}
/**
* Force high contrast theme for the chart. The default theme is defined in
* a separate file.
*
* @function Highcharts#setHighContrastTheme
* @private
* @param {Highcharts.AccessibilityChart} chart The chart to set the theme of.
* @return {void}
*/
function setHighContrastTheme(chart) {
// We might want to add additional functionality here in the future for
// storing the old state so that we can reset the theme if HC mode is
// disabled. For now, the user will have to reload the page.
chart.highContrastModeActive = true;
// Apply theme to chart
var theme = (chart.options.accessibility.highContrastTheme);
chart.update(theme, false);
// Force series colors (plotOptions is not enough)
chart.series.forEach(function (s) {
var plotOpts = theme.plotOptions[s.type] || {};
s.update({
color: plotOpts.color || 'windowText',
colors: [plotOpts.color || 'windowText'],
borderColor: plotOpts.borderColor || 'window'
});
// Force point colors if existing
s.points.forEach(function (p) {
if (p.options && p.options.color) {
p.update({
color: plotOpts.color || 'windowText',
borderColor: plotOpts.borderColor || 'window'
}, false);
}
});
});
// The redraw for each series and after is required for 3D pie
// (workaround)
chart.redraw();
}
/* *
*
* Default Export
*
* */
var whcm = {
isHighContrastModeActive: isHighContrastModeActive,
setHighContrastTheme: setHighContrastTheme
};
export default whcm;
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