Merge pull request #518 from orangemug/fix/color-accessibility-ua-switch

Toggle color accessibility based on user agent

src/components/Toolbar.jsx

@@ -1,6 +1,7 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 import classnames from 'classnames'
+import {detect} from 'detect-browser';
 
 import {MdFileDownload, MdOpenInBrowser, MdSettings, MdLayers, MdHelpOutline, MdFindInPage, MdAssignmentTurnedIn} from 'react-icons/md'
 
@@ -9,6 +10,11 @@ import logoImage from 'maputnik-design/logos/logo-color.svg'
 import pkgJson from '../../package.json'
 
 
+// This is required because of <https://stackoverflow.com/a/49846426>, there isn't another way to detect support that I'm aware of.
+const browser = detect();
+const colorAccessibilityFiltersEnabled = ['chrome', 'firefox'].indexOf(browser.name) > -1;
+
+
 class IconText extends React.Component {
   static propTypes = {
     children: PropTypes.node,
@@ -137,18 +143,22 @@ export default class Toolbar extends React.Component {
       {
         id: "filter-deuteranopia",
         title: "Map (deuteranopia)",
+        disabled: !colorAccessibilityFiltersEnabled,
       },
       {
         id: "filter-protanopia",
         title: "Map (protanopia)",
+        disabled: !colorAccessibilityFiltersEnabled,
       },
       {
         id: "filter-tritanopia",
         title: "Map (tritanopia)",
+        disabled: !colorAccessibilityFiltersEnabled,
       },
       {
         id: "filter-achromatopsia",
         title: "Map (achromatopsia)",
+        disabled: !colorAccessibilityFiltersEnabled,
       },
     ];
 
@@ -201,7 +211,7 @@ export default class Toolbar extends React.Component {
             <select onChange={(e) => this.handleSelection(e.target.value)} value={currentView.id}>
               {views.map((item) => {
                 return (
-                  <option key={item.id} value={item.id}>
+                  <option key={item.id} value={item.id} disabled={item.disabled}>
                     {item.title}
                   </option>
                 );