@wordpress/block-editor/build-module/components/contrast-checker/index.native.js

Generic block editor.

import { createElement } from "@wordpress/element";

/**
 * External dependencies
 */
import { Text, View } from 'react-native';
import { colord, extend } from 'colord';
import namesPlugin from 'colord/plugins/names';
import a11yPlugin from 'colord/plugins/a11y';
/**
 * WordPress dependencies
 */

import { speak } from '@wordpress/a11y';
import { __ } from '@wordpress/i18n';
import { useEffect } from '@wordpress/element';
import { usePreferredColorSchemeStyle } from '@wordpress/compose';
import { Icon, warning } from '@wordpress/icons';
/**
 * Internal dependencies
 */

import styles from './style.scss';
extend([namesPlugin, a11yPlugin]);

function ContrastCheckerMessage({
  colordBackgroundColor,
  colordTextColor,
  backgroundColor,
  textColor,
  msgStyle
}) {
  const msg = colordBackgroundColor.brightness() < colordTextColor.brightness() ? __('This color combination may be hard for people to read. Try using a darker background color and/or a brighter text color.') : __('This color combination may be hard for people to read. Try using a brighter background color and/or a darker text color.'); // Note: The `Notice` component can speak messages via its `spokenMessage`
  // prop, but the contrast checker requires granular control over when the
  // announcements are made. Notably, the message will be re-announced if a
  // new color combination is selected and the contrast is still insufficient.

  useEffect(() => {
    speak(__('This color combination may be hard for people to read.'));
  }, [backgroundColor, textColor]);
  const iconStyle = usePreferredColorSchemeStyle(styles['block-editor-contrast-checker__icon'], styles['block-editor-contrast-checker__icon-dark']);
  return createElement(View, {
    style: styles['block-editor-contrast-checker']
  }, createElement(Icon, {
    style: iconStyle,
    icon: warning
  }), createElement(Text, {
    style: msgStyle
  }, msg));
}

function ContrastChecker({
  backgroundColor,
  fallbackBackgroundColor,
  fallbackTextColor,
  fontSize,
  // font size value in pixels
  isLargeText,
  textColor
}) {
  const msgStyle = usePreferredColorSchemeStyle(styles['block-editor-contrast-checker__notice'], styles['block-editor-contrast-checker__notice-dark']);

  if (!(backgroundColor || fallbackBackgroundColor) || !(textColor || fallbackTextColor)) {
    return null;
  }

  const colordBackgroundColor = colord(backgroundColor || fallbackBackgroundColor);
  const colordTextColor = colord(textColor || fallbackTextColor);
  const hasTransparency = colordBackgroundColor.alpha() !== 1 || colordTextColor.alpha() !== 1;

  if (hasTransparency || colordTextColor.isReadable(colordBackgroundColor, {
    level: 'AA',
    size: isLargeText || isLargeText !== false && fontSize >= 24 ? 'large' : 'small'
  })) {
    return null;
  }

  return createElement(ContrastCheckerMessage, {
    backgroundColor: backgroundColor,
    textColor: textColor,
    colordBackgroundColor: colordBackgroundColor,
    colordTextColor: colordTextColor,
    msgStyle: msgStyle
  });
}

export default ContrastChecker;
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