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

Generic block editor.

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

/**
 * External dependencies
 */
import { colord, extend } from 'colord';
import namesPlugin from 'colord/plugins/names';
import a11yPlugin from 'colord/plugins/a11y';
/**
 * GeChiUI dependencies
 */

import { speak } from '@gechiui/a11y';
import { __ } from '@gechiui/i18n';
import { Notice } from '@gechiui/components';
import { useEffect } from '@gechiui/element';
extend([namesPlugin, a11yPlugin]);

function ContrastCheckerMessage(_ref) {
  let {
    colordBackgroundColor,
    colordTextColor,
    backgroundColor,
    textColor
  } = _ref;
  const msg = colordBackgroundColor.brightness() < colordTextColor.brightness() ? __('此颜色组合可能不便阅读，请改用较深的背景颜色搭配较浅的文本颜色。') : __('此颜色组合可能不便阅读，请改用较浅的背景颜色搭配较深的文本颜色。'); // 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(__('此颜色组合可能不便阅读。'));
  }, [backgroundColor, textColor]);
  return createElement("div", {
    className: "block-editor-contrast-checker"
  }, createElement(Notice, {
    spokenMessage: null,
    status: "warning",
    isDismissible: false
  }, msg));
}

function ContrastChecker(_ref2) {
  let {
    backgroundColor,
    fallbackBackgroundColor,
    fallbackTextColor,
    fontSize,
    // font size value in pixels
    isLargeText,
    textColor
  } = _ref2;

  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
  });
}

export default ContrastChecker;
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