@carbon/react/es/components/Theme/index.js

React components for the Carbon Design System

/**
 * Copyright IBM Corp. 2016, 2023
 *
 * This source code is licensed under the Apache-2.0 license found in the
 * LICENSE file in the root directory of this source tree.
 */

import { extends as _extends } from '../../_virtual/_rollupPluginBabelHelpers.js';
import cx from 'classnames';
import PropTypes from 'prop-types';
import React, { useMemo } from 'react';
import { usePrefix } from '../../internal/usePrefix.js';
import { LayerContext } from '../Layer/LayerContext.js';
import { useMatchMedia } from '../../internal/useMatchMedia.js';

const ThemeContext = /*#__PURE__*/React.createContext({
  theme: 'white'
});
const GlobalTheme = /*#__PURE__*/React.forwardRef(function GlobalTheme({
  children,
  theme
}, ref) {
  const value = useMemo(() => {
    return {
      theme
    };
  }, [theme]);
  const childrenWithProps = /*#__PURE__*/React.cloneElement(children, {
    ref: ref
  });
  return /*#__PURE__*/React.createElement(ThemeContext.Provider, {
    value: value
  }, childrenWithProps);
});
GlobalTheme.propTypes = {
  /**
   * Provide child elements to be rendered inside of `GlobalTheme`, this is
   * typically the root of your app
   */
  children: PropTypes.node,
  /**
   * Specify the global theme for your app
   */
  theme: PropTypes.oneOf(['white', 'g10', 'g90', 'g100'])
};
/**
 * Specify the theme to be applied to a page, or a region in a page
 */
function Theme({
  as: BaseComponent = 'div',
  className: customClassName,
  theme,
  ...rest
}) {
  const prefix = usePrefix();
  const className = cx(customClassName, {
    [`${prefix}--white`]: theme === 'white',
    [`${prefix}--g10`]: theme === 'g10',
    [`${prefix}--g90`]: theme === 'g90',
    [`${prefix}--g100`]: theme === 'g100',
    [`${prefix}--layer-one`]: true
  });
  const value = React.useMemo(() => {
    const isDark = theme && ['g90', 'g100'].includes(theme);
    return {
      theme,
      isDark
    };
  }, [theme]);
  const BaseComponentAsAny = BaseComponent;
  return /*#__PURE__*/React.createElement(ThemeContext.Provider, {
    value: value
  }, /*#__PURE__*/React.createElement(LayerContext.Provider, {
    value: 1
  }, /*#__PURE__*/React.createElement(BaseComponentAsAny, _extends({}, rest, {
    className: className
  }))));
}
Theme.propTypes = {
  /**
   * Specify a custom component or element to be rendered as the top-level
   * element in the component
   */
  as: PropTypes.oneOfType([PropTypes.func, PropTypes.string, PropTypes.elementType]),
  /**
   * Provide child elements to be rendered inside of `Theme`
   */
  children: PropTypes.node,
  /**
   * Provide a custom class name to be used on the outermost element rendered by
   * the component
   */
  className: PropTypes.string,
  /**
   * Specify the theme
   */
  theme: PropTypes.oneOf(['white', 'g10', 'g90', 'g100'])
};

/**
 * Get access to the current theme
 */
function useTheme() {
  return React.useContext(ThemeContext);
}
function usePrefersDarkScheme() {
  return useMatchMedia('(prefers-color-scheme: dark)');
}

export { GlobalTheme, Theme, ThemeContext, usePrefersDarkScheme, useTheme };