@material-ui/core/es/styles/MuiThemeProvider.js

React components that implement Google's Material Design.

import _objectSpread from "@babel/runtime/helpers/objectSpread";
import React from 'react';
import PropTypes from 'prop-types';
import warning from 'warning';
import createBroadcast from 'brcast';
import themeListener, { CHANNEL } from './themeListener';
import exactProp from '../utils/exactProp';
/**
 * This component takes a `theme` property.
 * It makes the `theme` available down the React tree thanks to React context.
 * This component should preferably be used at **the root of your component tree**.
 */

class MuiThemeProvider extends React.Component {
  // We are not using the React state in order to avoid unnecessary rerender.
  constructor(props, context) {
    super(); // Get the outer theme from the context, can be null

    this.broadcast = createBroadcast();
    this.outerTheme = themeListener.initial(context); // Propagate the theme so it can be accessed by the children

    this.broadcast.setState(this.mergeOuterLocalTheme(props.theme));
  }

  getChildContext() {
    const {
      sheetsManager,
      disableStylesGeneration
    } = this.props;
    const muiThemeProviderOptions = this.context.muiThemeProviderOptions || {};

    if (sheetsManager !== undefined) {
      muiThemeProviderOptions.sheetsManager = sheetsManager;
    }

    if (disableStylesGeneration !== undefined) {
      muiThemeProviderOptions.disableStylesGeneration = disableStylesGeneration;
    }

    return {
      [CHANNEL]: this.broadcast,
      muiThemeProviderOptions
    };
  }

  componentDidMount() {
    // Subscribe on the outer theme, if present
    this.unsubscribeId = themeListener.subscribe(this.context, outerTheme => {
      this.outerTheme = outerTheme; // Forward the parent theme update to the children

      this.broadcast.setState(this.mergeOuterLocalTheme(this.props.theme));
    });
  }

  componentDidUpdate(prevProps) {
    // Propagate a local theme update
    if (this.props.theme !== prevProps.theme) {
      this.broadcast.setState(this.mergeOuterLocalTheme(this.props.theme));
    }
  }

  componentWillUnmount() {
    if (this.unsubscribeId !== null) {
      themeListener.unsubscribe(this.context, this.unsubscribeId);
    }
  } // Simple merge between the outer theme and the local theme


  mergeOuterLocalTheme(localTheme) {
    // To support composition of theme.
    if (typeof localTheme === 'function') {
      process.env.NODE_ENV !== "production" ? warning(this.outerTheme, ['Material-UI: you are providing a theme function property ' + 'to the MuiThemeProvider component:', '<MuiThemeProvider theme={outerTheme => outerTheme} />', 'However, no outer theme is present.', 'Make sure a theme is already injected higher in the React tree ' + 'or provide a theme object.'].join('\n')) : void 0;
      return localTheme(this.outerTheme);
    }

    if (!this.outerTheme) {
      return localTheme;
    }

    return _objectSpread({}, this.outerTheme, localTheme);
  }

  render() {
    // TODO move the sheetsManager property to a different component.
    // warning(
    //   typeof window !== 'undefined' || this.props.sheetsManager,
    //   [
    //     'Material-UI: you need to provide a sheetsManager to the MuiThemeProvider ' +
    //       'when rendering on the server.',
    //     'If you do not, you might experience a memory leak',
    //   ].join('\n'),
    // );
    return this.props.children;
  }

}

MuiThemeProvider.propTypes = process.env.NODE_ENV !== "production" ? {
  /**
   * You can wrap a node.
   */
  children: PropTypes.node.isRequired,

  /**
   * You can disable the generation of the styles with this option.
   * It can be useful when traversing the React tree outside of the HTML
   * rendering step on the server.
   * Let's say you are using react-apollo to extract all
   * the queries made by the interface server side.
   * You can significantly speed up the traversal with this property.
   */
  disableStylesGeneration: PropTypes.bool,

  /**
   * The sheetsManager is used to deduplicate style sheet injection in the page.
   * It's deduplicating using the (theme, styles) couple.
   * On the server, you should provide a new instance for each request.
   */
  sheetsManager: PropTypes.object,

  /**
   * A theme object.
   */
  theme: PropTypes.oneOfType([PropTypes.object, PropTypes.func]).isRequired
} : {};
MuiThemeProvider.propTypes = process.env.NODE_ENV !== "production" ? exactProp(MuiThemeProvider.propTypes) : {};
MuiThemeProvider.childContextTypes = _objectSpread({}, themeListener.contextTypes, {
  muiThemeProviderOptions: PropTypes.object
});
MuiThemeProvider.contextTypes = _objectSpread({}, themeListener.contextTypes, {
  muiThemeProviderOptions: PropTypes.object
});
export default MuiThemeProvider;