@elastic/eui/optimize/es/services/breakpoint/current_breakpoint.js

Elastic UI Component Library

import _slicedToArray from "@babel/runtime/helpers/slicedToArray";
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

import React, { createContext, useState, useEffect, useMemo, useCallback } from 'react';
import { keysOf } from '../../components/common';
import { useEuiTheme } from '../theme/hooks';
import { throttle } from '../throttle';
import { sortMapByLargeToSmallValues } from './_sorting';
import { jsx as ___EmotionJSX } from "@emotion/react";
export var CurrentEuiBreakpointContext = /*#__PURE__*/createContext(undefined);

/**
 * Returns the current breakpoint based on window width.
 * Typically only called by the top-level `EuiProvider` (to reduce the number
 * of window resize listeners on the page). Also conditionally called if a
 * nested `EuiThemeProvider` defines a `modify.breakpoint` override
 */
export var CurrentEuiBreakpointProvider = function CurrentEuiBreakpointProvider(_ref) {
  var children = _ref.children;
  // Obtain the breakpoints map from the EUI theme
  var _useEuiTheme = useEuiTheme(),
    breakpoints = _useEuiTheme.euiTheme.breakpoint;

  // Ensure the breakpoints map is sorted from largest value to smallest
  var sortedBreakpoints = useMemo(function () {
    return sortMapByLargeToSmallValues(breakpoints);
  }, [breakpoints]);

  // Find the breakpoint (key) whose value is <= windowWidth starting with largest first
  var getBreakpoint = useCallback(function (width) {
    return keysOf(sortedBreakpoints).find(function (key) {
      return sortedBreakpoints[key] <= width;
    });
  }, [sortedBreakpoints]);
  var _useState = useState(typeof window !== 'undefined' ? getBreakpoint(window.innerWidth) : undefined),
    _useState2 = _slicedToArray(_useState, 2),
    currentBreakpoint = _useState2[0],
    setCurrentBreakpoint = _useState2[1];
  useEffect(function () {
    var onWindowResize = throttle(function () {
      setCurrentBreakpoint(getBreakpoint(window.innerWidth));
    }, 50);
    window.addEventListener('resize', onWindowResize);
    return function () {
      return window.removeEventListener('resize', onWindowResize);
    };
  }, [getBreakpoint]);
  return ___EmotionJSX(CurrentEuiBreakpointContext.Provider, {
    value: currentBreakpoint
  }, children);
};