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

Elastic UI Component Library

function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; }
function _iterableToArrayLimit(arr, i) { var _i = null == arr ? null : "undefined" != typeof Symbol && arr[Symbol.iterator] || arr["@@iterator"]; if (null != _i) { var _s, _e, _x, _r, _arr = [], _n = !0, _d = !1; try { if (_x = (_i = _i.call(arr)).next, 0 === i) { if (Object(_i) !== _i) return; _n = !1; } else for (; !(_n = (_s = _x.call(_i)).done) && (_arr.push(_s.value), _arr.length !== i); _n = !0); } catch (err) { _d = !0, _e = err; } finally { try { if (!_n && null != _i.return && (_r = _i.return(), Object(_r) !== _r)) return; } finally { if (_d) throw _e; } } return _arr; } }
function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
/*
 * 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';
import { throttle } from '../throttle';
import { sortMapByLargeToSmallValues } from './_sorting';
import { jsx as ___EmotionJSX } from "@emotion/react";
export var CurrentEuiBreakpointContext = /*#__PURE__*/createContext(undefined);

/**
 * Top level provider (nested within EuiProvider) which provides a single
 * resize listener that returns the current breakpoint based on window width
 */
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);
};