iep-ui/lib/_util/styleChecker.js

An enterprise-class UI design language and Vue-based implementation

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.detectFlexGapSupported = exports.isFlexSupported = exports.canUseDocElement = undefined;

var _canUseDom = require('./canUseDom');

var _canUseDom2 = _interopRequireDefault(_canUseDom);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

var canUseDocElement = exports.canUseDocElement = function canUseDocElement() {
  return (0, _canUseDom2['default'])() && window.document.documentElement;
};

var isStyleSupport = function isStyleSupport(styleName) {
  if (typeof window !== 'undefined' && window.document && window.document.documentElement) {
    var styleNameList = Array.isArray(styleName) ? styleName : [styleName];
    var documentElement = window.document.documentElement;


    return styleNameList.some(function (name) {
      return name in documentElement.style;
    });
  }
  return false;
};

var isFlexSupported = exports.isFlexSupported = isStyleSupport(['flex', 'webkitFlex', 'Flex', 'msFlex']);

var flexGapSupported = void 0;
var detectFlexGapSupported = exports.detectFlexGapSupported = function detectFlexGapSupported() {
  if (!canUseDocElement()) {
    return false;
  }

  if (flexGapSupported !== undefined) {
    return flexGapSupported;
  }

  // create flex container with row-gap set
  var flex = document.createElement('div');
  flex.style.display = 'flex';
  flex.style.flexDirection = 'column';
  flex.style.rowGap = '1px';

  // create two, elements inside it
  flex.appendChild(document.createElement('div'));
  flex.appendChild(document.createElement('div'));

  // append to the DOM (needed to obtain scrollHeight)
  document.body.appendChild(flex);
  flexGapSupported = flex.scrollHeight === 1; // flex container should be 1px high from the row-gap
  document.body.removeChild(flex);

  return flexGapSupported;
};

exports['default'] = isStyleSupport;