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BaseFeature from '../../foundation/base/base';\r\nimport { debounce } from '../../foundation/utilities/debounce';\r\n\r\nexport default class LazyLoad extends BaseFeature {\r\n\tconstructor(element) {\r\n\t\tsuper(element);\r\n\r\n\t\tthis.elm = element;\r\n\t\tthis.lazyload();\r\n\r\n\t\tthis.debouncedHandleResize = debounce(() => {\r\n\t\t\tthis.handleResize();\r\n\t\t}, 250);\r\n\r\n\t\twindow.addEventListener('resize', this.debouncedHandleResize);\r\n\t}\r\n\r\n\tlazyload() {\r\n\t\t// If useragent doens't support scroll, then it is probably a Google Bot\r\n\t\t// Therefore all images should be rendered for SEO purposes\r\n\t\tconst supportScroll = ('onscroll' in window) && !(/glebot/.test(navigator.userAgent));\r\n\r\n\t\t// If the useragent doesn't support IntersectionObserver, we need to render all images\r\n\t\tconst supportIntersectionObserver = 'IntersectionObserver' in window;\r\n\r\n\t\tif (supportScroll && supportIntersectionObserver) {\r\n\t\t\tthis.observe();\r\n\t\t} else {\r\n\t\t\tthis.reveal();\r\n\t\t}\r\n\t}\r\n\r\n\tobserve() {\r\n\t\tconst observerOptions = {\r\n\t\t\t// Offset the IntersectionObserver by 20%\r\n\t\t\trootMargin: '20%'\r\n\t\t};\r\n\r\n\t\tthis.observer = new IntersectionObserver(this.handleIntersect.bind(this), observerOptions);\r\n\t\tthis.observer.observe(this.elm);\r\n\t}\r\n\r\n\thandleIntersect(entries, observer) {\r\n\t\tentries.forEach((entry) => {\r\n\t\t\tif (entry.isIntersecting) {\r\n\t\t\t\tthis.reveal();\r\n\t\t\t\tobserver.disconnect();\r\n\t\t\t}\r\n\t\t});\r\n\t}\r\n\r\n\thandleResize() {\r\n\t\tthis.calculateSize();\r\n\t}\r\n\r\n\tcalculateSize() {\r\n\t\tconst width = Math.round(this.dom.img.offsetWidth / document.documentElement.clientWidth * 100);\r\n\t\tthis.dom.img.setAttribute('sizes', `(max-width: 768px) 100vw, ${width}vw`);\r\n\t\tthis.dom.src.setAttribute('sizes', `(max-width: 768px) 100vw, ${width}vw`);\r\n\t}\r\n\r\n\treveal() {\r\n\t\tthis.calculateSize();\r\n\r\n\t\tthis.dom.img.onload = () => {\r\n\t\t\tthis.element.classList.add('is-loaded');\r\n\t\t};\r\n\r\n\t\tthis.dom.src.setAttribute('srcset', this.dom.src.getAttribute('data-srcset'));\r\n\t\tthis.dom.img.setAttribute('srcset', this.dom.img.getAttribute('data-srcset'));\r\n\t\tthis.dom.img.setAttribute('src', this.dom.img.getAttribute('data-src'));\r\n\t}\r\n}\r\n","var $ = require('../internals/export');\nvar fails = require('../internals/fails');\nvar toObject = require('../internals/to-object');\nvar nativeGetPrototypeOf = require('../internals/object-get-prototype-of');\nvar CORRECT_PROTOTYPE_GETTER = require('../internals/correct-prototype-getter');\n\nvar FAILS_ON_PRIMITIVES = fails(function () { nativeGetPrototypeOf(1); });\n\n// `Object.getPrototypeOf` method\n// https://tc39.es/ecma262/#sec-object.getprototypeof\n$({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES, sham: !CORRECT_PROTOTYPE_GETTER }, {\n  getPrototypeOf: function getPrototypeOf(it) {\n    return nativeGetPrototypeOf(toObject(it));\n  }\n});\n\n","var $ = require('../internals/export');\nvar getBuiltIn = require('../internals/get-built-in');\nvar aConstructor = require('../internals/a-constructor');\nvar anObject = require('../internals/an-object');\nvar isObject = require('../internals/is-object');\nvar create = require('../internals/object-create');\nvar bind = require('../internals/function-bind');\nvar fails = require('../internals/fails');\n\nvar nativeConstruct = getBuiltIn('Reflect', 'construct');\n\n// `Reflect.construct` method\n// https://tc39.es/ecma262/#sec-reflect.construct\n// MS Edge supports only 2 arguments and argumentsList argument is optional\n// FF Nightly sets third argument as `new.target`, but does not create `this` from it\nvar NEW_TARGET_BUG = fails(function () {\n  function F() { /* empty */ }\n  return !(nativeConstruct(function () { /* empty */ }, [], F) instanceof F);\n});\nvar ARGS_BUG = !fails(function () {\n  nativeConstruct(function () { /* empty */ });\n});\nvar FORCED = NEW_TARGET_BUG || ARGS_BUG;\n\n$({ target: 'Reflect', stat: true, forced: FORCED, sham: FORCED }, {\n  construct: function construct(Target, args /* , newTarget */) {\n    aConstructor(Target);\n    anObject(args);\n    var newTarget = arguments.length < 3 ? Target : aConstructor(arguments[2]);\n    if (ARGS_BUG && !NEW_TARGET_BUG) return nativeConstruct(Target, args, newTarget);\n    if (Target == newTarget) {\n      // w/o altered newTarget, optimization for 0-4 arguments\n      switch (args.length) {\n        case 0: return new Target();\n        case 1: return new Target(args[0]);\n        case 2: return new Target(args[0], args[1]);\n        case 3: return new Target(args[0], args[1], args[2]);\n        case 4: return new Target(args[0], args[1], args[2], args[3]);\n      }\n      // w/o altered newTarget, lot of arguments case\n      var $args = [null];\n      $args.push.apply($args, args);\n      return new (bind.apply(Target, $args))();\n    }\n    // with altered newTarget, not support built-in constructors\n    var proto = newTarget.prototype;\n    var instance = create(isObject(proto) ? proto : Object.prototype);\n    var result = Function.apply.call(Target, instance, args);\n    return isObject(result) ? result : instance;\n  }\n});\n","'use strict';\nvar aCallable = require('../internals/a-callable');\nvar isObject = require('../internals/is-object');\n\nvar slice = [].slice;\nvar factories = {};\n\nvar construct = function (C, argsLength, args) {\n  if (!(argsLength in factories)) {\n    for (var list = [], i = 0; i < argsLength; i++) list[i] = 'a[' + i + ']';\n    // eslint-disable-next-line no-new-func -- we have no proper alternatives, IE8- only\n    factories[argsLength] = Function('C,a', 'return new C(' + list.join(',') + ')');\n  } return factories[argsLength](C, args);\n};\n\n// `Function.prototype.bind` method implementation\n// https://tc39.es/ecma262/#sec-function.prototype.bind\nmodule.exports = Function.bind || function bind(that /* , ...args */) {\n  var fn = aCallable(this);\n  var partArgs = slice.call(arguments, 1);\n  var boundFunction = function bound(/* args... */) {\n    var args = partArgs.concat(slice.call(arguments));\n    return this instanceof boundFunction ? construct(fn, args.length, args) : fn.apply(that, args);\n  };\n  if (isObject(fn.prototype)) boundFunction.prototype = fn.prototype;\n  return boundFunction;\n};\n"],"sourceRoot":""}