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Util from './util'\n\n\n/**\n * --------------------------------------------------------------------------\n * Bootstrap (v4.0.0-beta): scrollspy.js\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)\n * --------------------------------------------------------------------------\n */\n\nconst ScrollSpy = (($) => {\n\n\n /**\n * ------------------------------------------------------------------------\n * Constants\n * ------------------------------------------------------------------------\n */\n\n const NAME = 'scrollspy'\n const VERSION = '4.0.0-beta'\n const DATA_KEY = 'bs.scrollspy'\n const EVENT_KEY = `.${DATA_KEY}`\n const DATA_API_KEY = '.data-api'\n const JQUERY_NO_CONFLICT = $.fn[NAME]\n\n const Default = {\n offset : 10,\n method : 'auto',\n target : ''\n }\n\n const DefaultType = {\n offset : 'number',\n method : 'string',\n target : '(string|element)'\n }\n\n const Event = {\n ACTIVATE : `activate${EVENT_KEY}`,\n SCROLL : `scroll${EVENT_KEY}`,\n LOAD_DATA_API : `load${EVENT_KEY}${DATA_API_KEY}`\n }\n\n const ClassName = {\n DROPDOWN_ITEM : 'dropdown-item',\n DROPDOWN_MENU : 'dropdown-menu',\n ACTIVE : 'active'\n }\n\n const Selector = {\n DATA_SPY : '[data-spy=\"scroll\"]',\n ACTIVE : '.active',\n NAV_LIST_GROUP : '.nav, .list-group',\n NAV_LINKS : '.nav-link',\n LIST_ITEMS : '.list-group-item',\n DROPDOWN : '.dropdown',\n DROPDOWN_ITEMS : '.dropdown-item',\n DROPDOWN_TOGGLE : '.dropdown-toggle'\n }\n\n const OffsetMethod = {\n OFFSET : 'offset',\n POSITION : 'position'\n }\n\n\n /**\n * ------------------------------------------------------------------------\n * Class Definition\n * ------------------------------------------------------------------------\n */\n\n class ScrollSpy {\n\n constructor(element, config) {\n this._element = element\n this._scrollElement = element.tagName === 'BODY' ? window : element\n this._config = this._getConfig(config)\n this._selector = `${this._config.target} ${Selector.NAV_LINKS},`\n + `${this._config.target} ${Selector.LIST_ITEMS},`\n + `${this._config.target} ${Selector.DROPDOWN_ITEMS}`\n this._offsets = []\n this._targets = []\n this._activeTarget = null\n this._scrollHeight = 0\n\n $(this._scrollElement).on(Event.SCROLL, (event) => this._process(event))\n\n this.refresh()\n this._process()\n }\n\n\n // getters\n\n static get VERSION() {\n return VERSION\n }\n\n static get Default() {\n return Default\n }\n\n\n // public\n\n refresh() {\n const autoMethod = this._scrollElement !== this._scrollElement.window ?\n OffsetMethod.POSITION : OffsetMethod.OFFSET\n\n const offsetMethod = this._config.method === 'auto' ?\n autoMethod : this._config.method\n\n const offsetBase = offsetMethod === OffsetMethod.POSITION ?\n this._getScrollTop() : 0\n\n this._offsets = []\n this._targets = []\n\n this._scrollHeight = this._getScrollHeight()\n\n const targets = $.makeArray($(this._selector))\n\n targets\n .map((element) => {\n let target\n const targetSelector = Util.getSelectorFromElement(element)\n\n if (targetSelector) {\n target = $(targetSelector)[0]\n }\n\n if (target) {\n const targetBCR = target.getBoundingClientRect()\n if (targetBCR.width || targetBCR.height) {\n // todo (fat): remove sketch reliance on jQuery position/offset\n return [\n $(target)[offsetMethod]().top + offsetBase,\n targetSelector\n ]\n }\n }\n return null\n })\n .filter((item) => item)\n .sort((a, b) => a[0] - b[0])\n .forEach((item) => {\n this._offsets.push(item[0])\n this._targets.push(item[1])\n })\n }\n\n dispose() {\n $.removeData(this._element, DATA_KEY)\n $(this._scrollElement).off(EVENT_KEY)\n\n this._element = null\n this._scrollElement = null\n this._config = null\n this._selector = null\n this._offsets = null\n this._targets = null\n this._activeTarget = null\n this._scrollHeight = null\n }\n\n\n // private\n\n _getConfig(config) {\n config = $.extend({}, Default, config)\n\n if (typeof config.target !== 'string') {\n let id = $(config.target).attr('id')\n if (!id) {\n id = Util.getUID(NAME)\n $(config.target).attr('id', id)\n }\n config.target = `#${id}`\n }\n\n Util.typeCheckConfig(NAME, config, DefaultType)\n\n return config\n }\n\n _getScrollTop() {\n return this._scrollElement === window ?\n this._scrollElement.pageYOffset : this._scrollElement.scrollTop\n }\n\n _getScrollHeight() {\n return this._scrollElement.scrollHeight || Math.max(\n document.body.scrollHeight,\n document.documentElement.scrollHeight\n )\n }\n\n _getOffsetHeight() {\n return this._scrollElement === window ?\n window.innerHeight : this._scrollElement.getBoundingClientRect().height\n }\n\n _process() {\n const scrollTop = this._getScrollTop() + this._config.offset\n const scrollHeight = this._getScrollHeight()\n const maxScroll = this._config.offset\n + scrollHeight\n - this._getOffsetHeight()\n\n if (this._scrollHeight !== scrollHeight) {\n this.refresh()\n }\n\n if (scrollTop >= maxScroll) {\n const target = this._targets[this._targets.length - 1]\n\n if (this._activeTarget !== target) {\n this._activate(target)\n }\n return\n }\n\n if (this._activeTarget && scrollTop < this._offsets[0] && this._offsets[0] > 0) {\n this._activeTarget = null\n this._clear()\n return\n }\n\n for (let i = this._offsets.length; i--;) {\n const isActiveTarget = this._activeTarget !== this._targets[i]\n && scrollTop >= this._offsets[i]\n && (this._offsets[i + 1] === undefined ||\n scrollTop < this._offsets[i + 1])\n\n if (isActiveTarget) {\n this._activate(this._targets[i])\n }\n }\n }\n\n _activate(target) {\n this._activeTarget = target\n\n this._clear()\n\n let queries = this._selector.split(',')\n queries = queries.map((selector) => {\n return `${selector}[data-target=\"${target}\"],` +\n `${selector}[href=\"${target}\"]`\n })\n\n const $link = $(queries.join(','))\n\n if ($link.hasClass(ClassName.DROPDOWN_ITEM)) {\n $link.closest(Selector.DROPDOWN).find(Selector.DROPDOWN_TOGGLE).addClass(ClassName.ACTIVE)\n $link.addClass(ClassName.ACTIVE)\n } else {\n // Set triggered link as active\n $link.addClass(ClassName.ACTIVE)\n // Set triggered links parents as active\n // With both <ul> and <nav> markup a parent is the previous sibling of any nav ancestor\n $link.parents(Selector.NAV_LIST_GROUP).prev(`${Selector.NAV_LINKS}, ${Selector.LIST_ITEMS}`).addClass(ClassName.ACTIVE)\n }\n\n $(this._scrollElement).trigger(Event.ACTIVATE, {\n relatedTarget: target\n })\n }\n\n _clear() {\n $(this._selector).filter(Selector.ACTIVE).removeClass(ClassName.ACTIVE)\n }\n\n\n // static\n\n static _jQueryInterface(config) {\n return this.each(function () {\n let data = $(this).data(DATA_KEY)\n const _config = typeof config === 'object' && config\n\n if (!data) {\n data = new ScrollSpy(this, _config)\n $(this).data(DATA_KEY, data)\n }\n\n if (typeof config === 'string') {\n if (data[config] === undefined) {\n throw new Error(`No method named \"${config}\"`)\n }\n data[config]()\n }\n })\n }\n\n\n }\n\n\n /**\n * ------------------------------------------------------------------------\n * Data Api implementation\n * ------------------------------------------------------------------------\n */\n\n $(window).on(Event.LOAD_DATA_API, () => {\n const scrollSpys = $.makeArray($(Selector.DATA_SPY))\n\n for (let i = scrollSpys.length; i--;) {\n const $spy = $(scrollSpys[i])\n ScrollSpy._jQueryInterface.call($spy, $spy.data())\n }\n })\n\n\n /**\n * ------------------------------------------------------------------------\n * jQuery\n * ------------------------------------------------------------------------\n */\n\n $.fn[NAME] = ScrollSpy._jQueryInterface\n $.fn[NAME].Constructor = ScrollSpy\n $.fn[NAME].noConflict = function () {\n $.fn[NAME] = JQUERY_NO_CONFLICT\n return ScrollSpy._jQueryInterface\n }\n\n return ScrollSpy\n\n})(jQuery)\n\nexport default ScrollSpy\n"]}
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