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1);\n","/*!\r\n globals: angular, window\r\n List of used element methods available in JQuery but not in JQuery Lite\r\n element.before(elem)\r\n element.height()\r\n element.outerHeight(true)\r\n element.height(value) = only for Top/Bottom padding elements\r\n element.scrollTop()\r\n element.scrollTop(value)\r\n */\r\n\r\nexport default class JQLiteExtras {\r\n\r\n  registerFor(element) {\r\n    let convertToPx, css, getStyle, isWindow;\r\n    // angular implementation blows up if elem is the window\r\n    css = angular.element.prototype.css;\r\n\r\n    element.prototype.css = function (name, value) {\r\n      let self = this;\r\n      let elem = self[0];\r\n      if (!(!elem || elem.nodeType === 3 || elem.nodeType === 8 || !elem.style)) {\r\n        return css.call(self, name, value);\r\n      }\r\n    };\r\n\r\n    // as defined in angularjs v1.0.5\r\n    isWindow = (obj) => obj && obj.document && obj.location && obj.alert && obj.setInterval;\r\n\r\n    function scrollTo(self, direction, value) {\r\n      let elem = self[0];\r\n      let [method, prop, preserve] = {\r\n        top: [\r\n          'scrollTop',\r\n          'pageYOffset',\r\n          'scrollLeft'\r\n        ],\r\n        left: [\r\n          'scrollLeft',\r\n          'pageXOffset',\r\n          'scrollTop'\r\n        ]\r\n      }[direction];\r\n\r\n      const isValueDefined = typeof value !== 'undefined';\r\n      if (isWindow(elem)) {\r\n        if (isValueDefined) {\r\n          return elem.scrollTo(self[preserve].call(self), value);\r\n        }\r\n        return (prop in elem) ? elem[prop] : elem.document.documentElement[method];\r\n      } else {\r\n        if (isValueDefined) {\r\n          elem[method] = value;\r\n        }\r\n        return elem[method];\r\n      }\r\n    }\r\n\r\n    if (window.getComputedStyle) {\r\n      getStyle = (elem) => window.getComputedStyle(elem, null);\r\n      convertToPx = (elem, value) => parseFloat(value);\r\n    } else {\r\n      getStyle = (elem) => elem.currentStyle;\r\n      convertToPx = (elem, value) => {\r\n        let left, result, rs, rsLeft, style;\r\n        let core_pnum = /[+-]?(?:\\d*\\.|)\\d+(?:[eE][+-]?\\d+|)/.source;\r\n        let rnumnonpx = new RegExp('^(' + core_pnum + ')(?!px)[a-z%]+$', 'i');\r\n\r\n        if (!rnumnonpx.test(value)) {\r\n          return parseFloat(value);\r\n        }\r\n\r\n        // ported from JQuery\r\n        style = elem.style;\r\n        left = style.left;\r\n        rs = elem.runtimeStyle;\r\n        rsLeft = rs && rs.left;\r\n        if (rs) {\r\n          rs.left = style.left;\r\n        }\r\n        // put in the new values to get a computed style out\r\n        style.left = value;\r\n        result = style.pixelLeft;\r\n        style.left = left;\r\n        if (rsLeft) {\r\n          rs.left = rsLeft;\r\n        }\r\n        return result;\r\n      };\r\n    }\r\n\r\n    function getMeasurements(elem, measure) {\r\n      let base, borderA, borderB, computedMarginA, computedMarginB, computedStyle, dirA, dirB, marginA, marginB, paddingA, paddingB;\r\n\r\n      if (isWindow(elem)) {\r\n        base = document.documentElement[{height: 'clientHeight', width: 'clientWidth'}[measure]];\r\n\r\n        return {\r\n          base: base,\r\n          padding: 0,\r\n          border: 0,\r\n          margin: 0\r\n        };\r\n      }\r\n\r\n      // Start with offset property\r\n      [\r\n        base,\r\n        dirA,\r\n        dirB\r\n      ] = {\r\n        width: [\r\n          elem.offsetWidth,\r\n          'Left',\r\n          'Right'\r\n        ],\r\n        height: [\r\n          elem.offsetHeight,\r\n          'Top',\r\n          'Bottom'\r\n        ]\r\n      }[measure];\r\n\r\n      computedStyle = getStyle(elem);\r\n      paddingA = convertToPx(elem, computedStyle['padding' + dirA]) || 0;\r\n      paddingB = convertToPx(elem, computedStyle['padding' + dirB]) || 0;\r\n      borderA = convertToPx(elem, computedStyle['border' + dirA + 'Width']) || 0;\r\n      borderB = convertToPx(elem, computedStyle['border' + dirB + 'Width']) || 0;\r\n      computedMarginA = computedStyle['margin' + dirA];\r\n      computedMarginB = computedStyle['margin' + dirB];\r\n\r\n      // I do not care for width for now, so this hack is irrelevant\r\n      // if ( !supportsPercentMargin )\r\n      // computedMarginA = hackPercentMargin( elem, computedStyle, computedMarginA )\r\n      // computedMarginB = hackPercentMargin( elem, computedStyle, computedMarginB )\r\n      marginA = convertToPx(elem, computedMarginA) || 0;\r\n      marginB = convertToPx(elem, computedMarginB) || 0;\r\n\r\n      return {\r\n        base: base,\r\n        padding: paddingA + paddingB,\r\n        border: borderA + borderB,\r\n        margin: marginA + marginB\r\n      };\r\n    }\r\n\r\n    function getWidthHeight(elem, direction, measure) {\r\n      let computedStyle, result;\r\n\r\n      let measurements = getMeasurements(elem, direction);\r\n\r\n      if (measurements.base > 0) {\r\n        return {\r\n          base: measurements.base - measurements.padding - measurements.border,\r\n          outer: measurements.base,\r\n          outerfull: measurements.base + measurements.margin\r\n        }[measure];\r\n      }\r\n\r\n      // Fall back to computed then uncomputed css if necessary\r\n      computedStyle = getStyle(elem);\r\n      result = computedStyle[direction];\r\n\r\n      if (result < 0 || result === null) {\r\n        result = elem.style[direction] || 0;\r\n      }\r\n\r\n      // Normalize \"\", auto, and prepare for extra\r\n      result = parseFloat(result) || 0;\r\n\r\n      return {\r\n        base: result - measurements.padding - measurements.border,\r\n        outer: result,\r\n        outerfull: result + measurements.padding + measurements.border + measurements.margin\r\n      }[measure];\r\n    }\r\n\r\n    // define missing methods\r\n    return angular.forEach({\r\n      before(newElem) {\r\n        var children, elem, i, j, parent, ref, self;\r\n        self = this;\r\n        elem = self[0];\r\n        parent = self.parent();\r\n        children = parent.contents();\r\n        if (children[0] === elem) {\r\n          return parent.prepend(newElem);\r\n        } else {\r\n          for (i = j = 1, ref = children.length - 1; 1 <= ref ? j <= ref : j >= ref; i = 1 <= ref ? ++j : --j) {\r\n            if (children[i] === elem) {\r\n              angular.element(children[i - 1]).after(newElem);\r\n              return;\r\n            }\r\n          }\r\n          throw new Error('invalid DOM structure ' + elem.outerHTML);\r\n        }\r\n      },\r\n      height (value){\r\n        var self;\r\n        self = this;\r\n        if (typeof value !== 'undefined') {\r\n          if (angular.isNumber(value)) {\r\n            value = value + 'px';\r\n          }\r\n          return css.call(self, 'height', value);\r\n        } else {\r\n          return getWidthHeight(this[0], 'height', 'base');\r\n        }\r\n      },\r\n      outerHeight(option) {\r\n        return getWidthHeight(this[0], 'height', option ? 'outerfull' : 'outer');\r\n      },\r\n      outerWidth(option) {\r\n        return getWidthHeight(this[0], 'width', option ? 'outerfull' : 'outer');\r\n      },\r\n\r\n      /*\r\n       The offset setter method is not implemented\r\n       */\r\n      offset(value) {\r\n        let docElem, win;\r\n        let self = this;\r\n        let box = {\r\n          top: 0,\r\n          left: 0\r\n        };\r\n        let elem = self[0];\r\n        let doc = elem && elem.ownerDocument;\r\n\r\n        if (arguments.length) {\r\n          if (value === undefined) {\r\n            return self;\r\n          }\r\n          // TODO: implement setter\r\n          throw new Error('offset setter method is not implemented');\r\n        }\r\n\r\n        if (!doc) {\r\n          return;\r\n        }\r\n\r\n        docElem = doc.documentElement;\r\n\r\n        // TODO: Make sure it's not a disconnected DOM node\r\n\r\n        if (elem.getBoundingClientRect != null) {\r\n          box = elem.getBoundingClientRect();\r\n        }\r\n\r\n        win = doc.defaultView || doc.parentWindow;\r\n\r\n        return {\r\n          top: box.top + (win.pageYOffset || docElem.scrollTop) - (docElem.clientTop || 0),\r\n          left: box.left + (win.pageXOffset || docElem.scrollLeft) - (docElem.clientLeft || 0)\r\n        };\r\n      },\r\n      scrollTop(value) {\r\n        return scrollTo(this, 'top', value);\r\n      },\r\n      scrollLeft(value) {\r\n        return scrollTo(this, 'left', value);\r\n      }\r\n    }, (value, key) => {\r\n      if (!element.prototype[key]) {\r\n        return element.prototype[key] = value;\r\n      }\r\n    });\r\n  }\r\n\r\n}\r\n","const hideClassToken = 'ng-ui-scroll-hide';\r\n\r\nexport default class ElementRoutines {\r\n\r\n  static addCSSRules() {\r\n    const selector = '.' + hideClassToken;\r\n    const rules = 'display: none';\r\n    const sheet = document.styleSheets[0];\r\n    let index;\r\n    try {\r\n      index = sheet.cssRules.length;\r\n    } catch (err) {\r\n      index = 0;\r\n    }\r\n    if('insertRule' in sheet) {\r\n      sheet.insertRule(selector + '{' + rules + '}', index);\r\n    }\r\n    else if('addRule' in sheet) {\r\n      sheet.addRule(selector, rules, index);\r\n    }\r\n  }\r\n\r\n  constructor($injector, $q) {\r\n    this.$animate = ($injector.has && $injector.has('$animate')) ? $injector.get('$animate') : null;\r\n    this.isAngularVersionLessThen1_3 = angular.version.major === 1 && angular.version.minor < 3;\r\n    this.$q = $q;\r\n  }\r\n\r\n  hideElement(wrapper) {\r\n    wrapper.element.addClass(hideClassToken);\r\n  }\r\n\r\n  showElement(wrapper) {\r\n    wrapper.element.removeClass(hideClassToken);\r\n  }\r\n\r\n  insertElement(newElement, previousElement) {\r\n    previousElement.after(newElement);\r\n    return [];\r\n  }\r\n\r\n  removeElement(wrapper) {\r\n    wrapper.element.remove();\r\n    wrapper.scope.$destroy();\r\n    return [];\r\n  }\r\n\r\n  insertElementAnimated(newElement, previousElement) {\r\n    if (!this.$animate) {\r\n      return this.insertElement(newElement, previousElement);\r\n    }\r\n\r\n    if (this.isAngularVersionLessThen1_3) {\r\n      const deferred = this.$q.defer();\r\n      // no need for parent - previous element is never null\r\n      this.$animate.enter(newElement, null, previousElement, () => deferred.resolve());\r\n\r\n      return [deferred.promise];\r\n    }\r\n\r\n    // no need for parent - previous element is never null\r\n    return [this.$animate.enter(newElement, null, previousElement)];\r\n  }\r\n\r\n  removeElementAnimated(wrapper) {\r\n    if (!this.$animate) {\r\n      return this.removeElement(wrapper);\r\n    }\r\n\r\n    if (this.isAngularVersionLessThen1_3) {\r\n      const deferred = this.$q.defer();\r\n      this.$animate.leave(wrapper.element, () => {\r\n        wrapper.scope.$destroy();\r\n        return deferred.resolve();\r\n      });\r\n\r\n      return [deferred.promise];\r\n    }\r\n\r\n    return [(this.$animate.leave(wrapper.element)).then(() => wrapper.scope.$destroy())];\r\n  }\r\n}","export default function ScrollBuffer(elementRoutines, bufferSize, startIndex) {\r\n  const buffer = Object.create(Array.prototype);\r\n\r\n  angular.extend(buffer, {\r\n    size: bufferSize,\r\n\r\n    reset(startIndex) {\r\n      buffer.remove(0, buffer.length);\r\n      buffer.eof = false;\r\n      buffer.bof = false;\r\n      buffer.first = startIndex;\r\n      buffer.next = startIndex;\r\n      buffer.minIndex = startIndex;\r\n      buffer.maxIndex = startIndex;\r\n      buffer.minIndexUser = null;\r\n      buffer.maxIndexUser = null;\r\n    },\r\n\r\n    append(items) {\r\n      items.forEach((item) => {\r\n        ++buffer.next;\r\n        buffer.insert('append', item);\r\n      });\r\n      buffer.maxIndex = buffer.eof ? buffer.next - 1 : Math.max(buffer.next - 1, buffer.maxIndex);\r\n    },\r\n\r\n    prepend(items, immutableTop) {\r\n      items.reverse().forEach((item) => {\r\n        if (immutableTop) {\r\n          ++buffer.next;\r\n        }\r\n        else {\r\n          --buffer.first;\r\n        }\r\n        buffer.insert('prepend', item);\r\n      });\r\n      buffer.minIndex = buffer.bof ? buffer.minIndex = buffer.first : Math.min(buffer.first, buffer.minIndex);\r\n    },\r\n\r\n    /**\r\n     * inserts wrapped element in the buffer\r\n     * the first argument is either operation keyword (see below) or a number for operation 'insert'\r\n     * for insert the number is the index for the buffer element the new one have to be inserted after\r\n     * operations: 'append', 'prepend', 'insert', 'remove', 'update', 'none'\r\n     */\r\n    insert(operation, item, isTop) {\r\n      const wrapper = {\r\n        item: item\r\n      };\r\n\r\n      if (operation % 1 === 0) {// it is an insert\r\n        wrapper.op = 'insert';\r\n        buffer.splice(operation, 0, wrapper);\r\n        if(isTop) {\r\n          buffer.first--;\r\n        }\r\n        else {\r\n          buffer.next++;\r\n        }\r\n      } else {\r\n        wrapper.op = operation;\r\n        switch (operation) {\r\n          case 'append':\r\n            buffer.push(wrapper);\r\n            break;\r\n          case 'prepend':\r\n            buffer.unshift(wrapper);\r\n            break;\r\n        }\r\n      }\r\n    },\r\n\r\n    // removes elements from buffer\r\n    remove(arg1, arg2) {\r\n      if (angular.isNumber(arg1)) {\r\n        // removes items from arg1 (including) through arg2 (excluding)\r\n        for (let i = arg1; i < arg2; i++) {\r\n          elementRoutines.removeElement(buffer[i]);\r\n        }\r\n        return buffer.splice(arg1, arg2 - arg1);\r\n      }\r\n      // removes single item(wrapper) from the buffer\r\n      buffer.splice(buffer.indexOf(arg1), 1);\r\n      if(arg1._op === 'isTop' && buffer.first === this.getAbsMinIndex()) {\r\n        this.incrementMinIndex();\r\n      }\r\n      else {\r\n        this.decrementMaxIndex();\r\n      }\r\n      if(arg1._op === 'isTop') {\r\n        buffer.first++;\r\n      }\r\n      else {\r\n        buffer.next--;\r\n      }\r\n      if(!buffer.length) {\r\n        buffer.first = 1;\r\n        buffer.next = 1;\r\n      }\r\n\r\n      return elementRoutines.removeElementAnimated(arg1);\r\n    },\r\n\r\n    incrementMinIndex() {\r\n      if(buffer.minIndexUser !== null) {\r\n        if(buffer.minIndex > buffer.minIndexUser) {\r\n          buffer.minIndexUser++;\r\n          return;\r\n        }\r\n        if(buffer.minIndex === buffer.minIndexUser) {\r\n          buffer.minIndexUser++;\r\n        }\r\n      }\r\n      buffer.minIndex++;\r\n    },\r\n\r\n    decrementMaxIndex() {\r\n      if(buffer.maxIndexUser !== null && buffer.maxIndex <= buffer.maxIndexUser) {\r\n        buffer.maxIndexUser--;\r\n      }\r\n      buffer.maxIndex--;\r\n    },\r\n\r\n    getAbsMinIndex() {\r\n      if(buffer.minIndexUser !== null) {\r\n        return Math.min(buffer.minIndexUser, buffer.minIndex);\r\n      }\r\n      return buffer.minIndex;\r\n    },\r\n\r\n    getAbsMaxIndex() {\r\n      if(buffer.maxIndexUser !== null) {\r\n        return Math.max(buffer.maxIndexUser, buffer.maxIndex);\r\n      }\r\n      return buffer.maxIndex;\r\n    },\r\n\r\n    effectiveHeight(elements) {\r\n      if (!elements.length) {\r\n        return 0;\r\n      }\r\n      let top = Number.MAX_VALUE;\r\n      let bottom = Number.NEGATIVE_INFINITY;\r\n      elements.forEach((wrapper) => {\r\n        if (wrapper.element[0].offsetParent) {\r\n          // element style is not display:none\r\n          top = Math.min(top, wrapper.element.offset().top);\r\n          bottom = Math.max(bottom, wrapper.element.offset().top + wrapper.element.outerHeight(true));\r\n        }\r\n      });\r\n      return Math.max(0, bottom - top);\r\n    },\r\n\r\n    getItems() {\r\n      return buffer.filter(item => item.op === 'none');\r\n    },\r\n\r\n    getFirstItem() {\r\n      const list = buffer.getItems();\r\n      if (!list.length) {\r\n        return null;\r\n      }\r\n      return list[0].item;\r\n    },\r\n\r\n    getLastItem() {\r\n      const list = buffer.getItems();\r\n      if (!list.length) {\r\n        return null;\r\n      }\r\n      return list[list.length - 1].item;\r\n    }\r\n\r\n  });\r\n\r\n  buffer.reset(startIndex);\r\n\r\n  return buffer;\r\n}\r\n","// Can't just extend the Array, due to Babel does not support built-in classes extending\r\n// This solution was taken from https://stackoverflow.com/questions/46897414/es6-class-extends-array-workaround-for-es5-babel-transpile\r\nclass CacheProto {\r\n  add(item) {\r\n    for (let i = this.length - 1; i >= 0; i--) {\r\n      if (this[i].index === item.scope.$index) {\r\n        this[i].height = item.element.outerHeight();\r\n        return;\r\n      }\r\n    }\r\n    this.push({\r\n      index: item.scope.$index,\r\n      height: item.element.outerHeight()\r\n    });\r\n    this.sort((a, b) => ((a.index < b.index) ? -1 : ((a.index > b.index) ? 1 : 0)));\r\n  }\r\n\r\n  remove(argument, _isTop) {\r\n    const index = argument % 1 === 0 ? argument : argument.scope.$index;\r\n    const isTop = argument % 1 === 0 ? _isTop : argument._op === 'isTop';\r\n    for (let i = this.length - 1; i >= 0; i--) {\r\n      if (this[i].index === index) {\r\n        this.splice(i, 1);\r\n        break;\r\n      }\r\n    }\r\n    if(!isTop) {\r\n      for (let i = this.length - 1; i >= 0; i--) {\r\n        if (this[i].index > index) {\r\n          this[i].index--;\r\n        }\r\n      }\r\n    }\r\n  }\r\n\r\n  clear() {\r\n    this.length = 0;\r\n  }\r\n}\r\n\r\nfunction Cache() {\r\n  const instance = [];\r\n  instance.push.apply(instance, arguments);\r\n  Object.setPrototypeOf(instance, Cache.prototype);\r\n  return instance;\r\n}\r\nCache.prototype = Object.create(Array.prototype);\r\nObject.getOwnPropertyNames(CacheProto.prototype).forEach(methodName =>\r\n  Cache.prototype[methodName] = CacheProto.prototype[methodName]\r\n);\r\n\r\nfunction generateElement(template) {\r\n  if(template.nodeType !== Node.ELEMENT_NODE) {\r\n    throw new Error('ui-scroll directive requires an Element node for templating the view');\r\n  }\r\n  let element;\r\n  switch (template.tagName.toLowerCase()) {\r\n    case 'dl':\r\n      throw new Error(`ui-scroll directive does not support <${template.tagName}> as a repeating tag: ${template.outerHTML}`);\r\n    case 'tr':\r\n      let table = angular.element('<table><tr><td><div></div></td></tr></table>');\r\n      element = table.find('tr');\r\n      break;\r\n    case 'li':\r\n      element = angular.element('<li></li>');\r\n      break;\r\n    default:\r\n      element = angular.element('<div></div>');\r\n  }\r\n  return element;\r\n}\r\n\r\nclass Padding {\r\n  constructor(template) {\r\n    this.element = generateElement(template);\r\n    this.cache = new Cache();\r\n  }\r\n\r\n  height() {\r\n    return this.element.height.apply(this.element, arguments);\r\n  }\r\n}\r\n\r\nexport default Padding;","import Padding from './padding';\r\n\r\nexport default function Viewport(elementRoutines, buffer, element, viewportController, $rootScope, padding) {\r\n  let topPadding = null;\r\n  let bottomPadding = null;\r\n  const viewport = viewportController && viewportController.viewport ? viewportController.viewport : angular.element(window);\r\n  const container = viewportController && viewportController.container ? viewportController.container : undefined;\r\n  const scope = viewportController && viewportController.scope ? viewportController.scope : $rootScope;\r\n\r\n  viewport.css({\r\n    'overflow-anchor': 'none',\r\n    'overflow-y': 'auto',\r\n    'display': 'block'\r\n  });\r\n\r\n  function bufferPadding() {\r\n    return viewport.outerHeight() * padding; // some extra space to initiate preload\r\n  }\r\n\r\n  angular.extend(viewport, {\r\n    getScope() {\r\n      return scope;\r\n    },\r\n\r\n    createPaddingElements(template) {\r\n      topPadding = new Padding(template);\r\n      bottomPadding = new Padding(template);\r\n      element.before(topPadding.element);\r\n      element.after(bottomPadding.element);\r\n      topPadding.height(0);\r\n      bottomPadding.height(0);\r\n    },\r\n\r\n    applyContainerStyle() {\r\n      if (!container) {\r\n        return true;\r\n      }\r\n      if(container !== viewport) {\r\n        viewport.css('height', window.getComputedStyle(container[0]).height);\r\n      }\r\n      return viewport.height() > 0;\r\n    },\r\n\r\n    bottomDataPos() {\r\n      let scrollHeight = viewport[0].scrollHeight;\r\n      scrollHeight = scrollHeight != null ? scrollHeight : viewport[0].document.documentElement.scrollHeight;\r\n      return scrollHeight - bottomPadding.height();\r\n    },\r\n\r\n    topDataPos() {\r\n      return topPadding.height();\r\n    },\r\n\r\n    bottomVisiblePos() {\r\n      return viewport.scrollTop() + viewport.outerHeight();\r\n    },\r\n\r\n    topVisiblePos() {\r\n      return viewport.scrollTop();\r\n    },\r\n\r\n    insertElement(e, sibling) {\r\n      return elementRoutines.insertElement(e, sibling || topPadding.element);\r\n    },\r\n\r\n    insertElementAnimated(e, sibling) {\r\n      return elementRoutines.insertElementAnimated(e, sibling || topPadding.element);\r\n    },\r\n\r\n    shouldLoadBottom() {\r\n      return !buffer.eof && viewport.bottomDataPos() < viewport.bottomVisiblePos() + bufferPadding();\r\n    },\r\n\r\n    clipBottom() {\r\n      // clip the invisible items off the bottom\r\n      let overage = 0;\r\n      let overageHeight = 0;\r\n      let itemHeight = 0;\r\n      let emptySpaceHeight = viewport.bottomDataPos() - viewport.bottomVisiblePos() - bufferPadding();\r\n\r\n      for (let i = buffer.length - 1; i >= 0; i--) {\r\n        itemHeight = buffer[i].element.outerHeight(true);\r\n        if (overageHeight + itemHeight > emptySpaceHeight) {\r\n          break;\r\n        }\r\n        bottomPadding.cache.add(buffer[i]);\r\n        overageHeight += itemHeight;\r\n        overage++;\r\n      }\r\n\r\n      if (overage > 0) {\r\n        buffer.eof = false;\r\n        buffer.remove(buffer.length - overage, buffer.length);\r\n        buffer.next -= overage;\r\n        viewport.adjustPaddings();\r\n      }\r\n    },\r\n\r\n    shouldLoadTop() {\r\n      return !buffer.bof && (viewport.topDataPos() > viewport.topVisiblePos() - bufferPadding());\r\n    },\r\n\r\n    clipTop() {\r\n      // clip the invisible items off the top\r\n      let overage = 0;\r\n      let overageHeight = 0;\r\n      let itemHeight = 0;\r\n      let emptySpaceHeight = viewport.topVisiblePos() - viewport.topDataPos() - bufferPadding();\r\n\r\n      for (let i = 0; i < buffer.length; i++) {\r\n        itemHeight = buffer[i].element.outerHeight(true);\r\n        if (overageHeight + itemHeight > emptySpaceHeight) {\r\n          break;\r\n        }\r\n        topPadding.cache.add(buffer[i]);\r\n        overageHeight += itemHeight;\r\n        overage++;\r\n      }\r\n\r\n      if (overage > 0) {\r\n        // we need to adjust top padding element before items are removed from top\r\n        // to avoid strange behaviour of scroll bar during remove top items when we are at the very bottom\r\n        topPadding.height(topPadding.height() + overageHeight);\r\n        buffer.bof = false;\r\n        buffer.remove(0, overage);\r\n        buffer.first += overage;\r\n      }\r\n    },\r\n\r\n    adjustPaddings() {\r\n      if (!buffer.length) {\r\n        return;\r\n      }\r\n\r\n      // precise heights calculation based on items that are in buffer or that were in buffer once\r\n      const visibleItemsHeight = buffer.reduce((summ, item) => summ + item.element.outerHeight(true), 0);\r\n\r\n      let topPaddingHeight = 0, topCount = 0;\r\n      topPadding.cache.forEach(item => {\r\n        if(item.index < buffer.first) {\r\n          topPaddingHeight += item.height;\r\n          topCount++;\r\n        }\r\n      });\r\n\r\n      let bottomPaddingHeight = 0, bottomCount = 0;\r\n      bottomPadding.cache.forEach(item => {\r\n        if(item.index >= buffer.next) {\r\n          bottomPaddingHeight += item.height;\r\n          bottomCount++;\r\n        }\r\n      });\r\n\r\n      const totalHeight = visibleItemsHeight + topPaddingHeight + bottomPaddingHeight;\r\n      const averageItemHeight = totalHeight / (topCount + bottomCount + buffer.length);\r\n\r\n      // average heights calculation, items that have never been reached\r\n      let adjustTopPadding = buffer.minIndexUser !== null && buffer.minIndex > buffer.minIndexUser;\r\n      let adjustBottomPadding = buffer.maxIndexUser !== null && buffer.maxIndex < buffer.maxIndexUser;\r\n      let topPaddingHeightAdd = adjustTopPadding ? (buffer.minIndex - buffer.minIndexUser) * averageItemHeight : 0;\r\n      let bottomPaddingHeightAdd = adjustBottomPadding ? (buffer.maxIndexUser - buffer.maxIndex) * averageItemHeight : 0;\r\n\r\n      // paddings combine adjustment\r\n      topPadding.height(topPaddingHeight + topPaddingHeightAdd);\r\n      bottomPadding.height(bottomPaddingHeight + bottomPaddingHeightAdd);\r\n    },\r\n\r\n    onAfterMinIndexSet(topPaddingHeightOld) {\r\n      // additional scrollTop adjustment in case of datasource.minIndex external set\r\n      if (buffer.minIndexUser !== null && buffer.minIndex > buffer.minIndexUser) {\r\n        let diff = topPadding.height() - topPaddingHeightOld;\r\n        viewport.scrollTop(viewport.scrollTop() + diff);\r\n        while((diff -= viewport.scrollTop()) > 0) {\r\n          bottomPadding.height(bottomPadding.height() + diff);\r\n          viewport.scrollTop(viewport.scrollTop() + diff);\r\n        }\r\n      }\r\n    },\r\n\r\n    onAfterPrepend(updates) {\r\n      if (!updates.prepended.length) {\r\n        return;\r\n      }\r\n      const height = buffer.effectiveHeight(updates.prepended);\r\n      const paddingHeight = topPadding.height() - height;\r\n      if (paddingHeight >= 0) {\r\n        topPadding.height(paddingHeight);\r\n        return;\r\n      }\r\n      const position = viewport.scrollTop();\r\n      const newPosition = position - paddingHeight;\r\n      viewport.synthetic = { previous: position, next: newPosition };\r\n      topPadding.height(0);\r\n      viewport.scrollTop(newPosition);\r\n    },\r\n\r\n    resetTopPadding() {\r\n      topPadding.height(0);\r\n      topPadding.cache.clear();\r\n    },\r\n\r\n    resetBottomPadding() {\r\n      bottomPadding.height(0);\r\n      bottomPadding.cache.clear();\r\n    },\r\n\r\n    removeCacheItem(item, isTop) {\r\n      topPadding.cache.remove(item, isTop);\r\n      bottomPadding.cache.remove(item, isTop);\r\n    },\r\n\r\n    removeItem(item) {\r\n      this.removeCacheItem(item);\r\n      return buffer.remove(item);\r\n    }\r\n  });\r\n\r\n  return viewport;\r\n}\r\n","class Adapter {\r\n\r\n  constructor($scope, $parse, $attr, viewport, buffer, doAdjust, reload) {\r\n    this.$parse = $parse;\r\n    this.$attr = $attr;\r\n    this.viewport = viewport;\r\n    this.buffer = buffer;\r\n\r\n    this.doAdjust = doAdjust;\r\n    this.reload = reload;\r\n\r\n    this.isLoading = false;\r\n    this.disabled = false;\r\n\r\n    const viewportScope = viewport.getScope();\r\n    this.startScope = viewportScope.$parent ? viewportScope : $scope;\r\n\r\n    this.publicContext = {};\r\n    this.assignAdapter($attr.adapter);\r\n    this.generatePublicContext();\r\n  }\r\n\r\n  assignAdapter(adapterAttr) {\r\n    if (!adapterAttr || !(adapterAttr = adapterAttr.replace(/^\\s+|\\s+$/gm, ''))) {\r\n      return;\r\n    }\r\n    let adapterOnScope;\r\n\r\n    try {\r\n      this.$parse(adapterAttr).assign(this.startScope, {});\r\n      adapterOnScope = this.$parse(adapterAttr)(this.startScope);\r\n    }\r\n    catch (error) {\r\n      error.message = `Angular ui-scroll Adapter assignment exception.\\n` +\r\n        `Can't parse \"${adapterAttr}\" expression.\\n` +\r\n        error.message;\r\n      throw error;\r\n    }\r\n\r\n    angular.extend(adapterOnScope, this.publicContext);\r\n    this.publicContext = adapterOnScope;\r\n  }\r\n\r\n  generatePublicContext() {\r\n    // these methods will be accessible out of ui-scroll via user defined adapter\r\n    const publicMethods = ['reload', 'applyUpdates', 'append', 'prepend', 'isBOF', 'isEOF', 'isEmpty'];\r\n    for (let i = publicMethods.length - 1; i >= 0; i--) {\r\n      this.publicContext[publicMethods[i]] = this[publicMethods[i]].bind(this);\r\n    }\r\n\r\n    // these read-only props will be accessible out of ui-scroll via user defined adapter\r\n    const publicProps = ['isLoading', 'topVisible', 'topVisibleElement', 'topVisibleScope', 'bottomVisible', 'bottomVisibleElement', 'bottomVisibleScope'];\r\n    for (let i = publicProps.length - 1; i >= 0; i--) {\r\n      let property, attr = this.$attr[publicProps[i]];\r\n      Object.defineProperty(this, publicProps[i], {\r\n        get: () => property,\r\n        set: (value) => {\r\n          property = value;\r\n          this.publicContext[publicProps[i]] = value;\r\n          if (attr) {\r\n            this.$parse(attr).assign(this.startScope, value);\r\n          }\r\n        }\r\n      });\r\n    }\r\n\r\n    // read-only immediately calculated public properties\r\n    const publicPropsImmediate = ['bufferFirst', 'bufferLast', 'bufferLength'];\r\n    for (let i = publicPropsImmediate.length - 1; i >= 0; i--) {\r\n      Object.defineProperty(this.publicContext, publicPropsImmediate[i], {\r\n        get: () => this[publicPropsImmediate[i]]\r\n      });\r\n    }\r\n\r\n    // non-read-only public property\r\n    Object.defineProperty(this.publicContext, 'disabled', {\r\n      get: () => this.disabled,\r\n      set: (value) => (!(this.disabled = value)) ? this.doAdjust() : null\r\n    });\r\n  }\r\n\r\n  loading(value) {\r\n    this.isLoading = value;\r\n  }\r\n\r\n  isBOF() {\r\n    return this.buffer.bof;\r\n  }\r\n\r\n  isEOF() {\r\n    return this.buffer.eof;\r\n  }\r\n\r\n  isEmpty() {\r\n    return !this.buffer.length;\r\n  }\r\n\r\n  get bufferLength() {\r\n    return this.buffer.getItems().length;\r\n  }\r\n\r\n  get bufferFirst() {\r\n    return this.buffer.getFirstItem();\r\n  }\r\n\r\n  get bufferLast() {\r\n    return this.buffer.getLastItem();\r\n  }\r\n\r\n  append(newItems) {\r\n    this.buffer.append(newItems);\r\n    this.doAdjust();\r\n    this.viewport.clipTop();\r\n    this.viewport.clipBottom();\r\n  }\r\n\r\n  prepend(newItems, options = {}) {\r\n    this.buffer.prepend(newItems, options.immutableTop);\r\n    this.doAdjust();\r\n    this.viewport.clipTop();\r\n    this.viewport.clipBottom();\r\n  }\r\n\r\n  applyUpdates(arg1, arg2, arg3) {\r\n    if (typeof arg1 === 'function') {\r\n      this.applyUpdatesFunc(arg1, arg2);\r\n    } else {\r\n      this.applyUpdatesIndex(arg1, arg2, arg3);\r\n    }\r\n    this.doAdjust();\r\n  }\r\n\r\n  applyUpdatesFunc(cb, options = {}) {\r\n    this.buffer.slice(0).forEach((wrapper) => {\r\n      // we need to do it on the buffer clone, because buffer content\r\n      // may change as we iterate through\r\n      this.applyUpdate(wrapper, cb(wrapper.item, wrapper.scope, wrapper.element), options);\r\n    });\r\n  }\r\n\r\n  applyUpdatesIndex(index, newItems, options = {}) {\r\n    if (index % 1 !== 0) {\r\n      throw new Error('applyUpdates - ' + index + ' is not a valid index (should be an integer)');\r\n    }\r\n    const _index = index - this.buffer.first;\r\n\r\n    // apply updates only within buffer\r\n    if (_index >= 0 && _index < this.buffer.length) {\r\n      this.applyUpdate(this.buffer[_index], newItems, options);\r\n    }\r\n    // out-of-buffer case: deletion may affect Paddings\r\n    else if(index >= this.buffer.getAbsMinIndex() && index <= this.buffer.getAbsMaxIndex()) {\r\n      if(angular.isArray(newItems) && !newItems.length) {\r\n        this.viewport.removeCacheItem(index, !options.immutableTop && index === this.buffer.minIndex);\r\n        if (!options.immutableTop && index === this.buffer.getAbsMinIndex()) {\r\n          this.buffer.incrementMinIndex();\r\n        }\r\n        else {\r\n          this.buffer.decrementMaxIndex();\r\n        }\r\n      }\r\n    }\r\n  }\r\n\r\n  applyUpdate(wrapper, newItems, options = {}) {\r\n    if (!angular.isArray(newItems)) {\r\n      return;\r\n    }\r\n    let position = this.buffer.indexOf(wrapper);\r\n    if (!newItems.reverse().some(newItem => newItem === wrapper.item)) {\r\n      wrapper.op = 'remove';\r\n      if (!options.immutableTop && position === 0 && !newItems.length) {\r\n        wrapper._op = 'isTop'; // to catch \"first\" edge case on remove\r\n      }\r\n    }\r\n    newItems.forEach((newItem) => {\r\n      if (newItem === wrapper.item) {\r\n        position--;\r\n      } else {\r\n        // 3 parameter (isTop) is to catch \"first\" edge case on insert\r\n        this.buffer.insert(position + 1, newItem, !options.immutableTop && position === -1);\r\n      }\r\n    });\r\n  }\r\n\r\n  calculateProperties() {\r\n    let rowTop = null, topHeight = 0;\r\n    let topDone = false, bottomDone = false;\r\n    const length = this.buffer.length;\r\n\r\n    for (let i = 0; i < length; i++) {\r\n      const item = this.buffer[i];\r\n      const itemTop = item.element.offset().top;\r\n\r\n      if (rowTop !== itemTop) { // a new row condition\r\n        const itemHeight = item.element.outerHeight(true);\r\n        const top = this.viewport.topDataPos() + topHeight + itemHeight;\r\n\r\n        if (!topDone && top > this.viewport.topVisiblePos()) {\r\n          topDone = true;\r\n          this['topVisible'] = item.item;\r\n          this['topVisibleElement'] = item.element;\r\n          this['topVisibleScope'] = item.scope;\r\n        }\r\n        if (!bottomDone && (top >= this.viewport.bottomVisiblePos() || (i === length - 1 && this.isEOF()))) {\r\n          bottomDone = true;\r\n          this['bottomVisible'] = item.item;\r\n          this['bottomVisibleElement'] = item.element;\r\n          this['bottomVisibleScope'] = item.scope;\r\n        }\r\n        topHeight += itemHeight;\r\n      }\r\n      rowTop = itemTop;\r\n\r\n      if (topDone && bottomDone) {\r\n        break;\r\n      }\r\n    }\r\n  }\r\n\r\n}\r\n\r\nexport default Adapter;\r\n","import JQLiteExtras from './modules/jqLiteExtras';\nimport ElementRoutines from './modules/elementRoutines.js';\nimport ScrollBuffer from './modules/buffer.js';\nimport Viewport from './modules/viewport.js';\nimport Adapter from './modules/adapter.js';\n\nangular.module('ui.scroll', [])\n\n  .constant('JQLiteExtras', JQLiteExtras)\n  .run(['JQLiteExtras', (JQLiteExtras) => {\n    const elt = angular.element;\n    !(window.jQuery && elt.fn && elt.fn.jquery) ? (new JQLiteExtras()).registerFor(elt) : null;\n    ElementRoutines.addCSSRules();\n  }])\n\n  .directive('uiScrollViewport', function () {\n    return {\n      restrict: 'A',\n      controller: [\n        '$scope',\n        '$element',\n        function (scope, element) {\n          this.container = element;\n          this.viewport = element;\n          this.scope = scope;\n\n          angular.forEach(element.children(), child => {\n            if (child.tagName.toLowerCase() === 'tbody') {\n              this.viewport = angular.element(child);\n            }\n          });\n\n          return this;\n        }\n      ]\n    };\n  })\n\n  .directive('uiScroll', [\n    '$log',\n    '$injector',\n    '$rootScope',\n    '$timeout',\n    '$interval',\n    '$q',\n    '$parse',\n    function (console, $injector, $rootScope, $timeout, $interval, $q, $parse) {\n\n      return {\n        require: ['?^uiScrollViewport'],\n        restrict: 'A',\n        transclude: 'element',\n        priority: 1000,\n        terminal: true,\n        link: link\n      };\n\n      function link($scope, element, $attr, controllers, linker) {\n        const match = $attr.uiScroll.match(/^\\s*(\\w+)\\s+in\\s+([(\\w|\\$)\\.]+)\\s*$/);\n        if (!match) {\n          throw new Error('Expected uiScroll in form of \\'_item_ in _datasource_\\' but got \\'' + $attr.uiScroll + '\\'');\n        }\n\n        function parseNumber(value, defaultValue, isFloat) {\n          if (!isFloat) {\n            value = value === null ? defaultValue : Math.floor(value);\n          }\n          return isNaN(value) ? defaultValue : value;\n        }\n\n        function parseNumericAttr(value, defaultValue, isFloat) {\n          const result = $parse(value)($scope);\n          return parseNumber(result, defaultValue, isFloat);\n        }\n\n        function parseBooleanAttr(value, defaultValue) {\n          const result = $parse(value)($scope);\n          return typeof result === 'boolean' ? result : defaultValue;\n        }\n\n        const BUFFER_MIN = 3;\n        const BUFFER_DEFAULT = 10;\n        const PADDING_MIN = 0.3;\n        const PADDING_DEFAULT = 0.5;\n        const HANDLE_INERTIA_DEFAULT = true;\n        const START_INDEX_DEFAULT = 1;\n        const MAX_VIEWPORT_DELAY = 500;\n        const VIEWPORT_POLLING_INTERVAL = 50;\n\n        let datasource = null;\n        const itemName = match[1];\n        const datasourceName = match[2];\n        const viewportController = controllers[0];\n        const bufferSize = Math.max(BUFFER_MIN, parseNumericAttr($attr.bufferSize, BUFFER_DEFAULT));\n        const padding = Math.max(PADDING_MIN, parseNumericAttr($attr.padding, PADDING_DEFAULT, true));\n        const handleInertia = parseBooleanAttr($attr.handleInertia, HANDLE_INERTIA_DEFAULT);\n        let startIndex = parseNumericAttr($attr.startIndex, START_INDEX_DEFAULT);\n        let ridActual = 0; // current data revision id\n        let pending = [];\n\n        const elementRoutines = new ElementRoutines($injector, $q);\n        const buffer = new ScrollBuffer(elementRoutines, bufferSize, startIndex);\n        const viewport = new Viewport(elementRoutines, buffer, element, viewportController, $rootScope, padding);\n        const adapter = new Adapter($scope, $parse, $attr, viewport, buffer, doAdjust, reload);\n\n        if (viewportController) {\n          viewportController.adapter = adapter;\n        }\n\n        const isDatasourceValid = () =>\n          Object.prototype.toString.call(datasource) === '[object Object]' && typeof datasource.get === 'function';\n\n        datasource = $parse(datasourceName)($scope); // try to get datasource on scope\n        if (!isDatasourceValid()) {\n          datasource = $injector.get(datasourceName); // try to inject datasource as service\n          if (!isDatasourceValid()) {\n            throw new Error(datasourceName + ' is not a valid datasource');\n          }\n        }\n\n        let onRenderHandlers = [];\n        function onRenderHandlersRunner() {\n          onRenderHandlers.forEach(handler => handler.run());\n          onRenderHandlers = [];\n        }\n        function persistDatasourceIndex(datasource, propName) {\n          let getter;\n          // need to postpone min/maxIndexUser processing if the view is empty\n          if(angular.isNumber(datasource[propName])) {\n            getter = datasource[propName];\n            if(angular.isNumber(getter)) {\n              onRenderHandlers = onRenderHandlers.filter(handler => handler.id !== propName);\n              onRenderHandlers.push({\n                id: propName,\n                run: () => datasource[propName] = getter\n              });\n            }\n          }\n        }\n\n        function defineDatasourceIndex(datasource, propName, propUserName) {\n          const descriptor = Object.getOwnPropertyDescriptor(datasource, propName);\n          if (descriptor && (descriptor.set || descriptor.get)) {\n            return;\n          }\n          let getter;\n          persistDatasourceIndex(datasource, propName);\n          Object.defineProperty(datasource, propName, {\n            set: (value) => {\n              getter = value;\n              if(pending.length && !buffer.length) {\n                persistDatasourceIndex(datasource, propName);\n                return;\n              }\n              buffer[propUserName] = value;\n              const topPaddingHeightOld = viewport.topDataPos();\n              viewport.adjustPaddings();\n              if (propName === 'minIndex') {\n                viewport.onAfterMinIndexSet(topPaddingHeightOld);\n              }\n            },\n            get: () => getter\n          });\n        }\n\n        defineDatasourceIndex(datasource, 'minIndex', 'minIndexUser');\n        defineDatasourceIndex(datasource, 'maxIndex', 'maxIndexUser');\n\n        const fetchNext = (datasource.get.length !== 2) ?\n          (success) => datasource.get(buffer.next, bufferSize, success) :\n          (success) => {\n            datasource.get({\n              index: buffer.next,\n              append: buffer.length ? buffer[buffer.length - 1].item : void 0,\n              count: bufferSize\n            }, success);\n          };\n\n        const fetchPrevious = (datasource.get.length !== 2) ?\n          (success) => datasource.get(buffer.first - bufferSize, bufferSize, success) :\n          (success) => {\n            datasource.get({\n              index: buffer.first - bufferSize,\n              prepend: buffer.length ? buffer[0].item : void 0,\n              count: bufferSize\n            }, success);\n          };\n\n        const initialize = () => {\n          let tryCount = 0;\n          if(!viewport.applyContainerStyle()) {\n            const timer = $interval(() => {\n              tryCount++;\n              if(viewport.applyContainerStyle()) {\n                $interval.cancel(timer);\n                doAdjust();\n              }\n              if(tryCount * VIEWPORT_POLLING_INTERVAL >= MAX_VIEWPORT_DELAY) {\n                $interval.cancel(timer);\n                throw Error(`ui-scroll directive requires a viewport with non-zero height in ${MAX_VIEWPORT_DELAY}ms`);\n              }\n            }, VIEWPORT_POLLING_INTERVAL);\n          }\n          else {\n            doAdjust();\n          }\n        };\n\n        /**\n         * Build padding elements\n         *\n         * Calling linker is the only way I found to get access to the tag name of the template\n         * to prevent the directive scope from pollution a new scope is created and destroyed\n         * right after the builder creation is completed\n         */\n        linker((clone, scope) => {\n          viewport.createPaddingElements(clone[0]);\n          // we do not include the clone in the DOM. It means that the nested directives will not\n          // be able to reach the parent directives, but in this case it is intentional because we\n          // created the clone to access the template tag name\n          scope.$destroy();\n          clone.remove();\n        });\n\n        $scope.$on('$destroy', () => {\n          unbindEvents();\n          viewport.unbind('mousewheel', wheelHandler);\n        });\n\n        viewport.bind('mousewheel', wheelHandler);\n\n        initialize();\n\n        /* Private function definitions */\n\n        function isInvalid(rid) {\n          return (rid && rid !== ridActual) || $scope.$$destroyed;\n        }\n\n        function bindEvents() {\n          viewport.bind('resize', resizeAndScrollHandler);\n          viewport.bind('scroll', resizeAndScrollHandler);\n        }\n\n        function unbindEvents() {\n          viewport.unbind('resize', resizeAndScrollHandler);\n          viewport.unbind('scroll', resizeAndScrollHandler);\n        }\n\n        function reload() {\n          unbindEvents();\n          viewport.resetTopPadding();\n          viewport.resetBottomPadding();\n          if (arguments.length) {\n            startIndex = parseNumber(arguments[0], START_INDEX_DEFAULT, false);\n          }\n          buffer.reset(startIndex);\n          persistDatasourceIndex(datasource, 'minIndex');\n          persistDatasourceIndex(datasource, 'maxIndex');\n          doAdjust();\n        }\n\n        function isElementVisible(wrapper) {\n          return wrapper.element.height() && wrapper.element[0].offsetParent;\n        }\n\n        function visibilityWatcher(wrapper) {\n          if (isElementVisible(wrapper)) {\n            buffer.forEach((item) => {\n              if (typeof item.unregisterVisibilityWatcher === 'function') {\n                item.unregisterVisibilityWatcher();\n                delete item.unregisterVisibilityWatcher;\n              }\n            });\n            if (!pending.length) {\n              $timeout(() => doAdjust());\n            }\n          }\n        }\n\n        function insertWrapperContent(wrapper, insertAfter) {\n          createElement(wrapper, insertAfter, viewport.insertElement);\n          if (!isElementVisible(wrapper)) {\n            wrapper.unregisterVisibilityWatcher = wrapper.scope.$watch(() => visibilityWatcher(wrapper));\n          }\n          elementRoutines.hideElement(wrapper); // hide inserted elements before data binding\n        }\n\n        function createElement(wrapper, insertAfter, insertElement) {\n          let promises = null;\n          const sibling = (insertAfter > 0) ? buffer[insertAfter - 1].element : undefined;\n          linker((clone, scope) => {\n            promises = insertElement(clone, sibling);\n            wrapper.element = clone;\n            wrapper.scope = scope;\n            scope[itemName] = wrapper.item;\n          });\n          // ui-scroll-grid apply\n          if (adapter.transform) {\n            const tdInitializer = wrapper.scope.uiScrollTdInitializer;\n            if (tdInitializer && tdInitializer.linking) {\n              adapter.transform(wrapper.scope, wrapper.element);\n            } else {\n              wrapper.scope.uiScrollTdInitializer = {\n                onLink: () => adapter.transform(wrapper.scope, wrapper.element),\n                scope: wrapper.scope\n              };\n            }\n          }\n          return promises;\n        }\n\n        function updateDOM() {\n          let promises = [];\n          const toBePrepended = [];\n          const toBeRemoved = [];\n          const inserted = [];\n\n          buffer.forEach((wrapper, i) => {\n            switch (wrapper.op) {\n              case 'prepend':\n                toBePrepended.unshift(wrapper);\n                break;\n              case 'append':\n                insertWrapperContent(wrapper, i);\n                wrapper.op = 'none';\n                inserted.push(wrapper);\n                break;\n              case 'insert':\n                promises = promises.concat(createElement(wrapper, i, viewport.insertElementAnimated));\n                wrapper.op = 'none';\n                inserted.push(wrapper);\n                break;\n              case 'remove':\n                toBeRemoved.push(wrapper);\n            }\n          });\n\n          toBeRemoved.forEach((wrapper) => promises = promises.concat(viewport.removeItem(wrapper)));\n\n          if (toBePrepended.length)\n            toBePrepended.forEach((wrapper) => {\n              insertWrapperContent(wrapper);\n              wrapper.op = 'none';\n            });\n\n          buffer.forEach((item, i) => item.scope.$index = buffer.first + i);\n\n          return {\n            prepended: toBePrepended,\n            removed: toBeRemoved,\n            inserted: inserted,\n            animated: promises\n          };\n\n        }\n\n        function updatePaddings(rid, updates) {\n          // schedule another doAdjust after animation completion\n          if (updates.animated.length) {\n            $q.all(updates.animated).then(() => {\n              viewport.adjustPaddings();\n              doAdjust(rid);\n            });\n          } else {\n            viewport.adjustPaddings();\n          }\n        }\n\n        function enqueueFetch(rid, updates) {\n          if (viewport.shouldLoadBottom()) {\n            if (!updates || buffer.effectiveHeight(updates.inserted) > 0) {\n              // this means that at least one item appended in the last batch has height > 0\n              if (pending.push(true) === 1) {\n                adapter.loading(true);\n                fetch(rid);\n              }\n            }\n          } else if (viewport.shouldLoadTop()) {\n            if ((!updates || buffer.effectiveHeight(updates.prepended) > 0) || pending[0]) {\n              // this means that at least one item appended in the last batch has height > 0\n              // pending[0] = true means that previous fetch was appending. We need to force at least one prepend\n              // BTW there will always be at least 1 element in the pending array because bottom is fetched first\n              if (pending.push(false) === 1) {\n                adapter.loading(true);\n                fetch(rid);\n              }\n            }\n          }\n        }\n\n        function processUpdates() {\n          const updates = updateDOM();\n\n          // We need the item bindings to be processed before we can do adjustments\n          !$scope.$$phase && !$rootScope.$$phase && $scope.$digest();\n\n          updates.inserted.forEach(w => elementRoutines.showElement(w));\n          updates.prepended.forEach(w => elementRoutines.showElement(w));\n          return updates;\n        }\n\n        function doAdjust(rid) {\n          if (!rid) { // dismiss pending requests\n            pending = [];\n            rid = ++ridActual;\n          }\n\n          const updates = processUpdates();\n\n          if (isInvalid(rid)) {\n            return;\n          }\n\n          updatePaddings(rid, updates);\n          enqueueFetch(rid);\n\n          if (!pending.length) {\n            adapter.calculateProperties();\n          }\n        }\n\n        function doAdjustAfterFetch(rid) {\n          const updates = processUpdates();\n\n          viewport.onAfterPrepend(updates);\n\n          if (isInvalid(rid)) {\n            return;\n          }\n\n          updatePaddings(rid, updates);\n          onRenderHandlersRunner();\n          enqueueFetch(rid, updates);\n          pending.shift();\n\n          if (pending.length)\n            fetch(rid);\n          else {\n            adapter.loading(false);\n            bindEvents();\n            adapter.calculateProperties();\n          }\n        }\n\n        function fetch(rid) {\n          if (pending[0]) {// scrolling down\n            if (buffer.length && !viewport.shouldLoadBottom()) {\n              doAdjustAfterFetch(rid);\n            } else {\n              fetchNext((result) => {\n                if (isInvalid(rid)) {\n                  return;\n                }\n\n                if (result.length < bufferSize) {\n                  buffer.eof = true;\n                }\n\n                if (result.length > 0) {\n                  viewport.clipTop();\n                  buffer.append(result);\n                }\n\n                doAdjustAfterFetch(rid);\n              });\n            }\n          } else {  // scrolling up\n            if (buffer.length && !viewport.shouldLoadTop()) {\n              doAdjustAfterFetch(rid);\n            } else {\n              fetchPrevious((result) => {\n                if (isInvalid(rid)) {\n                  return;\n                }\n\n                if (result.length < bufferSize) {\n                  buffer.bof = true;\n                  // log 'bof is reached'\n                }\n\n                if (result.length > 0) {\n                  if (buffer.length) {\n                    viewport.clipBottom();\n                  }\n                  buffer.prepend(result);\n                }\n\n                doAdjustAfterFetch(rid);\n              });\n            }\n          }\n        }\n\n        function fixInertia() {\n          if (!viewport.synthetic) {\n            return;\n          }\n          const oldPosition = viewport.synthetic.previous;\n          const newPosition = viewport.synthetic.next;\n          if (viewport.scrollTop() !== newPosition) {\n            requestAnimationFrame(() => {\n              const position = viewport.scrollTop();\n              const diff = oldPosition - position;\n              if (diff > 0) { // inertia over synthetic\n                viewport.scrollTop(newPosition - diff);\n              } else {\n                viewport.scrollTop(newPosition);\n              }\n              viewport.synthetic = null;\n            });\n            return true;\n          }\n          viewport.synthetic = null;\n        }\n\n        function resizeAndScrollHandler() {\n          if (handleInertia && fixInertia()) {\n            return;\n          }\n          if (!$rootScope.$$phase && !adapter.isLoading && !adapter.disabled) {\n\n            enqueueFetch(ridActual);\n\n            if (pending.length) {\n              unbindEvents();\n            } else {\n              adapter.calculateProperties();\n              !$scope.$$phase && $scope.$digest();\n            }\n          }\n        }\n\n        function wheelHandler(event) {\n          if (!adapter.disabled) {\n            const scrollTop = viewport[0].scrollTop;\n            const yMax = viewport[0].scrollHeight - viewport[0].clientHeight;\n\n            if ((scrollTop === 0 && !buffer.bof) || (scrollTop === yMax && !buffer.eof)) {\n              event.preventDefault();\n            }\n          }\n        }\n      }\n\n    }\n  ]);\n"],"sourceRoot":""}