primevue/virtualscroller/index.mjs

PrimeVue is an open source UI library for Vue featuring a rich set of 80+ components, a theme designer, various theme alternatives such as Material, Bootstrap, Tailwind, premium templates and professional support. In addition, it integrates with PrimeBloc

import { findSingle, isVisible, getWidth, getHeight } from '@primeuix/utils/dom';
import SpinnerIcon from '@primevue/icons/spinner';
import BaseComponent from '@primevue/core/basecomponent';
import VirtualScrollerStyle from 'primevue/virtualscroller/style';
import { resolveComponent, createElementBlock, openBlock, mergeProps, renderSlot, createCommentVNode, createElementVNode, Fragment, renderList, createVNode } from 'vue';

var script$1 = {
  name: 'BaseVirtualScroller',
  "extends": BaseComponent,
  props: {
    id: {
      type: String,
      "default": null
    },
    style: null,
    "class": null,
    items: {
      type: Array,
      "default": null
    },
    itemSize: {
      type: [Number, Array],
      "default": 0
    },
    scrollHeight: null,
    scrollWidth: null,
    orientation: {
      type: String,
      "default": 'vertical'
    },
    numToleratedItems: {
      type: Number,
      "default": null
    },
    delay: {
      type: Number,
      "default": 0
    },
    resizeDelay: {
      type: Number,
      "default": 10
    },
    lazy: {
      type: Boolean,
      "default": false
    },
    disabled: {
      type: Boolean,
      "default": false
    },
    loaderDisabled: {
      type: Boolean,
      "default": false
    },
    columns: {
      type: Array,
      "default": null
    },
    loading: {
      type: Boolean,
      "default": false
    },
    showSpacer: {
      type: Boolean,
      "default": true
    },
    showLoader: {
      type: Boolean,
      "default": false
    },
    tabindex: {
      type: Number,
      "default": 0
    },
    inline: {
      type: Boolean,
      "default": false
    },
    step: {
      type: Number,
      "default": 0
    },
    appendOnly: {
      type: Boolean,
      "default": false
    },
    autoSize: {
      type: Boolean,
      "default": false
    }
  },
  style: VirtualScrollerStyle,
  provide: function provide() {
    return {
      $pcVirtualScroller: this,
      $parentInstance: this
    };
  },
  beforeMount: function beforeMount() {
    var _this$$primevueConfig;
    VirtualScrollerStyle.loadCSS({
      nonce: (_this$$primevueConfig = this.$primevueConfig) === null || _this$$primevueConfig === void 0 || (_this$$primevueConfig = _this$$primevueConfig.csp) === null || _this$$primevueConfig === void 0 ? void 0 : _this$$primevueConfig.nonce
    });
  }
};

function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), true).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
function _defineProperty(e, r, t) { return (r = _toPropertyKey(r)) in e ? Object.defineProperty(e, r, { value: t, enumerable: true, configurable: true, writable: true }) : e[r] = t, e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
var script = {
  name: 'VirtualScroller',
  "extends": script$1,
  inheritAttrs: false,
  emits: ['update:numToleratedItems', 'scroll', 'scroll-index-change', 'lazy-load'],
  data: function data() {
    var both = this.isBoth();
    return {
      first: both ? {
        rows: 0,
        cols: 0
      } : 0,
      last: both ? {
        rows: 0,
        cols: 0
      } : 0,
      page: both ? {
        rows: 0,
        cols: 0
      } : 0,
      numItemsInViewport: both ? {
        rows: 0,
        cols: 0
      } : 0,
      lastScrollPos: both ? {
        top: 0,
        left: 0
      } : 0,
      d_numToleratedItems: this.numToleratedItems,
      d_loading: this.loading,
      loaderArr: [],
      spacerStyle: {},
      contentStyle: {}
    };
  },
  element: null,
  content: null,
  lastScrollPos: null,
  scrollTimeout: null,
  resizeTimeout: null,
  defaultWidth: 0,
  defaultHeight: 0,
  defaultContentWidth: 0,
  defaultContentHeight: 0,
  isRangeChanged: false,
  lazyLoadState: {},
  resizeListener: null,
  resizeObserver: null,
  initialized: false,
  watch: {
    numToleratedItems: function numToleratedItems(newValue) {
      this.d_numToleratedItems = newValue;
    },
    loading: function loading(newValue, oldValue) {
      if (this.lazy && newValue !== oldValue && newValue !== this.d_loading) {
        this.d_loading = newValue;
      }
    },
    items: {
      handler: function handler(newValue, oldValue) {
        if (!oldValue || oldValue.length !== (newValue || []).length) {
          this.init();
          this.calculateAutoSize();
        }
      },
      deep: true
    },
    itemSize: function itemSize() {
      this.init();
      this.calculateAutoSize();
    },
    orientation: function orientation() {
      this.lastScrollPos = this.isBoth() ? {
        top: 0,
        left: 0
      } : 0;
    },
    scrollHeight: function scrollHeight() {
      this.init();
      this.calculateAutoSize();
    },
    scrollWidth: function scrollWidth() {
      this.init();
      this.calculateAutoSize();
    }
  },
  mounted: function mounted() {
    this.viewInit();
    this.lastScrollPos = this.isBoth() ? {
      top: 0,
      left: 0
    } : 0;
    this.lazyLoadState = this.lazyLoadState || {};
  },
  updated: function updated() {
    !this.initialized && this.viewInit();
  },
  unmounted: function unmounted() {
    this.unbindResizeListener();
    this.initialized = false;
  },
  methods: {
    viewInit: function viewInit() {
      if (isVisible(this.element)) {
        this.setContentEl(this.content);
        this.init();
        this.calculateAutoSize();
        this.bindResizeListener();
        this.defaultWidth = getWidth(this.element);
        this.defaultHeight = getHeight(this.element);
        this.defaultContentWidth = getWidth(this.content);
        this.defaultContentHeight = getHeight(this.content);
        this.initialized = true;
      }
    },
    init: function init() {
      if (!this.disabled) {
        this.setSize();
        this.calculateOptions();
        this.setSpacerSize();
      }
    },
    isVertical: function isVertical() {
      return this.orientation === 'vertical';
    },
    isHorizontal: function isHorizontal() {
      return this.orientation === 'horizontal';
    },
    isBoth: function isBoth() {
      return this.orientation === 'both';
    },
    scrollTo: function scrollTo(options) {
      //this.lastScrollPos = this.both ? { top: 0, left: 0 } : 0;
      this.element && this.element.scrollTo(options);
    },
    scrollToIndex: function scrollToIndex(index) {
      var _this = this;
      var behavior = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'auto';
      var both = this.isBoth();
      var horizontal = this.isHorizontal();
      var valid = both ? index.every(function (i) {
        return i > -1;
      }) : index > -1;
      if (valid) {
        var first = this.first;
        var _this$element = this.element,
          _this$element$scrollT = _this$element.scrollTop,
          scrollTop = _this$element$scrollT === void 0 ? 0 : _this$element$scrollT,
          _this$element$scrollL = _this$element.scrollLeft,
          scrollLeft = _this$element$scrollL === void 0 ? 0 : _this$element$scrollL;
        var _this$calculateNumIte = this.calculateNumItems(),
          numToleratedItems = _this$calculateNumIte.numToleratedItems;
        var contentPos = this.getContentPosition();
        var itemSize = this.itemSize;
        var calculateFirst = function calculateFirst() {
          var _index = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;
          var _numT = arguments.length > 1 ? arguments[1] : undefined;
          return _index <= _numT ? 0 : _index;
        };
        var calculateCoord = function calculateCoord(_first, _size, _cpos) {
          return _first * _size + _cpos;
        };
        var scrollTo = function scrollTo() {
          var left = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;
          var top = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
          return _this.scrollTo({
            left: left,
            top: top,
            behavior: behavior
          });
        };
        var newFirst = both ? {
          rows: 0,
          cols: 0
        } : 0;
        var isRangeChanged = false,
          isScrollChanged = false;
        if (both) {
          newFirst = {
            rows: calculateFirst(index[0], numToleratedItems[0]),
            cols: calculateFirst(index[1], numToleratedItems[1])
          };
          scrollTo(calculateCoord(newFirst.cols, itemSize[1], contentPos.left), calculateCoord(newFirst.rows, itemSize[0], contentPos.top));
          isScrollChanged = this.lastScrollPos.top !== scrollTop || this.lastScrollPos.left !== scrollLeft;
          isRangeChanged = newFirst.rows !== first.rows || newFirst.cols !== first.cols;
        } else {
          newFirst = calculateFirst(index, numToleratedItems);
          horizontal ? scrollTo(calculateCoord(newFirst, itemSize, contentPos.left), scrollTop) : scrollTo(scrollLeft, calculateCoord(newFirst, itemSize, contentPos.top));
          isScrollChanged = this.lastScrollPos !== (horizontal ? scrollLeft : scrollTop);
          isRangeChanged = newFirst !== first;
        }
        this.isRangeChanged = isRangeChanged;
        isScrollChanged && (this.first = newFirst);
      }
    },
    scrollInView: function scrollInView(index, to) {
      var _this2 = this;
      var behavior = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 'auto';
      if (to) {
        var both = this.isBoth();
        var horizontal = this.isHorizontal();
        var valid = both ? index.every(function (i) {
          return i > -1;
        }) : index > -1;
        if (valid) {
          var _this$getRenderedRang = this.getRenderedRange(),
            first = _this$getRenderedRang.first,
            viewport = _this$getRenderedRang.viewport;
          var scrollTo = function scrollTo() {
            var left = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;
            var top = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
            return _this2.scrollTo({
              left: left,
              top: top,
              behavior: behavior
            });
          };
          var isToStart = to === 'to-start';
          var isToEnd = to === 'to-end';
          if (isToStart) {
            if (both) {
              if (viewport.first.rows - first.rows > index[0]) {
                scrollTo(viewport.first.cols * this.itemSize[1], (viewport.first.rows - 1) * this.itemSize[0]);
              } else if (viewport.first.cols - first.cols > index[1]) {
                scrollTo((viewport.first.cols - 1) * this.itemSize[1], viewport.first.rows * this.itemSize[0]);
              }
            } else {
              if (viewport.first - first > index) {
                var pos = (viewport.first - 1) * this.itemSize;
                horizontal ? scrollTo(pos, 0) : scrollTo(0, pos);
              }
            }
          } else if (isToEnd) {
            if (both) {
              if (viewport.last.rows - first.rows <= index[0] + 1) {
                scrollTo(viewport.first.cols * this.itemSize[1], (viewport.first.rows + 1) * this.itemSize[0]);
              } else if (viewport.last.cols - first.cols <= index[1] + 1) {
                scrollTo((viewport.first.cols + 1) * this.itemSize[1], viewport.first.rows * this.itemSize[0]);
              }
            } else {
              if (viewport.last - first <= index + 1) {
                var _pos2 = (viewport.first + 1) * this.itemSize;
                horizontal ? scrollTo(_pos2, 0) : scrollTo(0, _pos2);
              }
            }
          }
        }
      } else {
        this.scrollToIndex(index, behavior);
      }
    },
    getRenderedRange: function getRenderedRange() {
      var calculateFirstInViewport = function calculateFirstInViewport(_pos, _size) {
        return Math.floor(_pos / (_size || _pos));
      };
      var firstInViewport = this.first;
      var lastInViewport = 0;
      if (this.element) {
        var both = this.isBoth();
        var horizontal = this.isHorizontal();
        var _this$element2 = this.element,
          scrollTop = _this$element2.scrollTop,
          scrollLeft = _this$element2.scrollLeft;
        if (both) {
          firstInViewport = {
            rows: calculateFirstInViewport(scrollTop, this.itemSize[0]),
            cols: calculateFirstInViewport(scrollLeft, this.itemSize[1])
          };
          lastInViewport = {
            rows: firstInViewport.rows + this.numItemsInViewport.rows,
            cols: firstInViewport.cols + this.numItemsInViewport.cols
          };
        } else {
          var scrollPos = horizontal ? scrollLeft : scrollTop;
          firstInViewport = calculateFirstInViewport(scrollPos, this.itemSize);
          lastInViewport = firstInViewport + this.numItemsInViewport;
        }
      }
      return {
        first: this.first,
        last: this.last,
        viewport: {
          first: firstInViewport,
          last: lastInViewport
        }
      };
    },
    calculateNumItems: function calculateNumItems() {
      var both = this.isBoth();
      var horizontal = this.isHorizontal();
      var itemSize = this.itemSize;
      var contentPos = this.getContentPosition();
      var contentWidth = this.element ? this.element.offsetWidth - contentPos.left : 0;
      var contentHeight = this.element ? this.element.offsetHeight - contentPos.top : 0;
      var calculateNumItemsInViewport = function calculateNumItemsInViewport(_contentSize, _itemSize) {
        return Math.ceil(_contentSize / (_itemSize || _contentSize));
      };
      var calculateNumToleratedItems = function calculateNumToleratedItems(_numItems) {
        return Math.ceil(_numItems / 2);
      };
      var numItemsInViewport = both ? {
        rows: calculateNumItemsInViewport(contentHeight, itemSize[0]),
        cols: calculateNumItemsInViewport(contentWidth, itemSize[1])
      } : calculateNumItemsInViewport(horizontal ? contentWidth : contentHeight, itemSize);
      var numToleratedItems = this.d_numToleratedItems || (both ? [calculateNumToleratedItems(numItemsInViewport.rows), calculateNumToleratedItems(numItemsInViewport.cols)] : calculateNumToleratedItems(numItemsInViewport));
      return {
        numItemsInViewport: numItemsInViewport,
        numToleratedItems: numToleratedItems
      };
    },
    calculateOptions: function calculateOptions() {
      var _this3 = this;
      var both = this.isBoth();
      var first = this.first;
      var _this$calculateNumIte2 = this.calculateNumItems(),
        numItemsInViewport = _this$calculateNumIte2.numItemsInViewport,
        numToleratedItems = _this$calculateNumIte2.numToleratedItems;
      var calculateLast = function calculateLast(_first, _num, _numT) {
        var _isCols = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
        return _this3.getLast(_first + _num + (_first < _numT ? 2 : 3) * _numT, _isCols);
      };
      var last = both ? {
        rows: calculateLast(first.rows, numItemsInViewport.rows, numToleratedItems[0]),
        cols: calculateLast(first.cols, numItemsInViewport.cols, numToleratedItems[1], true)
      } : calculateLast(first, numItemsInViewport, numToleratedItems);
      this.last = last;
      this.numItemsInViewport = numItemsInViewport;
      this.d_numToleratedItems = numToleratedItems;
      this.$emit('update:numToleratedItems', this.d_numToleratedItems);
      if (this.showLoader) {
        this.loaderArr = both ? Array.from({
          length: numItemsInViewport.rows
        }).map(function () {
          return Array.from({
            length: numItemsInViewport.cols
          });
        }) : Array.from({
          length: numItemsInViewport
        });
      }
      if (this.lazy) {
        Promise.resolve().then(function () {
          var _this3$items;
          _this3.lazyLoadState = {
            first: _this3.step ? both ? {
              rows: 0,
              cols: first.cols
            } : 0 : first,
            last: Math.min(_this3.step ? _this3.step : last, ((_this3$items = _this3.items) === null || _this3$items === void 0 ? void 0 : _this3$items.length) || 0)
          };
          _this3.$emit('lazy-load', _this3.lazyLoadState);
        });
      }
    },
    calculateAutoSize: function calculateAutoSize() {
      var _this4 = this;
      if (this.autoSize && !this.d_loading) {
        Promise.resolve().then(function () {
          if (_this4.content) {
            var both = _this4.isBoth();
            var horizontal = _this4.isHorizontal();
            var vertical = _this4.isVertical();
            _this4.content.style.minHeight = _this4.content.style.minWidth = 'auto';
            _this4.content.style.position = 'relative';
            _this4.element.style.contain = 'none';

            /*const [contentWidth, contentHeight] = [getWidth(this.content), getHeight(this.content)];
             contentWidth !== this.defaultContentWidth && (this.element.style.width = '');
            contentHeight !== this.defaultContentHeight && (this.element.style.height = '');*/

            var _ref = [getWidth(_this4.element), getHeight(_this4.element)],
              width = _ref[0],
              height = _ref[1];
            (both || horizontal) && (_this4.element.style.width = width < _this4.defaultWidth ? width + 'px' : _this4.scrollWidth || _this4.defaultWidth + 'px');
            (both || vertical) && (_this4.element.style.height = height < _this4.defaultHeight ? height + 'px' : _this4.scrollHeight || _this4.defaultHeight + 'px');
            _this4.content.style.minHeight = _this4.content.style.minWidth = '';
            _this4.content.style.position = '';
            _this4.element.style.contain = '';
          }
        });
      }
    },
    getLast: function getLast() {
      var _ref2, _this$items;
      var last = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;
      var isCols = arguments.length > 1 ? arguments[1] : undefined;
      return this.items ? Math.min(isCols ? ((_ref2 = this.columns || this.items[0]) === null || _ref2 === void 0 ? void 0 : _ref2.length) || 0 : ((_this$items = this.items) === null || _this$items === void 0 ? void 0 : _this$items.length) || 0, last) : 0;
    },
    getContentPosition: function getContentPosition() {
      if (this.content) {
        var style = getComputedStyle(this.content);
        var left = parseFloat(style.paddingLeft) + Math.max(parseFloat(style.left) || 0, 0);
        var right = parseFloat(style.paddingRight) + Math.max(parseFloat(style.right) || 0, 0);
        var top = parseFloat(style.paddingTop) + Math.max(parseFloat(style.top) || 0, 0);
        var bottom = parseFloat(style.paddingBottom) + Math.max(parseFloat(style.bottom) || 0, 0);
        return {
          left: left,
          right: right,
          top: top,
          bottom: bottom,
          x: left + right,
          y: top + bottom
        };
      }
      return {
        left: 0,
        right: 0,
        top: 0,
        bottom: 0,
        x: 0,
        y: 0
      };
    },
    setSize: function setSize() {
      var _this5 = this;
      if (this.element) {
        var both = this.isBoth();
        var horizontal = this.isHorizontal();
        var parentElement = this.element.parentElement;
        var width = this.scrollWidth || "".concat(this.element.offsetWidth || parentElement.offsetWidth, "px");
        var height = this.scrollHeight || "".concat(this.element.offsetHeight || parentElement.offsetHeight, "px");
        var setProp = function setProp(_name, _value) {
          return _this5.element.style[_name] = _value;
        };
        if (both || horizontal) {
          setProp('height', height);
          setProp('width', width);
        } else {
          setProp('height', height);
        }
      }
    },
    setSpacerSize: function setSpacerSize() {
      var _this6 = this;
      var items = this.items;
      if (items) {
        var both = this.isBoth();
        var horizontal = this.isHorizontal();
        var contentPos = this.getContentPosition();
        var setProp = function setProp(_name, _value, _size) {
          var _cpos = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 0;
          return _this6.spacerStyle = _objectSpread(_objectSpread({}, _this6.spacerStyle), _defineProperty({}, "".concat(_name), (_value || []).length * _size + _cpos + 'px'));
        };
        if (both) {
          setProp('height', items, this.itemSize[0], contentPos.y);
          setProp('width', this.columns || items[1], this.itemSize[1], contentPos.x);
        } else {
          horizontal ? setProp('width', this.columns || items, this.itemSize, contentPos.x) : setProp('height', items, this.itemSize, contentPos.y);
        }
      }
    },
    setContentPosition: function setContentPosition(pos) {
      var _this7 = this;
      if (this.content && !this.appendOnly) {
        var both = this.isBoth();
        var horizontal = this.isHorizontal();
        var first = pos ? pos.first : this.first;
        var calculateTranslateVal = function calculateTranslateVal(_first, _size) {
          return _first * _size;
        };
        var setTransform = function setTransform() {
          var _x = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;
          var _y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
          return _this7.contentStyle = _objectSpread(_objectSpread({}, _this7.contentStyle), {
            transform: "translate3d(".concat(_x, "px, ").concat(_y, "px, 0)")
          });
        };
        if (both) {
          setTransform(calculateTranslateVal(first.cols, this.itemSize[1]), calculateTranslateVal(first.rows, this.itemSize[0]));
        } else {
          var translateVal = calculateTranslateVal(first, this.itemSize);
          horizontal ? setTransform(translateVal, 0) : setTransform(0, translateVal);
        }
      }
    },
    onScrollPositionChange: function onScrollPositionChange(event) {
      var _this8 = this;
      var target = event.target;
      var both = this.isBoth();
      var horizontal = this.isHorizontal();
      var contentPos = this.getContentPosition();
      var calculateScrollPos = function calculateScrollPos(_pos, _cpos) {
        return _pos ? _pos > _cpos ? _pos - _cpos : _pos : 0;
      };
      var calculateCurrentIndex = function calculateCurrentIndex(_pos, _size) {
        return Math.floor(_pos / (_size || _pos));
      };
      var calculateTriggerIndex = function calculateTriggerIndex(_currentIndex, _first, _last, _num, _numT, _isScrollDownOrRight) {
        return _currentIndex <= _numT ? _numT : _isScrollDownOrRight ? _last - _num - _numT : _first + _numT - 1;
      };
      var calculateFirst = function calculateFirst(_currentIndex, _triggerIndex, _first, _last, _num, _numT, _isScrollDownOrRight, _isCols) {
        if (_currentIndex <= _numT) return 0;
        var firstValue = Math.max(0, _isScrollDownOrRight ? _currentIndex < _triggerIndex ? _first : _currentIndex - _numT : _currentIndex > _triggerIndex ? _first : _currentIndex - 2 * _numT);
        var maxFirst = _this8.getLast(firstValue, _isCols);
        if (firstValue > maxFirst) return maxFirst - _num;else return firstValue;
      };
      var calculateLast = function calculateLast(_currentIndex, _first, _last, _num, _numT, _isCols) {
        var lastValue = _first + _num + 2 * _numT;
        if (_currentIndex >= _numT) {
          lastValue += _numT + 1;
        }
        return _this8.getLast(lastValue, _isCols);
      };
      var scrollTop = calculateScrollPos(target.scrollTop, contentPos.top);
      var scrollLeft = calculateScrollPos(target.scrollLeft, contentPos.left);
      var newFirst = both ? {
        rows: 0,
        cols: 0
      } : 0;
      var newLast = this.last;
      var isRangeChanged = false;
      var newScrollPos = this.lastScrollPos;
      if (both) {
        var isScrollDown = this.lastScrollPos.top <= scrollTop;
        var isScrollRight = this.lastScrollPos.left <= scrollLeft;
        if (!this.appendOnly || this.appendOnly && (isScrollDown || isScrollRight)) {
          var currentIndex = {
            rows: calculateCurrentIndex(scrollTop, this.itemSize[0]),
            cols: calculateCurrentIndex(scrollLeft, this.itemSize[1])
          };
          var triggerIndex = {
            rows: calculateTriggerIndex(currentIndex.rows, this.first.rows, this.last.rows, this.numItemsInViewport.rows, this.d_numToleratedItems[0], isScrollDown),
            cols: calculateTriggerIndex(currentIndex.cols, this.first.cols, this.last.cols, this.numItemsInViewport.cols, this.d_numToleratedItems[1], isScrollRight)
          };
          newFirst = {
            rows: calculateFirst(currentIndex.rows, triggerIndex.rows, this.first.rows, this.last.rows, this.numItemsInViewport.rows, this.d_numToleratedItems[0], isScrollDown),
            cols: calculateFirst(currentIndex.cols, triggerIndex.cols, this.first.cols, this.last.cols, this.numItemsInViewport.cols, this.d_numToleratedItems[1], isScrollRight, true)
          };
          newLast = {
            rows: calculateLast(currentIndex.rows, newFirst.rows, this.last.rows, this.numItemsInViewport.rows, this.d_numToleratedItems[0]),
            cols: calculateLast(currentIndex.cols, newFirst.cols, this.last.cols, this.numItemsInViewport.cols, this.d_numToleratedItems[1], true)
          };
          isRangeChanged = newFirst.rows !== this.first.rows || newLast.rows !== this.last.rows || newFirst.cols !== this.first.cols || newLast.cols !== this.last.cols || this.isRangeChanged;
          newScrollPos = {
            top: scrollTop,
            left: scrollLeft
          };
        }
      } else {
        var scrollPos = horizontal ? scrollLeft : scrollTop;
        var isScrollDownOrRight = this.lastScrollPos <= scrollPos;
        if (!this.appendOnly || this.appendOnly && isScrollDownOrRight) {
          var _currentIndex2 = calculateCurrentIndex(scrollPos, this.itemSize);
          var _triggerIndex2 = calculateTriggerIndex(_currentIndex2, this.first, this.last, this.numItemsInViewport, this.d_numToleratedItems, isScrollDownOrRight);
          newFirst = calculateFirst(_currentIndex2, _triggerIndex2, this.first, this.last, this.numItemsInViewport, this.d_numToleratedItems, isScrollDownOrRight);
          newLast = calculateLast(_currentIndex2, newFirst, this.last, this.numItemsInViewport, this.d_numToleratedItems);
          isRangeChanged = newFirst !== this.first || newLast !== this.last || this.isRangeChanged;
          newScrollPos = scrollPos;
        }
      }
      return {
        first: newFirst,
        last: newLast,
        isRangeChanged: isRangeChanged,
        scrollPos: newScrollPos
      };
    },
    onScrollChange: function onScrollChange(event) {
      var _this$onScrollPositio = this.onScrollPositionChange(event),
        first = _this$onScrollPositio.first,
        last = _this$onScrollPositio.last,
        isRangeChanged = _this$onScrollPositio.isRangeChanged,
        scrollPos = _this$onScrollPositio.scrollPos;
      if (isRangeChanged) {
        var newState = {
          first: first,
          last: last
        };
        this.setContentPosition(newState);
        this.first = first;
        this.last = last;
        this.lastScrollPos = scrollPos;
        this.$emit('scroll-index-change', newState);
        if (this.lazy && this.isPageChanged(first)) {
          var _this$items2, _this$items3;
          var lazyLoadState = {
            first: this.step ? Math.min(this.getPageByFirst(first) * this.step, (((_this$items2 = this.items) === null || _this$items2 === void 0 ? void 0 : _this$items2.length) || 0) - this.step) : first,
            last: Math.min(this.step ? (this.getPageByFirst(first) + 1) * this.step : last, ((_this$items3 = this.items) === null || _this$items3 === void 0 ? void 0 : _this$items3.length) || 0)
          };
          var isLazyStateChanged = this.lazyLoadState.first !== lazyLoadState.first || this.lazyLoadState.last !== lazyLoadState.last;
          isLazyStateChanged && this.$emit('lazy-load', lazyLoadState);
          this.lazyLoadState = lazyLoadState;
        }
      }
    },
    onScroll: function onScroll(event) {
      var _this9 = this;
      this.$emit('scroll', event);
      if (this.delay) {
        if (this.scrollTimeout) {
          clearTimeout(this.scrollTimeout);
        }
        if (this.isPageChanged()) {
          if (!this.d_loading && this.showLoader) {
            var _this$onScrollPositio2 = this.onScrollPositionChange(event),
              isRangeChanged = _this$onScrollPositio2.isRangeChanged;
            var changed = isRangeChanged || (this.step ? this.isPageChanged() : false);
            changed && (this.d_loading = true);
          }
          this.scrollTimeout = setTimeout(function () {
            _this9.onScrollChange(event);
            if (_this9.d_loading && _this9.showLoader && (!_this9.lazy || _this9.loading === undefined)) {
              _this9.d_loading = false;
              _this9.page = _this9.getPageByFirst();
            }
          }, this.delay);
        }
      } else {
        this.onScrollChange(event);
      }
    },
    onResize: function onResize() {
      var _this10 = this;
      if (this.resizeTimeout) {
        clearTimeout(this.resizeTimeout);
      }
      this.resizeTimeout = setTimeout(function () {
        if (isVisible(_this10.element)) {
          var both = _this10.isBoth();
          var vertical = _this10.isVertical();
          var horizontal = _this10.isHorizontal();
          var _ref3 = [getWidth(_this10.element), getHeight(_this10.element)],
            width = _ref3[0],
            height = _ref3[1];
          var isDiffWidth = width !== _this10.defaultWidth,
            isDiffHeight = height !== _this10.defaultHeight;
          var reinit = both ? isDiffWidth || isDiffHeight : horizontal ? isDiffWidth : vertical ? isDiffHeight : false;
          if (reinit) {
            _this10.d_numToleratedItems = _this10.numToleratedItems;
            _this10.defaultWidth = width;
            _this10.defaultHeight = height;
            _this10.defaultContentWidth = getWidth(_this10.content);
            _this10.defaultContentHeight = getHeight(_this10.content);
            _this10.init();
          }
        }
      }, this.resizeDelay);
    },
    bindResizeListener: function bindResizeListener() {
      var _this11 = this;
      if (!this.resizeListener) {
        this.resizeListener = this.onResize.bind(this);
        window.addEventListener('resize', this.resizeListener);
        window.addEventListener('orientationchange', this.resizeListener);
        this.resizeObserver = new ResizeObserver(function () {
          _this11.onResize();
        });
        this.resizeObserver.observe(this.element);
      }
    },
    unbindResizeListener: function unbindResizeListener() {
      if (this.resizeListener) {
        window.removeEventListener('resize', this.resizeListener);
        window.removeEventListener('orientationchange', this.resizeListener);
        this.resizeListener = null;
      }
      if (this.resizeObserver) {
        this.resizeObserver.disconnect();
        this.resizeObserver = null;
      }
    },
    getOptions: function getOptions(renderedIndex) {
      var count = (this.items || []).length;
      var index = this.isBoth() ? this.first.rows + renderedIndex : this.first + renderedIndex;
      return {
        index: index,
        count: count,
        first: index === 0,
        last: index === count - 1,
        even: index % 2 === 0,
        odd: index % 2 !== 0
      };
    },
    getLoaderOptions: function getLoaderOptions(index, extOptions) {
      var count = this.loaderArr.length;
      return _objectSpread({
        index: index,
        count: count,
        first: index === 0,
        last: index === count - 1,
        even: index % 2 === 0,
        odd: index % 2 !== 0
      }, extOptions);
    },
    getPageByFirst: function getPageByFirst(first) {
      return Math.floor(((first !== null && first !== void 0 ? first : this.first) + this.d_numToleratedItems * 4) / (this.step || 1));
    },
    isPageChanged: function isPageChanged(first) {
      return this.step && !this.lazy ? this.page !== this.getPageByFirst(first !== null && first !== void 0 ? first : this.first) : true;
    },
    setContentEl: function setContentEl(el) {
      this.content = el || this.content || findSingle(this.element, '[data-pc-section="content"]');
    },
    elementRef: function elementRef(el) {
      this.element = el;
    },
    contentRef: function contentRef(el) {
      this.content = el;
    }
  },
  computed: {
    containerClass: function containerClass() {
      return ['p-virtualscroller', this["class"], {
        'p-virtualscroller-inline': this.inline,
        'p-virtualscroller-both p-both-scroll': this.isBoth(),
        'p-virtualscroller-horizontal p-horizontal-scroll': this.isHorizontal()
      }];
    },
    contentClass: function contentClass() {
      return ['p-virtualscroller-content', {
        'p-virtualscroller-loading': this.d_loading
      }];
    },
    loaderClass: function loaderClass() {
      return ['p-virtualscroller-loader', {
        'p-virtualscroller-loader-mask': !this.$slots.loader
      }];
    },
    loadedItems: function loadedItems() {
      var _this12 = this;
      if (this.items && !this.d_loading) {
        if (this.isBoth()) return this.items.slice(this.appendOnly ? 0 : this.first.rows, this.last.rows).map(function (item) {
          return _this12.columns ? item : item.slice(_this12.appendOnly ? 0 : _this12.first.cols, _this12.last.cols);
        });else if (this.isHorizontal() && this.columns) return this.items;else return this.items.slice(this.appendOnly ? 0 : this.first, this.last);
      }
      return [];
    },
    loadedRows: function loadedRows() {
      return this.d_loading ? this.loaderDisabled ? this.loaderArr : [] : this.loadedItems;
    },
    loadedColumns: function loadedColumns() {
      if (this.columns) {
        var both = this.isBoth();
        var horizontal = this.isHorizontal();
        if (both || horizontal) {
          return this.d_loading && this.loaderDisabled ? both ? this.loaderArr[0] : this.loaderArr : this.columns.slice(both ? this.first.cols : this.first, both ? this.last.cols : this.last);
        }
      }
      return this.columns;
    }
  },
  components: {
    SpinnerIcon: SpinnerIcon
  }
};

var _hoisted_1 = ["tabindex"];
function render(_ctx, _cache, $props, $setup, $data, $options) {
  var _component_SpinnerIcon = resolveComponent("SpinnerIcon");
  return !_ctx.disabled ? (openBlock(), createElementBlock("div", mergeProps({
    key: 0,
    ref: $options.elementRef,
    "class": $options.containerClass,
    tabindex: _ctx.tabindex,
    style: _ctx.style,
    onScroll: _cache[0] || (_cache[0] = function () {
      return $options.onScroll && $options.onScroll.apply($options, arguments);
    })
  }, _ctx.ptmi('root')), [renderSlot(_ctx.$slots, "content", {
    styleClass: $options.contentClass,
    items: $options.loadedItems,
    getItemOptions: $options.getOptions,
    loading: $data.d_loading,
    getLoaderOptions: $options.getLoaderOptions,
    itemSize: _ctx.itemSize,
    rows: $options.loadedRows,
    columns: $options.loadedColumns,
    contentRef: $options.contentRef,
    spacerStyle: $data.spacerStyle,
    contentStyle: $data.contentStyle,
    vertical: $options.isVertical(),
    horizontal: $options.isHorizontal(),
    both: $options.isBoth()
  }, function () {
    return [createElementVNode("div", mergeProps({
      ref: $options.contentRef,
      "class": $options.contentClass,
      style: $data.contentStyle
    }, _ctx.ptm('content')), [(openBlock(true), createElementBlock(Fragment, null, renderList($options.loadedItems, function (item, index) {
      return renderSlot(_ctx.$slots, "item", {
        key: index,
        item: item,
        options: $options.getOptions(index)
      });
    }), 128))], 16)];
  }), _ctx.showSpacer ? (openBlock(), createElementBlock("div", mergeProps({
    key: 0,
    "class": "p-virtualscroller-spacer",
    style: $data.spacerStyle
  }, _ctx.ptm('spacer')), null, 16)) : createCommentVNode("", true), !_ctx.loaderDisabled && _ctx.showLoader && $data.d_loading ? (openBlock(), createElementBlock("div", mergeProps({
    key: 1,
    "class": $options.loaderClass
  }, _ctx.ptm('loader')), [_ctx.$slots && _ctx.$slots.loader ? (openBlock(true), createElementBlock(Fragment, {
    key: 0
  }, renderList($data.loaderArr, function (_, index) {
    return renderSlot(_ctx.$slots, "loader", {
      key: index,
      options: $options.getLoaderOptions(index, $options.isBoth() && {
        numCols: _ctx.d_numItemsInViewport.cols
      })
    });
  }), 128)) : createCommentVNode("", true), renderSlot(_ctx.$slots, "loadingicon", {}, function () {
    return [createVNode(_component_SpinnerIcon, mergeProps({
      spin: "",
      "class": "p-virtualscroller-loading-icon"
    }, _ctx.ptm('loadingIcon')), null, 16)];
  })], 16)) : createCommentVNode("", true)], 16, _hoisted_1)) : (openBlock(), createElementBlock(Fragment, {
    key: 1
  }, [renderSlot(_ctx.$slots, "default"), renderSlot(_ctx.$slots, "content", {
    items: _ctx.items,
    rows: _ctx.items,
    columns: $options.loadedColumns
  })], 64));
}

script.render = render;

export { script as default };
//# sourceMappingURL=index.mjs.map