text: 'use strict';
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.DEFAULT_MAX_SCROLL_SIZE = undefined;
  
  var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
  
  var _CellSizeAndPositionManager = require('./CellSizeAndPositionManager');
  
  var _CellSizeAndPositionManager2 = _interopRequireDefault(_CellSizeAndPositionManager);
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  function _objectWithoutProperties(obj, keys) { var target = {}; for (var i in obj) { if (keys.indexOf(i) >= 0) continue; if (!Object.prototype.hasOwnProperty.call(obj, i)) continue; target[i] = obj[i]; } return target; }
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  /**
   * Browsers have scroll offset limitations (eg Chrome stops scrolling at ~33.5M pixels where as Edge tops out at ~1.5M pixels).
   * After a certain position, the browser won't allow the user to scroll further (even via JavaScript scroll offset adjustments).
   * This util picks a lower ceiling for max size and artificially adjusts positions within to make it transparent for users.
   */
  var DEFAULT_MAX_SCROLL_SIZE = exports.DEFAULT_MAX_SCROLL_SIZE = 1500000;
  
  /**
   * Extends CellSizeAndPositionManager and adds scaling behavior for lists that are too large to fit within a browser's native limits.
   */
  
  var ScalingCellSizeAndPositionManager = function () {
    function ScalingCellSizeAndPositionManager(_ref) {
      var _ref$maxScrollSize = _ref.maxScrollSize,
          maxScrollSize = _ref$maxScrollSize === undefined ? DEFAULT_MAX_SCROLL_SIZE : _ref$maxScrollSize,
          params = _objectWithoutProperties(_ref, ['maxScrollSize']);
  
      _classCallCheck(this, ScalingCellSizeAndPositionManager);
  
      // Favor composition over inheritance to simplify IE10 support
      this._cellSizeAndPositionManager = new _CellSizeAndPositionManager2.default(params);
      this._maxScrollSize = maxScrollSize;
    }
  
    _createClass(ScalingCellSizeAndPositionManager, [{
      key: 'areOffsetsAdjusted',
      value: function areOffsetsAdjusted() {
        return this._cellSizeAndPositionManager.getTotalSize() > this._maxScrollSize;
      }
    }, {
      key: 'configure',
      value: function configure(params) {
        this._cellSizeAndPositionManager.configure(params);
      }
    }, {
      key: 'getCellCount',
      value: function getCellCount() {
        return this._cellSizeAndPositionManager.getCellCount();
      }
    }, {
      key: 'getEstimatedCellSize',
      value: function getEstimatedCellSize() {
        return this._cellSizeAndPositionManager.getEstimatedCellSize();
      }
    }, {
      key: 'getLastMeasuredIndex',
      value: function getLastMeasuredIndex() {
        return this._cellSizeAndPositionManager.getLastMeasuredIndex();
      }
  
      /**
       * Number of pixels a cell at the given position (offset) should be shifted in order to fit within the scaled container.
       * The offset passed to this function is scalled (safe) as well.
       */
  
    }, {
      key: 'getOffsetAdjustment',
      value: function getOffsetAdjustment(_ref2) {
        var containerSize = _ref2.containerSize,
            offset = _ref2.offset;
  
        var totalSize = this._cellSizeAndPositionManager.getTotalSize();
        var safeTotalSize = this.getTotalSize();
        var offsetPercentage = this._getOffsetPercentage({
          containerSize: containerSize,
          offset: offset,
          totalSize: safeTotalSize
        });
  
        return Math.round(offsetPercentage * (safeTotalSize - totalSize));
      }
    }, {
      key: 'getSizeAndPositionOfCell',
      value: function getSizeAndPositionOfCell(index) {
        return this._cellSizeAndPositionManager.getSizeAndPositionOfCell(index);
      }
    }, {
      key: 'getSizeAndPositionOfLastMeasuredCell',
      value: function getSizeAndPositionOfLastMeasuredCell() {
        return this._cellSizeAndPositionManager.getSizeAndPositionOfLastMeasuredCell();
      }
  
      /** See CellSizeAndPositionManager#getTotalSize */
  
    }, {
      key: 'getTotalSize',
      value: function getTotalSize() {
        return Math.min(this._maxScrollSize, this._cellSizeAndPositionManager.getTotalSize());
      }
  
      /** See CellSizeAndPositionManager#getUpdatedOffsetForIndex */
  
    }, {
      key: 'getUpdatedOffsetForIndex',
      value: function getUpdatedOffsetForIndex(_ref3) {
        var _ref3$align = _ref3.align,
            align = _ref3$align === undefined ? 'auto' : _ref3$align,
            containerSize = _ref3.containerSize,
            currentOffset = _ref3.currentOffset,
            targetIndex = _ref3.targetIndex,
            totalSize = _ref3.totalSize;
  
        currentOffset = this._safeOffsetToOffset({
          containerSize: containerSize,
          offset: currentOffset
        });
  
        var offset = this._cellSizeAndPositionManager.getUpdatedOffsetForIndex({
          align: align,
          containerSize: containerSize,
          currentOffset: currentOffset,
          targetIndex: targetIndex,
          totalSize: totalSize
        });
  
        return this._offsetToSafeOffset({
          containerSize: containerSize,
          offset: offset
        });
      }
  
      /** See CellSizeAndPositionManager#getVisibleCellRange */
  
    }, {
      key: 'getVisibleCellRange',
      value: function getVisibleCellRange(_ref4) {
        var containerSize = _ref4.containerSize,
            offset = _ref4.offset;
  
        offset = this._safeOffsetToOffset({
          containerSize: containerSize,
          offset: offset
        });
  
        return this._cellSizeAndPositionManager.getVisibleCellRange({
          containerSize: containerSize,
          offset: offset
        });
      }
    }, {
      key: 'resetCell',
      value: function resetCell(index) {
        this._cellSizeAndPositionManager.resetCell(index);
      }
    }, {
      key: '_getOffsetPercentage',
      value: function _getOffsetPercentage(_ref5) {
        var containerSize = _ref5.containerSize,
            offset = _ref5.offset,
            totalSize = _ref5.totalSize;
  
        return totalSize <= containerSize ? 0 : offset / (totalSize - containerSize);
      }
    }, {
      key: '_offsetToSafeOffset',
      value: function _offsetToSafeOffset(_ref6) {
        var containerSize = _ref6.containerSize,
            offset = _ref6.offset;
  
        var totalSize = this._cellSizeAndPositionManager.getTotalSize();
        var safeTotalSize = this.getTotalSize();
  
        if (totalSize === safeTotalSize) {
          return offset;
        } else {
          var offsetPercentage = this._getOffsetPercentage({
            containerSize: containerSize,
            offset: offset,
            totalSize: totalSize
          });
  
          return Math.round(offsetPercentage * (safeTotalSize - containerSize));
        }
      }
    }, {
      key: '_safeOffsetToOffset',
      value: function _safeOffsetToOffset(_ref7) {
        var containerSize = _ref7.containerSize,
            offset = _ref7.offset;
  
        var totalSize = this._cellSizeAndPositionManager.getTotalSize();
        var safeTotalSize = this.getTotalSize();
  
        if (totalSize === safeTotalSize) {
          return offset;
        } else {
          var offsetPercentage = this._getOffsetPercentage({
            containerSize: containerSize,
            offset: offset,
            totalSize: safeTotalSize
          });
  
          return Math.round(offsetPercentage * (totalSize - containerSize));
        }
      }
    }]);
  
    return ScalingCellSizeAndPositionManager;
  }();
  
  exports.default = ScalingCellSizeAndPositionManager;