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Viewing file:     ScalingCellSizeAndPositionManager.js (6.62 KB)      -rw-r--r--

import _objectWithoutProperties from "@babel/runtime/helpers/objectWithoutProperties";
import _classCallCheck from "@babel/runtime/helpers/classCallCheck";
import _createClass from "@babel/runtime/helpers/createClass";
import _defineProperty from "@babel/runtime/helpers/defineProperty";
import CellSizeAndPositionManager from './CellSizeAndPositionManager';
import { getMaxElementSize } from './maxElementSize.js';

/**
 * Extends CellSizeAndPositionManager and adds scaling behavior for lists that are too large to fit within a browser's native limits.
 */
var ScalingCellSizeAndPositionManager =
/*#__PURE__*/
function () {
  function ScalingCellSizeAndPositionManager(_ref) {
    var _ref$maxScrollSize = _ref.maxScrollSize,
        maxScrollSize = _ref$maxScrollSize === void 0 ? getMaxElementSize() : _ref$maxScrollSize,
        params = _objectWithoutProperties(_ref, ["maxScrollSize"]);

    _classCallCheck(this, ScalingCellSizeAndPositionManager);

    _defineProperty(this, "_cellSizeAndPositionManager", void 0);

    _defineProperty(this, "_maxScrollSize", void 0);

    // Favor composition over inheritance to simplify IE10 support
    this._cellSizeAndPositionManager = new CellSizeAndPositionManager(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 scaled (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 === void 0 ? 'auto' : _ref3$align,
          containerSize = _ref3.containerSize,
          currentOffset = _ref3.currentOffset,
          targetIndex = _ref3.targetIndex;
      currentOffset = this._safeOffsetToOffset({
        containerSize: containerSize,
        offset: currentOffset
      });

      var offset = this._cellSizeAndPositionManager.getUpdatedOffsetForIndex({
        align: align,
        containerSize: containerSize,
        currentOffset: currentOffset,
        targetIndex: targetIndex
      });

      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;
}();

export { ScalingCellSizeAndPositionManager as default };
import { bpfrpt_proptype_Alignment } from "../types";
import { bpfrpt_proptype_CellSizeGetter } from "../types";
import { bpfrpt_proptype_VisibleCellRange } from "../types";