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Viewing file:     defaultOverscanIndicesGetter.js (1.1 KB)      -rw-r--r--

export var SCROLL_DIRECTION_BACKWARD = -1;
export var SCROLL_DIRECTION_FORWARD = 1;
export var SCROLL_DIRECTION_HORIZONTAL = 'horizontal';
export var SCROLL_DIRECTION_VERTICAL = 'vertical';
/**
 * Calculates the number of cells to overscan before and after a specified range.
 * This function ensures that overscanning doesn't exceed the available cells.
 */

export default function defaultOverscanIndicesGetter(_ref) {
  var cellCount = _ref.cellCount,
      overscanCellsCount = _ref.overscanCellsCount,
      scrollDirection = _ref.scrollDirection,
      startIndex = _ref.startIndex,
      stopIndex = _ref.stopIndex;

  if (scrollDirection === SCROLL_DIRECTION_FORWARD) {
    return {
      overscanStartIndex: Math.max(0, startIndex),
      overscanStopIndex: Math.min(cellCount - 1, stopIndex + overscanCellsCount)
    };
  } else {
    return {
      overscanStartIndex: Math.max(0, startIndex - overscanCellsCount),
      overscanStopIndex: Math.min(cellCount - 1, stopIndex)
    };
  }
}
import { bpfrpt_proptype_OverscanIndicesGetterParams } from "./types";
import { bpfrpt_proptype_OverscanIndices } from "./types";