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Viewing file:     updateScrollIndexHelper.js (2.34 KB)      -rw-r--r--

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = updateScrollIndexHelper;

var _ScalingCellSizeAndPositionManager = _interopRequireDefault(require("./ScalingCellSizeAndPositionManager.js"));

var _types = require("../types");

function updateScrollIndexHelper(_ref) {
  var cellSize = _ref.cellSize,
      cellSizeAndPositionManager = _ref.cellSizeAndPositionManager,
      previousCellsCount = _ref.previousCellsCount,
      previousCellSize = _ref.previousCellSize,
      previousScrollToAlignment = _ref.previousScrollToAlignment,
      previousScrollToIndex = _ref.previousScrollToIndex,
      previousSize = _ref.previousSize,
      scrollOffset = _ref.scrollOffset,
      scrollToAlignment = _ref.scrollToAlignment,
      scrollToIndex = _ref.scrollToIndex,
      size = _ref.size,
      sizeJustIncreasedFromZero = _ref.sizeJustIncreasedFromZero,
      updateScrollIndexCallback = _ref.updateScrollIndexCallback;
  var cellCount = cellSizeAndPositionManager.getCellCount();
  var hasScrollToIndex = scrollToIndex >= 0 && scrollToIndex < cellCount;
  var sizeHasChanged = size !== previousSize || sizeJustIncreasedFromZero || !previousCellSize || typeof cellSize === 'number' && cellSize !== previousCellSize; // If we have a new scroll target OR if height/row-height has changed,
  // We should ensure that the scroll target is visible.

  if (hasScrollToIndex && (sizeHasChanged || scrollToAlignment !== previousScrollToAlignment || scrollToIndex !== previousScrollToIndex)) {
    updateScrollIndexCallback(scrollToIndex); // If we don't have a selected item but list size or number of children have decreased,
    // Make sure we aren't scrolled too far past the current content.
  } else if (!hasScrollToIndex && cellCount > 0 && (size < previousSize || cellCount < previousCellsCount)) {
    // We need to ensure that the current scroll offset is still within the collection's range.
    // To do this, we don't need to measure everything; CellMeasurer would perform poorly.
    // Just check to make sure we're still okay.
    // Only adjust the scroll position if we've scrolled below the last set of rows.
    if (scrollOffset > cellSizeAndPositionManager.getTotalSize() - size) {
      updateScrollIndexCallback(cellCount - 1);
    }
  }
}