Method updateUniformFrame

src/react-list.js:377–391

(cb)

  }

  updateUniformFrame(cb) {
    const { itemSize, itemsPerRow } = this.getItemSizeAndItemsPerRow();

    if (!itemSize || !itemsPerRow) return cb();

    const { start, end } = this.getStartAndEnd();

    const { from, size } = constrain(this.props, {
      from: Math.floor(start / itemSize) * itemsPerRow,
      size: (Math.ceil((end - start) / itemSize) + 1) * itemsPerRow,
      itemsPerRow
    });

    return this.maybeSetState({ itemsPerRow, from, itemSize, size }, cb);
  }

  getSpaceBefore(index, cache = {}) {
    if (cache[index] != null) return cache[index];