Method updateVariableFrame

src/react-list.js:342–375

(cb)

  }

  updateVariableFrame(cb) {
    if (!this.props.itemSizeGetter) this.cacheSizes();

    const { start, end } = this.getStartAndEnd();
    const { length, pageSize } = this.props;
    let space = 0;
    let from = 0;
    let size = 0;
    const maxFrom = length - 1;

    while (from < maxFrom) {
      const itemSize = this.getSizeOfItem(from);
      if (itemSize == null || space + itemSize > start) break;
      space += itemSize;
      ++from;
    }

    const maxSize = length - from;

    while (size < maxSize && space < end) {
      const itemSize = this.getSizeOfItem(from + size);
      if (itemSize == null) {
        size = Math.min(size + pageSize, maxSize);
        break;
      }
      space += itemSize;
      ++size;
    }

    this.maybeSetState(
      constrain(this.props, { from, itemsPerRow: 1, size }),
      cb
    );
  }

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