Method getVisibleRange

src/react-list.js:469–481

()

  }

  getVisibleRange() {
    const { from, size } = this.state;
    const { start, end } = this.getStartAndEnd(0);
    const cache = {};
    let first, last;
    for (let i = from; i < from + size; ++i) {
      const itemStart = this.getSpaceBefore(i, cache);
      const itemEnd = itemStart + this.getSizeOfItem(i);
      if (first == null && itemEnd > start) first = i;
      if (first != null && itemStart < end) last = i;
    }
    return [first, last];
  }

  renderItems() {
    const { itemRenderer, itemsRenderer } = this.props;