loadMore()

in docs-content/examples-source/material/tree/tree-loadmore/tree-loadmore-example.ts [65:83]

• 17 lines of code
• 6 McCabe index (conditional complexity)

  loadMore(item: string, onlyFirstTime = false) {
    if (!this.nodeMap.has(item) || !this.dataMap.has(item)) {
      return;
    }
    const parent = this.nodeMap.get(item)!;
    const children = this.dataMap.get(item)!;
    if (onlyFirstTime && parent.children!.length > 0) {
      return;
    }
    const newChildrenNumber = parent.children!.length + this.batchNumber;
    const nodes = children.slice(0, newChildrenNumber).map(name => this._generateNode(name));
    if (newChildrenNumber < children.length) {
      // Need a new load more node
      nodes.push(new LoadmoreNode(LOAD_MORE, false, item));
    }

    parent.childrenChange.next(nodes);
    this.dataChange.next(this.dataChange.value);
  }