toggleNode()

in docs-content/examples-source/material/tree/tree-dynamic/tree-dynamic-example.ts [99:129]

• 26 lines of code
• 5 McCabe index (conditional complexity)

  toggleNode(node: DynamicFlatNode, expand: boolean) {
    const children = this._database.getChildren(node.item);
    const index = this.data.indexOf(node);
    if (!children || index < 0) {
      // If no children, or cannot find the node, no op
      return;
    }

    node.isLoading = true;

    setTimeout(() => {
      if (expand) {
        const nodes = children.map(
          name => new DynamicFlatNode(name, node.level + 1, this._database.isExpandable(name)),
        );
        this.data.splice(index + 1, 0, ...nodes);
      } else {
        let count = 0;
        for (
          let i = index + 1;
          i < this.data.length && this.data[i].level > node.level;
          i++, count++
        ) {}
        this.data.splice(index + 1, count);
      }

      // notify the change
      this.dataChange.next(this.data);
      node.isLoading = false;
    }, 1000);
  }