Method addChild

src/material/tree/tree.spec.ts:713–736

(parent: TestData, isSpecial: boolean = false)

  }

  addChild(parent: TestData, isSpecial: boolean = false) {
    const nextIndex = ++this.dataIndex;
    const child = new TestData(`topping_${nextIndex}`, `cheese_${nextIndex}`, `base_${nextIndex}`);

    const index = this.data.indexOf(parent);
    if (index > -1) {
      parent = new TestData(
        parent.pizzaTopping,
        parent.pizzaCheese,
        parent.pizzaBase,
        parent.children,
        isSpecial,
      );
    }
    parent.children.push(child);
    parent.observableChildren.next(parent.children);

    let copiedData = this.data.slice();
    if (index > -1) {
      copiedData.splice(index, 1, parent);
    }
    this.data = copiedData;
    return child;
  }

  addData(isSpecial: boolean = false) {
    const nextIndex = ++this.dataIndex;