Method collapse

src/cdk/tree/tree.ts:1453–1457

Collapses this data node. Implemented for TreeKeyManagerItem.

()

  /** Collapses this data node. Implemented for TreeKeyManagerItem. */
  collapse(): void {
    if (this.isExpandable) {
      this._tree.collapse(this._data);
    }
  }

  /** Expands this data node. Implemented for TreeKeyManagerItem. */
  expand(): void {