Method expandAll

src/cdk/tree/tree.ts:713–719

Expands all data nodes in the tree.

()

  /** Expands all data nodes in the tree. */
  expandAll(): void {
    if (this.treeControl) {
      this.treeControl.expandAll();
    } else if (this._expansionModel) {
      this._forEachExpansionKey(keys => this._expansionModel?.select(...keys));
    }
  }

  /** Collapse all data nodes in the tree. */
  collapseAll(): void {