Method _initializeKeyManager

src/cdk/tree/tree.ts:459–480

()

  }

  private _initializeKeyManager() {
    const items = combineLatest([this._keyManagerNodes, this._nodes]).pipe(
      map(([keyManagerNodes, renderNodes]) =>
        keyManagerNodes.reduce<CdkTreeNode<T, K>[]>((items, data) => {
          const node = renderNodes.get(this._getExpansionKey(data));
          if (node) {
            items.push(node);
          }
          return items;
        }, []),
      ),
    );

    const keyManagerOptions: TreeKeyManagerOptions<CdkTreeNode<T, K>> = {
      trackBy: node => this._getExpansionKey(node.data),
      skipPredicate: node => !!node.isDisabled,
      typeAheadDebounceInterval: true,
      horizontalOrientation: this._dir.value,
    };

    this._keyManager = this._keyManagerFactory(items, keyManagerOptions);
  }

  private _initializeDataDiffer() {
    // Provide a default trackBy based on `_getExpansionKey` if one isn't provided.