Function collapseDescendants

src/cdk/tree/control/base-tree-control.ts:91–95

Collapses a subtree rooted at given data node recursively.

(dataNode: T)

  /** Collapses a subtree rooted at given data node recursively. */
  collapseDescendants(dataNode: T): void {
    let toBeProcessed = [dataNode];
    toBeProcessed.push(...this.getDescendants(dataNode));
    this.expansionModel.deselect(...toBeProcessed.map(value => this._trackByValue(value)));
  }

  protected _trackByValue(value: T | K): K {
    return this.trackBy ? this.trackBy(value as T) : (value as K);