Function enable

packages/forms/src/model/abstract_model.ts:1311–1324

* Enables the control. This means the control is included in validation checks and * the aggregate value of its parent. Its status recalculates based on its value and * its validators. * * By default, if the control has children, all children are enabled. * * @see {@link AbstractCo

(opts: {onlySelf?: boolean; emitEvent?: boolean} = {})

   * When false, no events are emitted.
   */
  enable(opts: {onlySelf?: boolean; emitEvent?: boolean} = {}): void {
    // If parent has been marked artificially dirty we don't want to re-calculate the
    // parent's dirtiness based on the children.
    const skipPristineCheck = this._parentMarkedDirty(opts.onlySelf);

    this.status = VALID;
    this._forEachChild((control: AbstractControl) => {
      control.enable({...opts, onlySelf: true});
    });
    this.updateValueAndValidity({onlySelf: true, emitEvent: opts.emitEvent});

    this._updateAncestors({...opts, skipPristineCheck}, this);
    this._onDisabledChange.forEach((changeFn) => changeFn(false));
  }

  private _updateAncestors(
    opts: {onlySelf?: boolean; emitEvent?: boolean; skipPristineCheck?: boolean},