Function disable

packages/forms/src/model/abstract_model.ts:1266–1291

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

   */
  disable(opts: {onlySelf?: boolean; emitEvent?: boolean; sourceControl?: AbstractControl}): void;
  disable(
    opts: {onlySelf?: boolean; emitEvent?: boolean; sourceControl?: AbstractControl} = {},
  ): 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 = DISABLED;
    (this as Writable<this>).errors = null;
    this._forEachChild((control: AbstractControl) => {
      /** We don't propagate the source control downwards */
      control.disable({...opts, onlySelf: true});
    });
    this._updateValue();

    const sourceControl = opts.sourceControl ?? this;
    if (opts.emitEvent !== false) {
      this._events.next(new ValueChangeEvent(this.value, sourceControl));
      this._events.next(new StatusChangeEvent(this.status, sourceControl));
      (this.valueChanges as EventEmitter<TValue>).emit(this.value);
      (this.statusChanges as EventEmitter<FormControlStatus>).emit(this.status);
    }

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

  /**
   * Enables the control. This means the control is included in validation checks and