Method _setSelected

src/material/list/list-option.ts:270–286

* Sets the selected state of the option. * @returns Whether the value has changed.

(selected: boolean)

   * @returns Whether the value has changed.
   */
  _setSelected(selected: boolean): boolean {
    if (selected === this._selected) {
      return false;
    }

    this._selected = selected;

    if (selected) {
      this._selectionList.selectedOptions.select(this);
    } else {
      this._selectionList.selectedOptions.deselect(this);
    }

    this.selectedChange.emit(selected);
    this._changeDetectorRef.markForCheck();
    return true;
  }

  /**
   * Notifies Angular that the option needs to be checked in the next change detection run.