getOverrideValues example

/** * Basic submit handler applicable to all 'standard' forms. * * This submit handler determines whether the user wants the submitted changes * to apply to the default display or to the current display, and dispatches * control appropriately. */
  public function standardSubmit($form, FormStateInterface $form_state) {
    // Determine whether the values the user entered are intended to apply to     // the current display or the default display.
    [$was_defaulted, $is_defaulted, $revert] = $this->getOverrideValues($form, $form_state);

    // Based on the user's choice in the display dropdown, determine which display     // these changes apply to.     $display_id = $form_state->get('display_id');
    if ($revert) {
      // If it's revert just change the override and return.       $display = &$this->getExecutable()->displayHandlers->get($display_id);
      $display->optionsOverride($form, $form_state);

      // Don't execute the normal submit handling but still store the changed view into cache.       $this->cacheSet();
      

  /** * Submit handler for removing an item from a view. */
  public function remove(&$form, FormStateInterface $form_state) {
    $view = $form_state->get('view');
    $display_id = $form_state->get('display_id');
    $type = $form_state->get('type');
    $id = $form_state->get('id');
    // Store the item back on the view     [$was_defaulted, $is_defaulted] = $view->getOverrideValues($form, $form_state);
    $executable = $view->getExecutable();
    // If the display selection was changed toggle the override value.     if ($was_defaulted != $is_defaulted) {
      $display = &$executable->displayHandlers->get($display_id);
      $display->optionsOverride($form, $form_state);
    }
    $executable->removeHandler($display_id, $type, $id);

    // Write to cache     $view->cacheSet();
  }

}