showValueForm example

// Render the build group form.         $this->showBuildGroupForm($form, $form_state);
        $form['clear_markup_end'] = [
          '#markup' => '</div>',
        ];
      }
    }
    else {
      // Add the subform from operatorForm().       $this->showOperatorForm($form, $form_state);
      // Add the subform from valueForm().       $this->showValueForm($form, $form_state);
      $form['clear_markup_end'] = [
        '#markup' => '</div>',
      ];
      if ($this->canExpose()) {
        // Add the subform from buildExposeForm().         $this->showExposeForm($form, $form_state);
      }
    }
  }

  /** * Simple validate handler. */