Nette\Forms\Form::isSubmitted PHP Method

    public function isSubmitted()
    {
        if ($this->submittedBy === NULL) {
            $this->getHttpData();
        }
        return $this->submittedBy;
    }

 /**
  * @param IComponent
  * @return bool
  */
 protected function shouldSkip($component)
 {
     if ($component instanceof Controls\Button) {
         return TRUE;
     }
     if ($this->isValidating() && $this->form->isAnchored() && ($submittedBy = $this->form->isSubmitted()) && $submittedBy instanceof ISubmitterControl) {
         $controls = $submittedBy->getValidationScope();
         if ($controls === NULL) {
             return FALSE;
         }
         foreach ($controls as $control) {
             if ($control === $component) {
                 return FALSE;
             }
             if ($control instanceof Container && array_search($component, $control->getComponents(TRUE), TRUE)) {
                 return FALSE;
             }
         }
         return TRUE;
     }
     return FALSE;
 }