/**
* {@inheritdoc}
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$choiceList = $this->createChoiceList($options);
$builder->setAttribute('choice_list', $choiceList);
if ($options['expanded']) {
$builder->setDataMapper($options['multiple'] ? new CheckboxListMapper() : new RadioListMapper());
// Initialize all choices before doing the index check below.
// This helps in cases where index checks are optimized for non
// initialized choice lists. For example, when using an SQL driver,
// the index check would read in one SQL query and the initialization
// requires another SQL query. When the initialization is done first,
// one SQL query is sufficient.
$choiceListView = $this->createChoiceListView($choiceList, $options);
$builder->setAttribute('choice_list_view', $choiceListView);
// Check if the choices already contain the empty value
// Only add the placeholder option if this is not the case
if (null !== $options['placeholder'] && 0 === count($choiceList->getChoicesForValues(array('')))) {
$placeholderView = new ChoiceView(null, '', $options['placeholder']);
// "placeholder" is a reserved name
$this->addSubForm($builder, 'placeholder', $placeholderView, $options);
}
$this->addSubForms($builder, $choiceListView->preferredChoices, $options);
$this->addSubForms($builder, $choiceListView->choices, $options);
// Make sure that scalar, submitted values are converted to arrays
// which can be submitted to the checkboxes/radio buttons
$builder->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $event) {
$form = $event->getForm();
$data = $event->getData();
if (null === $data) {
$emptyData = $form->getConfig()->getEmptyData();
if (false === FormUtil::isEmpty($emptyData) && array() !== $emptyData) {
$data = is_callable($emptyData) ? call_user_func($emptyData, $form, $data) : $emptyData;
}
}
// Convert the submitted data to a string, if scalar, before
// casting it to an array
if (!is_array($data)) {
$data = (array) (string) $data;
}
// A map from submitted values to integers
$valueMap = array_flip($data);
// Make a copy of the value map to determine whether any unknown
// values were submitted
$unknownValues = $valueMap;
// Reconstruct the data as mapping from child names to values
$data = array();
foreach ($form as $child) {
$value = $child->getConfig()->getOption('value');
// Add the value to $data with the child's name as key
if (isset($valueMap[$value])) {
$data[$child->getName()] = $value;
unset($unknownValues[$value]);
continue;
}
}
// The empty value is always known, independent of whether a
// field exists for it or not
unset($unknownValues['']);
// Throw exception if unknown values were submitted
if (count($unknownValues) > 0) {
throw new TransformationFailedException(sprintf('The choices "%s" do not exist in the choice list.', implode('", "', array_keys($unknownValues))));
}
$event->setData($data);
});
}
if ($options['multiple']) {
// <select> tag with "multiple" option or list of checkbox inputs
$builder->addViewTransformer(new ChoicesToValuesTransformer($choiceList));
} else {
// <select> tag without "multiple" option or list of radio inputs
$builder->addViewTransformer(new ChoiceToValueTransformer($choiceList));
}
if ($options['multiple'] && $options['by_reference']) {
// Make sure the collection created during the client->norm
// transformation is merged back into the original collection
$builder->addEventSubscriber(new MergeCollectionListener(true, true));
}
}
public function isEmpty()
{
foreach ($this->children as $child) {
if (!$child->isEmpty()) {
return false;
}
}
return FormUtil::isEmpty($this->modelData) || 0 === count($this->modelData) || $this->modelData instanceof \Traversable && 0 === iterator_count($this->modelData);
}
/**
* {@inheritdoc}
*/
public function isEmpty()
{
foreach ($this->children as $child) {
if (!$child->isEmpty()) {
return false;
}
}
return FormUtil::isEmpty($this->modelData) || array() === $this->modelData;
}
