+<?php
+
+namespace Drupal\datetime\Plugin\Field\FieldType;
+
+use Drupal\Core\Datetime\DrupalDateTime;
+use Drupal\Core\Entity\FieldableEntityInterface;
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemList;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Represents a configurable entity datetime field.
+ */
+class DateTimeFieldItemList extends FieldItemList {
+
+ /**
+ * Defines the default value as now.
+ */
+ const DEFAULT_VALUE_NOW = 'now';
+
+ /**
+ * Defines the default value as relative.
+ */
+ const DEFAULT_VALUE_CUSTOM = 'relative';
+
+ /**
+ * {@inheritdoc}
+ */
+ public function defaultValuesForm(array &$form, FormStateInterface $form_state) {
+ if (empty($this->getFieldDefinition()->getDefaultValueCallback())) {
+ $default_value = $this->getFieldDefinition()->getDefaultValueLiteral();
+
+ $element = [
+ '#parents' => ['default_value_input'],
+ 'default_date_type' => [
+ '#type' => 'select',
+ '#title' => t('Default date'),
+ '#description' => t('Set a default value for this date.'),
+ '#default_value' => isset($default_value[0]['default_date_type']) ? $default_value[0]['default_date_type'] : '',
+ '#options' => [
+ static::DEFAULT_VALUE_NOW => t('Current date'),
+ static::DEFAULT_VALUE_CUSTOM => t('Relative date'),
+ ],
+ '#empty_value' => '',
+ ],
+ 'default_date' => [
+ '#type' => 'textfield',
+ '#title' => t('Relative default value'),
+ '#description' => t("Describe a time by reference to the current day, like '+90 days' (90 days from the day the field is created) or '+1 Saturday' (the next Saturday). See <a href=\"http://php.net/manual/function.strtotime.php\">strtotime</a> for more details."),
+ '#default_value' => (isset($default_value[0]['default_date_type']) && $default_value[0]['default_date_type'] == static::DEFAULT_VALUE_CUSTOM) ? $default_value[0]['default_date'] : '',
+ '#states' => [
+ 'visible' => [
+ ':input[id="edit-default-value-input-default-date-type"]' => ['value' => static::DEFAULT_VALUE_CUSTOM],
+ ]
+ ]
+ ]
+ ];
+
+ return $element;
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function defaultValuesFormValidate(array $element, array &$form, FormStateInterface $form_state) {
+ if ($form_state->getValue(['default_value_input', 'default_date_type']) == static::DEFAULT_VALUE_CUSTOM) {
+ $is_strtotime = @strtotime($form_state->getValue(['default_value_input', 'default_date']));
+ if (!$is_strtotime) {
+ $form_state->setErrorByName('default_value_input][default_date', t('The relative date value entered is invalid.'));
+ }
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function defaultValuesFormSubmit(array $element, array &$form, FormStateInterface $form_state) {
+ if ($form_state->getValue(['default_value_input', 'default_date_type'])) {
+ if ($form_state->getValue(['default_value_input', 'default_date_type']) == static::DEFAULT_VALUE_NOW) {
+ $form_state->setValueForElement($element['default_date'], static::DEFAULT_VALUE_NOW);
+ }
+ return [$form_state->getValue('default_value_input')];
+ }
+ return [];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function processDefaultValue($default_value, FieldableEntityInterface $entity, FieldDefinitionInterface $definition) {
+ $default_value = parent::processDefaultValue($default_value, $entity, $definition);
+
+ if (isset($default_value[0]['default_date_type'])) {
+ if ($definition->getSetting('datetime_type') === DateTimeItem::DATETIME_TYPE_DATE) {
+ // A default date only value should be in the format used for date
+ // storage but in the user's local timezone.
+ $date = new DrupalDateTime($default_value[0]['default_date'], drupal_get_user_timezone());
+ $format = DATETIME_DATE_STORAGE_FORMAT;
+ }
+ else {
+ // A default date+time value should be in the format and timezone used
+ // for date storage.
+ $date = new DrupalDateTime($default_value[0]['default_date'], DATETIME_STORAGE_TIMEZONE);
+ $format = DATETIME_DATETIME_STORAGE_FORMAT;
+ }
+ $value = $date->format($format);
+ // We only provide a default value for the first item, as do all fields.
+ // Otherwise, there is no way to clear out unwanted values on multiple value
+ // fields.
+ $default_value = [
+ [
+ 'value' => $value,
+ 'date' => $date,
+ ]
+ ];
+ }
+ return $default_value;
+ }
+
+}