/**
* Expands a date element into an array of individual elements.
*
* Required settings:
* - #default_value: A DrupalDateTime object, adjusted to the proper local
* timezone. Converting a date stored in the database from UTC to the local
* zone and converting it back to UTC before storing it is not handled here.
* This element accepts a date as the default value, and then converts the
* user input strings back into a new date object on submission. No timezone
* adjustment is performed.
* Optional properties include:
* - #date_part_order: Array of date parts indicating the parts and order
* that should be used in the selector, optionally including 'ampm' for
* 12 hour time. Default is array('year', 'month', 'day', 'hour', 'minute').
* - #date_text_parts: Array of date parts that should be presented as
* text fields instead of drop-down selectors. Default is an empty array.
* - #date_date_callbacks: Array of optional callbacks for the date element.
* - #date_year_range: A description of the range of years to allow, like
* '1900:2050', '-3:+3' or '2000:+3', where the first value describes the
* earliest year and the second the latest year in the range. A year
* in either position means that specific year. A +/- value describes a
* dynamic value that is that many years earlier or later than the current
* year at the time the form is displayed. Defaults to '1900:2050'.
* - #date_increment: The increment to use for minutes and seconds, i.e.
* '15' would show only :00, :15, :30 and :45. Defaults to 1 to show every
* minute.
* - #date_timezone: The local timezone to use when creating dates. Generally
* this should be left empty and it will be set correctly for the user using
* the form. Useful if the default value is empty to designate a desired
* timezone for dates created in form processing. If a default date is
* provided, this value will be ignored, the timezone in the default date
* takes precedence. Defaults to the value returned by
* drupal_get_user_timezone().
*
* Example usage:
* @code
* $form = array(
* '#type' => 'datelist',
* '#default_value' => new DrupalDateTime('2000-01-01 00:00:00'),
* '#date_part_order' => array('month', 'day', 'year', 'hour', 'minute', 'ampm'),
* '#date_text_parts' => array('year'),
* '#date_year_range' => '2010:2020',
* '#date_increment' => 15,
* );
* @endcode
*
* @param array $element
* The form element whose value is being processed.
* @param \Drupal\Core\Form\FormStateInterface $form_state
* The current state of the form.
* @param array $complete_form
* The complete form structure.
*
* @return array
*/
public static function processDatelist(&$element, FormStateInterface $form_state, &$complete_form)
{
// Load translated date part labels from the appropriate calendar plugin.
$date_helper = new DateHelper();
// The value callback has populated the #value array.
$date = !empty($element['#value']['object']) ? $element['#value']['object'] : NULL;
// Set a fallback timezone.
if ($date instanceof DrupalDateTime) {
$element['#date_timezone'] = $date->getTimezone()->getName();
} elseif (!empty($element['#timezone'])) {
$element['#date_timezone'] = $element['#date_timezone'];
} else {
$element['#date_timezone'] = drupal_get_user_timezone();
}
$element['#tree'] = TRUE;
// Determine the order of the date elements.
$order = !empty($element['#date_part_order']) ? $element['#date_part_order'] : array('year', 'month', 'day');
$text_parts = !empty($element['#date_text_parts']) ? $element['#date_text_parts'] : array();
// Output multi-selector for date.
foreach ($order as $part) {
switch ($part) {
case 'day':
$options = $date_helper->days($element['#required']);
$format = 'j';
$title = t('Day');
break;
case 'month':
$options = $date_helper->monthNamesAbbr($element['#required']);
$format = 'n';
$title = t('Month');
break;
case 'year':
$range = static::datetimeRangeYears($element['#date_year_range'], $date);
$options = $date_helper->years($range[0], $range[1], $element['#required']);
$format = 'Y';
$title = t('Year');
break;
case 'hour':
$format = in_array('ampm', $element['#date_part_order']) ? 'g' : 'G';
$options = $date_helper->hours($format, $element['#required']);
$title = t('Hour');
break;
case 'minute':
$format = 'i';
$options = $date_helper->minutes($format, $element['#required'], $element['#date_increment']);
$title = t('Minute');
break;
case 'second':
$format = 's';
$options = $date_helper->seconds($format, $element['#required'], $element['#date_increment']);
$title = t('Second');
break;
case 'ampm':
$format = 'a';
$options = $date_helper->ampm($element['#required']);
$title = t('AM/PM');
break;
default:
$format = '';
$options = array();
$title = '';
}
$default = !empty($element['#value'][$part]) ? $element['#value'][$part] : '';
$value = $date instanceof DrupalDateTime && !$date->hasErrors() ? $date->format($format) : $default;
if (!empty($value) && $part != 'ampm') {
$value = intval($value);
}
$element['#attributes']['title'] = $title;
$element[$part] = array('#type' => in_array($part, $text_parts) ? 'textfield' : 'select', '#title' => $title, '#title_display' => 'invisible', '#value' => $value, '#attributes' => $element['#attributes'], '#options' => $options, '#required' => $element['#required'], '#error_no_message' => TRUE);
}
// Allows custom callbacks to alter the element.
if (!empty($element['#date_date_callbacks'])) {
foreach ($element['#date_date_callbacks'] as $callback) {
if (function_exists($callback)) {
$callback($element, $form_state, $date);
}
}
}
return $element;
}