media.fields.inc 24.2 KB
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<?php
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/**
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 * @file
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 * Provide the media selector widget and media field formatters to the Fields
 * API.
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 */

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/**
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 * Implements hook_field_widget_info().
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 */
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function media_field_widget_info() {
  return array(
    'media_generic' => array(
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      'label' => t('Media browser'),
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      'field types' => array('file', 'image'),
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      'settings' => array(
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        'allowed_types' => array(
          'image' => 'image',
        ),
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        'browser_plugins' => array(),
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        'allowed_schemes' => array(
          'public' => 'public',
        ),
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      ),
      'behaviors' => array(
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        'multiple values' => FIELD_BEHAVIOR_CUSTOM,
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        'default value' => FIELD_BEHAVIOR_NONE,
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      ),
    ),
  );
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}
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/**
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 * Implements hook_field_widget_settings_form().
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 */
function media_field_widget_settings_form($field, $instance) {
  $widget = $instance['widget'];
  $settings = $widget['settings'];

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  $plugins = media_get_browser_plugin_info();
  $options = array();
  foreach ($plugins as $key => $plugin) {
    $options[$key] = check_plain($plugin['title']);
  }

  $form['browser_plugins'] = array(
    '#type' => 'checkboxes',
    '#title' => t('Enabled browser plugins'),
    '#options' => $options,
    '#default_value' => $settings['browser_plugins'],
    '#description' => t('Media browser plugins which are allowed for this field. If no plugins are selected, they will all be available.'),
  );
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  $form['allowed_types'] = array(
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    '#type' => 'checkboxes',
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    '#title' => t('Allowed file types'),
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    '#options' => file_entity_type_get_names(),
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    '#default_value' => $settings['allowed_types'],
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    '#description' => t('File types which are allowed for this field. If no file types are selected, they will all be available.'),
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  );

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  $visible_steam_wrappers = file_get_stream_wrappers(STREAM_WRAPPERS_VISIBLE);
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  $options = array();
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  foreach ($visible_steam_wrappers as $scheme => $information) {
    $options[$scheme] = check_plain($information['name']);
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  }
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  $form['allowed_schemes'] = array(
    '#type' => 'checkboxes',
    '#title' => t('Allowed URI schemes'),
    '#options' => $options,
    '#default_value' => $settings['allowed_schemes'],
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    '#description' => t('URI schemes which are allowed for this field. If no schemes are selected, they will all be available.'),
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  );
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  return $form;
}

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/**
 * Implements hook_field_widget_form().
 */
function media_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
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  $defaults = array(
    'fid' => 0,
    'display' => !empty($field['settings']['display_default']),
    'description' => '',
  );

  // Load the items for form rebuilds from the field state as they might not be
  // in $form_state['values'] because of validation limitations. Also, they are
  // only passed in as $items when editing existing entities.
  $field_state = field_form_get_state($element['#field_parents'], $field['field_name'], $langcode, $form_state);
  if (isset($field_state['items'])) {
    $items = $field_state['items'];
  }

  $field_settings = $instance['settings'];
  $widget_settings = $instance['widget']['settings'];

  // Essentially we use the media type, extended with some enhancements.
  $element_info = element_info('media');
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  $multiselect = ($field['cardinality'] > 1 || $field['cardinality'] == FIELD_CARDINALITY_UNLIMITED);

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  $element += array(
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    '#type' => 'media',
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    '#value_callback' => 'media_field_widget_value',
    '#process' => array_merge($element_info['#process'], array('media_field_widget_process')),
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    '#media_options' => array(
      'global' => array(
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        'types' => array_filter($widget_settings['allowed_types']),
        'enabledPlugins' => array_filter($instance['widget']['settings']['browser_plugins']),
        'schemes' => array_filter($widget_settings['allowed_schemes']),
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        'file_directory' => isset($field_settings['file_directory']) ? $field_settings['file_directory'] : '',
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        'file_extensions' => isset($field_settings['file_extensions']) ? $field_settings['file_extensions'] : variable_get('file_entity_default_allowed_extensions', 'jpg jpeg gif png txt doc docx xls xlsx pdf ppt pptx pps ppsx odt ods odp mp3 mov mp4 m4a m4v mpeg avi ogg oga ogv weba webp webm'),
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        'max_filesize' => isset($field_settings['max_filesize']) ? $field_settings['max_filesize'] : 0,
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        'uri_scheme' => !empty($field['settings']['uri_scheme']) ? $field['settings']['uri_scheme'] : file_default_scheme(),
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        'multiselect' => $multiselect,
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      ),
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    ),
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    // Allows this field to return an array instead of a single value.
    '#extended' => TRUE,
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  );

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  // If translation is enabled for the entity, store its form/source langcodes
  // on the elements for further usage in media_element_process().
  if (module_invoke('entity_translation', 'enabled', $element['#entity_type'], $element['#entity'])) {
    $translation_handler = entity_translation_get_handler($element['#entity_type'], $element['#entity']);
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    $element['#media_parent_entity_form_langcode'] = $translation_handler->getActiveLanguage();
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    if ($source_langcode = $translation_handler->getSourceLanguage()) {
      $element['#media_parent_entity_source_langcode'] = $source_langcode;
    }
  }
  elseif (module_exists('translation') && $element['#entity_type'] == 'node' && translation_supported_type($element['#entity']->type)) {
    $element['#media_parent_entity_form_langcode'] = $element['#entity']->language;
    $element['#media_parent_entity_source_langcode'] = $element['#entity']->language;
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  } elseif ($element['#entity_type'] == 'field_collection_item' && !empty($form['#entity']) && property_exists($form['#entity'], 'language')) {
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    $element['#media_parent_entity_form_langcode'] = $form['#entity']->language;
  }

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  // Add image field specific validators.
  if ($field['type'] == 'image') {
    if ($field_settings['min_resolution'] || $field_settings['max_resolution']) {
      $element['#media_options']['global']['min_resolution'] = $field_settings['min_resolution'];
      $element['#media_options']['global']['max_resolution'] = $field_settings['max_resolution'];
    }
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  }

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  if ($field['cardinality'] == 1) {
    // Set the default value.
    $element['#default_value'] = !empty($items) ? $items[0] : $defaults;
    // If there's only one field, return it as delta 0.
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    if (empty($element['#default_value']['fid'])) {
      $element['#description'] = theme('media_upload_help', array('description' => $element['#description']));
    }
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    $elements = array($element);
  }
  else {
    // If there are multiple values, add an element for each existing one.
    foreach ($items as $item) {
      $elements[$delta] = $element;
      $elements[$delta]['#default_value'] = $item;
      $elements[$delta]['#weight'] = $delta;
      $delta++;
    }
    // And then add one more empty row for new uploads except when this is a
    // programmed form as it is not necessary.
    if (($field['cardinality'] == FIELD_CARDINALITY_UNLIMITED || $delta < $field['cardinality']) && empty($form_state['programmed'])) {
      $elements[$delta] = $element;
      $elements[$delta]['#default_value'] = $defaults;
      $elements[$delta]['#weight'] = $delta;
      $elements[$delta]['#required'] = ($element['#required'] && $delta == 0);
    }
    // The group of elements all-together need some extra functionality
    // after building up the full list (like draggable table rows).
    $elements['#file_upload_delta'] = $delta;
    $elements['#theme'] = 'media_widget_multiple';
    $elements['#theme_wrappers'] = array('fieldset');
    $elements['#process'] = array('media_field_widget_process_multiple');
    $elements['#title'] = $element['#title'];
    $elements['#description'] = $element['#description'];
    $elements['#field_name'] = $element['#field_name'];
    $elements['#language'] = $element['#language'];
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    $elements['#display_field'] = intval(!empty($field['settings']['display_field']));
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    // Add some properties that will eventually be added to the media upload
    // field. These are added here so that they may be referenced easily through
    // a hook_form_alter().
    $elements['#file_upload_title'] = t('Attach media');
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    $elements['#file_upload_description'] = theme('media_upload_help', array('description' => ''));
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  }

  return $elements;
}

/**
 * The #value_callback for the media field element.
 */
function media_field_widget_value($element, $input = FALSE, $form_state) {
  if ($input) {
    // Checkboxes lose their value when empty.
    // If the display field is present make sure its unchecked value is saved.
    $field = field_widget_field($element, $form_state);
    if (empty($input['display'])) {
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      $input['display'] = !empty($field['settings']['display_field']) ? 0 : 1;
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    }
  }

  // We depend on the media element to handle uploads.
  $return = media_file_value($element, $input, $form_state);

  // Ensure that all the required properties are returned even if empty.
  $return += array(
    'fid' => 0,
    'display' => 1,
    'description' => '',
  );

  return $return;
}

/**
 * An element #process callback for the media field type.
 *
 * Expands the media type to include the description and display fields.
 */
function media_field_widget_process($element, &$form_state, $form) {
  $item = $element['#value'];
  $item['fid'] = $element['fid']['#value'];

  $field = field_widget_field($element, $form_state);
  $instance = field_widget_instance($element, $form_state);
  $settings = $instance['widget']['settings'];

  $element['#theme'] = 'media_widget';

  // Add the display field if enabled.
  if (!empty($field['settings']['display_field']) && $item['fid']) {
    $element['display'] = array(
      '#type' => empty($item['fid']) ? 'hidden' : 'checkbox',
      '#title' => t('Include file in display'),
      '#value' => isset($item['display']) ? $item['display'] : $field['settings']['display_default'],
      '#attributes' => array('class' => array('file-display')),
    );
  }
  else {
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    $element['display'] = array(
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      '#type' => 'hidden',
      '#value' => '1',
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    );
  }

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  // Add the description field if enabled.
  if (!empty($instance['settings']['description_field']) && $item['fid']) {
    $element['description'] = array(
      '#type' => variable_get('file_description_type', 'textfield'),
      '#title' => t('Description'),
      '#value' => isset($item['description']) ? $item['description'] : '',
      '#maxlength' => variable_get('file_description_length', 128),
      '#description' => t('The description may be used as the label of the link to the file.'),
    );
  }

  // Adjust the Ajax settings so that on upload and remove of any individual
  // file, the entire group of file fields is updated together.
  if ($field['cardinality'] != 1) {
    $parents = array_slice($element['#array_parents'], 0, -1);
    $new_path = 'media/ajax/' . implode('/', $parents) . '/' . $form['form_build_id']['#value'];
    $field_element = drupal_array_get_nested_value($form, $parents);
    $new_wrapper = $field_element['#id'] . '-ajax-wrapper';
    foreach (element_children($element) as $key) {
      if (isset($element[$key]['#ajax'])) {
        $element[$key]['#ajax']['path'] = $new_path;
        $element[$key]['#ajax']['wrapper'] = $new_wrapper;
      }
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    }
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    unset($element['#prefix'], $element['#suffix']);
  }

  // Add another submit handler to the upload and remove buttons, to implement
  // functionality needed by the field widget. This submit handler, along with
  // the rebuild logic in media_field_widget_form() requires the entire field,
  // not just the individual item, to be valid.
  foreach (array('attach_button', 'remove_button') as $key) {
    $element[$key]['#submit'][] = 'media_field_widget_submit';
    $element[$key]['#limit_validation_errors'] = array(array_slice($element['#parents'], 0, -1));
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  }

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  return $element;
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}

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/**
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 * An element #process callback for a group of media fields.
 *
 * Adds the weight field to each row so it can be ordered and adds a new Ajax
 * wrapper around the entire group so it can be replaced all at once.
 */
function media_field_widget_process_multiple($element, &$form_state, $form) {
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    // In order to support multiple selection, we need to reconstruct the _POST
  // data that is checked in media_attach_file(). We need to reconstruct the
  // field's _POST key name, for example: field_mediafield_und_0.
  $upload_name_prefix = implode('_', $element['#parents']) . '_';
  $upload_name = $upload_name_prefix . $element['#file_upload_delta'];
  if (!empty($_POST['media'][$upload_name])) {
    $files = explode(',', $_POST['media'][$upload_name]);
    $count = count($files);
    // Supposing #file_upload_delta is always the last delta this will work
    for ($i = 0; $i < $count; $i++) {
      // For each file selected, increment the field key to be processed.
      // field_mediafield_und_0 becomes field_mediafield_und_1, etc.
      $_POST['media'][$upload_name_prefix . ($element['#file_upload_delta'] + $i)] = $files[$i];
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      // Copy the default file element to each newly selected file position.
      $default_element = $element[$element['#file_upload_delta']];
      $element[] = array_merge(
        $default_element,
        array('#weight' => ($element['#file_upload_delta'] + $i + 1))
      );
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    }
  }

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  $element_children = element_children($element, TRUE);
  $count = count($element_children);

  foreach ($element_children as $delta => $key) {
    if ($key != $element['#file_upload_delta']) {
      $description = _media_field_get_description_from_element($element[$key]);
      $element[$key]['_weight'] = array(
        '#type' => 'weight',
        '#title' => $description ? t('Weight for @title', array('@title' => $description)) : t('Weight for new file'),
        '#title_display' => 'invisible',
        '#delta' => $count,
        '#default_value' => $delta,
      );
    }
    else {
      // The title needs to be assigned to the attach field so that validation
      // errors include the correct widget label.
      $element[$key]['#title'] = $element['#title'];
      $element[$key]['_weight'] = array(
        '#type' => 'hidden',
        '#default_value' => $delta,
      );
    }
  }

  // Add a new wrapper around all the elements for Ajax replacement.
  $element['#prefix'] = '<div id="' . $element['#id'] . '-ajax-wrapper">';
  $element['#suffix'] = '</div>';

  return $element;
}

/**
 * Retrieves the file description from a media field element.
 *
 * This helper function is used by media_field_widget_process_multiple().
 *
 * @param $element
 *   The element being processed.
 *
 * @return
 *   A description of the file suitable for use in the administrative interface.
 */
function _media_field_get_description_from_element($element) {
  // Use the actual file description, if it's available.
  if (!empty($element['#default_value']['description'])) {
    return $element['#default_value']['description'];
  }
  // Otherwise, fall back to the filename.
  if (!empty($element['#default_value']['filename'])) {
    return $element['#default_value']['filename'];
  }
  // This is probably a newly uploaded file; no description is available.
  return FALSE;
}

/**
 * Form submission handler for attach/remove button of media_field_widget_form().
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 *
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 * This runs in addition to and after media_field_widget_submit().
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 *
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 * @see media_field_widget_submit()
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 * @see media_field_widget_form()
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 * @see media_field_widget_process()
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 */
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function media_field_widget_submit($form, &$form_state) {
  // During the form rebuild, media_field_widget_form() will create field item
  // widget elements using re-indexed deltas, so clear out $form_state['input']
  // to avoid a mismatch between old and new deltas. The rebuilt elements will
  // have #default_value set appropriately for the current state of the field,
  // so nothing is lost in doing this.
  $parents = array_slice($form_state['triggering_element']['#parents'], 0, -2);
  drupal_array_set_nested_value($form_state['input'], $parents, NULL);

  $button = $form_state['triggering_element'];

  // Go one level up in the form, to the widgets container.
  $element = drupal_array_get_nested_value($form, array_slice($button['#array_parents'], 0, -1));
  $field_name = $element['#field_name'];
  $langcode = $element['#language'];
  $parents = $element['#field_parents'];
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  $submitted_values = drupal_array_get_nested_value($form_state['values'], array_slice($button['#parents'], 0, -2));
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  foreach ($submitted_values as $delta => $submitted_value) {
    if (!$submitted_value['fid']) {
      unset($submitted_values[$delta]);
    }
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  }
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  ksort($submitted_values);
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  // Re-index deltas after removing empty items.
  $submitted_values = array_values($submitted_values);

  // Update form_state values.
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  drupal_array_set_nested_value($form_state['values'], array_slice($button['#parents'], 0, -2), $submitted_values);
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  // Update items.
  $field_state = field_form_get_state($parents, $field_name, $langcode, $form_state);
  $field_state['items'] = $submitted_values;
  field_form_set_state($parents, $field_name, $langcode, $form_state, $field_state);
}

/**
 * Returns HTML for an individual media widget.
 *
 * @param $variables
 *   An associative array containing:
 *   - element: A render element representing the widget.
 *
 * @ingroup themeable
 */
function theme_media_widget($variables) {
  $element = $variables['element'];
  $output = '';

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  // Merge provided attributes with existing ones.
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  // The "form-media" class is required for proper Ajax functionality.
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  $attributes = array(
    'class' => array("media-widget", "form-media", "clearfix"),
  );
  if (!empty($element['#attributes'])) {
    $attributes = array_merge_recursive($attributes, $element['#attributes']);
  }
  if (!empty($element['#id'])) {
    $attributes = array_merge_recursive($attributes, array('id' => $element['#id'] . '--widget'));
  }

  // Render attributes into div in one go.
  $output .= '<div ' . drupal_attributes($attributes) . '>';
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  $output .= drupal_render_children($element);
  $output .= '</div>';

  return $output;
}

/**
 * Returns HTML for a group of media widgets.
 *
 * @param $variables
 *   An associative array containing:
 *   - element: A render element representing the widgets.
 *
 * @ingroup themeable
 */
function theme_media_widget_multiple($variables) {
  $element = $variables['element'];

  // Special ID and classes for draggable tables.
  $weight_class = $element['#id'] . '-weight';
  $table_id = $element['#id'] . '-table';

  // Build up a table of applicable fields.
  $headers = array();
  $headers[] = t('File information');
  if ($element['#display_field']) {
    $headers[] = array(
      'data' => t('Display'),
      'class' => array('checkbox'),
    );
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  }
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  $headers[] = t('Weight');
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  $headers[] = t('Operations');
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  // Get our list of widgets in order (needed when the form comes back after
  // preview or failed validation).
  $widgets = array();
  foreach (element_children($element) as $key) {
    $widgets[] = &$element[$key];
  }
  usort($widgets, '_field_sort_items_value_helper');

  $rows = array();
  foreach ($widgets as $key => &$widget) {
    // Save the uploading row for last.
    if ($widget['#file'] == FALSE) {
      $widget['#title'] = $element['#file_upload_title'];
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      $widget['#description'] = $element['#file_upload_description'];
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      continue;
    }

    // Delay rendering of the buttons, so that they can be rendered later in the
    // "operations" column.
    $operations_elements = array();
    foreach (element_children($widget) as $sub_key) {
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      if (isset($widget[$sub_key]['#type']) && ($widget[$sub_key]['#type'] == 'submit' || $widget[$sub_key]['#type'] == 'link')) {
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        hide($widget[$sub_key]);
        $operations_elements[] = &$widget[$sub_key];
      }
    }

    // Delay rendering of the "Display" option and the weight selector, so that
    // each can be rendered later in its own column.
    if ($element['#display_field']) {
      hide($widget['display']);
    }
    hide($widget['_weight']);

    // Render everything else together in a column, without the normal wrappers.
    $widget['#theme_wrappers'] = array();
    $information = drupal_render($widget);

    // Render the previously hidden elements, using render() instead of
    // drupal_render(), to undo the earlier hide().
    $operations = '';
    foreach ($operations_elements as $operation_element) {
      $operations .= render($operation_element);
    }
    $display = '';
    if ($element['#display_field']) {
      unset($widget['display']['#title']);
      $display = array(
        'data' => render($widget['display']),
        'class' => array('checkbox'),
      );
    }
    $widget['_weight']['#attributes']['class'] = array($weight_class);
    $weight = render($widget['_weight']);

    // Arrange the row with all of the rendered columns.
    $row = array();
    $row[] = $information;
    if ($element['#display_field']) {
      $row[] = $display;
    }
    $row[] = $weight;
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    $row[] = $operations;
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    $rows[] = array(
      'data' => $row,
      'class' => isset($widget['#attributes']['class']) ? array_merge($widget['#attributes']['class'], array('draggable')) : array('draggable'),
    );
  }

  drupal_add_tabledrag($table_id, 'order', 'sibling', $weight_class);

  $output = '';
  $output = empty($rows) ? '' : theme('table', array('header' => $headers, 'rows' => $rows, 'attributes' => array('id' => $table_id)));
  $output .= drupal_render_children($element);
  return $output;
}

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/**
 * Returns HTML for help text.
 *
 * @param $variables
 *   An associative array containing:
 *   - description: The normal description for this field, specified by the
 *     user.
 *
 * @ingroup themeable
 */
function theme_media_upload_help($variables) {
  $description = $variables['description'];

  $descriptions = array();

  if (strlen($description)) {
    $descriptions[] = $description;
  }

  return implode('<br />', $descriptions);
}

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/**
 * Implements hook_field_formatter_info().
 *
 * Provides legacy support for the "Large filetype icon" file field formatter.
 * This was originally used when media entities contained file fields. The
 * current file entity architecture no longer needs this, but people may
 * have used this formatter for other file fields on their website.
 *
 * @todo Some day, remove this.
 */
function media_field_formatter_info() {
  $formatters = array(
    'media_large_icon' => array(
      'label' => t('Large filetype icon'),
      'field types' => array('file'),
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      'settings' => array(
        'image_style' => '',
      ),
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    ),
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  );
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  return $formatters;
}
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/**
 * Implements hook_field_formatter_settings_form().
 *
 * Legacy support for the "Large filetype icon" file field formatter.
 * @see media_field_formatter_info()
 */
function media_field_formatter_settings_form($field, $instance, $view_mode, $form, &$form_state) {
  $display = $instance['display'][$view_mode];
  $settings = $display['settings'];

  $image_styles = image_style_options(FALSE, PASS_THROUGH);
  $element['image_style'] = array(
    '#title' => t('Image style'),
    '#type' => 'select',
    '#default_value' => $settings['image_style'],
    '#empty_option' => t('None (original image)'),
    '#options' => $image_styles,
  );

  return $element;
}

/**
 * Implements hook_field_formatter_settings_summary().
 *
 * Legacy support for the "Large filetype icon" file field formatter.
 * @see media_field_formatter_info()
 */
function media_field_formatter_settings_summary($field, $instance, $view_mode) {
  $display = $instance['display'][$view_mode];
  $settings = $display['settings'];

  $summary = array();

  $image_styles = image_style_options(FALSE, PASS_THROUGH);
  // Unset possible 'No defined styles' option.
  unset($image_styles['']);
  // Styles could be lost because of enabled/disabled modules that defines
  // their styles in code.
  if (isset($image_styles[$settings['image_style']])) {
    $summary[] = t('Image style: @style', array('@style' => $image_styles[$settings['image_style']]));
  }
  else {
    $summary[] = t('Original image');
  }

  return implode('<br />', $summary);
}

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/**
 * Implements hook_field_formatter_view().
 *
 * Legacy support for the "Large filetype icon" file field formatter.
 * @see media_field_formatter_info()
 */
function media_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
  $element = array();

  if ($display['type'] == 'media_large_icon') {
    foreach ($items as $delta => $item) {
      $element[$delta] = array(
        '#theme' => 'media_formatter_large_icon',
        '#file' => (object) $item,
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        '#style_name' => $display['settings']['image_style'],
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      );
    }
  }

  return $element;
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}