files_undo_remove.module in Files undo remove 7

Files undo remove.

File

files_undo_remove.module

<?php

/**
 * @file
 * Files undo remove.
 */

/**
 * Implements hook_init().
 */
function files_undo_remove_init() {

  // Add the Javascript and css. This will disable the 'Remove' buttons
  // and add nice CSS to the table rows. We need todo this here, because
  // it's possible a field collection on say an existing node doesn't have
  // any files yet so the 'remove' button would fail on editing as well.
  drupal_add_js(drupal_get_path('module', 'files_undo_remove') . '/files_undo_remove.js');
  drupal_add_css(drupal_get_path('module', 'files_undo_remove') . '/files_undo_remove.css');
}

/**
 * Implements hook_element_info_alter().
 */
function files_undo_remove_element_info_alter(&$type) {
  if (isset($type['managed_file'])) {
    $type['managed_file']['#process'][] = 'files_undo_remove_file_process';
  }
}

/**
 * Process callback on managed_file type.
 */
function files_undo_remove_file_process($element, &$form_state, $form) {

  // Do not process on field edit form.
  if ($form['#form_id'] == 'field_ui_field_edit_form') {
    return $element;
  }
  if (isset($element['fid']) && !empty($element['fid']['#value']) && !empty($element['#field_name'])) {
    $field_info = field_info_field($element['#field_name']);
    if ($field_info['cardinality'] == 1) {
      return $element;
    }

    // Change the remove button to one of ours.
    $element['remove_button'] = array(
      '#name' => $element['remove_button']['#name'],
      '#type' => 'submit',
      '#value' => t('Remove'),
      '#attributes' => array(
        'class' => array(
          'files-undo-remove',
        ),
      ),
      '#weight' => -5,
    );

    // Add a hidden state, defaults to 0.
    $values = drupal_array_get_nested_value($form_state['values'], $element['#parents']);
    $remove_state = isset($values['remove_state']) ? $values['remove_state'] : 0;
    $element['remove_state'] = array(
      '#type' => 'hidden',
      '#default_value' => $remove_state,
      '#attributes' => array(
        'class' => array(
          'files-undo-remove-hidden-state',
        ),
      ),
    );
  }
  return $element;
}

/**
 * Implements hook_entity_presave().
 */
function files_undo_remove_entity_presave($entity, $entity_type) {
  $clear_cache = FALSE;
  list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
  $instances = field_info_instances($entity_type, $bundle);
  foreach ($instances as $field_name => $field_instance) {

    // Make sure the field exists.
    if (!isset($entity->{$field_name})) {
      continue;
    }

    // Check if the modules are file, image or linkimage.
    if (in_array($field_instance['widget']['module'], array(
      'image',
      'file',
      'linkimagefield',
    ))) {
      foreach ($entity->{$field_name} as $language => $items) {
        foreach ($items as $delta => $item) {

          // Check if there's a remove_state key on the file values.
          if (isset($item['remove_state']) && $item['remove_state']) {
            $file = file_load($item['fid']);

            // @todo we'll probably have to do this different, like checking
            // usage, dropping it by one and removing if none is found anymore.
            // For now, we force the file to delete.
            file_delete($file, TRUE);

            // Remove the item from the entity.
            unset($entity->{$field_name}[$language][$delta]);
          }
        }
        $entity->{$field_name}[$language] = array_values($entity->{$field_name}[$language]);
      }
    }
  }
  if ($clear_cache) {

    // @todo check with entity cache module.
    cache_clear_all('field:' . $entity_type . ':' . $id, 'cache_field');
  }
}

Functions

Name	Description
files_undo_remove_element_info_alter	Implements hook_element_info_alter().
files_undo_remove_entity_presave	Implements hook_entity_presave().
files_undo_remove_file_process	Process callback on managed_file type.
files_undo_remove_init	Implements hook_init().