$timestamp) {
if ($timestamp < $threshold) {
file_delete($file);
unset($previews[$file]);
}
}
variable_set('upload_preview_files', $previews);
}
/**
* Helper function for hook_form_alter().
*/
function _upload_preview_node_form(&$files) {
// Overwrite the theme function with the two-row theme which includes the
// preview image.
$files['#theme'] = 'upload_preview_form_current';
foreach (element_children($files) as $id) {
// Ensure that the preview image exists and add it to the form.
_upload_preview_create_thumbnail($files[$id]);
}
}
function _upload_preview_create_thumbnail(&$file) {
// Only check for images
if(strpos($file['filemime']['#value'], 'image/') === 0) {
// Create the preview image file path based on the actual filename or the
// preliminary filename (in the temp directory).
$path = file_create_path(variable_get('upload_preview_path', 'preview')) .'/';
$path .= md5($file['filepath']['#value']) .'.'. _upload_preview_mime_to_extension($file['filemime']['#value']);
// If the file does not exist, try to scale it down
if (!file_exists($path)) {
$size = explode('x', variable_get('upload_preview_size', '150x150'));
if (!image_scale($file['filepath']['#value'], $path, $size[0], $size[1])) {
// If the scaling failed, the preview is not added to the form.
$path = NULL;
}
else {
// The image creation succeeded. Now, add the image to the preview files
// array so that we can delete it later when it's not needed anymore.
$previews = variable_get('upload_preview_files', array());
$previews[$path] = time();
variable_set('upload_preview_files', $previews);
}
}
if ($path) {
// The image exists and the preview can be added.
$file['preview'] = array(
'#type' => 'upload_preview_image',
'#value' => file_create_url($path),
);
}
}
if (!isset($file['preview'])) {
// When there is no preview (image could not be created or the file is not
// an image), add an info text stating that fact.
$file['preview'] = array(
'#value' => '('. t('No preview') .')',
);
}
// Add the values for our custom theme function.
$file['remove']['#title'] = t('Delete');
$file['list']['#title'] = t('List');
$file['size']['#prefix'] = t('Size') .': ';
// Check if the file is already saved or still in the temp directory.
$dirty = !is_numeric($file['fid']['#value']);
$url = file_create_url($dirty ? file_create_filename($file['filename']['#value'], file_create_path()) : $file['filepath']['#value']);
// Modify the description field to be a textarea and change its description text.
$file['description']['#type'] = 'textarea';
$file['description']['#rows'] = 3;
$file['description']['#resizable'] = FALSE;
if ($dirty) {
$file['description']['#description'] = t('This file is not yet saved. The prospective URL will be @url.', array('@url' => $url));
}
else {
$file['description']['#description'] = t('This file can be found at @url.', array('@url' => $url));
}
}
/**
* Helper function. Returns the correct file ending for an image mime type.
*/
function _upload_preview_mime_to_extension($mime) {
switch ($mime) {
case 'image/jpeg':
case 'image/jpg':
return 'jpg';
break;
case 'image/gif':
return 'gif';
break;
case 'image/png':
default:
return 'png';
}
}
/**
* Helper function for hook_form_alter().
*/
function _upload_preview_admin_form(&$form) {
// Ensure that the buttons are at the very bottom.
$form['buttons']['#weight'] = 50;
$mode = variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC);
$path = file_directory_path();
$preview = file_create_path(variable_get('upload_preview_path', 'preview'));
$form['preview'] = array(
'#type' => 'fieldset',
'#title' => t('Previews'),
'#weight' => 5,
'#description' => t('Controls the behavior of previews in the file attachment section.'),
'#collapsible' => TRUE,
'#collapsed' => FALSE,
);
$form['preview']['upload_preview_path'] = array(
'#type' => 'textfield',
'#title' => t('Preview path'),
'#default_value' => substr($preview, strlen($path) + 1),
'#field_prefix' => $mode == FILE_DOWNLOADS_PUBLIC ? file_create_url('') : '<'. t('Private') .'>/',
'#description' => t('Subdirectory in the global file directory where previews will be stored.'),
);
$form['preview']['upload_preview_size'] = array(
'#type' => 'textfield',
'#title' => t('Image size'),
'#default_value' => variable_get('upload_preview_size', '150x150'),
'#size' => 15,
'#maxlength' => 10,
'#description' => t('The image size for the preview images (e.g. 150x150). The aspect ratio will be maintained while resizing.'),
'#field_suffix' => ''. t('WIDTHxHEIGHT') .''
);
$period = drupal_map_assoc(array(600, 1800, 3600, 7200, 14400, 28800, 86400, 172800, 604800), 'format_interval');
$period['1000000000'] = t('Never');
$form['preview']['upload_preview_lifetime'] = array(
'#type' => 'select',
'#title' => t('File lifetime'),
'#description' => t('The period until upload preview files are deleted. In case they get deleted before the user saved the post, they are regenerated automatically. Requires crontab.'),
'#default_value' => variable_get('upload_preview_lifetime', 86400),
'#options' => $period,
);
if (!isset($form['#validate'])) {
$form['#validate'] = array();
}
$form['#validate']['_upload_preview_admin_form_validate'] = array();
_upload_preview_prerequisites($preview);
}
/**
* Validate the preview image size.
*/
function _upload_preview_admin_form_validate($form_id, &$form_values) {
if (!preg_match('~^[1-9]\d*x[1-9]\d*$~', $form_values['upload_preview_size'])) {
form_set_error('upload_preview_size', t('The specified preview image size is invalid.'));
}
}
/**
* Ensure that the preview image directory exists. If it doesn't, try to create it.
*/
function _upload_preview_prerequisites(&$preview) {
if (!file_check_directory($preview, FILE_CREATE_DIRECTORY)) {
drupal_set_message(t('Attachment previews are disabled. The preview directory %directory has not been properly configured.', array('%directory' => $preview)), 'error');
form_set_error('upload_preview_path');
}
// Also ensure, that we have a image toolkit available.
if (!image_get_toolkit()) {
drupal_set_message(t('Make sure you have a working image toolkit installed and enabled. Further information can be found on the Image toolkit settings page.', array('@url' => url('admin/settings/image-toolkit'))), 'error');
}
}
/**
* Theme the attachments list.
*/
function theme_upload_preview_form_current(&$form) {
$header = array(t('Preview'), array('data' => t('Description'), 'colspan' => 3));
foreach (element_children($form) as $key) {
// Split up in two rows as the addition image would make the table too wide.
// The first row contains the image and the description...
$row = array();
$row[] = array('data' => drupal_render($form[$key]['preview']), 'rowspan' => 2);
$row[] = array('data' => drupal_render($form[$key]['description']), 'colspan' => 3);
$rows[] = $row;
// ... and the second row contains the list/remove checkboxes and the size information.
$row = array();
$row[] = drupal_render($form[$key]['remove']);
$row[] = drupal_render($form[$key]['list']);
$row[] = drupal_render($form[$key]['size']);
$rows[] = $row;
}
$output = theme('table', $header, $rows);
$output .= drupal_render($form);
return $output;
}
/**
* Theme a file upload preview image.
*/
function theme_upload_preview_image($element) {
return '
';
}
function _element_sort($a, $b) {
$a_weight = (is_array($a) && isset($a['#weight'])) ? $a['#weight'] : 0;
$b_weight = (is_array($b) && isset($b['#weight'])) ? $b['#weight'] : 0;
if ($a_weight == $b_weight) {
return 0;
}
return ($a_weight < $b_weight) ? -1 : 1;
}
function drupal_render(&$elements) {
if (!isset($elements) || (isset($elements['#access']) && !$elements['#access'])) {
return NULL;
}
$content = '';
// Either the elements did not go through form_builder or one of the children
// has a #weight.
if (!isset($elements['#sorted'])) {
uasort($elements, "_element_sort");
}
if (!isset($elements['#children'])) {
$children = element_children($elements);
/* Render all the children that use a theme function */
if (isset($elements['#theme']) && empty($elements['#theme_used'])) {
$elements['#theme_used'] = TRUE;
$previous = array();
foreach (array('#value', '#type', '#prefix', '#suffix') as $key) {
$previous[$key] = isset($elements[$key]) ? $elements[$key] : NULL;
}
// If we rendered a single element, then we will skip the renderer.
if (empty($children)) {
$elements['#printed'] = TRUE;
}
else {
$elements['#value'] = '';
}
$elements['#type'] = 'markup';
unset($elements['#prefix'], $elements['#suffix']);
$content = theme($elements['#theme'], $elements);
foreach (array('#value', '#type', '#prefix', '#suffix') as $key) {
$elements[$key] = isset($previous[$key]) ? $previous[$key] : NULL;
}
}
/* render each of the children using drupal_render and concatenate them */
if (!isset($content) || $content === '') {
foreach ($children as $key) {
$content .= drupal_render($elements[$key]);
}
}
}
if (isset($content) && $content !== '') {
$elements['#children'] = $content;
}
// Until now, we rendered the children, here we render the element itself
if (!isset($elements['#printed'])) {
$content = theme(!empty($elements['#type']) ? $elements['#type'] : 'markup', $elements);
$elements['#printed'] = TRUE;
}
if (isset($content) && $content !== '') {
$prefix = isset($elements['#prefix']) ? $elements['#prefix'] : '';
$suffix = isset($elements['#suffix']) ? $elements['#suffix'] : '';
return $prefix . $content . $suffix;
}
}