array(
'label' => t('Image'),
'description' => t('This field stores the ID of an image file as an integer value.'),
'settings' => array(
'uri_scheme' => 'public',
'default_image' => 0,
),
'instance_settings' => array(
'file_extensions' => 'png gif jpg jpeg',
'file_directory' => '',
'max_filesize' => '',
'alt_field' => 0,
'title_field' => 0,
'max_resolution' => '',
'min_resolution' => '',
),
'default_widget' => 'image_image',
'default_formatter' => 'image',
),
);
}
/**
* Implements hook_field_schema().
*/
function image_field_schema($field) {
return array(
'columns' => array(
'fid' => array(
'description' => 'The {files}.fid being referenced in this field.',
'type' => 'int',
'not null' => FALSE,
'unsigned' => TRUE,
),
'alt' => array(
'description' => "Alternative image text, for the image's 'alt' attribute.",
'type' => 'varchar',
'length' => 128,
'not null' => FALSE,
),
'title' => array(
'description' => "Image title text, for the image's 'title' attribute.",
'type' => 'varchar',
'length' => 128,
'not null' => FALSE,
),
),
'indexes' => array(
'fid' => array('fid'),
),
);
}
/**
* Implements hook_field_settings_form().
*/
function image_field_settings_form($field, $instance) {
$defaults = field_info_field_settings($field['type']);
$settings = array_merge($defaults, $field['settings']);
$scheme_options = array();
foreach (file_get_stream_wrappers(STREAM_WRAPPERS_WRITE_VISIBLE) as $scheme => $stream_wrapper) {
$scheme_options[$scheme] = $stream_wrapper['name'];
}
$form['uri_scheme'] = array(
'#type' => 'radios',
'#title' => t('Upload destination'),
'#options' => $scheme_options,
'#default_value' => $settings['uri_scheme'],
'#description' => t('Select where the final files should be stored. Private file storage has significantly more overhead than public files, but allows restricted access to files within this field.'),
);
$form['default_image'] = array(
'#title' => t('Default image'),
'#type' => 'managed_file',
'#description' => t('If no image is uploaded, this image will be shown on display.'),
'#default_value' => $field['settings']['default_image'],
'#upload_location' => 'public://default_images/',
);
return $form;
}
/**
* Implements hook_field_instance_settings_form().
*/
function image_field_instance_settings_form($field, $instance) {
$settings = $instance['settings'];
// Use the file field instance settings form as a basis.
$form = file_field_instance_settings_form($field, $instance);
// Add maximum and minimum resolution settings.
$max_resolution = explode('x', $settings['max_resolution']) + array('', '');
$form['max_resolution'] = array(
'#title' => t('Maximum image resolution'),
'#element_validate' => array('_image_field_resolution_validate'),
'#theme_wrappers' => array('form_element'),
'#weight' => 4.1,
'#description' => t('The maximum allowed image size expressed as WIDTHxHEIGHT (e.g. 640x480). Leave blank for no restriction. If a larger image is uploaded, it will be resized to reflect the given width and height. Resizing images on upload will cause the loss of EXIF data in the image.'),
);
$form['max_resolution']['x'] = array(
'#type' => 'textfield',
'#default_value' => $max_resolution[0],
'#size' => 5,
'#maxlength' => 5,
'#field_suffix' => ' x ',
'#theme_wrappers' => array(),
);
$form['max_resolution']['y'] = array(
'#type' => 'textfield',
'#default_value' => $max_resolution[1],
'#size' => 5,
'#maxlength' => 5,
'#field_suffix' => ' ' . t('pixels'),
'#theme_wrappers' => array(),
);
$min_resolution = explode('x', $settings['min_resolution']) + array('', '');
$form['min_resolution'] = array(
'#title' => t('Minimum image resolution'),
'#element_validate' => array('_image_field_resolution_validate'),
'#theme_wrappers' => array('form_element'),
'#weight' => 4.2,
'#description' => t('The minimum allowed image size expressed as WIDTHxHEIGHT (e.g. 640x480). Leave blank for no restriction. If a smaller image is uploaded, it will be rejected.'),
);
$form['min_resolution']['x'] = array(
'#type' => 'textfield',
'#default_value' => $min_resolution[0],
'#size' => 5,
'#maxlength' => 5,
'#field_suffix' => ' x ',
'#theme_wrappers' => array(),
);
$form['min_resolution']['y'] = array(
'#type' => 'textfield',
'#default_value' => $min_resolution[1],
'#size' => 5,
'#maxlength' => 5,
'#field_suffix' => ' ' . t('pixels'),
'#theme_wrappers' => array(),
);
// Remove the description option.
unset($form['description_field']);
// Add title and alt configuration options.
$form['alt_field'] = array(
'#type' => 'checkbox',
'#title' => t('Enable Alt field'),
'#default_value' => $settings['alt_field'],
'#description' => t('The alt attribute may be used by search engines, screen readers, and when the image cannot be loaded.'),
'#weight' => 10,
);
$form['title_field'] = array(
'#type' => 'checkbox',
'#title' => t('Enable Title field'),
'#default_value' => $settings['title_field'],
'#description' => t('The title attribute is used as a tooltip when the mouse hovers over the image.'),
'#weight' => 11,
);
return $form;
}
/**
* Element validate function for resolution fields.
*/
function _image_field_resolution_validate($element, &$form_state) {
if (!empty($element['x']['#value']) || !empty($element['y']['#value'])) {
foreach (array('x', 'y') as $dimension) {
$value = $element[$dimension]['#value'];
if (!is_numeric($value)) {
form_error($element[$dimension], t('Height and width values must be numeric.'));
return;
}
if (intval($value) == 0) {
form_error($element[$dimension], t('Both a height and width value must be specified in the !name field.', array('!name' => $element['#title'])));
return;
}
}
form_set_value($element, intval($element['x']['#value']) . 'x' . intval($element['y']['#value']), $form_state);
}
else {
form_set_value($element, '', $form_state);
}
}
/**
* Implements hook_field_load().
*/
function image_field_load($entity_type, $entities, $field, $instances, $langcode, &$items, $age) {
file_field_load($entity_type, $entities, $field, $instances, $langcode, $items, $age);
}
/**
* Implements hook_field_prepare_view().
*/
function image_field_prepare_view($entity_type, $entities, $field, $instances, $langcode, &$items) {
// If there are no files specified at all, use the default.
foreach ($entities as $id => $entity) {
if (empty($items[$id]) && $field['settings']['default_image']) {
if ($file = file_load($field['settings']['default_image'])) {
$items[$id][0] = (array) $file + array(
'is_default' => TRUE,
'alt' => '',
'title' => '',
);
}
}
}
}
/**
* Implements hook_field_presave().
*/
function image_field_presave($entity_type, $entity, $field, $instance, $langcode, &$items) {
file_field_presave($entity_type, $entity, $field, $instance, $langcode, $items);
}
/**
* Implements hook_field_update().
*/
function image_field_update($entity_type, $entity, $field, $instance, $langcode, &$items) {
file_field_update($entity_type, $entity, $field, $instance, $langcode, $items);
}
/**
* Implements hook_field_delete().
*/
function image_field_delete($entity_type, $entity, $field, $instance, $langcode, &$items) {
file_field_delete($entity_type, $entity, $field, $instance, $langcode, $items);
}
/**
* Implements hook_field_delete_revision().
*/
function image_field_delete_revision($entity_type, $entity, $field, $instance, $langcode, &$items) {
file_field_delete_revision($entity_type, $entity, $field, $instance, $langcode, $items);
}
/**
* Implements hook_field_is_empty().
*/
function image_field_is_empty($item, $field) {
return file_field_is_empty($item, $field);
}
/**
* Implements hook_field_widget_info().
*/
function image_field_widget_info() {
return array(
'image_image' => array(
'label' => t('Image'),
'field types' => array('image'),
'settings' => array(
'progress_indicator' => 'throbber',
'preview_image_style' => 'thumbnail',
),
'behaviors' => array(
'multiple values' => FIELD_BEHAVIOR_CUSTOM,
'default value' => FIELD_BEHAVIOR_NONE,
),
),
);
}
/**
* Implements hook_field_widget_settings_form().
*/
function image_field_widget_settings_form($field, $instance) {
$widget = $instance['widget'];
$settings = $widget['settings'];
// Use the file widget settings form.
$form = file_field_widget_settings_form($field, $instance);
$form['preview_image_style'] = array(
'#title' => t('Preview image style'),
'#type' => 'select',
'#options' => array('' => '<' . t('no preview') . '>') + image_style_options(FALSE),
'#default_value' => $settings['preview_image_style'],
'#description' => t('The preview image will be shown while editing the content.'),
'#weight' => 15,
);
return $form;
}
/**
* Implements hook_field_widget_form().
*/
function image_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
// Add display_field setting to field because file_field_widget_form() assumes it is set.
$field['settings']['display_field'] = 0;
$elements = file_field_widget_form($form, $form_state, $field, $instance, $langcode, $items, $delta, $element);
$settings = $instance['settings'];
foreach (element_children($elements) as $delta) {
// Add upload resolution validation.
if ($settings['max_resolution'] || $settings['min_resolution']) {
$elements[$delta]['#upload_validators']['file_validate_image_resolution'] = array($settings['max_resolution'], $settings['min_resolution']);
}
// If not using custom extension validation, ensure this is an image.
$supported_extensions = array('png', 'gif', 'jpg', 'jpeg');
$extensions = isset($elements[$delta]['#upload_validators']['file_validate_extensions'][0]) ? $elements[$delta]['#upload_validators']['file_validate_extensions'][0] : implode(' ', $supported_extensions);
$extensions = array_intersect(explode(' ', $extensions), $supported_extensions);
$elements[$delta]['#upload_validators']['file_validate_extensions'][0] = implode(' ', $extensions);
// Add all extra functionality provided by the image widget.
$elements[$delta]['#process'][] = 'image_field_widget_process';
}
if ($field['cardinality'] == 1) {
// If there's only one field, return it as delta 0.
if (empty($elements[0]['#default_value']['fid'])) {
$elements[0]['#description'] = theme('file_upload_help', array('description' => $instance['description'], 'upload_validators' => $elements[0]['#upload_validators']));
}
}
else {
$elements['#file_upload_description'] = theme('file_upload_help', array('upload_validators' => $elements[0]['#upload_validators']));
}
return $elements;
}
/**
* An element #process callback for the image_image field type.
*
* Expands the image_image type to include the alt and title fields.
*/
function image_field_widget_process($element, &$form_state, $form) {
$item = $element['#value'];
$item['fid'] = $element['fid']['#value'];
$instance = $form_state['field'][$element['#field_name']][$element['#language']]['instance'];
$settings = $instance['settings'];
$widget_settings = $instance['widget']['settings'];
$element['#theme'] = 'image_widget';
$element['#attached']['css'][] = drupal_get_path('module', 'image') . '/image.css';
// Add the image preview.
if ($element['#file'] && $widget_settings['preview_image_style']) {
$element['preview'] = array(
'#type' => 'markup',
'#markup' => theme('image_style', array('style_name' => $widget_settings['preview_image_style'], 'path' => $element['#file']->uri, 'getsize' => FALSE)),
);
}
// Add the additional alt and title fields.
$element['alt'] = array(
'#title' => t('Alternate text'),
'#type' => 'textfield',
'#default_value' => isset($item['alt']) ? $item['alt'] : '',
'#description' => t('This text will be used by screen readers, search engines, or when the image cannot be loaded.'),
'#maxlength' => variable_get('image_alt_length', 80), // See http://www.gawds.org/show.php?contentid=28.
'#weight' => -2,
'#access' => (bool) $item['fid'] && $settings['alt_field'],
);
$element['title'] = array(
'#type' => 'textfield',
'#title' => t('Title'),
'#default_value' => isset($item['title']) ? $item['title'] : '',
'#description' => t('The title is used as a tool tip when the user hovers the mouse over the image.'),
'#maxlength' => variable_get('image_title_length', 500),
'#weight' => -1,
'#access' => (bool) $item['fid'] && $settings['title_field'],
);
return $element;
}
/**
* Theme the display of the image field widget.
*/
function theme_image_widget($variables) {
$element = $variables['element'];
$output = '';
$output .= '';
return $output;
}
/**
* Implements hook_field_formatter_info().
*/
function image_field_formatter_info() {
$formatters = array(
'image' => array(
'label' => t('Image'),
'field types' => array('image'),
),
'image_link_content' => array(
'label' => t('Image linked to content'),
'field types' => array('image'),
),
'image_link_file' => array(
'label' => t('Image linked to file'),
'field types' => array('image'),
),
);
foreach (image_styles() as $style) {
$formatters['image__' . $style['name']] = array(
'label' => t('Image "@style"', array('@style' => $style['name'])),
'field types' => array('image'),
);
$formatters['image_link_content__' . $style['name']] = array(
'label' => t('Image "@style" linked to content', array('@style' => $style['name'])),
'field types' => array('image'),
);
$formatters['image_link_file__' . $style['name']] = array(
'label' => t('Image "@style" linked to file', array('@style' => $style['name'])),
'field types' => array('image'),
);
}
return $formatters;
}
/**
* Implements hook_field_formatter_view().
*/
function image_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
$element = array();
// Check if the formatter involves a particular image style.
$matches = array();
if (preg_match('/__([a-z0-9_]+)/', $display['type'], $matches)) {
$image_style = $matches[1];
}
// Check if the formatter involves a link.
if (strpos($display['type'], 'image_link_content') === 0) {
$uri = entity_uri($entity_type, $entity);
}
elseif (strpos($display['type'], 'image_link_file') === 0) {
$link_file = TRUE;
}
foreach ($items as $delta => $item) {
if (isset($link_file)) {
$uri = array(
'path' => file_create_url($item['uri']),
'options' => array(),
);
}
$element[$delta] = array(
'#theme' => 'image_formatter',
'#item' => $item,
'#image_style' => isset($image_style) ? $image_style : '',
'#path' => isset($uri) ? $uri : '',
);
}
return $element;
}
/**
* Theme function for image field formatters.
*/
function theme_image_formatter($variables) {
$item = $variables['item'];
$image = array(
'path' => $item['uri'],
'alt' => $item['alt'],
'title' => $item['title'],
);
if ($variables['image_style']) {
$image['style_name'] = $variables['image_style'];
$output = theme('image_style', $image);
}
else {
$output = theme('image', $image);
}
if ($variables['path']) {
$path = $variables['path']['path'];
$options = $variables['path']['options'];
// When displaying an image inside a link, the html option must be TRUE.
$options['html'] = TRUE;
$output = l($output, $path, $options);
}
return $output;
}