ding_toggle_format.module

<?php
/**
 * @file
 * Ding - toggle short/long format
 */


/**
 * Implements hook_block_info().
 */
function ding_toggle_format_block_info() {
  return array(
    'toggle' => array(
      'info' => t('Ding format toggle'),
      'cache' => DRUPAL_CACHE_PER_PAGE,
    ),
  );
}

/**
 * Implements hook_block_view().
 */
function ding_toggle_format_block_view($delta = '') {

  drupal_add_js(drupal_get_path('module', 'ding_toggle_format') . '/js/ding_toggle_format.js');
  drupal_add_js(drupal_get_path('module', 'ding_toggle_format') . '/js/jquery.cookie.min.js');

  drupal_add_css(drupal_get_path('module', 'ding_toggle_format') . '/css/ding_toggle_format.css');

  return array(
    'subject' => t('Ding toggle format'),
    'content' => ding_toggle_format_render_link(),
  );
}

/**
 * Return rendered image link to toggle format, and label.
 */
function ding_toggle_format_render_link() {
  // get view_type from url
  $view_type = arg(1);
  // construct the image's path (.gif stored in a module subdir)
  $image_path = drupal_get_path('module', 'ding_toggle_format') . '/images/blank.gif';

  // make some text for the image's alt & title tags (SEO, accessibility)
  $image_alt = t('Toggle format');
  $image_title = t('Toggle format link');
  $format_link = '<span class="ding-toggle-format-label">' . t('Display format: ') . '</span>';

  // render image html using theme_image (returns NULL if file doesn't exist)
  if ($view_type != 'collection') {
    $format_image = theme('image', array(
      'path' => $image_path,
      'alt' => $image_alt,
      'title' => $image_title,
      'attributes' => array(
        'id' => 'ding-toggle-format-image',
      ),
    ));
    // if the image rendered ok, render link using above variables
    $image_link = l($format_image, '#', array(
      'html' => TRUE,
      'attributes' => array(
        'title' => $image_title,
        'id' => 'ding-toggle-format',
        'class' => 'ding-toggle-format-short',
      ),
    ));

    $format_link .= $image_link;
  }

  return $format_link;
}