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<?php
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/**
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* @file
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* Enhanced control over the CSS Classes of any Block.
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*
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* Block Class allows users to add classes to any block through the block's
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* configuration interface. This implementation is based on an alteration of
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* the Core block database table to leverage the Core Block API functions,
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* objects and structure.
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*/
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/**
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* Implements hook_permission().
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*/
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function block_class_permission() {
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return array(
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'administer block classes' => array(
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'title' => t('Administer block classes'),
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'description' => t('Set CSS classes for blocks.'),
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),
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);
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}
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/**
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* Implements theme_preprocess_block().
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*
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* Extend block's classes with any user defined classes.
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*/
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function block_class_preprocess_block(&$vars) {
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$block = $vars['block'];
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if (!empty($block->css_class)) {
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$classes_array = explode(' ', $block->css_class);
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foreach ($classes_array as $class) {
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$vars['classes_array'][] = drupal_clean_css_identifier($class, array());
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}
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}
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}
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/**
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* Implements hook_preprocess_HOOK().
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*
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* Extend panel block's classes with any user defined classes.
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*/
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function block_class_preprocess_panels_pane(&$vars) {
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if ($vars['pane']->type != 'block') {
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return;
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}
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// Infer the block's $module and $delta from the pane subtype.
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$block_parts = explode('-', $vars['pane']->subtype);
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// Load the block based on the block parts.
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$block = block_load($block_parts[0], $block_parts[1]);
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// Add a generic 'module type' pane class.
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$vars['classes_array'][] = drupal_html_class('pane-' . $block->module);
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// Add $css_class to the $classes_array.
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if (!empty($block->css_class)) {
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$classes_array = explode(' ', $block->css_class);
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foreach ($classes_array as $class) {
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$vars['classes_array'][] = drupal_clean_css_identifier($class, array());
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}
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}
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}
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/**
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* Implements hook_form_alter().
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*
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* Alter block edit form to add configuration field.
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*/
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function block_class_form_alter(&$form, &$form_state, $form_id) {
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if (user_access('administer block classes') && ($form_id == 'block_admin_configure' || $form_id == 'block_add_block_form')) {
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// Load statically cached block object used to display the form.
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$block = block_load($form['module']['#value'], $form['delta']['#value']);
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$form['settings']['css_class'] = array(
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'#type' => 'textfield',
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'#title' => t('CSS class(es)'),
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'#default_value' => isset($block->css_class) ? $block->css_class : '',
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'#description' => t('Customize the styling of this block by adding CSS classes. Separate multiple classes by spaces.'),
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'#maxlength' => 255,
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);
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$form['#submit'][] = 'block_class_form_submit';
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}
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}
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/**
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* Helper function: additional submit callback for block configuration pages.
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*
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* Save supplied CSS classes.
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*/
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function block_class_form_submit($form, &$form_state) {
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if ($form_state['values']['form_id'] == 'block_admin_configure' || $form_state['values']['form_id'] == 'block_add_block_form') {
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// Only save if value has changed.
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if (isset($form_state['values']['css_class']) && $form['settings']['css_class']['#default_value'] != $form_state['values']['css_class'] && user_access('administer blocks')) {
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db_update('block')
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->fields(array('css_class' => $form_state['values']['css_class']))
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->condition('module', $form_state['values']['module'])
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->condition('delta', $form_state['values']['delta'])
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->execute();
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// Flush all context module cache to use the updated css_class.
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if (module_exists('context')) {
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cache_clear_all('context', 'cache', TRUE);
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}
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}
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}
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}
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