<?php
// $Id: block_class.module,v 1.8 2011-01-09 21:46:24 toddnienkerk Exp $

/*
 * Extend block's classes with any user defined classes.
 */
function block_class_preprocess_block(&$vars) {
  $block = $vars['block'];
  $classes = block_class($block);
  $vars['classes_array'] = array_merge($vars['classes_array'], explode(' ', $classes));
}

/**
 * Return classes as string
 */
function block_class($block) {
  $ret = db_query('SELECT css_class FROM {block_class} WHERE module = :module AND delta = :delta', array(':module' => $block->module, ':delta' => $block->delta))->fetchField();
  return $ret ? $ret : '';
}


/**
 * Alter block edit form
 */
function block_class_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'block_admin_configure' || $form_id == 'block_add_block_form') {
    $block->module = $form['module']['#value'];
    $block->delta = $form['delta']['#value'];
    $css_class = block_class($block);
    
    $form['block_class'] = array(
      '#type' => 'fieldset',
      '#title' => t('Block Class settings'),
      '#collapsible' => TRUE,
      '#weight' => -1,
    );
    $form['block_class']['css_class'] = array(
      '#type' => 'textfield',
      '#title' => t('CSS class(es)'),
      '#default_value' => $css_class,
      '#description' => t('Separate classes with a space.'),
    );

    $form['#submit'][] = 'block_class_form_submit';
  }
}


/**
 * Save supplied class.
 */
function block_class_form_submit($form, &$form_state) {
  if ($form_state['values']['form_id'] == 'block_admin_configure' || $form_state['values']['form_id'] == 'block_add_block_form') {
    if (isset($form_state['values']['css_class']) && user_access('administer blocks')) {
      $module = $form_state['values']['module'];
      $delta = $form_state['values']['delta'];
      $class = $form_state['values']['css_class'];
      db_delete('block_class')->condition('module', $module)->condition('delta', $delta)->execute();
      if (!empty($class)) {
        $id = db_insert('block_class')->fields(array('module' => $module, 'delta' => $delta, 'css_class' => $class))->execute();
      }
    }
  }
}