handlers/views_handler_field_prerender_list.inc

<?php

class views_handler_field_prerender_list extends views_handler_field {
  var $items = array();

  function option_definition() {
    $options = parent::option_definition();

    $options['type'] = array('default' => 'separator');
    $options['separator'] = array('default' => ', ');

    return $options;
  }

  function options_form(&$form, &$form_state) {
    $form['type'] = array(
      '#type' => 'radios',
      '#title' => t('Display type'),
      '#options' => array(
        'ul' => t('Unordered list'),
        'ol' => t('Ordered list'),
        'separator' => t('Simple separator'),
      ),
      '#default_value' => $this->options['type'],
    );

    $form['separator'] = array(
      '#type' => 'textfield',
      '#title' => t('Separator'),
      '#default_value' => $this->options['separator'],
      '#dependency' => array('radio:options[type]' => array('separator')),
    );
    parent::options_form($form, $form_state);
  }

  function render($values) {
    $field = $this->get_value($values);
    if (!empty($this->items[$field])) {
      if ($this->options['type'] == 'separator') {
        return implode($this->sanitize_value($this->options['separator']), $this->items[$field]);
      }
      else {
        return theme('item_list',
          array(
            'items' => $this->items[$field],
            'title' => NULL,
            'type' => $this->options['type']
          ));
      }
    }
  }

  function render_items($items) {
    if (!empty($items)) {
      if ($this->options['type'] == 'separator') {
        return implode($this->sanitize_value($this->options['separator']), $items);
      }
      else {
        return theme('item_list',
          array(
            'items' => $items,
            'title' => NULL,
            'type' => $this->options['type']
          ));
      }
    }
  }

  function get_items($values) {
    // Only the parent get_value returns a single field.
    $field = parent::get_value($values);
    if (!empty($this->items[$field])) {
      return $this->items[$field];
    }

    return array();
  }

  function get_value($values, $field = NULL, $raw = FALSE) {
    if ($raw) {
      return parent::get_value($values, $field);
    }
    $item = $this->get_items($values);
    $item = (array) $item;
    if (isset($field) && isset($item[$field])) {
      return $item[$field];
    }
    return $item;
  }

  function allow_advanced_render() {
    // Note that the advanced render bits also use the presence of
    // this method to determine if it needs to render items as a list.
    return method_exists($this, 'render_item');
  }
}