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   1  <?php
   2  /**
   3   * Argument handler that ignores the argument.
   4   */
   5  class views_handler_argument_null extends views_handler_argument {
   6    function option_definition() {
   7      $options = parent::option_definition();
   8      $options['must_not_be'] = array('default' => FALSE);
   9      return $options;
  10    }
  11  
  12    /**
  13     * Override options_form() so that only the relevant options
  14     * are displayed to the user.
  15     */
  16    function options_form(&$form, &$form_state) {
  17      parent::options_form($form, $form_state);
  18      $form['must_not_be'] = array(
  19        '#type' => 'checkbox',
  20        '#title' => t('Fail basic validation if any argument is given'),
  21        '#default_value' => !empty($this->options['must_not_be']),
  22        '#description' => t('By checking this field, you can use this to make sure views with more arguments than necessary fail validation.'),
  23      );
  24  
  25      unset($form['wildcard']);
  26      unset($form['wildcard_substitution']);
  27    }
  28  
  29    /**
  30     * Override default_actions() to remove actions that don't
  31     * make sense for a null argument.
  32     */
  33    function default_actions($which = NULL) {
  34      if ($which) {
  35        if (in_array($which, array('ignore', 'not found', 'empty', 'default'))) {
  36          return parent::default_actions($which);
  37        }
  38        return;
  39      }
  40      $actions = parent::default_actions();
  41      unset($actions['summary asc']);
  42      unset($actions['summary desc']);
  43      return $actions;
  44    }
  45  
  46    function validate_argument_basic($arg) {
  47      if (!empty($this->options['must_not_be'])) {
  48        return !isset($arg);
  49      }
  50  
  51      return parent::validate_argument_basic($arg);
  52    }
  53  
  54    /**
  55     * Override the behavior of query() to prevent the query
  56     * from being changed in any way.
  57     */
  58    function query() {}
  59  }