class views_plugin_row

class views_plugin_row extends views_plugin {
    
    /**
     * {@inheritdoc}
     */
    public function init(&$view, &$display, $options = NULL) {
        $this->view =& $view;
        $this->display =& $display;
        // Overlay incoming options on top of defaults.
        $this->unpack_options($this->options, isset($options) ? $options : $display->handler
            ->get_option('row_options'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function uses_fields() {
        return !empty($this->definition['uses fields']);
    }
    
    /**
     * {@inheritdoc}
     */
    public function option_definition() {
        $options = parent::option_definition();
        if (isset($this->base_table)) {
            $options['relationship'] = array(
                'default' => 'none',
            );
        }
        return $options;
    }
    
    /**
     * Provide a form for setting options.
     */
    public function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);
        if (isset($this->base_table)) {
            $view =& $form_state['view'];
            // A whole bunch of code to figure out what relationships are valid for
            // this item.
            $relationships = $view->display_handler
                ->get_option('relationships');
            $relationship_options = array();
            foreach ($relationships as $relationship) {
                $relationship_handler = views_get_handler($relationship['table'], $relationship['field'], 'relationship');
                // If this relationship is valid for this type, add it to the list.
                $data = views_fetch_data($relationship['table']);
                $base = $data[$relationship['field']]['relationship']['base'];
                if ($base == $this->base_table) {
                    $relationship_handler->init($view, $relationship);
                    $relationship_options[$relationship['id']] = $relationship_handler->label();
                }
            }
            if (!empty($relationship_options)) {
                $relationship_options = array_merge(array(
                    'none' => t('Do not use a relationship'),
                ), $relationship_options);
                $rel = empty($this->options['relationship']) ? 'none' : $this->options['relationship'];
                if (empty($relationship_options[$rel])) {
                    // Pick the first relationship.
                    $rel = key($relationship_options);
                }
                $form['relationship'] = array(
                    '#type' => 'select',
                    '#title' => t('Relationship'),
                    '#options' => $relationship_options,
                    '#default_value' => $rel,
                );
            }
            else {
                $form['relationship'] = array(
                    '#type' => 'value',
                    '#value' => 'none',
                );
            }
        }
    }
    
    /**
     * Validate the options form.
     */
    public function options_validate(&$form, &$form_state) {
    }
    
    /**
     * Perform any necessary changes to the form values prior to storage.
     * There is no need for this function to actually store the data.
     */
    public function options_submit(&$form, &$form_state) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        if (isset($this->base_table)) {
            if (isset($this->options['relationship']) && isset($this->view->relationship[$this->options['relationship']])) {
                $relationship = $this->view->relationship[$this->options['relationship']];
                $this->field_alias = $this->view->query
                    ->add_field($relationship->alias, $this->base_field);
            }
            else {
                $this->field_alias = $this->view->query
                    ->add_field($this->base_table, $this->base_field);
            }
        }
    }
    
    /**
     * Allow the style to do stuff before each row is rendered.
     *
     * @param array $result
     *   The full array of results from the query.
     */
    public function pre_render($result) {
    }
    
    /**
     * Render a row object. This usually passes through to a theme template
     * of some form, but not always.
     *
     * @param stdClass $row
     *   A single row of the query result, so an element of $view->result.
     *
     * @return string
     *   The rendered output of a single row, used by the style plugin.
     */
    public function render($row) {
        return theme($this->theme_functions(), array(
            'view' => $this->view,
            'options' => $this->options,
            'row' => $row,
            'field_alias' => isset($this->field_alias) ? $this->field_alias : '',
        ));
    }

}