extender-methods.php

<?php

...

public function renderSection($sectionName, $params = array())
{
    if($sectionName == 'FrontendItemDetails') {
        $this->renderFrontendItemDetails();
    } elseif($sectionName == 'FrontendCategoryList') {
        $this->renderFrontendCategoryList();
    } else {
        return parent::renderSection($sectionName, $params);
    }
}



private function renderFrontendCategoryList()
{
    $rows = '';
    $params = array(
        'section' => 'frontend',
        'selector' => 'active=1',
        'filter' =>   'group',
        'pageurl' => $this->processor->config->pageNumberParam
    );
    $result = $this->processor->getCategories($params);
    // If you want to order the categories additionally according to their position, remove next comment:
    //$result['categories'] = imanager()->getItemMapper()->filterSimpleItems('position', 'DESC', 0, 0, $result['categories']);

    if(isset($result['total']) && $result['total'] > 0 && !empty($result['categories']))
    {
        foreach($result['categories'] as $category)
        {
            if($this->processor->config->categoryImageResize)
            {
                $path = \ImCatalog\Util::getResizedUrl($category,
                    $this->processor->config->categoryImageIndex,
                    $this->processor->config->categoryImageMaxWidth,
                    $this->processor->config->categoryImageMaxHeight,
                    'resize'
                );
            } else { $path = IM_SITE_URL.$category->image[$this->processor->config->categoryImageIndex]; }

            if(empty($path))
            {
                $path = IM_SITE_URL . 'plugins/' . $this->processor->config->pluginId . '/images/thumb300x300.png';
            }

            $replace = array();
            foreach($category as $name => $value) {
                if($name == 'image') {
                    $replace[$name] = $path;
                    continue;
                }
                $replace[$name] = ($name == 'image_title') ? $value[0] : $value;
            }
            $replace['href'] = './'.$category->slug.$this->processor->config->trailingSlash;
            $replace['info_link'] = \ImCatalog\Util::i18n_r('categorylist_infolink_label');
            $replace['category_info'] =  $this->parser->render($this->categoryInfo, $replace);
            $rows .= $this->parser->render($this->categoryRow, $replace);
        }
        $this->content = $rows;
        $this->pagination = $result['pagination'];
        $this->total = $result['total'];
    }
}

...