Extended Content Vote Code

<?php
/**
* @version      $Revision$
* @package      Joomla
* @license      GNU/GPL, see LICENSE.php
* Joomla! is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/

// no direct access
defined('_JEXEC') or die('Restricted access');

jimport('joomla.plugin.plugin');
jimport('joomla.version');

if (!defined('PLGX_POS_BEFORECONTENT')) {
    define('PLGX_POS_BEFORECONTENT', 1);
    define('PLGX_POS_AFTERCONTENT', 2);
    define('PLGX_POS_AFTERTITLE', 3);
    define('PLGX_POS_BEFOREARTICLE', 4);
    define('PLGX_POS_AFTERHEAD', 5);
}

if (!defined('JPATH_THEMES')) define('JPATH_THEMES', JPATH_SITE.DS.'templates');

class plgContentVoteExt extends JPlugin
{
    var $pluginPath;
    var $is15;
    var $is2;
    var $resourceURI;
    var $encoding;
    var $task;
    var $xsclass;
    
    function plgContentVoteExt(&$subject, $params)
    {
        parent::__construct($subject, $params);
        $this->encoding = 'UTF-8';
        $this->pluginPath = dirname(__FILE__).DS.$this->_name;
        $this->loadLanguage();
        $version = new JVersion();
        $this->is15 = version_compare($version->RELEASE, "1.5");
        $this->is2 = version_compare($version->RELEASE, "2.0");
        $this->resourceURI = '/plugins/'.$this->_type.'/'.$this->_name.'/';
        if ($this->is2) {
            $this->resourceURI .= $this->_name.'/';
        }
        $this->task = 'vote';
        if ($this->is2) {
            $this->task = 'article.vote';
        }
        $this->xsclass = 'accessibility';
        if ($this->is2) {
            $this->xsclass = 'unseen';
        }
    }
    
    // ------------ 2.5 API ------------
    function onContentPrepare($context, &$row, &$params, $page=0)
    {
    }
    
    function onContentAfterTitle($context, &$row, &$params, $page=0)
    {
        return $this->onAfterDisplayTitle($row, $params, $page);
    }
    
    function onContentBeforeDisplay($context, &$row, &$params, $page=0)
    {
        return $this->onBeforeDisplayContent($row, $params, $page);
    }
    
    function onContentAfterDisplay($context, &$row, &$params, $page=0)
    {
        return $this->onAfterDisplayContent($row, $params, $page);
    }
    
    // ------------ 1.5 API ------------
    function onAfterDisplayTitle(&$article, &$params, $limitstart)
    {
        if (PLGX_POS_AFTERTITLE == $this->params->get('display_at', PLGX_POS_BEFORECONTENT)) {
            return $this->render($article, $params, $limitstart);
        }
        return '';
    }
    
    function onBeforeDisplayContent(&$article, &$params, $limitstart)
    {
        if (PLGX_POS_BEFORECONTENT == $this->params->get('display_at', PLGX_POS_BEFORECONTENT)) {
            return $this->render($article, $params, $limitstart);
        }
        return '';
    }
    
    function onAfterDisplayContent(&$article, &$params, $limitstart)
    {
        if (PLGX_POS_AFTERCONTENT == $this->params->get('display_at', PLGX_POS_BEFORECONTENT)) {
            return $this->render($article, $params, $limitstart);
        }
        return '';
    }
    
    /**
     * $html = current($mainframe->triggerEvent('onContentVote', array(&$this->article, &$this->params, 1)));
     * echo $html;     
     */         
    function onContentVote(&$article, &$params, $limitstart)
    {
        return $this->render($article, $params, $limitstart);
    }
    
    function render(&$row, &$params, $page=0)
    {
        $html   = '';
    
        if ($params->get('show_vote') && !$params->get('popup')) {
            if ($this->is2 && ('article' != JRequest::getString('view', '') || $row->state != 1)) {
                $params->set('intro_only', 1);
            }
            $this->uri = JFactory::getURI();
            $this->assignRef('article', $row);
            $html = $this->loadTemplate($params);
        }
        return $html;
    }
    
    function getImage($file, &$imgAttrs, $alt, $asTag = true, $useSystem = false)
    {
        if ($this->is2) {
            $attrs = '';
            if ($asTag && is_array($imgAttrs)) {
                foreach ($imgAttrs as $key => $value) {
                    if (0 < strlen($attrs)) $attrs .= ' ';
                    $attrs .= $key.'="'.htmlspecialchars($value, ENT_COMPAT, $this->encoding, false).'"';
                }
            }
            //image($file, $alt, $attribs = null, $relative = false, $path_only = false);
            return JHtml::_('image', ($useSystem ? 'system/' : $this->resourceURI) . $file, $alt, $attrs, $useSystem, !$asTag);
        }
        else if ($this->is15) {
            return JHtml::_('image.site', $file, $useSystem ? '/images/M_images/' : $this->resourceURI, NULL, '', $alt, $imgAttrs, $asTag);
        }
        return '';
    }

    function assignRef($key, &$val)
    {
        if (is_string($key) && substr($key, 0, 1) != '_')
        {
            unset($this->$key);      
            $this->$key =& $val;
            return true;
        }
        return false;
    }
    
    function loadTemplate(&$params, $name = 'default')
    {
        global $mainframe;
        if (!isset($mainframe)) {
            $mainframe = JFactory::getApplication();
        }
        $override = JPATH_THEMES.DS.$mainframe->getTemplate().DS.'html'.DS
            .'plg_'.$this->_type.'_'.$this->_name.DS.$name.'.php';
        ob_start();
        if (is_readable($override)) {
            include($override);
        }
        else {
            $override = $this->pluginPath.DS.'tmpl'.DS.$name.'.php';
            if (is_readable($override)) {
                include($override);
            }
            else {
                ob_end_clean();
                JError::raiseError(500, '['.$this->_name.'] '.JText::_('Failed to load template').' '.$name.'.php');
                return '';
            }
        }
        return ob_get_clean();
    }
}