source: extensions/pAnchor/pAnchor.php @ 8636

<?php
//pAnchor plugin code
if (!defined('PHPWG_ROOT_PATH') or !defined('PANCHOR_DIR')) die('Hacking attempt!');

function pAnchor_links($content) {
        //iterate thru navigation links and append #<PANCHOR_NAME> to URL string variable
        global $template;
        
        //picture nav buttons
        $links = array('first','previous','next','last');
        $tags = array('U_IMG');
        foreach ($links as $link) {
                $temp = $template->get_template_vars($link);
                foreach ($tags as $tag) {
                        if (isset($temp[$tag]))  {
                                $temp[$tag] .= '#'.PANCHOR_NAME;
                                $template->assign($link, $temp);
                        }
                }
        }
        
        //slideshow nav buttons
        $links = array('slideshow');
        $tags = array('U_START_PLAY', 'U_STOP_PLAY', 'U_START_REPEAT', 'U_STOP_REPEAT', 'U_DEC_PERIOD', 'U_INC_PERIOD');
        foreach ($links as $link) {
                $temp = $template->get_template_vars($link);
                foreach ($tags as $tag) {
                        if (isset($temp[$tag]))  {
                                $temp[$tag] .= '#'.PANCHOR_NAME;
                                $template->assign($link, $temp);
                        }
                }
        }
        
        //start slideshow nav button
        $temp = $template->get_template_vars('U_SLIDESHOW_START');
        if (isset($temp))  {
                $temp .= '#'.PANCHOR_NAME;
                $template->assign('U_SLIDESHOW_START', $temp);
        }
        //stop slideshow nav button
        $temp = $template->get_template_vars('U_SLIDESHOW_STOP');
        if (isset($temp))  {
                $temp .= '#'.PANCHOR_NAME;
                $template->assign('U_SLIDESHOW_STOP', $temp);
        }
        
        //assign anchor name to  template var
        $template->assign('PANCHOR_NAME', PANCHOR_NAME);
        return $content;
}       //end function pAnchor_links

function pAnchor_picture_prefilter($content, &$smarty)  {
        //add the HTML page anchor tag into picture template via search  string
        global $template;
        
        $search = '#'.PANCHOR_PICTURE_SEARCH_TAG.'#';
        $replacement = '<a id="pAnchor" name="{$PANCHOR_NAME}"></a>'.PANCHOR_PICTURE_SEARCH_TAG;
        return preg_replace($search, $replacement, $content);
}

function pAnchor_slideshow_prefilter($content, &$smarty)        {
        //add the HTML page anchor tag into slideshow template via search  string 
        global $template;
        
        $search = '#'.PANCHOR_SLIDESHOW_SEARCH_TAG.'#';
        $replacement = '<a id="pAnchor" name="{$PANCHOR_NAME}"></a>'.PANCHOR_SLIDESHOW_SEARCH_TAG;
        return preg_replace($search, $replacement, $content);
}

function pAnchor_add_anchor()   {
        //setup add anchor prefilters for picture.tpl and slideshow.tpl
        global $template;
        $template->set_prefilter('picture', 'pAnchor_picture_prefilter');
        $template->set_prefilter('slideshow', 'pAnchor_slideshow_prefilter');

}

function pAnchor_adj_meta_refresh()     {
        //adjust the <META refresh header element as this controls slideshow URL
        global $template, $page;
          
        $temp = $template->get_template_vars('page_refresh');
        if (isset($temp['U_REFRESH']))  {
                $temp['U_REFRESH'] = $temp['U_REFRESH'].'#'.PANCHOR_NAME;
                $template->assign('page_refresh', $temp);
        }
        if (isset($page['slideshow'])) {
                if ($page['slideshow']) {
                        //add CSS for  pAnchor to document head
                        $template->append('head_elements', PANCHOR_CSS_SLIDESHOW);
                        //load js for pAnchor
                } else {
                  //add CSS for  pAnchor to document head
                  $template->append('head_elements', PANCHOR_CSS_PICTURE);              
                }
        }               
        //experimental feature to auto ease scroll to pAnchor when navigating  
        //to picture or slideshow from another page (that does not have # in url)
        if ( PANCHOR_EASE_ENABLE == true) {
                $template->append('head_elements', '<script src="'.get_root_url().PANCHOR_PATH.'pAnchor.js" type="text/javascript" charset="utf-8"></script>');
        }
}
  
//do NOT add anchors on ADMIN side of piwigo
if (!defined('IN_ADMIN')) {
        add_event_handler('render_element_content', 'pAnchor_links');
        
        add_event_handler('loc_end_picture', 'pAnchor_add_anchor');
        add_event_handler('loc_end_page_header', 'pAnchor_adj_meta_refresh');
}

?>