qa-layer-voters-flaggers.php

<?php
/*
	Question2Answer by Gideon Greenspan and contributors
	http://www.question2answer.org/

	File: qa-include/qa-layer-voters-flaggers.php
	Description: Theme layer class for viewing voters and flaggers


	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	More about this license: http://www.question2answer.org/license.php
*/

class qa_html_theme_layer extends qa_html_theme_base
{
	private $qa_voters_flaggers_queue=array();
	private $qa_voters_flaggers_cache=array();


//	Utility functions for this layer

	private function queue_post_voters_flaggers($post)
	{
		if (!qa_user_post_permit_error('permit_view_voters_flaggers', $post)) {
			$postids=array(@$post['postid'], @$post['opostid']); // opostid can be relevant for flags

			foreach ($postids as $postid)
				if (isset($postid) && !isset($this->qa_voters_flaggers_cache[$postid]))
					$this->qa_voters_flaggers_queue[$postid]=true;
		}
	}

	private function queue_raw_posts_voters_flaggers($posts)
	{
		if (is_array($posts))
			foreach ($posts as $post)
				if (isset($post['raw']))
					$this->queue_post_voters_flaggers($post['raw']);
	}

	private function retrieve_queued_voters_flaggers()
	{
		if (count($this->qa_voters_flaggers_queue)) {
			require_once QA_INCLUDE_DIR.'db/votes.php';

			$postids=array_keys($this->qa_voters_flaggers_queue);

			foreach ($postids as $postid)
				$this->qa_voters_flaggers_cache[$postid]=array();

			$newvotersflaggers=qa_db_uservoteflag_posts_get($postids);

			if (QA_FINAL_EXTERNAL_USERS) {
				$keyuserids=array();
				foreach ($newvotersflaggers as $voterflagger)
					$keyuserids[$voterflagger['userid']]=true;

				$useridhandles=qa_get_public_from_userids(array_keys($keyuserids));
				foreach ($newvotersflaggers as $index => $voterflagger)
					$newvotersflaggers[$index]['handle']=@$useridhandles[$voterflagger['userid']];
			}

			foreach ($newvotersflaggers as $voterflagger)
				$this->qa_voters_flaggers_cache[$voterflagger['postid']][]=$voterflagger;

			$this->qa_voters_flaggers_queue=array();
		}
	}

	private function get_post_voters_flaggers($post, $postid)
	{
		require_once QA_INCLUDE_DIR.'util/sort.php';

		if (!isset($this->qa_voters_flaggers_cache[$postid])) {
			$this->queue_post_voters_flaggers($post);
			$this->retrieve_queued_voters_flaggers();
		}

		$votersflaggers=@$this->qa_voters_flaggers_cache[$postid];

		if (isset($votersflaggers))
			qa_sort_by($votersflaggers, 'handle');

		return $votersflaggers;
	}


//	Collect up all required postids for the entire page to save DB queries - common case where whole page output

	public function main()
	{
		foreach ($this->content as $key => $part) {
			if (strpos($key, 'q_list')===0)
				$this->queue_raw_posts_voters_flaggers(@$part['qs']);

			elseif (strpos($key, 'q_view')===0) {
				$this->queue_post_voters_flaggers($part['raw']);
				$this->queue_raw_posts_voters_flaggers($part['c_list']['cs']);

			} elseif (strpos($key, 'a_list')===0) {
				if (!empty($part)) {
					$this->queue_raw_posts_voters_flaggers($part['as']);

					foreach ($part['as'] as $a_item)
						$this->queue_raw_posts_voters_flaggers(@$a_item['c_list']['cs']);
				}
			}
		}

		qa_html_theme_base::main();
	}


//	Other functions which also collect up required postids for lists to save DB queries - helps with widget output and Ajax calls

	public function q_list_items($q_items)
	{
		$this->queue_raw_posts_voters_flaggers($q_items);

		qa_html_theme_base::q_list_items($q_items);
	}

	public function a_list_items($a_items)
	{
		$this->queue_raw_posts_voters_flaggers($a_items);

		qa_html_theme_base::a_list_items($a_items);
	}

	public function c_list_items($c_items)
	{
		$this->queue_raw_posts_voters_flaggers($c_items);

		qa_html_theme_base::c_list_items($c_items);
	}


//	Actual output of the voters and flaggers

	public function vote_count($post)
	{
		$votersflaggers=$this->get_post_voters_flaggers($post['raw'], @$post['vote_opostid'] ? $post['raw']['opostid'] : $post['raw']['postid']);

		$tooltip='';

		if (isset($votersflaggers)) {
			$uphandles='';
			$downhandles='';

			foreach ($votersflaggers as $voterflagger) {
				if ($voterflagger['vote']>0)
					$uphandles.=(strlen($uphandles) ? ', ' : '').qa_html($voterflagger['handle']);

				if ($voterflagger['vote']<0)
					$downhandles.=(strlen($downhandles) ? ', ' : '').qa_html($voterflagger['handle']);

				$tooltip=trim((strlen($uphandles) ? ('&uarr; '.$uphandles) : '')."\n\n".(strlen($downhandles) ? ('&darr; '.$downhandles) : ''));
			}
		}

		$post['vote_count_tags']=@$post['vote_count_tags'].' title="'.$tooltip.'"';

		qa_html_theme_base::vote_count($post);
	}

	public function post_meta_flags($post, $class)
	{
		$postid=@$post['raw']['opostid'];
		if (!isset($postid))
			$postid=@$post['raw']['postid'];

		$tooltip='';

		if (isset($postid)) {
			$votersflaggers=$this->get_post_voters_flaggers($post, $postid);

			if (isset($votersflaggers))
				foreach ($votersflaggers as $voterflagger)
					if ($voterflagger['flag']>0)
						$tooltip.=(strlen($tooltip) ? ', ' : '').qa_html($voterflagger['handle']);
		}

		if (strlen($tooltip))
			$this->output('<span title="&#9873; '.$tooltip.'">');

		qa_html_theme_base::post_meta_flags($post, $class);

		if (strlen($tooltip))
			$this->output('</span>');
	}
}